The document discusses the steps involved in modern vaccine production. It begins by outlining the process of selecting a strain for vaccine production, including killing or inactivating the organism. It then discusses formulation of the vaccine by suspending the microorganism in fluids, preservatives, and adjuvants. The final stages involve quality control testing, including sterility, safety, and efficacy testing before batch release and distribution.
This document discusses subunit and peptide vaccines. Subunit vaccines contain purified antigens from pathogens rather than whole pathogens. They often require adjuvants and multiple doses to provide long-lasting immunity. Peptide vaccines use short amino acid sequences from pathogens to stimulate immune responses. While they are stable and inexpensive to produce, peptides may not stimulate T-cells on their own and require carriers or adjuvants. The document outlines advantages and disadvantages of both subunit and peptide vaccines.
Peptide vaccine containing only epitopes capable of inducing positive, desirable T cell and B cell mediated immune response.
Peptides‖ used in these vaccines are 20–30 amino acid sequences that are synthesized to form an immunogenic peptide molecule representing the specific epitope of an antigen.
sufficient for activation of the appropriate cellular and humoral responses
Eliminating allergenic and/or reactogenic responses.
vaccine is a biological preparation that provides active acquired immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and to further recognize and destroy any of the microorganisms associated with that agent that it may encounter in the future.
HISTORY OF VACCINES-
EDWARD JENNER conduct experiments in 1796 that lead to the creation of the first smallpox vaccine for prevention of smallpox.
A vaccine for RABIES is developed by LOUIS PASTEUR .
Vaccine for COLERA and TYPHOID were developed in 1896 and PLAGE vaccine in 1887.
The first DIPHTHERIA vaccine is developed in about 1913 by EMIL ADOLPH BEHRING,WILLIAM HALLOCK PARK.
The whole cell PERTUSIS vaccines are developed in 1914.
A TETANUS vaccine is developed in 1927.
DNA vaccines work by injecting genetically engineered DNA that causes host cells to produce antigens, which stimulate the immune system. They have several advantages over traditional vaccines, including lower risk and ability to induce both antibody and T cell responses. DNA vaccines are made by inserting antigen-encoding genes into bacterial plasmids, amplifying the plasmids in bacteria, purifying the DNA, and then injecting it intramuscularly or using a gene gun. The DNA is taken up by host cells and expressed as antigens, which are processed and presented to induce cytotoxic T cells and antibody production against the target pathogen. Future improvements may enhance DNA uptake and expression to improve immune responses.
Recombinant vaccines use genetic engineering techniques to produce antigens that induce protective immunity. They offer advantages over conventional vaccines like improved safety and defined composition. Recombinant vaccines work by inserting genes for antigens into vectors like viruses. This allows the vector to produce the antigen and elicit an immune response. They can target specific cells and induce immunity through multiple routes of administration. While live recombinant vaccines carry a risk of reversion, they elicit strong immune responses from just one or a few doses. Future areas of development include improved delivery methods and use of immunomodulators and plant expression systems.
This document presents information on vector vaccines. It defines vector vaccines as using live, attenuated microorganisms like viruses or bacteria that have been genetically modified to express antigens from pathogenic organisms. This allows the vector to act as an antigen delivery system, stimulating an immune response against the pathogen. Common viral vectors discussed are vaccinia virus and adenovirus, while bacterial vectors include attenuated Salmonella. The document outlines the process of producing a vaccinia vector vaccine and discusses advantages like strong immunogenicity and ability to induce different types of immune responses. However, it also notes disadvantages such as high production costs and safety concerns in immunocompromised individuals.
Haptens are small molecules that are antigenic but not immunogenic on their own. They are unable to induce an immune response because they cannot activate helper T cells due to their inability to bind MHC proteins or activate B cells directly as they are univalent. However, when haptens are covalently bound to a carrier protein, they form immunogenic conjugates that can induce an immune response by activating helper T cells and B cells. Pioneering work by Karl Landsteiner demonstrated that antibodies produced against hapten-carrier conjugates were specific for the hapten and carrier epitopes. Common examples of haptens include drug molecules, peptides, and steroids. Hapten-protein conjugates can cause drug
Viruses can be used to deliver genetic material into target cells. Viruses are composed of genetic material encapsulated in a protein coat. They inject their DNA into target cells, and the viral DNA can be altered to contain a gene of interest. This allows the gene of interest to be delivered into the target cell without producing new viral particles. Adenoviruses are non-enveloped DNA viruses that can infect both dividing and non-dividing cells. They are used as vectors for gene delivery by deleting early genes and adding the gene of interest.
This document discusses subunit and peptide vaccines. Subunit vaccines contain purified antigens from pathogens rather than whole pathogens. They often require adjuvants and multiple doses to provide long-lasting immunity. Peptide vaccines use short amino acid sequences from pathogens to stimulate immune responses. While they are stable and inexpensive to produce, peptides may not stimulate T-cells on their own and require carriers or adjuvants. The document outlines advantages and disadvantages of both subunit and peptide vaccines.
Peptide vaccine containing only epitopes capable of inducing positive, desirable T cell and B cell mediated immune response.
Peptides‖ used in these vaccines are 20–30 amino acid sequences that are synthesized to form an immunogenic peptide molecule representing the specific epitope of an antigen.
sufficient for activation of the appropriate cellular and humoral responses
Eliminating allergenic and/or reactogenic responses.
vaccine is a biological preparation that provides active acquired immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and to further recognize and destroy any of the microorganisms associated with that agent that it may encounter in the future.
HISTORY OF VACCINES-
EDWARD JENNER conduct experiments in 1796 that lead to the creation of the first smallpox vaccine for prevention of smallpox.
A vaccine for RABIES is developed by LOUIS PASTEUR .
Vaccine for COLERA and TYPHOID were developed in 1896 and PLAGE vaccine in 1887.
The first DIPHTHERIA vaccine is developed in about 1913 by EMIL ADOLPH BEHRING,WILLIAM HALLOCK PARK.
The whole cell PERTUSIS vaccines are developed in 1914.
A TETANUS vaccine is developed in 1927.
DNA vaccines work by injecting genetically engineered DNA that causes host cells to produce antigens, which stimulate the immune system. They have several advantages over traditional vaccines, including lower risk and ability to induce both antibody and T cell responses. DNA vaccines are made by inserting antigen-encoding genes into bacterial plasmids, amplifying the plasmids in bacteria, purifying the DNA, and then injecting it intramuscularly or using a gene gun. The DNA is taken up by host cells and expressed as antigens, which are processed and presented to induce cytotoxic T cells and antibody production against the target pathogen. Future improvements may enhance DNA uptake and expression to improve immune responses.
Recombinant vaccines use genetic engineering techniques to produce antigens that induce protective immunity. They offer advantages over conventional vaccines like improved safety and defined composition. Recombinant vaccines work by inserting genes for antigens into vectors like viruses. This allows the vector to produce the antigen and elicit an immune response. They can target specific cells and induce immunity through multiple routes of administration. While live recombinant vaccines carry a risk of reversion, they elicit strong immune responses from just one or a few doses. Future areas of development include improved delivery methods and use of immunomodulators and plant expression systems.
This document presents information on vector vaccines. It defines vector vaccines as using live, attenuated microorganisms like viruses or bacteria that have been genetically modified to express antigens from pathogenic organisms. This allows the vector to act as an antigen delivery system, stimulating an immune response against the pathogen. Common viral vectors discussed are vaccinia virus and adenovirus, while bacterial vectors include attenuated Salmonella. The document outlines the process of producing a vaccinia vector vaccine and discusses advantages like strong immunogenicity and ability to induce different types of immune responses. However, it also notes disadvantages such as high production costs and safety concerns in immunocompromised individuals.
Haptens are small molecules that are antigenic but not immunogenic on their own. They are unable to induce an immune response because they cannot activate helper T cells due to their inability to bind MHC proteins or activate B cells directly as they are univalent. However, when haptens are covalently bound to a carrier protein, they form immunogenic conjugates that can induce an immune response by activating helper T cells and B cells. Pioneering work by Karl Landsteiner demonstrated that antibodies produced against hapten-carrier conjugates were specific for the hapten and carrier epitopes. Common examples of haptens include drug molecules, peptides, and steroids. Hapten-protein conjugates can cause drug
Viruses can be used to deliver genetic material into target cells. Viruses are composed of genetic material encapsulated in a protein coat. They inject their DNA into target cells, and the viral DNA can be altered to contain a gene of interest. This allows the gene of interest to be delivered into the target cell without producing new viral particles. Adenoviruses are non-enveloped DNA viruses that can infect both dividing and non-dividing cells. They are used as vectors for gene delivery by deleting early genes and adding the gene of interest.
This document discusses different types of vaccines including synthetic peptide vaccines, recombinant antigen vaccines, and vector vaccines. Synthetic peptide vaccines use short peptide fragments to induce an immune response. Recombinant antigen vaccines produce antigens using DNA technology by inserting genes into host cells. Vector vaccines use non-pathogenic viruses or bacteria as vectors to deliver genes encoding antigens to stimulate immunity. Examples of extensively used viral vectors include vaccinia virus and adenovirus. Two vector vaccines are being developed against coronaviruses by using different viral vectors to deliver spike and nucleocapsid proteins.
DNA vaccines work by injecting DNA encoding antigens from pathogens. The host cells use this DNA to produce antigens, which are then displayed on the cell surface and trigger both humoral and cellular immune responses. DNA vaccines offer advantages over traditional vaccines like avoiding infectious organisms, not requiring refrigeration, and stimulating both arms of the immune system. They have shown protection against diseases in animal studies and have potential applications for influenza, hepatitis B, HIV, and malaria vaccines. However, DNA vaccines also have disadvantages like weak immune responses in humans.
There are 5 major antibody isotypes - IgM, IgD, IgG, IgE, and IgA - which differ based on their heavy chain. The heavy chain determines the isotype and can be mu, delta, gamma, epsilon, or alpha. Light chains can be either kappa or lambda with any isotype. IgG is the most abundant in humans while IgE is the least. Isotypes are located in the constant region of the heavy and light chains. Allotypes are specified by allelic forms of immunoglobulin genes and are also in the constant regions. Idiotypes are unique epitopes located in the variable regions of individual antibody molecules.
This presentation covers a general introduction to expression vector, its components, types, and its application. Then it covers some of the expression system with examples.
This document discusses monoclonal and polyclonal antibodies, including their production and uses. Monoclonal antibodies are produced from a single clone and recognize a single epitope, while polyclonal antibodies recognize multiple epitopes of an antigen. Monoclonal antibodies are produced via cell fusion and screening of hybridomas, while polyclonal antibodies are produced by injecting animals with antigens to elicit an immune response. Both have advantages and disadvantages for diagnostic and therapeutic applications.
Vaccines, types of vaccines, Classification of vaccines, subunit vaccines, attenuated vaccines, live vaccines, inactivated vaccines, recombinant vaccines, DNA vaccines, development of vaccines, future of vaccines, advantages of vaccines, limitation of vaccines, benefits of vaccines.
Developing vaccines against infectious and epidemic diseases with the aid of Bioinformatics is now possible, by predicting epitopes on an antigen and finding possible targets for the antibody to bind. A new era of vaccine production is just ahead of us.
Watch out the ppt to know more!!!
The document outlines the immune response to viral infections. It discusses that viruses are obligate intracellular parasites that cannot replicate without hijacking a host cell. The innate immune response includes epithelial barriers, interferons like IFN-α and IFN-β, natural killer cells, and macrophages. Adaptive responses involve antiviral antibodies that can neutralize viruses or mediate antibody-dependent cellular cytotoxicity, as well as cytotoxic T lymphocytes that identify and kill infected cells. Overall, the immune system employs diverse innate and adaptive mechanisms to recognize, control and clear viral infections.
This presentation contains 53 power point slides. These slides have description between virus and host cell interactions including concept of permissive and non-permissive infection, latent infection and host immune response to viral infection. Slides are designed for medical students, nurses, academicians who are teaching virology and microbiology in medical universities, schools or college.
This document discusses the different types of immune cells. It describes lymphocytes including B cells, T cells, and natural killer cells. It also discusses mononuclear phagocytes such as monocytes and macrophages. Granulocytic cells including neutrophils, eosinophils, and basophils are also covered. The document concludes by briefly mentioning mast cells, dendritic cells, and follicular dendritic cells.
Sheep named Dolly was cloned by transfer of a nucleus from a mammary (Udder) cell of an adult sheep into an egg cell.
mammary cell
Nucleus
insert into
a egg cell
First demonstration of pluripotency (totipotency) of a nucleus of a differentiated adult cell.
Cloning of dolly somatic cell nuclei
clone cattle, sheep, goats, pigs.
nuclear transfer procedures are similar.
Adult donor cells from a variety of cell types(mammary epithelial and ovarian cells, fibroblasts, lymphocytes) are isolated
Cultured and genetically modified methods.
individual donor cells are fused to an enucleated oocyte with short-duration electric pulse.
eg: two 2.5 kilovolt /cm pulses for 10microseconds
Used to fuse adult cattle fibroblasts with enucleated oocytes.
The pulses simultaneously induce cell fusion and oocyte activation.
Blastocyst stage before transferred into the uterus of a pseudopregant female.
Confirmed transgene at the time of birth
Surviving animals produced by nuclear transfer are healthy.
There, is a substantial loss of individual before and after birth some of the cloned animals display abnormalities.
Abnormlities such as increased birth weight.
Dna methylation and histone modification of the original donor cell is inappropriate maintained in the cells of the recipient animals.
This document presents information on recombinant vaccines. It begins by listing WHO's top disease priorities and providing brief histories of pandemics. It then discusses traditional vaccine limitations and introduces recombinant vaccines as a safer and more effective alternative. The document explains the production of subunit, DNA, conjugate, and edible recombinant vaccines. It highlights DNA vaccines' ability to induce both humoral and cellular immunity through prolonged antigen expression. In closing, it notes recombinant vaccines currently in development and trials for diseases like cancer, malaria, and Ebola.
Immune responses to infectious diseases Hadia Azhar
The document summarizes resistance and immune responses to infectious diseases. It discusses the four main types of pathogens (viruses, bacteria, protozoa, helminths) and provides details on immune responses to specific pathogens like influenza virus, diphtheria bacteria, malaria protozoa (Plasmodium), and parasitic worms. It also notes that microbes have evolved ways to evade the immune system, such as antigenic variation, hiding in protected niches, and suppressing immune responses.
It includes general introduction to antibodies; Monoclonal antibodies; comparison between Polyclonal & Monoclonal antibodies; Hybridoma Technology & Hyridoma Selection; advantages & disadvantages of mABs; Applications of mABs; Recombinant Monoclonal antibodies production through Antibody Engineering.
This document discusses different types of vaccines and how they work. It describes passive immunization which transfers preformed antibodies, and active immunization which induces the immune system to produce its own antibodies. The main types of vaccines are listed as live-attenuated, inactivated, recombinant subunit, toxoid, conjugate polysaccharide-protein, and DNA vaccines. Each works in a different way, such as using live but weakened pathogens, killed pathogens, isolated proteins or toxins, or plasmid DNA, to elicit protective immunity against diseases.
This document discusses cell culture contamination, including sources, types, signs, and methods for monitoring and preventing contamination. Common sources of contamination include failed sterilization of equipment, airborne particulates, and poorly maintained incubators. Major types of microbial contaminants are bacteria, molds, mycoplasma, yeasts, and viruses. Signs of contamination vary but may include cloudy cultures, pH changes, and visible microbes under a microscope. Proper aseptic technique and regular monitoring of cell cultures can help reduce contamination. Cross-contamination between cell lines must also be avoided.
SYNTHETIC PEPTIDE VACCINES AND RECOMBINANT ANTIGEN VACCINED.R. Chandravanshi
This document discusses synthetic peptide vaccines and recombinant antigen vaccines. It begins with definitions of vaccines and how they work to induce an immune response. It then describes two types of modern vaccines: synthetic peptide vaccines and recombinant antigen vaccines. Synthetic peptide vaccines use short fragments of viral or bacterial proteins that contain epitopes to induce an immune response, while recombinant antigen vaccines produce antigens through DNA technology by inserting viral or bacterial DNA into cells that then express the antigen protein. Both types of modern vaccines offer advantages over traditional vaccines like easier production and stability without refrigeration.
This document discusses virus isolation and cultivation. It explains that viruses require living cells to replicate and the primary purposes of cultivation are to isolate viruses from clinical samples, conduct research, and produce vaccines. Viruses can be cultivated in experimental animals, embryonated eggs, or tissue culture. Tissue culture is now most commonly used and involves growing viruses in primary cells, diploid cell strains, or continuous cell lines. The document describes different tissue culture methods and how viral growth can be detected using cytopathic effects, hemadsorption, interference, transformation, and microscopy.
This document discusses various methods for improving microbial strains, including selecting naturally occurring variants, manipulating existing genetics, and introducing new genetics. It focuses on mutation and selection techniques like chemical or UV mutagenesis followed by selection on selective media. Genetic engineering techniques are also summarized, including restriction digestion, ligation into vectors, transformation, and screening of recombinants. Common vectors like pBR322, pUC18, phages like M13, and cosmids are described. The overall goal is to outline strategies for isolating industrially useful microbial mutants.
The document describes the hybridoma technique for producing monoclonal antibodies. It involves immunizing an animal with an antigen, fusing the animal's antibody-producing B cells with myeloma cells to create hybridomas, and using HAT selection medium to select hybridomas that produce the desired monoclonal antibody. The hybridomas are then screened using ELISA or radioimmunoassay to identify clones that secrete antibodies targeting the specific antigen. Clones that test positive can then be cloned using limiting dilution or soft agar methods to generate stable monoclonal antibody-producing cell lines. Monoclonal antibodies have various applications in areas like diagnostics, imaging, pregnancy testing, and organ transplantation.
This document discusses different types of vaccines including synthetic peptide vaccines, recombinant antigen vaccines, and vector vaccines. Synthetic peptide vaccines use short peptide fragments to induce an immune response. Recombinant antigen vaccines produce antigens using DNA technology by inserting genes into host cells. Vector vaccines use non-pathogenic viruses or bacteria as vectors to deliver genes encoding antigens to stimulate immunity. Examples of extensively used viral vectors include vaccinia virus and adenovirus. Two vector vaccines are being developed against coronaviruses by using different viral vectors to deliver spike and nucleocapsid proteins.
DNA vaccines work by injecting DNA encoding antigens from pathogens. The host cells use this DNA to produce antigens, which are then displayed on the cell surface and trigger both humoral and cellular immune responses. DNA vaccines offer advantages over traditional vaccines like avoiding infectious organisms, not requiring refrigeration, and stimulating both arms of the immune system. They have shown protection against diseases in animal studies and have potential applications for influenza, hepatitis B, HIV, and malaria vaccines. However, DNA vaccines also have disadvantages like weak immune responses in humans.
There are 5 major antibody isotypes - IgM, IgD, IgG, IgE, and IgA - which differ based on their heavy chain. The heavy chain determines the isotype and can be mu, delta, gamma, epsilon, or alpha. Light chains can be either kappa or lambda with any isotype. IgG is the most abundant in humans while IgE is the least. Isotypes are located in the constant region of the heavy and light chains. Allotypes are specified by allelic forms of immunoglobulin genes and are also in the constant regions. Idiotypes are unique epitopes located in the variable regions of individual antibody molecules.
This presentation covers a general introduction to expression vector, its components, types, and its application. Then it covers some of the expression system with examples.
This document discusses monoclonal and polyclonal antibodies, including their production and uses. Monoclonal antibodies are produced from a single clone and recognize a single epitope, while polyclonal antibodies recognize multiple epitopes of an antigen. Monoclonal antibodies are produced via cell fusion and screening of hybridomas, while polyclonal antibodies are produced by injecting animals with antigens to elicit an immune response. Both have advantages and disadvantages for diagnostic and therapeutic applications.
Vaccines, types of vaccines, Classification of vaccines, subunit vaccines, attenuated vaccines, live vaccines, inactivated vaccines, recombinant vaccines, DNA vaccines, development of vaccines, future of vaccines, advantages of vaccines, limitation of vaccines, benefits of vaccines.
Developing vaccines against infectious and epidemic diseases with the aid of Bioinformatics is now possible, by predicting epitopes on an antigen and finding possible targets for the antibody to bind. A new era of vaccine production is just ahead of us.
Watch out the ppt to know more!!!
The document outlines the immune response to viral infections. It discusses that viruses are obligate intracellular parasites that cannot replicate without hijacking a host cell. The innate immune response includes epithelial barriers, interferons like IFN-α and IFN-β, natural killer cells, and macrophages. Adaptive responses involve antiviral antibodies that can neutralize viruses or mediate antibody-dependent cellular cytotoxicity, as well as cytotoxic T lymphocytes that identify and kill infected cells. Overall, the immune system employs diverse innate and adaptive mechanisms to recognize, control and clear viral infections.
This presentation contains 53 power point slides. These slides have description between virus and host cell interactions including concept of permissive and non-permissive infection, latent infection and host immune response to viral infection. Slides are designed for medical students, nurses, academicians who are teaching virology and microbiology in medical universities, schools or college.
This document discusses the different types of immune cells. It describes lymphocytes including B cells, T cells, and natural killer cells. It also discusses mononuclear phagocytes such as monocytes and macrophages. Granulocytic cells including neutrophils, eosinophils, and basophils are also covered. The document concludes by briefly mentioning mast cells, dendritic cells, and follicular dendritic cells.
Sheep named Dolly was cloned by transfer of a nucleus from a mammary (Udder) cell of an adult sheep into an egg cell.
mammary cell
Nucleus
insert into
a egg cell
First demonstration of pluripotency (totipotency) of a nucleus of a differentiated adult cell.
Cloning of dolly somatic cell nuclei
clone cattle, sheep, goats, pigs.
nuclear transfer procedures are similar.
Adult donor cells from a variety of cell types(mammary epithelial and ovarian cells, fibroblasts, lymphocytes) are isolated
Cultured and genetically modified methods.
individual donor cells are fused to an enucleated oocyte with short-duration electric pulse.
eg: two 2.5 kilovolt /cm pulses for 10microseconds
Used to fuse adult cattle fibroblasts with enucleated oocytes.
The pulses simultaneously induce cell fusion and oocyte activation.
Blastocyst stage before transferred into the uterus of a pseudopregant female.
Confirmed transgene at the time of birth
Surviving animals produced by nuclear transfer are healthy.
There, is a substantial loss of individual before and after birth some of the cloned animals display abnormalities.
Abnormlities such as increased birth weight.
Dna methylation and histone modification of the original donor cell is inappropriate maintained in the cells of the recipient animals.
This document presents information on recombinant vaccines. It begins by listing WHO's top disease priorities and providing brief histories of pandemics. It then discusses traditional vaccine limitations and introduces recombinant vaccines as a safer and more effective alternative. The document explains the production of subunit, DNA, conjugate, and edible recombinant vaccines. It highlights DNA vaccines' ability to induce both humoral and cellular immunity through prolonged antigen expression. In closing, it notes recombinant vaccines currently in development and trials for diseases like cancer, malaria, and Ebola.
Immune responses to infectious diseases Hadia Azhar
The document summarizes resistance and immune responses to infectious diseases. It discusses the four main types of pathogens (viruses, bacteria, protozoa, helminths) and provides details on immune responses to specific pathogens like influenza virus, diphtheria bacteria, malaria protozoa (Plasmodium), and parasitic worms. It also notes that microbes have evolved ways to evade the immune system, such as antigenic variation, hiding in protected niches, and suppressing immune responses.
It includes general introduction to antibodies; Monoclonal antibodies; comparison between Polyclonal & Monoclonal antibodies; Hybridoma Technology & Hyridoma Selection; advantages & disadvantages of mABs; Applications of mABs; Recombinant Monoclonal antibodies production through Antibody Engineering.
This document discusses different types of vaccines and how they work. It describes passive immunization which transfers preformed antibodies, and active immunization which induces the immune system to produce its own antibodies. The main types of vaccines are listed as live-attenuated, inactivated, recombinant subunit, toxoid, conjugate polysaccharide-protein, and DNA vaccines. Each works in a different way, such as using live but weakened pathogens, killed pathogens, isolated proteins or toxins, or plasmid DNA, to elicit protective immunity against diseases.
This document discusses cell culture contamination, including sources, types, signs, and methods for monitoring and preventing contamination. Common sources of contamination include failed sterilization of equipment, airborne particulates, and poorly maintained incubators. Major types of microbial contaminants are bacteria, molds, mycoplasma, yeasts, and viruses. Signs of contamination vary but may include cloudy cultures, pH changes, and visible microbes under a microscope. Proper aseptic technique and regular monitoring of cell cultures can help reduce contamination. Cross-contamination between cell lines must also be avoided.
SYNTHETIC PEPTIDE VACCINES AND RECOMBINANT ANTIGEN VACCINED.R. Chandravanshi
This document discusses synthetic peptide vaccines and recombinant antigen vaccines. It begins with definitions of vaccines and how they work to induce an immune response. It then describes two types of modern vaccines: synthetic peptide vaccines and recombinant antigen vaccines. Synthetic peptide vaccines use short fragments of viral or bacterial proteins that contain epitopes to induce an immune response, while recombinant antigen vaccines produce antigens through DNA technology by inserting viral or bacterial DNA into cells that then express the antigen protein. Both types of modern vaccines offer advantages over traditional vaccines like easier production and stability without refrigeration.
This document discusses virus isolation and cultivation. It explains that viruses require living cells to replicate and the primary purposes of cultivation are to isolate viruses from clinical samples, conduct research, and produce vaccines. Viruses can be cultivated in experimental animals, embryonated eggs, or tissue culture. Tissue culture is now most commonly used and involves growing viruses in primary cells, diploid cell strains, or continuous cell lines. The document describes different tissue culture methods and how viral growth can be detected using cytopathic effects, hemadsorption, interference, transformation, and microscopy.
This document discusses various methods for improving microbial strains, including selecting naturally occurring variants, manipulating existing genetics, and introducing new genetics. It focuses on mutation and selection techniques like chemical or UV mutagenesis followed by selection on selective media. Genetic engineering techniques are also summarized, including restriction digestion, ligation into vectors, transformation, and screening of recombinants. Common vectors like pBR322, pUC18, phages like M13, and cosmids are described. The overall goal is to outline strategies for isolating industrially useful microbial mutants.
The document describes the hybridoma technique for producing monoclonal antibodies. It involves immunizing an animal with an antigen, fusing the animal's antibody-producing B cells with myeloma cells to create hybridomas, and using HAT selection medium to select hybridomas that produce the desired monoclonal antibody. The hybridomas are then screened using ELISA or radioimmunoassay to identify clones that secrete antibodies targeting the specific antigen. Clones that test positive can then be cloned using limiting dilution or soft agar methods to generate stable monoclonal antibody-producing cell lines. Monoclonal antibodies have various applications in areas like diagnostics, imaging, pregnancy testing, and organ transplantation.
Hybridoma Technology ( Production , Purification , and Application ) Sakshi Ghasle
Hybridoma technology revolutionized the field of immunology by enabling the production of monoclonal antibodies with high specificity and affinity. This presentation delves into the principles of DNA hybridoma technology, highlighting its significance in antibody production, therapeutic applications, and biomedical research. Learn about the key steps involved in generating hybridomas, from immunization to antibody screening, and discover the potential of recombinant DNA techniques in enhancing antibody engineering. Whether you're a student, researcher, or industry professional, this overview will provide valuable insights into the innovative world of hybridoma technology."
Uncover the wide-ranging applications of monoclonal antibodies in areas such as cancer therapy, autoimmune diseases, infectious diseases, and beyond. Learn about the latest advancements in antibody engineering and the development of novel therapeutic modalities, including bispecific antibodies, antibody-drug conjugates, and immune checkpoint inhibitors.
Whether you're a seasoned researcher or a newcomer to the field, this SlideShare presentation serves as a valuable resource for understanding the principles, techniques, and applications of hybridoma technology in modern biomedicine. Join a journey through the fascinating world of monoclonal antibodies and the groundbreaking science behind their creation.
Unlock the potential of hybridoma technology and propel your research to new heights. Dive into this SlideShare presentation now and explore the limitless possibilities of monoclonal antibody production with hybridoma technology.
Vaccines improve immunity to diseases. Single shot vaccines provide protection against 4-6 diseases with a single injection using microspheres to encapsulate antigens and provide delayed release for booster immunization. They are more economical and convenient than traditional multi-dose vaccines. However, single shot vaccines may be less effective than multi-dose vaccines and carry risks of stimulating the immune system or causing illness from live components.
Western blotting is a technique used to detect specific proteins in a sample. It involves separating proteins by electrophoresis, transferring them to a membrane, and using antibodies to identify a target protein based on its molecular weight and signal intensity. Key steps include sample preparation, electrophoresis to separate proteins by size, electrotransfer to a membrane, blocking to reduce background noise, probing with primary and secondary antibodies, washing, and detection of the target protein. The technique allows identification and quantification of proteins but has limitations related to its qualitative nature and specificity of antibodies used.
The document discusses biotechnological product development, concepts, and technologies. It begins with definitions of biotechnology and biotechnological drugs. It then covers the history of biotechnology, examples of biotechnological drugs, routes of administration, and the process of developing biotechnological drugs. This includes techniques such as isolating genes of interest, transferring genes to expression vectors, growing host cells, purifying and formulating proteins. The document also discusses monoclonal antibody production, gene therapy, issues with biotech products, and applications of biotechnological drugs.
This document discusses monoclonal antibodies (mAbs), including their definition, production process, structure, applications, and limitations. It describes how mAbs are produced through the fusion of immune spleen cells from immunized mice with myeloma cells, which results in hybridoma cells that can produce identical antibodies. The key steps involved are immunizing mice, screening for antibody production, preparing myeloma cells, fusing cells, cloning hybridomas, and selecting cells in HAT medium. mAbs have various analytical, preparative, and therapeutic applications, but also have limitations such as immunogenicity and production challenges.
MONOCLONAL ANTIBODYPREPARATION AND EVALUATIONnivedithag131
Monoclonal antibodies are identical antibodies produced from a single B cell clone that recognize a single epitope on an antigen. They are produced through hybridoma technology which involves fusing B cells from immunized mice with myeloma cells to form a hybridoma cell line. This document discusses the production and evaluation of monoclonal antibodies including immunizing mice, fusing spleen cells with myeloma cells, screening hybridomas, cloning cell lines, propagating antibodies through tissue culture or mouse ascites methods, and applications such as diagnosis and therapy.
Traditional phenotypic methods and newer genotypic methods can both be used to identify bacteria. Phenotypic methods include gram staining, culturing, and analyzing biochemical characteristics and reactions. These methods have limitations as some bacteria cannot be cultured. Genotypic methods like MALDI-TOF, PCR, and microarrays identify bacteria based on their genetic material and can identify bacteria directly from clinical samples faster than phenotypic methods. A variety of biochemical tests are used as part of phenotypic identification to analyze carbohydrate metabolism, production of specific compounds, enzyme activity, and other characteristics.
This document discusses various techniques used in immunoblotting and blotting. It begins by defining blotting as techniques used to visualize specific DNA, RNA, and proteins among contaminants. It then describes three main types of blotting - western blotting for proteins, northern blotting for RNA, and southern blotting for DNA. The document focuses on western blotting and immunoblotting. It provides details on tissue preparation, gel electrophoresis, protein transfer, blocking, detection, analysis, and applications of western blotting and immunoblotting techniques.
This document discusses biotransformation and microbial conversion of organic compounds. It defines biotransformation as the microbial conversion of a substrate into a product using enzymatic reactions. Various examples of biotransformation reactions are provided, including the production of gluconic acid, antibiotics, lactic acid, and acetic acid (vinegar). The document also discusses methods for biotransformation like growing, resting, and immobilized cells as well as cell-free extracts and enzymes. It provides details on the production processes of certain compounds like gluconic acid, vinegar, and steroids.
This document discusses monoclonal antibodies (mAbs), including their production, guidelines for cell engineering in production, and applications. It describes how mAbs are produced by fusing myeloma cells with spleen cells from immunized rats or rabbits. The fused hybridoma cells are selected in HAT medium and screened to identify clones that secrete the desired mAb. Purification methods are also outlined, along with approaches for producing human mAbs and commonly used cell lines for large-scale mAb production.
1. Stable transfection results in the integration of the gene of interest into the host cell's genome and expression of the gene over successive generations of cells, while transient transfection only leads to short-term, non-heritable expression.
2. Calcium phosphate precipitation is a common method for transfection that involves forming a fine precipitate of DNA and calcium phosphate that enters cells, but it has low efficiency.
3. CHO cells are often used for large-scale monoclonal antibody production due to advantages like post-translational modification ability and growth in suspension culture. Vector design, promoter selection, and transfection method influence expression level and stability.
This document discusses industrial enzymes and their production through microbial sources. It describes that enzymes can be produced from plants, animals, and microorganisms, but microbes are preferred for large-scale production due to their ability to be genetically manipulated and grown at low costs. The key steps in microbial production include identifying a suitable source microbe, inoculum preparation through screening and isolation, cultivation through solid-state or submerged fermentation, enzyme extraction from cells or culture, and purification using techniques like chromatography, electrophoresis, or adsorbent gels.
This document discusses cell culture based vaccine production. It begins by introducing different types of vaccines and traditional egg-based vaccine production methods and their limitations. It then describes the importance and advantages of cell culture based production, including types of cells used. The key steps of the cell culture based production process are outlined, including strain selection, bulk production, purification, virus inactivation, formulation, quality control testing, and lot release. Examples are given of specific vaccines produced through cell culture methods like influenza, rabies, and dengue vaccines. The conclusion discusses the potential for cell culture to replace egg-based methods and future research perspectives.
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Modern vaccine presentation
1. Presentation
Topic: 2Modern Vaccines
By Hamze Suleiman H. Nour ( DVM, MSc Candidate).
Tropical Veterinary Medicine
Mekelle Univeristy
CVM-MU, 2019
3/13/2019 1
2. Steps vaccine production
Selecting for strain for vaccine production
Virus /bacteria (seed)
Killed or Inactivation of organism
Solvent / detergent (S/D) in activation
Pasteurisation
Acid pH in activation (low pH treatment
Ultraviolet (UV) inactivation
Formulation of vaccine
Suspending fluids
Preservatives and stabilizer
In activating agents
Adjuvants /enhancers
Growing the micro-organism
Various cultures
Bird embryo
Live animals inoculation
Transgenic animals
Isolation and purification of
micro-organism
Centrifugation
Chemotherapy
Filtration
Quality control and
lot release
Sterility
Chemistry & Safety
Residual toxicity
Efficacy
Risk environment
Virulence test
Batch serial release
for distribution
Sampling
Labelling
Field test (safety e &
efficacy)
Performance
monitoring
3/13/2019 2
4. • Vaccines based on synthetic components such as nucleic acids,
nucleotides or carbohydrates synthetic peptides as antigens,
polysaccharides, and Virus-Like Particle and Nanoparticle Vaccines,
are examples of the chemistry synthesis of vaccine.
• Vaccines contain the inactivated part of a disease-forming
microorganism (or antigen) that stimulates the immune system into
recognising the invading organism as 'foreign' and produces antibodies
that attach to the antigen and not only destroy it but also remember it
for future exposure.
3/13/2019 4
5. • Fragments of the pathogen can also be used as vaccines and, at the
molecular level, those parts of a macromolecule that are recognised by
the immune system are called epitopes. In general, antigens and
epitopes are made up of proteins or polysaccharides.
• Recombinant peptide vaccine consist of protein antigen that have been
produced in a heterologous expression system (e.g. bacteria, yeast).
• The vaccinated person produces antibody to the protein antigen, thus
protecting him/her from the disease.
3/13/2019 5
6. • In general, to confirm the identity and purity of their vaccine chemists use
mass spectrometry with a 'soft' ionisation technique, such as matrix-assisted
laser desorption ionisation (MALDI).
• The matrix is used to protect the relatively fragile biomolecule from being
destroyed by the laser, which vaporises and ionises the conjugate.
• Gel electrophoresis can be used to analyse synthetic vaccines. In this
method an electric current moves different biomolecules (such as proteins)
through a polymeric gel at different rates depending on their charge, size
and shape.
• A protein carrier will move through the gel at a different rate than the carrier
that is conjugated.
3/13/2019 6
7. • Step 1: isolate the nucleophile
• Step 2: isolation of electrophile
• Step 3: couple!
• Always depend optimization of individual Epitope-Paratope
pairs through evolution.
3/13/2019 7
8. • The development of a candidate synthetic peptide vaccine includes the following steps
• Step 1. Selection of immune active peptide fragments of protein antigen(s) of an
infective agent and construction of a peptide antigen (or several antigens).
• Step 2. Chemical synthesis of peptide antigens and their conjugation (if necessary)
with a carrier.
• Step 3. Immunogenicity testing of resultant constructs on laboratory animals,
determination of specificity of antibodies (raised against these constructs) and their
protective properties.
• Step 4. Preclinical trials of selected antigens.
• Step 5. The development of the candidate vaccine and laboratory technology for its
manufacture and production of samples for testing.
• Step 6. Preclinical and clinical trials of the candidate vaccine samples.
3/13/2019 8
10. Antibody: protein made by certain white blood cells in response to a foreign substance (antigen).
Carbohydrate: are sugars or several sugars linked together, contains only C, H, and O, usually in
the ratio 1:2:1.
Carbohydrate Formula: (C)n+(H2O)n = carbon + water = carbohydrates.
Classic carbohydrate-based vaccine: carbohydrate used in the vaccine is isolated from natural
sources, hence can have heterogeneity and contamination problems.
Alternative: identify carbohydrates and then synthesize them in the laboratory.
۵ Cells of our body have sensors made out of carbohydrates (on outer surface of plasma membrane)
۵ These sensors can detect many kinds of stimuli, and can signal the immune system to respond.
۵ Specific carbohydrates that carry appropriate recognition properties are synthesized and used in
carbohydrate vaccines.
3/13/2019 10
11. 3/13/2019 11
Condensation reaction.
-OH from the first and H- from the
second sugar are removed.
Glycosidic bond (-O- bond connect. the
two sugars) is formed.
sugar1- OH + HO - sugar2
sugar1- + - O - sugar2 + -OH + H-
sugar1- O - sugar2 + HOH
http://www.bergen.org/ACADEMY/Bio/molbio/LACTOSE_SYNTH/LactoseSynth.html
Synthesis two beta-glucoses
http://www.bergen.org/ACADEMY/Bio/molbio/LACTOSE_SYNTH/LactoseSynth.html
12. • These highly complex synthetic vaccines are made using solid-phase peptide synthesis - each sugar is tethered to an amino acid (bearing a
protecting group on the amino function) that can be linked to a polymeric resin bead.
• The amino group can be de-protected, ready for peptide formation with another sugar-linked amino acid, and the process repeated until the desired
peptide sequence is achieved, which can then be cleaved off the resin and conjugated to the carrier protein.
• Principle:
- Attach one side of the sugar to a secure support, the chain grows at the other side.
- Add monosaccharide one by one.
- After everything is done, cleavage from the solid support
• Main Aspects:
1. Select ‘solid phase’, a polymer inert to all reaction conditions. Most solid-phase is polystyrene, cross-linked with 1%
divinylbenzene.
2. Select linker to attach 1st sugar to the solid support, which inert to all reaction conditions.
3. Select glycosylating agents: such as thioglycosides, anomeric fluorides, trichloro-acetimidates, and sulfoxides.
4. Select protecting group: permanent protection for unoperated hydroxyl, temporary one for involved hydroxyl.
5. Repeat the coupling cycles to get the desired sequence.
6. Remove unreacted reagents at any synthetic step by a wash procedure.3/13/2019 12
13. 3/13/2019 13
Donor-bound: Dimethyldioxirane (DMDO)
converts the double bond into epoxide. OH
of acceptor 52 reacts w/ 51 to give the
desired -glycoside 53. Repeat this procedure
to get (1 6)-linked tetrasaccharide 55.
Acceptor-bound: Excess of donor is
needed to maximize yield.
Bidirectional: oligosaccharide grows in both
directions. Used to prepare branched structures.
.
http://pubs.acs.org/journals/chreay/100/i12/figures/cr9903104h00012.html
http://pubs.acs.org/journals/chreay/100/i12/figures/cr9903104h00013.html
http://pubs.acs.org/journals/chreay/100/i12/figures/cr9903104h00011.html
14. Definition
• It is a technique used is genetic engineering that involves the
identification, isolation, and insertion of gene of interest into a vector
such as a plasmid or bacteriophage to form recombinant DNA
molecule and production of large quantity of that gene fragment or
product encoded by that gene.
• Derived from the use of recombinant DNA technology.
3/13/2019 14
15. • Step 1: identification and isolation of gene of interest or DNA
fragment to be cloned.
• Step 2: insertion of this isolated gene in suitable vector.
• Step 3: introduction of this vector into suitable organism / cell called
host (transformation).
• Step 4: selection of the transformed host cell.
• Step 5: multiplication or expression of the introduced gene in the
host.
3/13/2019 15
16. • From where we get from this
gene of interest.
Genomic library
C-DNA library
Chemical synthesis of gene if
we know sequences
If the number of the copies of
the desired gene is not enough
for gene cloning we can opt for
gene amplification techniques
like PCR.
3/13/2019 16
17. • The first step is isolation of desired gene from a cell and
the digestion of the bacterial cell wall by enzymatic action.
• This is achieved by treating the bacterial cell / plant or
animal tissue with enzyme like lysosome (bacteria),
cellulose( plant cell), chitinaze (fungus).
• Genes are located on DNA molecules centrifugation with
proteins such as histones.
• RNA can be removed by treatment with ribonuclease,
protein can be removed by protease.
• Other molecules can be removed by appropriate
treatments and further subjected gradient antifugation.
• Ultimately purified DNA is precipitated out after the
addition of chilled ethanol.
3/13/2019 17
19. What is a vector?
• Any DNA molecules that has the
ability to replicate inside the host to
which desired gene has integrated for
cloning.
• Vectors include plasmids, and
bacteriophages, cosmids, BAC, yeast
vectors. Shuttle vectors, and etc.
Human DNA + Bacterial plasmid DNA = Recombinant of DNA
3/13/2019 19
20. • The purified DNA is cut into number of fragments by enzyme called restriction
endonuclease.
• each restriction endonuclease functions by inspecting the length of DNA and
recognizes a specific palindromic nucleotide sequences in that DNA.
• Then it will bind to the DNA and cut each of two stands of the double helix at
specific points.
• These procedure or process is called ‘’molecular scissors.’’ that were first
discovered by the Nathans(1970).
• Over 250 restriction enzymes have been isolated so far. When linear DNA is
treated with restriction enzymes, a large number of DNA fragments are formed.
• The resultant fragment are separated by gel electrophoresis, finally the desired
DNA fragments are selected by southern blotting technique.
3/13/2019 20
22. • Physical gene transfer methods:
electroporation
microinjection
Liposome mediated gene transfer
Silicon carbide fibre mediated gene transfer
Ultrasound mediated gene transfer
DNA transfer via pollen
• Chemical gene transfer methods:
poly ethylene Glycol mediated ( PEG mediated)
Calcium chloride mediated
DEAE dextran mediated gene transfer
• DNA imbibition cells, tissues or organs, transfers.
The process is called transformation3/13/2019 22
23. • Once the desired fragments of DNA (gene) are obtained, they are insert into
suitable vector to produced indefinite number of copies of genes.
• This is known as gene cloning. A cloning vector acts as a vehicle to carry
the desired gene.
• An ideal cloning vector should have the following properties
1. It must have low molecular weight.
2. It must have unique cleavage site for the activity of restriction enzymes at
single point.
3. It must be able to replicate truly inside host cell after its introduction.
4. It must contain genes which provide resistance to antibiotics.
3/13/2019 23
24. Several types of vectors are used in recombinant DNA technology like plasmids, phages
3/13/2019 24
25. • The enzyme DNA polymerase helps in replication of DNA is repeated many times. DNA segment can be amplified to
approximately in billion times
• i.e. 1 billion copies are made
• Such repeated replication is achieved by use of thermostable of DNA polymerase which remains active during high
temperature induced denaturation of double stranded DNA.
• The amplified fragment of desired gene can be used to ligate with vector for further cloning.
• To isolate a plamids, the bacteria cell is treated with EDTA ( Ethylene Demine Tetra Acetic Acid). Along with
lysozyme (enzyme) to digest cell wall.
• Then the bacteria cell is subjected to centrifugation in sodium lauryl sulphate solution to separate the plasmids.
• The isolated plasmid DNA is cut with same restriction endonuclease enzyme. The enzymatic cleavage cuts circular
plasmids into a linear molecule having sticky ends.
• The two sticky ends of this linear plasmid are joined to the ends of desired gene.
• The enzyme DNA ligase join the complementary ends of plasmid DNA with that of desired gene by covalent bonding
to regenerate circular Hybrid called recombinant ( r) DNA or Chromic DNA.
3/13/2019 25
27. Antibiotic resistance in a selective medium.
Visible character
Assay for biological activity
Colony hybridization
Blotting test
3/13/2019 27
28. • The recombinant plasmid are transferred into a suitable bacterial host cell (generally E.
coli). By a method known as transformation for the expression of desired gene.
• Then the cells into which the recombinant DNA are inserted called transformed cells.
• E.g if r-DNA bearing gene for resistance an antibiotics ( example, ampicillin) is transferred
into E. coli cells, the host cell become transformed into ampicillian resistance cells.
• Only transformants will grow on agar plate containing ampicillin. The transformed
recipient cells will die. The ampicillin resistance gene is called selectable marker.
• The bacteria cell walls are not ordinarily permeable to such recombinant vectors, but
reaping in dilute solution of calcium chloride renders the bacterial cell wall permeable to
the recombinant vectors.
• Inside the host cell, this r-DNA starts replicating. The transformed cell will begin to grow
on medium and divide as a separate units.
• The replicated vectors in each cell are passed on to the daughter cells given rise to
clones.
3/13/2019 28
31. • Advantages
• Those vectors that are not only safe but also easy to grow and store can be
chosen.
• Antigens which do not elicit protective immunity or which elicit damaging
responses can be eliminated from the vaccine.
• Disadvantages
• Example Cholera toxin A can be safely removed from cholera toxin.
• Since the genes for the desired antigens must be located, cloned, and
expressed efficiently in the new vector, the cost of production is high.
• When engineered vaccinia virus is used to vaccinate, care must be taken to
spare immunodeficient
3/13/2019 31
32. • Combination vaccines take two or more vaccines that could be given individually and put them into one shot. And
get the same protection as they do from individual vaccines given separately.
Combined (multivalent) vaccine are immunological products intended for
Immunisation against different diseases or,
Immunisation against multi-factorial infectious disease caused by different species, types or variants of
pathogens
• There are two driving forces which lead to the promotion of multivalent (a term which will be used synonymously
with polyvalent) and combined vaccines.
• Combination products simplify vaccine administration and allow for the introduction of new vaccines without
requiring additional health clinic visit and injections.
• Multivalent/polyvalent vector vaccine. Combined antigens from different strains (serotypes/serogroups) of one
pathogen in a single vector to immunize against one disease.
• Multidisease/multipathogen vector vaccine. Key protective antigens from two or more pathogens in a single vector
to immunize against several diseases.
3/13/2019 32
33. • The potential for vaccine combination to be more reacto-genic then the individual components.
• The effect of increasing toxoid load from conjugates and endotoxin content taken Gram positive
bacteria needs to be considered. For example, in combination for inactivated bacterial vaccines
containing E. Coli
• When an adjuvant is used to augment the immune response to a combine vaccine special
problem may appear, for absorbed vaccines adjuvanticity is usually dependant on each vaccine
component being firmly bound to adjuvant, and the presence nan-occupies sites on the adjuvant.
quality aspects
Manafucturing and controlling requirements
Formulation
Stability
Batch testing
Safety aspects
Potency aspects
The development of combined vaccine is not straightforward. Each combination should be
developed and studied individually in term of quality, safety and efficacy.
correct formulation, the stability and the computability include preservatives, excipients and
stabilizers, inactivating agents and adjuvants.
3/13/2019 33
35. • Immuno-modulation involves the manipulation of the immune system, altering
how it responds through the action of an immune-modulator.
• An immune-modulator is any molecule or compound capable of such a
manipulation, and includes cytokines, adjuvants and various inflammatory or anti-
inflammatory compounds.
• Depending on the type of immune-modulator, the action employed may involve
the suppression of inflammation, such as in an autoimmune or hypersensitivity
reaction, or may induce presentation of co-stimulatory molecules that promote a
specific type of immune response, enhancing vaccination.
• he inclusion of an adjuvant can alter the responses generated by a VLP vaccine.
For example, the adjuvant α-galactosylceramide can form a composite particle
when combined with RHDV VLP, capable of inducing increased activation of
antigen-specific T cells.
3/13/2019 35
36. Formulation largely determines
vaccination efficacy
Adjuvant
Any material that increases the immune response
against an antigen (without being immunogenic
by itself).
Delivery system
A device (colloidal particle) that allows
multimeric presentation of antigens (may
contain adjuvants).
NB: An adjuvant may act as a delivery system
vice versa!
A vaccine is more than an one antigen.
3/13/2019 36
37. • Adjuvant
Colloidal aluminium salts
Lipid A and derivatives
Muramyl dipeptide (MDP)
Saponins
Cytokines
Cholera toxin, B subunit
CpG
• Characteristics
Antigen adsorption crucial
Fragment of bacterial endotoxin
Fragments of bacterial cell walls
Plant triterpene glycosides
Interleukins, Interferon-g
Mucosal adjuvant
3/13/2019 37
• Adjuvant mechanisms
Depot function: slow release of the antigen (from the site of injection)
Attraction and stimulation of immunocompetent cells: (eg dendritic cells, lymphocytes) to the
site of injection
Delivery : of the antigen to immunocompetent cells in lymph nodes
39. Recombinant DNA technology
– First recombinant vaccine in 1985 (Hep B)
– Live vectors/in clinical trials
– DNA vaccines/in clinical trials
Approaches to reduce number of injections for the
needle are Alternatives ways:-
Combination vaccines
Single-shot vaccines
Mucosal (oral, nasal, pulmonary) vaccines
Epidermal vaccines (immunisation).
Needle-free injection
Mechanism of uptake and transport of antigen
Lipid carrier system
Oral immunization
Controlled release micro-particle for vaccine
development
Single dose vaccine delivery systems using
biodegradable polymers
3/13/2019 39