T-Cell Activation
• Concept of immune response
• T cell-mediated immune response
• B cell-mediated immune response
I. Concept of immune response
• A collective and coordinated response to the introduction of foreign substances in an individual mediated by the cells and molecules in the immune system.
II. T cell-mediated immune response
• Cell-mediated immunity is the arm of the adaptive immune response whose role is to combat infection of intracellular pathogens, such as intracellular bacteria (mycobacteria, listeria monocytogens), viruses, protozoa, etc.
T-Cell Activation
• Concept of immune response
• T cell-mediated immune response
• B cell-mediated immune response
I. Concept of immune response
• A collective and coordinated response to the introduction of foreign substances in an individual mediated by the cells and molecules in the immune system.
II. T cell-mediated immune response
• Cell-mediated immunity is the arm of the adaptive immune response whose role is to combat infection of intracellular pathogens, such as intracellular bacteria (mycobacteria, listeria monocytogens), viruses, protozoa, etc.
Slideshow is from the University of Michigan Medical
School's M1 Immunology sequence
View additional course materials on Open.Michigan:
openmi.ch/med-M1Immunology
Cytokines by Dr Rahul , Physiology SMS MEDICAL JAIPUR MOBILE NO-8764324067Dr.Rahul ,Jaipur
-CYTOKINES
-THEIR PROPERITIES
-TYPES OF CYTOKINES
-CYTOKINES RECEPTOR FAMILY
-CYTOKINES AND PYREXIA
-CYTOKINES AND OBESITY RELATED DISEASE
-CYTOKINES AS DRUGS
Slideshow is from the University of Michigan Medical
School's M1 Immunology sequence
View additional course materials on Open.Michigan:
openmi.ch/med-M1Immunology
Cytokines by Dr Rahul , Physiology SMS MEDICAL JAIPUR MOBILE NO-8764324067Dr.Rahul ,Jaipur
-CYTOKINES
-THEIR PROPERITIES
-TYPES OF CYTOKINES
-CYTOKINES RECEPTOR FAMILY
-CYTOKINES AND PYREXIA
-CYTOKINES AND OBESITY RELATED DISEASE
-CYTOKINES AS DRUGS
Presentation for Plant Physiology. I was in charge of creating and designing the presentation as well as formating the images and information. Our projec won our class competition in regards to overall look and presentation.
A brief covering basics of immunity understanding and also allowing students to understand with ease the concepts of innate immunity, adaptive immunity, Tcell, Bcell, MHC molecular genetics, and also cytokines and also its role in various disease.
Cytokine Receptors, Mohammad Mufarreh AliMMufarreh
A detailed description of the nature, types, and mechanisms of action of cytokine receptors.
Describes the different functions of cytokines and their role in the regulation of the immune response.
Cytokine receptor signalling and their regulation and the role of cytokines in disease is also covered briefly.
Immunology is the study of the immune system and is a very important branch of the medical and biological sciences. The immune system protects us from infection through
Feiyue Biotechnology as a manufacturer of ELISA kits, Antibodies, Proteins, and related reagents, we aim at providing the best products and related custom service to researchers so that they can have a good starting for their project. High quality has been guaranteed by special technical support.
Periodontitis is a chronic infectious inflammatory disease caused by microbes; however the presence of microbes is not enough for the cause of its complex nature of disease. Inflammation is the prime cause of periodontal disease. It commences with the aggregation of pathogenic microbes that induce the host to stimulate a cascade of inflammatory response reactions which in-turn leads to the destruction of the host tissues itself. There is a complex interplay of innate and adaptive immune responses which fights against the pathogens by direct interaction or by release of certain molecules including cytokines.
Cytokines are cell signalling molecules that aid cell to cell communication in immune responses and stimulate the movement of cells towards sites of inflammation, infection and trauma. Cytokine biology reveals that there are some subsets of cytokines which are pro-inflammatory cytokines which stimulate the inflammatory responses and cause tissue destruction.
A periodontist is expected to have a sound basis of the cytokine profile to understand the pathogenesis of periodontitis and also to discover the new treatment modality of anti-cytokine therapy.
The main effector cells of innate immunity are macrophages, neutrophils, dendritic cells, and natural killer (NK) cells .
Phagocytosis, release of inflammatory mediators, activation of complement system proteins, as well as synthesis of acute phase proteins, cytokines and chemokines are the main mechanisms in innate immunity
Immune system and its functions
The main effector cells of innate immunity are macrophages, neutrophils, dendritic cells, and natural killer (NK) cells .
The interleukins represent another large family of cytokines, with at least 25 different constituent members having been characterized thus far. Most of the interleukins are produced by a number of different cell types. Here, we introduce one of the important interleukins, interleukin-2. Contents contain interleukin-2 receptor, biological activity, cancer treatment, infectious diseases and Inhibition of interleukin-2 activity.
New Drug Discovery and Development .....NEHA GUPTA
The "New Drug Discovery and Development" process involves the identification, design, testing, and manufacturing of novel pharmaceutical compounds with the aim of introducing new and improved treatments for various medical conditions. This comprehensive endeavor encompasses various stages, including target identification, preclinical studies, clinical trials, regulatory approval, and post-market surveillance. It involves multidisciplinary collaboration among scientists, researchers, clinicians, regulatory experts, and pharmaceutical companies to bring innovative therapies to market and address unmet medical needs.
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Knee anatomy and clinical tests 2024.pdfvimalpl1234
This includes all relevant anatomy and clinical tests compiled from standard textbooks, Campbell,netter etc..It is comprehensive and best suited for orthopaedicians and orthopaedic residents.
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
ASA GUIDELINE
NYSORA Guideline
2 Case Reports of Gastric Ultrasound
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
2. Introduction
Cytokines are peptides synthesized and released by white
blood cells and tissue macrophages that stimulate or
suppress the functional activity of lymphocytes, monocytes,
neutrophils, fibroblast cells, and endothelial cells.
Cytokines are substances released by leukocytes and other
cells that control the development of the immune response.
3. Often termed the hormones of the immune system, they
modulate the differentiation and division of hematopoietic
stem cells and activation of lymphocytes and phagocytes.
Corticosteroids were among the earliest compounds found to
have immuno suppressive activity.
4. The binding of the glucocorticoids to their receptors blocks
the synthesis or release of lymphokines and cytokines.
This results in an inhibition of T-cell response to
stimulation, a redistribution of lymphocytes from the
vascular to the lymphatic system, and a decrease in the
number of circulating T-cells and B-cells.
The cellular immune response is blunted, but almost no
immuno suppressive effect is seen in the humoral response
(antibody production).
5. Cytokines are soluble proteins that interact with specific
cellular receptors that are involved in the regulation of the
growth and activation of immune cells and mediate normal
and pathologic inflammatory and immune responses.
Cytokines are peptides used by cells for intercellular
communication and for controlling the inner environment of
the cells in which they operate.
6. They are produced by cell types that have important roles in
the immune response, inflammation, hemopoiesis, healing,
and systemic response to injury.
Many cytokines can be measured by bioassay and
immunoassay.
7. Clinical significance
Cytokines and the inflammatory process
The immunoinflammatory system is a complex network of
cells and humoral elements that includes many cytokines.
Typically, an immunoinflammatory response is triggered by
an antigen.
8. The antigen is presented by specialized cells termed antigen-
presenting cells (APCs) that present the antigen through
either class I or II restriction of the major histocompatibility
complex (MHC).
CD4 lymphocytes have two subtypes: Th1 and Th2.
9.
10. The transformation of CD4 lymphocytes into Th1 or Th2
subtypes is currently thought to be the central stage of the
immune response.
Although unconfirmed, it is thought that Th0 lymphocytes
can polarize into Th1 or Th2 cells according to the cytokines
contained in the micro-environment in which the cells
reside.
When CD4 lymphocytes are transformed into Th1 or Th2
subtypes, they produce a characteristic cytokine profile.
11.
12.
13. The figure represents a general scheme of the development
of human CD4 Th1 cells.
The figure summarizes the Th2 polarization, which usually
occurs due to antigenic stimulation by allergens or
helminthic (parasite) antigens.
14.
15. Cytokines and cancer
Cancers are a very heterogeneous group of diseases, and the
mechanisms of malignant transformation and continuation
are very diverse in different tumors.
They represent diseases in which intercellular signalling
mechanisms have been damaged so as to remove the normal
constraints on cellular growth and replication.
16. In many cases, cytokines form part of these control
mechanisms or induce other molecules that perform these
functions.
For example, some proto-oncogenes and oncogenes code for
normal or abnormal components of cytokine receptor or
signal transduction pathways.
17. Cytokines may have growth inhibitory properties directly on
cancer cells, cause tumor regression due to modification of
the host tumor relationship, or enhance anti-tumor immune
effects.
They may also act as growth factors for malignant cells.
18. As far as the clinical laboratorian is concerned, the
measurement of cytokines in biological fluids may be useful
for monitoring progression of some tumors and for
therapeutic monitoring when they are used as anticancer
agents.
19. Regulation of growth and differentiation
The IFNs naturally assumed great importance in the search
for tumor-modifying cytokines in view of their growth
inhibitory properties on many cells.
They can down-regulate the expression of cellular proto-
oncogenes such as myc, the enzymes associated with DNA
replication, and the receptors for growth factors such as EGF.
20. In vivo they may also activate cytotoxic T cells.
IL-6 inhibits the growth of a variety of human cell lines
derived from malignant tumors of breast, ovary, and myeloid
cells.
IL-6 is a potent growth factor for plasmacytoma and
myeloma cells.
21. Toxicity for Tumor cells
The mechanisms are arachidonic acid dependent and may
involve the production of oxygen free radicals that destroy
the tumor cell DNA.
TheTNFs can inhibit tumor cell growth by a direct cytotoxic
effect, inhibit proliferation, and induce differentiation.
22. TNF can also stimulate growth of some malignant cells.
TNF exhibits protumor effects.
23. Immune response to tumor
The tumor-suppressor roles of cytokines include many
regulatory effects on the immune system.
The IFNs enhance the expression of MHC class I antigens on
many different normal and malignant cell types, making
them susceptible to killing by cytotoxic T cells.
24. IL-2 stimulates peripheral blood lymphocytes, rendering a
subpopulation of them more cytotoxic for tumor cells.
This subpopulation of cells is known as lymphokine-
activated killer cells (LAK cells).
LAK cells probably form part of the NK-cell population.
25. NK-cell population is responsible for immune surveillance of
potentially malignant cells.
IL-2 is used therapeutically intravenously or subcutaneously
and in renal cell carcinoma, and melanoma gives responses
significantly better than chemotherapy.
26. LAK cells may be stimulated ex vivo using lymphocytes
derived from plasmapheresis and reinfused into the patient.
Tumor infiltrating lymphocytes (TILs) may be extracted and
stimulated.
Significant toxicity limits the dose of IL-2.
27.
28. Mediation of paraneoplastic effects
A wide range of paraneoplastic effects seem to be mediated
by cytokines.
The fever that so often accompanies cancer is mediated by
IL-6, IL-1, and TNF.
Fever typically occurs in lymphoid malignancies in which
these cytokines are released.
29. Anemia may be mediated by TNF, thrombocytoses by IL-6.
Cachexia is mediated by TNF and IFNγ.
Bone reabsorbtion and hypercalcaemia are induced by IL-1.
30. Cytokines as tumor markers
IL-6 levels are elevated in a significant proportion of patients
with myeloma and correlate broadly with disease activity,
proliferation index, and survival.
Patients with monoclonal gammapathies of undetermined
significance (MGUS) generally have normal or low levels of
IL-6.
31. In Hodgkin’s disease and non-Hodgin’s lymphoma, there is a
correlation between symptoms of fever and malaise and IL-6
level.
Elevated concentrations of the soluble IL-2 receptor (sIL-2R)
have been found in a number of malignancies of the
lymphoid system and the leukemias.
32. In children with acute lymphoid leukemia, raised levels
predict relapse and correlate with survival.
The use of sIL-2R measurements will have a place in the
management of the hematological malignancies.
33. TNF expression or protein production has been
demonstrated in many cancer cell lines and biopsies.
Serum TNF and sTNFR levels are raised in a wide range of
malignancies.
Their measurement may be useful in follow-up studies.
34. A high proportion of patients with hematological
malignancies have raised levels of M-CSF.
M-CSF is a tumor marker for ovarian cancer.
There is great interest in the use of M-CSF together with
CA125 as an index of therapy in the ovarian cancer.
35. A number of the growth factors, such as the IGFs, PDGF, and
the TGFs, show raised serum concentratons in various
cancers.
Serum TGFα levels is raised in breast cancer, hepatocellular
cancer.
The TGFα urinary levels are raised in head and neck cancer.
36. Clincal significance
Rheumatoid arthritis
It is a systemic inflammatory disease in joints and other
tissues.
The disease is initiated, in a genetically predisposed
individual, by activation of helper T cells responding to some
arthritogenic agent, possibly a microbe.
37. Activated CD4+ cells produce a number of cytokines that
have two principal effects:
(I) Activation of macrophages and other cells in the joint
space, which release tissue-destructive enzymes and
other factors that perpetuate inflammation, and
(I) Activation of the B-cell system, resulting in the
production of antibodies, some of which are directed
against self-constituents.
38. The resultant auto-immune reactions damage the joints and
are believed to play an important role in disease progression.
The rheumatoid synovium is embarassingly rich in both
lymphocye and monocytes desired cytokines.
39. The activity of these cytokines can account for many features
of rheumatoid synovitis.
IL-1 and TGF-β, cause proliferation of synovial cells and
fibroblasts.
They also stimulate synovial cells and chondrocytes to
secrete proteolytic and matrix-degrading enzymes.
40. In RA, a role for IL-15, secreted by activated T cells and
macrophages, seems prominent.
TNF, IL-1, IL-6, IL-15, interferon-γ, and growth factors (GM-
CSF, TGF-β) as well as proteases and elastases released by
leukocytes and synoviocytes.
TNF-α and IL-1 upregulate expression of adhesion molecules
by endothelial cells, resulting in the accumulation of white
cells in the inflammed synovium.
41. Cartilage destruction, both at the interface with the pannus
and distant from it, is further enhanced by IL-1 and TNF-α as
these cytokines also stimulate the chondrocytes to produce
more degradative enzymes and inhibit their synthesis of
reparative proteoglycans.
There is a sustained, irreversible cartilage destruction.
42.
43. Septic shock
Shock or cardiovascular collapse is the final common
pathway for a number of potentially lethal clinical events,
including severe hemorrhage, extensive trauma or burns,
large myocardial infarction, massive pulmonary embolism
and microbial sepsis.
Shock constitutes systemic hypoperfusion due to reduction
either in cardiac output or in the effective circulating blood
volume.
44. The end results are hypotension, followed by impaired tissue
perfusion and cellular hypoxia.
The mononuclear phagocytes respond to lipopolysaccharides
(LPS) by producing TNF, which in turn induces IL-1
synthesis.
45. TNF and IL-1 both act on endothelial cells to produce further
cytokines (e.g., IL-6 and IL-8), as well as induce adhesion
molecules.
Thus, the initial release of LPS results in a circumscribed
cytokine cascade intended to enhance the local acute
inflammatory response and improve clearance of the
infection.
46. With moderately severe infections, and therefore with higher
levels of LPS ( and a consequent augmentation of the
cytokine cascade ), cytokine-induced secondary effectors (
e.g., nitric oxide and platelet-activating factor ) become
significant.
In addition, systemic effects of TNF and IL-1 may begin to be
seen, including fever and increased synthesis of acute-phase
reactants.
47. Tuberculosis
Tuberculosis is a communicable chronic granulomatous
disease caused by mycobacterium tuberculosis.
It usually involves the lungs but may affect any organ or
tissue in the body.
Typically, the centre of tubercular granulomas undergo
caseous necrosis.
48. The sequence of events following an initial lung infection
are
(i) Antigen from the tubercle bacillus reaches draining lymph
nodes and is presented to T cells.
CD4+ cells of the THI type are sensitized and recirculate to
the site of infection.
Critical in this initial generation of sensitized THI cells is
elaboration of IL-12 by the macrophages.
49.
50. (ii) Sensitized CD4+ cells release cytokines when exposed to
antigen at the site of infection.
(iii) Monocytes are recruited and activated (particularly by γ-
interferon from the CD4+ cells) to kill or inhibit the growth
of the organism.
51. (iv) In response to cytokines and possibly the constituents of
the cell wall of the bacillus, some of the activated
macrophages form granulomas, which may subsequently
entrap the residual microorganisms.
(v) CD4+ helper T cells also facilitate the development of CD8+
cytotoxic T cells, which can not only kill tuberculosis-
infected macrophages but also produce IFN-γ.