Rejection is a complex process where the recipient's immune system attacks the transplanted organ or graft as foreign. It involves both cell-mediated and antibody-mediated immunity. There are three main types of rejection: hyperacute rejection which occurs within minutes/hours due to pre-existing antibodies, acute rejection within months due to an immune response, and chronic rejection over longer periods due to inflammation. Preventing rejection requires immunosuppressive drugs or techniques to block co-stimulatory signals needed for an immune response.
This document discusses transplantation immunology and allograft rejection. It begins with general principles, including that transplantation between genetically different individuals leads to rejection due to an adaptive immune response. It then covers adaptive immune responses to allografts, including that histocompatibility proteins like MHC molecules stimulate responses. It discusses patterns of allograft rejection like hyperacute, acute, and chronic rejection. Finally, it outlines methods to prevent rejection, including immunosuppression drugs, donor selection to minimize antigen differences, and testing for preformed antibodies.
Transplant rejection occurs when the immune system of a transplant recipient attacks and rejects the donated organ or tissue. There are four types of grafts based on genetic relationship between donor and recipient: autografts, isografts, allografts, and xenografts. For successful transplantation without rejection, matching major histocompatibility locus antigens between donor and recipient is important. Rejection can be avoided by tissue typing to ensure donor and recipient tissues are as similar as possible.
This is a powerpoint presentation on the Topic of Diseases of the immune system, part 1 - Chapter 6, based on Robbin's textbook of pathology. Prepared by Dr. Ashish Jawarkar, who is Assistant professor at Parul institute of medical sciences and research, Vadodara. Please subscribe to our youtube channel https://www.youtube.com/channel/UCwjkzK-YnJ-ra4HMOqq3Fkw . Our facebook page: facebook.com/pathologybasics. Instagram handle @pathologybasics
1. Transplantation immunology examines the immune response to transplanted tissues.
2. Major events include the first successful organ transplants in the 1950s-60s of kidneys, livers, hearts, and bone marrow.
3. Graft rejection is driven by an immune response to foreign histocompatibility antigens like MHC proteins, with T-cells playing a key role through cell-mediated responses. Immunosuppressive drugs help prevent rejection by inhibiting T-cell activation and proliferation.
Transplantation involves transferring organs, tissues or cells from one part of the body to another or between individuals. Compatibility of immune molecules like HLA antigens, ABO blood groups, MIC antigens and KIR determines transplant success. Major histocompatibility complex (MHC) molecules control immune response and are targets in transplant rejection. Incompatibility can lead to hyperacute, acute cellular or chronic rejection as well as graft-versus-host disease. Immunosuppressive agents like corticosteroids, calcineurin inhibitors and monoclonal antibodies are used to suppress anti-graft immune responses.
Type I, II, III, and IV hypersensitivity reactions are classified based on their pathogenic mechanisms. Type I reactions involve IgE antibodies and mast cell degranulation. Type II reactions involve IgG or IgM antibodies binding to cell surfaces and activating complement. Type III reactions involve immune complex deposition in tissues. Type IV reactions are T cell-mediated and occur hours to days after antigen exposure. Examples of each type are discussed.
Rejection is a complex process where the recipient's immune system attacks the transplanted organ or graft as foreign. It involves both cell-mediated and antibody-mediated immunity. There are three main types of rejection: hyperacute rejection which occurs within minutes/hours due to pre-existing antibodies, acute rejection within months due to an immune response, and chronic rejection over longer periods due to inflammation. Preventing rejection requires immunosuppressive drugs or techniques to block co-stimulatory signals needed for an immune response.
This document discusses transplantation immunology and allograft rejection. It begins with general principles, including that transplantation between genetically different individuals leads to rejection due to an adaptive immune response. It then covers adaptive immune responses to allografts, including that histocompatibility proteins like MHC molecules stimulate responses. It discusses patterns of allograft rejection like hyperacute, acute, and chronic rejection. Finally, it outlines methods to prevent rejection, including immunosuppression drugs, donor selection to minimize antigen differences, and testing for preformed antibodies.
Transplant rejection occurs when the immune system of a transplant recipient attacks and rejects the donated organ or tissue. There are four types of grafts based on genetic relationship between donor and recipient: autografts, isografts, allografts, and xenografts. For successful transplantation without rejection, matching major histocompatibility locus antigens between donor and recipient is important. Rejection can be avoided by tissue typing to ensure donor and recipient tissues are as similar as possible.
This is a powerpoint presentation on the Topic of Diseases of the immune system, part 1 - Chapter 6, based on Robbin's textbook of pathology. Prepared by Dr. Ashish Jawarkar, who is Assistant professor at Parul institute of medical sciences and research, Vadodara. Please subscribe to our youtube channel https://www.youtube.com/channel/UCwjkzK-YnJ-ra4HMOqq3Fkw . Our facebook page: facebook.com/pathologybasics. Instagram handle @pathologybasics
1. Transplantation immunology examines the immune response to transplanted tissues.
2. Major events include the first successful organ transplants in the 1950s-60s of kidneys, livers, hearts, and bone marrow.
3. Graft rejection is driven by an immune response to foreign histocompatibility antigens like MHC proteins, with T-cells playing a key role through cell-mediated responses. Immunosuppressive drugs help prevent rejection by inhibiting T-cell activation and proliferation.
Transplantation involves transferring organs, tissues or cells from one part of the body to another or between individuals. Compatibility of immune molecules like HLA antigens, ABO blood groups, MIC antigens and KIR determines transplant success. Major histocompatibility complex (MHC) molecules control immune response and are targets in transplant rejection. Incompatibility can lead to hyperacute, acute cellular or chronic rejection as well as graft-versus-host disease. Immunosuppressive agents like corticosteroids, calcineurin inhibitors and monoclonal antibodies are used to suppress anti-graft immune responses.
Type I, II, III, and IV hypersensitivity reactions are classified based on their pathogenic mechanisms. Type I reactions involve IgE antibodies and mast cell degranulation. Type II reactions involve IgG or IgM antibodies binding to cell surfaces and activating complement. Type III reactions involve immune complex deposition in tissues. Type IV reactions are T cell-mediated and occur hours to days after antigen exposure. Examples of each type are discussed.
This document discusses the history and science of organ transplantation. It begins with a brief history, highlighting Nobel Prize-winning discoveries such as the first successful organ transplant between twins in 1954. It then covers key topics like the major histocompatibility complex and mechanisms of graft rejection, such as acute cellular rejection mediated by T cells. The types of transplantation are defined, from autologous to xenogeneic grafts. Prevention of rejection involves tissue typing, immunosuppression, and vaccination. Complications like graft-versus-host disease are also summarized.
This document discusses transfusion-transmitted infections (TTIs) and methods for screening donated blood. It notes that TTIs include viruses like HIV, HBV, HCV that can remain undetected in the blood donor but be transmissible. Screening methods include serological tests like ELISA, CLIA, rapid tests, as well as nucleic acid amplification tests (NAATs) that can detect infections earlier. Implementing individual donor NAT in addition to serological screening provides an additional safety layer and reduces the risk window period for TTIs in blood donations.
Voluntary blood donors who meet selection criteria are the safest donors. Selection involves medical history screening, physical exam, and tests to ensure donor and recipient safety. Proper donor care before, during, and after donation through counseling, comfortable facilities, and addressing any reactions is important for donor retention and a sustainable blood supply. Donor selection, recruitment of low risk donors, and quality control at each stage helps ensure a safe blood transfusion system.
Apheresis is a medical technology in which blood is withdrawn from a donor or patient, separated into components, and at least one component is retained while the remainder is returned to the circulation. It is used to collect blood components like platelets, plasma, and stem cells for transfusion or therapeutic purposes. Apheresis can be performed manually or using automated machines that utilize centrifugation or filtration to separate components. It has various applications including collection of platelets, plasma exchange to remove antibodies or toxins, and stem cell collection for transplantation. Complications are usually minor but may include hypocalcemia, hypotension, and allergic reactions.
This document provides information about the Coombs test, which is used to detect antibody or complement coating of red blood cells. It describes the history and principles of the test, as well as the direct and indirect Coombs test procedures. The direct Coombs test detects in vivo coating of red blood cells and is used to diagnose conditions like hemolytic disease of the newborn. The indirect Coombs test detects in vitro coating of red cells and is used for compatibility testing and antibody screening. Factors affecting the tests and causes of false positive and negative results are also outlined.
DONOR SELECTION AND DONOR DEFERRAL.pptxDrmustafa Ali
This document discusses blood donor types and blood donation safety. There are four main types of blood donors: voluntary non-remunerated donors who donate without payment; replacement donors who donate for a specific patient; professional donors who are paid; and autologous donors who donate for their own planned procedures. Ensuring donor safety involves screening donors through medical history questionnaires and health checks before acceptance. Certain medical conditions and high risk behaviors require deferral periods before a donor can be accepted. Maintaining the safety of both donors and recipients is crucial.
The document summarizes key aspects of the complement system. It describes the three complement activation pathways - classical, lectin, and alternative. It explains the proteins involved in each pathway and their roles. The classical pathway is activated by antibody binding, while the alternative pathway is antibody-independent and acts as part of innate immunity. Complement activation results in the formation of the membrane attack complex that can lyse target cells.
The document discusses transplantation immunology and the immune response to transplants and tumors. It covers the gradations of relationships between donor and recipient tissue, from autografts which are not rejected to xenografts between different species which are. It describes the mechanisms of acute and chronic allograft rejection and ways to prolong transplant survival, including immunosuppressive drugs. It also discusses tumor antigens, the immune response against tumors, and applications of immunology for tumor diagnosis and therapy.
Bone marrow is a highly cellular, viscous, and vascular tissue found within bone cavities. It contains two types - red marrow consisting mainly of hematopoietic tissue, and yellow marrow consisting mainly of fat cells. Red marrow is the site of blood cell production and is found in flat bones and ends of long bones in adults. Bone marrow produces approximately 500 billion new blood cells per day and makes up around 2.6 kg of the average adult human body mass. It provides the microenvironment necessary to support the proliferation, differentiation, and maturation of blood-forming stem cells.
This document discusses different types of grafts and graft rejection. It defines grafts as tissue that is transplanted and grafting as a surgical procedure to replace damaged or missing skin. The main types of grafts discussed are auto grafts (from one's own body), iso grafts (between individuals of the same genotype), allografts (between individuals of the same species but different genotype), and xenografts (between different species). Full thickness and split thickness grafts are also described. Graft rejection can be hyperacute, acute, or chronic depending on how quickly it occurs after transplantation. Symptoms of rejection include organ dysfunction, discomfort, and fever. Treatment aims to suppress the immune response and ensure the trans
Blood transfusion involves collecting blood from a donor and administering it to a recipient. It is used to treat blood loss from injury or illness, raise hemoglobin levels, and provide antibodies or clotting factors. Blood is typed and cross-matched to avoid incompatible transfusions. Components like red blood cells, plasma, and platelets can be transfused individually. Reactions may occur if the blood is incompatible or improperly stored and can range from mild allergic reactions to life-threatening hemolysis.
This document discusses organ transplantation and immunological basis of allograft rejection. It defines organ transplantation as moving an organ from one body to another to replace a damaged organ. Organs that can be transplanted include the heart, kidneys, liver, lungs and pancreas. It describes the different types of transplants and mechanisms of allograft rejection, including cell-mediated immunity and humoral immunity. It also classifies allograft rejection into hyperacute rejection, acute rejection and chronic rejection.
Clotting time - Coagulation of whole bloodSHRUTHI VASAN
Coagulation of blood - Clotting Time - Introduction - Methods - Capillary Method - Tube Method - Lee White Method - Procedure - Normal Range - Discussion.
Lecture 7 diseases of the vascular system - Pathology Areej Abu Hanieh
This document discusses diseases of the vascular system. It begins by introducing arterial diseases such as atherosclerosis, which is the most common and involves the deposition of lipid plaques in artery walls. Aneurysms are localized swellings in artery walls that can be caused by atherosclerosis or other factors like hypertension. Vasospastic conditions like Raynaud's disease involve vasoconstriction of small blood vessels. The document also covers diseases of the veins such as varicose veins, chronic venous insufficiency, and venous thromboses. Deep vein thromboses in particular can be dangerous if pieces of the clot break off and travel to the lungs (pulmonary embolism).
Description of various immunological mechanisms involved in the rejection of transplants. Lecture notes for medical, dental and allied health sciences undergraduate medical students.
Immunosuppression involves reducing the activation of the immune system through medications, surgery, radiation or other means. The document discusses the history of immunosuppression and developments in transplantation including the identification of cortisone and research on the immune system. It outlines current methods of immunosuppression including calcineurin inhibitors, mTOR inhibitors, antimetabolites, corticosteroids, depleting antibodies and fusion proteins. The mechanisms, types and treatment of allograft rejection such as hyperacute, acute and chronic rejection are also summarized.
The document discusses HLA typing and its implications. It begins with a brief history of the discovery of the major histocompatibility complex (MHC) in mice and humans. It then describes the structure and functions of the MHC, including the class I, class II, and class III regions. The document discusses methods of HLA typing, including serological testing using microcytotoxicity and molecular methods. It notes some implications of HLA typing, such as its role in organ transplant matching and susceptibility to autoimmune disease.
The complement system is an important part of the innate immune system that activates through three pathways - classical, lectin, and alternative. Activation leads to the formation of C3 and C5 convertases that generate inflammatory molecules like C3a and C5a, and opsonins like C3b that promote phagocytosis. It ultimately forms the membrane attack complex that lyses target cells. Complement is tightly regulated to prevent damage to host cells and excessive inflammation. Deficiencies in complement components can increase risk of certain infections.
This document provides an overview of organ transplantation, including definitions, categories of transplants, history, graft rejection, HLA matching, organ procurement, and donation after brain death and cardiac death. Key points include:
- Transplantation involves transferring an organ or tissue from one place to another. Allotransplants between individuals of the same species require immunosuppression.
- Major milestones include the first successful organ transplant in 1954 and development of immunosuppressive drugs in the 1960s.
- Graft rejection is mediated by the immune system recognizing transplanted organs as foreign. Acute rejection typically occurs in the first 6 months while chronic rejection develops later.
- HLA matching aims to reduce rejection by finding donors with similar
This document provides an overview of transplant surgery, including:
1. It describes different types of transplants such as orthotopic, heterotopic, autotransplant, allotransplant, isotransplant, and xenotransplant.
2. It discusses graft rejection and the immune response, including hyperacute, acute, and chronic rejection.
3. It outlines the pretransplant evaluation process for transplant candidates and donors.
4. It provides details on renal transplantation techniques and evaluations of both living and deceased donors.
This document discusses the history and science of organ transplantation. It begins with a brief history, highlighting Nobel Prize-winning discoveries such as the first successful organ transplant between twins in 1954. It then covers key topics like the major histocompatibility complex and mechanisms of graft rejection, such as acute cellular rejection mediated by T cells. The types of transplantation are defined, from autologous to xenogeneic grafts. Prevention of rejection involves tissue typing, immunosuppression, and vaccination. Complications like graft-versus-host disease are also summarized.
This document discusses transfusion-transmitted infections (TTIs) and methods for screening donated blood. It notes that TTIs include viruses like HIV, HBV, HCV that can remain undetected in the blood donor but be transmissible. Screening methods include serological tests like ELISA, CLIA, rapid tests, as well as nucleic acid amplification tests (NAATs) that can detect infections earlier. Implementing individual donor NAT in addition to serological screening provides an additional safety layer and reduces the risk window period for TTIs in blood donations.
Voluntary blood donors who meet selection criteria are the safest donors. Selection involves medical history screening, physical exam, and tests to ensure donor and recipient safety. Proper donor care before, during, and after donation through counseling, comfortable facilities, and addressing any reactions is important for donor retention and a sustainable blood supply. Donor selection, recruitment of low risk donors, and quality control at each stage helps ensure a safe blood transfusion system.
Apheresis is a medical technology in which blood is withdrawn from a donor or patient, separated into components, and at least one component is retained while the remainder is returned to the circulation. It is used to collect blood components like platelets, plasma, and stem cells for transfusion or therapeutic purposes. Apheresis can be performed manually or using automated machines that utilize centrifugation or filtration to separate components. It has various applications including collection of platelets, plasma exchange to remove antibodies or toxins, and stem cell collection for transplantation. Complications are usually minor but may include hypocalcemia, hypotension, and allergic reactions.
This document provides information about the Coombs test, which is used to detect antibody or complement coating of red blood cells. It describes the history and principles of the test, as well as the direct and indirect Coombs test procedures. The direct Coombs test detects in vivo coating of red blood cells and is used to diagnose conditions like hemolytic disease of the newborn. The indirect Coombs test detects in vitro coating of red cells and is used for compatibility testing and antibody screening. Factors affecting the tests and causes of false positive and negative results are also outlined.
DONOR SELECTION AND DONOR DEFERRAL.pptxDrmustafa Ali
This document discusses blood donor types and blood donation safety. There are four main types of blood donors: voluntary non-remunerated donors who donate without payment; replacement donors who donate for a specific patient; professional donors who are paid; and autologous donors who donate for their own planned procedures. Ensuring donor safety involves screening donors through medical history questionnaires and health checks before acceptance. Certain medical conditions and high risk behaviors require deferral periods before a donor can be accepted. Maintaining the safety of both donors and recipients is crucial.
The document summarizes key aspects of the complement system. It describes the three complement activation pathways - classical, lectin, and alternative. It explains the proteins involved in each pathway and their roles. The classical pathway is activated by antibody binding, while the alternative pathway is antibody-independent and acts as part of innate immunity. Complement activation results in the formation of the membrane attack complex that can lyse target cells.
The document discusses transplantation immunology and the immune response to transplants and tumors. It covers the gradations of relationships between donor and recipient tissue, from autografts which are not rejected to xenografts between different species which are. It describes the mechanisms of acute and chronic allograft rejection and ways to prolong transplant survival, including immunosuppressive drugs. It also discusses tumor antigens, the immune response against tumors, and applications of immunology for tumor diagnosis and therapy.
Bone marrow is a highly cellular, viscous, and vascular tissue found within bone cavities. It contains two types - red marrow consisting mainly of hematopoietic tissue, and yellow marrow consisting mainly of fat cells. Red marrow is the site of blood cell production and is found in flat bones and ends of long bones in adults. Bone marrow produces approximately 500 billion new blood cells per day and makes up around 2.6 kg of the average adult human body mass. It provides the microenvironment necessary to support the proliferation, differentiation, and maturation of blood-forming stem cells.
This document discusses different types of grafts and graft rejection. It defines grafts as tissue that is transplanted and grafting as a surgical procedure to replace damaged or missing skin. The main types of grafts discussed are auto grafts (from one's own body), iso grafts (between individuals of the same genotype), allografts (between individuals of the same species but different genotype), and xenografts (between different species). Full thickness and split thickness grafts are also described. Graft rejection can be hyperacute, acute, or chronic depending on how quickly it occurs after transplantation. Symptoms of rejection include organ dysfunction, discomfort, and fever. Treatment aims to suppress the immune response and ensure the trans
Blood transfusion involves collecting blood from a donor and administering it to a recipient. It is used to treat blood loss from injury or illness, raise hemoglobin levels, and provide antibodies or clotting factors. Blood is typed and cross-matched to avoid incompatible transfusions. Components like red blood cells, plasma, and platelets can be transfused individually. Reactions may occur if the blood is incompatible or improperly stored and can range from mild allergic reactions to life-threatening hemolysis.
This document discusses organ transplantation and immunological basis of allograft rejection. It defines organ transplantation as moving an organ from one body to another to replace a damaged organ. Organs that can be transplanted include the heart, kidneys, liver, lungs and pancreas. It describes the different types of transplants and mechanisms of allograft rejection, including cell-mediated immunity and humoral immunity. It also classifies allograft rejection into hyperacute rejection, acute rejection and chronic rejection.
Clotting time - Coagulation of whole bloodSHRUTHI VASAN
Coagulation of blood - Clotting Time - Introduction - Methods - Capillary Method - Tube Method - Lee White Method - Procedure - Normal Range - Discussion.
Lecture 7 diseases of the vascular system - Pathology Areej Abu Hanieh
This document discusses diseases of the vascular system. It begins by introducing arterial diseases such as atherosclerosis, which is the most common and involves the deposition of lipid plaques in artery walls. Aneurysms are localized swellings in artery walls that can be caused by atherosclerosis or other factors like hypertension. Vasospastic conditions like Raynaud's disease involve vasoconstriction of small blood vessels. The document also covers diseases of the veins such as varicose veins, chronic venous insufficiency, and venous thromboses. Deep vein thromboses in particular can be dangerous if pieces of the clot break off and travel to the lungs (pulmonary embolism).
Description of various immunological mechanisms involved in the rejection of transplants. Lecture notes for medical, dental and allied health sciences undergraduate medical students.
Immunosuppression involves reducing the activation of the immune system through medications, surgery, radiation or other means. The document discusses the history of immunosuppression and developments in transplantation including the identification of cortisone and research on the immune system. It outlines current methods of immunosuppression including calcineurin inhibitors, mTOR inhibitors, antimetabolites, corticosteroids, depleting antibodies and fusion proteins. The mechanisms, types and treatment of allograft rejection such as hyperacute, acute and chronic rejection are also summarized.
The document discusses HLA typing and its implications. It begins with a brief history of the discovery of the major histocompatibility complex (MHC) in mice and humans. It then describes the structure and functions of the MHC, including the class I, class II, and class III regions. The document discusses methods of HLA typing, including serological testing using microcytotoxicity and molecular methods. It notes some implications of HLA typing, such as its role in organ transplant matching and susceptibility to autoimmune disease.
The complement system is an important part of the innate immune system that activates through three pathways - classical, lectin, and alternative. Activation leads to the formation of C3 and C5 convertases that generate inflammatory molecules like C3a and C5a, and opsonins like C3b that promote phagocytosis. It ultimately forms the membrane attack complex that lyses target cells. Complement is tightly regulated to prevent damage to host cells and excessive inflammation. Deficiencies in complement components can increase risk of certain infections.
This document provides an overview of organ transplantation, including definitions, categories of transplants, history, graft rejection, HLA matching, organ procurement, and donation after brain death and cardiac death. Key points include:
- Transplantation involves transferring an organ or tissue from one place to another. Allotransplants between individuals of the same species require immunosuppression.
- Major milestones include the first successful organ transplant in 1954 and development of immunosuppressive drugs in the 1960s.
- Graft rejection is mediated by the immune system recognizing transplanted organs as foreign. Acute rejection typically occurs in the first 6 months while chronic rejection develops later.
- HLA matching aims to reduce rejection by finding donors with similar
This document provides an overview of transplant surgery, including:
1. It describes different types of transplants such as orthotopic, heterotopic, autotransplant, allotransplant, isotransplant, and xenotransplant.
2. It discusses graft rejection and the immune response, including hyperacute, acute, and chronic rejection.
3. It outlines the pretransplant evaluation process for transplant candidates and donors.
4. It provides details on renal transplantation techniques and evaluations of both living and deceased donors.
Dr. Dharmendra Joshi presented on the principles of organ transplantation. Key points included: defining transplantation terms; organs that can be transplanted; immunology principles like graft rejection; pre-operative, intra-operative, and post-operative principles; ethical considerations; and future trends like newer immunosuppressive therapies. The goal of transplantation is to replace a failing organ with a functioning one from a donor to treat end-stage organ disease through improved surgical techniques and immunosuppression.
Transplant rejection occurs when the immune system of the transplant recipient attacks and destroys the transplanted organ or tissue, perceiving it as foreign. There are several types of rejection including hyperacute, acute, and chronic rejection. Acute rejection occurs within days or weeks after transplantation and is usually T-cell mediated, while chronic rejection develops over months to years and is characterized by accelerated arteriosclerosis and fibrosis. Pathologists play an important role in diagnosing rejection by examining biopsy samples of transplanted organs and applying standardized grading systems to classify the type and severity of rejection.
Transplant pathologists play an essential role in organ transplantation by evaluating biopsies of failing organs, matching donor and recipient tissues, assessing donor organ viability, and monitoring for rejection or complications through histopathological examination of biopsies. Key tasks include initial patient evaluation, blood and tissue typing to ensure compatibility, evaluating donor organs, and monitoring allografts over time with protocol biopsies to diagnose issues like acute or chronic rejection, infection, drug toxicity, or disease recurrence. The pathologist aims to ensure transplant success and identify any issues requiring clinical intervention.
Transplantation basics explained with history . For details look at the subtext for every slide. Immune suppression drugs. Body reaction to grafts are all explained
This document discusses transplantation immunology and organ transplantation. It begins by defining transplantation as taking cells, tissues, or organs from one individual and placing them into another. It describes different types of grafts, including autologous, syngeneic, allogeneic, and xenogeneic grafts. It then discusses transplantation antigens such as major histocompatibility antigens and minor histocompatibility antigens. It explains the mechanisms of graft rejection, including T-cell mediated rejection, antibody-mediated rejection, and NK cell mediated rejection. It also covers preventing rejection through matching transplantation antigens and using immunosuppressive drugs like calcineurin inhibitors and IMPDH inhibitors.
Organ transplantation involves transferring a whole or partial organ from a donor to a recipient in need of replacement of a damaged or failing organ. Major transplantable organs include the liver, kidney, heart, lungs, pancreas and intestine. Transplant rejection is a major complication that occurs when the recipient's immune system attacks the donor organ. The main types of rejection are hyperacute, acute vascular, acute cellular and chronic rejection. Rejection is combatted using immunosuppressive drugs that inhibit lymphocyte proliferation and activation such as corticosteroids, calcineurin inhibitors, antiproliferatives and anti-T cell agents. With advances in immunosuppression and organ matching, transplantation has become an established treatment for end-stage organ
This document discusses transplantation antigens and mechanisms of transplant rejection. It defines types of transplantation including autografts, allografts, and xenografts. The major histocompatibility complex (MHC) plays an important role in antigen presentation and recognition, with MHC matching reducing rejection. Rejection can occur via antibody-mediated or T cell mediated mechanisms. Immunosuppressive drugs are used to prevent rejection by targeting lymphocytes and immune responses. The fetus is not rejected by the mother due to weak MHC expression on the placenta which acts as a barrier between maternal and fetal tissues.
This document discusses the immunology of transplantation. It begins by defining transplantation immunology and describing the different types of transplants including autografts, isografts, allografts, and xenografts. Transplantation between non-genetically identical individuals leads to rejection via an adaptive immune response. The mechanisms of acute and chronic rejection are then described. Tests for donor and recipient compatibility include blood typing, HLA typing through serological and molecular methods, and cross-matching tests. Complete prevention of rejection is difficult due to minor histocompatibility antigens, so immunosuppression drugs are generally required.
Immunology of Transplantation and Rejection A. Rakha
This file gives info about transplantation and the immunological problem like tissue rejection. MHC role in transplantation, laws, and types of tissue transplantation. Explains all kinds of tissue rejection and source of tissue. Some immunological terms plus transplantation history, it also includes the genetic basis of Transplantation. Hope it's helpful
Principles of organ transplant and Renal transplantDr Navil Sharma
This document provides an overview of organ transplant principles. It defines different types of transplants and discusses transplant immunology, including graft rejection. The key principles covered are pre-operative (patient selection, counseling, informed consent), intra-operative (organ procurement and preservation), and post-operative (assessment, immunosuppression, follow up). Complications and ethical considerations are also mentioned. Overall, the document outlines the major concepts and steps involved in organ transplantation.
Sepsis is a life-threatening condition caused by the body's response to infection. It has been defined in various ways over time, with the most recent Sepsis-3 definition describing it as a dysregulated immune response leading to organ dysfunction. Diagnosis involves assessing symptoms, signs of infection and organ dysfunction, along with diagnostic tests. Management involves rapid fluid resuscitation, antibiotics within 1 hour of recognition, vasopressors to maintain blood pressure and organ perfusion, and treatment of the underlying infection in an intensive care unit. Delays in recognition and treatment can increase mortality risk.
Role of transfusion medicine in hematopoietic stem cellFigo Khan
The role of transfusion medicine in hematopoietic stem cell transplantation involves donor evaluation and stem cell collection, processing, cryopreservation, thawing, and infusion. Transfusion medicine specialists ensure proper HLA typing and immunohematologic compatibility between donors and recipients. They collect stem cells via bone marrow aspiration, peripheral blood apheresis, or umbilical cord blood collection. Collected stem cells are processed, cryopreserved, thawed as needed, and infused into recipients. Transfusion medicine specialists also provide transfusion support and monitor for engraftment and complications related to ABO blood group compatibility.
Hodgkins lymphoma pathogenesis and targets for therapyJan-Gert Nel
Hodgkin's lymphoma has progressed greatly in treatment since the mid-20th century with radiotherapy and chemotherapy. However, these treatments carry late toxicities. The pathogenesis of Hodgkin's lymphoma involves constitutive NF-kB activation in Reed-Sternberg cells, which promotes resistance to apoptosis. Epstein-Barr virus association varies by subtype and epidemiological factors. Emerging biologically-based treatment strategies target pathways like NF-kB, CD30, and the proteasome to induce apoptosis in Reed-Sternberg cells.
Antibody mediated rejection of solid organ allograftstashagarwal
Objectives:
Introduction of Antibody mediated rejection AMR
Role of C4d in transplant rejection
Donor specific antibodies DSA
Presentation of AMR in kidney, liver, lung and heart.
This document provides an introduction to renal allograft pathology. It discusses the key topics of harvest injury, rejection including hyperacute, acute T-cell mediated, acute antibody-mediated and chronic rejection. It also covers infections, drug toxicity, and recurrence or new disease that can occur in transplant kidneys. The goal is for students to recognize pathology related to rejection, infections, toxicity and disease processes in renal allografts.
Principle of Organ Transplantation.pptxOlofin Kayode
The document provides an overview of organ transplantation, including:
- Definitions of different types of organ transplants such as allografts and xenografts.
- A historical background of major transplant milestones from the 1950s onward including the first successful kidney, liver, lung, and heart transplants.
- Details about transplant immunology, the immune response to foreign organs, and ways to suppress the immune system like with immunosuppressant drugs.
- The types of organ rejection such as hyperacute, acute, and chronic rejection.
- Considerations for organ donation, procurement, preservation, and transplantation.
- Complications after transplantation like infection and potential future directions.
1. Transplant immunology involves replacing nonfunctioning organs or tissues with healthy donor grafts. Major barriers include innate immune responses like complement activation and adaptive responses like allograft rejection mediated by T cells recognizing donor HLA antigens.
2. Acute rejection occurs within days/weeks and includes cellular rejection from CTL killing and antibody-mediated rejection from donor HLA antibodies. Chronic rejection develops over months/years and is characterized by vascular occlusion.
3. Immunosuppression minimizes immunogenicity differences and uses drugs like cyclosporine, tacrolimus and mycophenolate to inhibit T cell responses or antibody production against donor antigens.
Similar to TRANSPLANT REJECTION - TYPES & MECHANISM (20)
ROLE OF PATHOLOGIST IN DIAGNOSIS & MANAGEMENT OF DISEASEIra Bharadwaj
A pathologist plays two key roles in patient care: diagnosis of disease and management of disease. For diagnosis, the pathologist uses laboratory tests to confirm clinical diagnoses and determine the specific cause of disease. This informs evidence-based treatment. For management, the pathologist assesses treatment effectiveness through laboratory parameters and ensures safe blood transfusions when needed through the blood bank. As an example, a pathologist would diagnose and monitor the specific cause and treatment of a patient's anemia through hematological tests.
This document discusses primary immune deficiency diseases. It covers the general features, etiology, and types of congenital immune deficiencies including defects of B lymphocytes like X-linked agammaglobulinemia and common variable immunodeficiency. It also discusses defects of T lymphocytes including severe combined immunodeficiency. Other conditions mentioned include DiGeorge syndrome, Wiskott-Aldrich syndrome, and complement deficiencies. Multiple choice questions are provided to test understanding of these conditions.
Wet gangrene occurs due to venous obstruction leading to tissue ischemia and bacterial proliferation in moist tissues. It presents as soft, swollen, foul-smelling black tissue without a clear line of demarcation. Diabetic foot gangrene results from peripheral vascular disease, neuropathy, and infection facilitated by hyperglycemia. Dry gangrene occurs from arterial insufficiency and presents as a dry, shrunken black tissue with a well-demarcated border. Gas gangrene involves Clostridium bacteria producing tissue-damaging toxins and crepitus. Prompt surgical debridement and antibiotics are critical for treatment.
This document discusses cell injury, including its definition, types, causes, and pathogenesis. It defines cell injury as a change that occurs in a cell due to external or internal factors in its environment. There are two types of cell injury - reversible and irreversible. Reversible injury is when the cell is damaged but viable, while irreversible injury means the cell is nonviable. Common causes of cell injury include hypoxia, chemicals, infections, physical factors, and genetic factors. The pathogenesis of cell injury involves mitochondrial damage, disturbances in calcium metabolism, damage to cellular membranes, DNA and proteins. Reversible injury can progress to irreversible injury when ATP production ceases, cell membranes lyse, vital proteins are absent, and vital
This document provides information about evaluating abnormalities in a semen analysis panel, including:
- The indications, sample collection/transport procedures, and normal ranges for semen volume, pH, motility, concentration, morphology, and other tests.
- How to interpret abnormalities in these parameters, such as low/high volume, pH, motility, oligospermia/azoospermia, teratozoospermia and their potential causes.
- Quality control procedures like repeat testing, and transient defects that could affect initial semen analysis results.
Four clinical cases are then presented to demonstrate applying this evaluation and interpretation of semen analysis results.
The document provides information on cerebrospinal fluid (CSF) examination including indications, collection, analysis, and findings in different conditions like meningitis. It discusses three clinical cases. For case 1, the diagnosis is bacterial meningitis based on cloudy CSF, low glucose, and high neutrophil count. Further tests would include cultures and sensitivity. For case 2, the diagnosis is viral meningitis (measles) based on clear CSF, normal glucose, and lymphocytic pleocytosis; complications include encephalitis. For case 3, the diagnosis is tuberculous meningitis based on low glucose, low chloride, and lymphocytic pleocytosis; confirmation requires microbiological tests.
Assessment and Planning in Educational technology.pptxKavitha Krishnan
In an education system, it is understood that assessment is only for the students, but on the other hand, the Assessment of teachers is also an important aspect of the education system that ensures teachers are providing high-quality instruction to students. The assessment process can be used to provide feedback and support for professional development, to inform decisions about teacher retention or promotion, or to evaluate teacher effectiveness for accountability purposes.
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Odoo provides an option for creating a module by using a single line command. By using this command the user can make a whole structure of a module. It is very easy for a beginner to make a module. There is no need to make each file manually. This slide will show how to create a module using the scaffold method.
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
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An import error occurs when a program fails to import a module or library, disrupting its execution. In languages like Python, this issue arises when the specified module cannot be found or accessed, hindering the program's functionality. Resolving import errors is crucial for maintaining smooth software operation and uninterrupted development processes.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
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ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...PECB
Denis is a dynamic and results-driven Chief Information Officer (CIO) with a distinguished career spanning information systems analysis and technical project management. With a proven track record of spearheading the design and delivery of cutting-edge Information Management solutions, he has consistently elevated business operations, streamlined reporting functions, and maximized process efficiency.
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His expertise extends across a diverse spectrum of reporting, database, and web development applications, underpinned by an exceptional grasp of data storage and virtualization technologies. His proficiency in application testing, database administration, and data cleansing ensures seamless execution of complex projects.
What sets Denis apart is his comprehensive understanding of Business and Systems Analysis technologies, honed through involvement in all phases of the Software Development Lifecycle (SDLC). From meticulous requirements gathering to precise analysis, innovative design, rigorous development, thorough testing, and successful implementation, he has consistently delivered exceptional results.
Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.
Thinking of getting a dog? Be aware that breeds like Pit Bulls, Rottweilers, and German Shepherds can be loyal and dangerous. Proper training and socialization are crucial to preventing aggressive behaviors. Ensure safety by understanding their needs and always supervising interactions. Stay safe, and enjoy your furry friends!
Physiology and chemistry of skin and pigmentation, hairs, scalp, lips and nail, Cleansing cream, Lotions, Face powders, Face packs, Lipsticks, Bath products, soaps and baby product,
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আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
Exploiting Artificial Intelligence for Empowering Researchers and Faculty,
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at Integral University, Lucknow, 06.06.2024
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Main Java[All of the Base Concepts}.docxadhitya5119
This is part 1 of my Java Learning Journey. This Contains Custom methods, classes, constructors, packages, multithreading , try- catch block, finally block and more.
1. PA9.3
DESCRIBE THE HLA SYSTEM & THE IMMUNE
PRINCIPLES INVOLVED IN TRANSPLANT &
MECHANISM OF TRANSPLANT REJECTION
Dr IRA BHARADWAJ
MCI TEACHER ID: PAT 2300569
KUHS FACULTY ID: M21512
2. TEXT BOOK REFRENCES
• ROBBINS BASIC PATHOLOGY
• HARSH MOHAN TEXTBOOK OF PATHOLOGY
• SELF ASSESSMENT & REVIEW OF PATHOLOGY BY ARVIND ARORA
• TEXTBOOK OF MICROBIOLOGY BY DR C P BAVEJA
• OTHER STANDARD REFRENCES
3. SPECIFIC LEARNING OBJECTIVES
• ROLE OF HLA / MHC IN IMMUNITY
• ROLE OF HLA A,B,D [MHC 1&2] IN IMMUNITY
• TYPES OF TRANSPLANTED GRAFTS
• ALLOGRAFTS
• TYPES OF TRANSPLANT REJECTIONS
• PATHOGENESIS OF SOLID ORGAN REJECTION
• TYPES OF SOLID ORGAN REJECTION
• GRAFT VS HOST DISEASE
• TYPES OF GVHD
• MCQs
4. HLA / MHC
Major Histocompatibility Complex
• MHC is a genetic “LOCUS” on Chromosome 6p, which codes
for cell surface compatibility i.e., they regulate expression of
cell surface antigen
• Also called HLA (Human Leukocyte Antigens) in humans and
H-2 in mice
• It’s major job is to make sure all self cell antigens are
recognized and “tolerated”, because the general rule of the
immune system is that all UN-recognized cells will NOT be
tolerated
5. MHC MOLECULES
(Gene Products)
HLA A & B [MHC 1]
• Expressed on all nucleated cells and platelets on the surface
of the cell,
• It is a glycoprotein & antigenic.
•T8 lymphocytes recognize & interact with it to
become activated & cause cytolysis
• They are involved in graft rejection
6. MHC MOLECULES
(Gene Products)
HLA D [MHC II]
• Expressed on all APC’s, i.e., Langerhans cells, macrophages,
dendritic cells & B lymphocytes on cell surface
• It is a glycoprotein & antigenic
•T4 lymphocytes interact with it and are activated
immunologically
• It is primarily responsible for graft vs host disease
7. TYPES OF GRAFTS [TRANSPLANTS]
• AUTOGRAFT ( autogenic ) – graft from self eg, skin grafting
• ISOGRAFT ( syngraft ) – graft from identical twin
• ALLOGRAFT ( homograft ) - graft from genetically unrelated
member of same species
• XENOGRAFT( heterograft ) – graft from different species
8. ALLOGRAFT
• Allograft is the most commonly performed transplant
procedure
• Main problem of this procedure is rejection of the
transplanted tissue
• Most common transplanted organ is kidney
9. TRANSPLANT REJECTION
Two main types of rejections occur
• GRAFT REJECTION BY HOST seen in solid organ transplant
e.g. kidney
• HOST REJECTION BY GRAFT known as GRAFT Vs HOST
DISEASE ( GVHS ) occurs in hematopoietic tissue transplant
e.g. bone marrow
10. REJECTION OF TRANSPLANT [SOLID ORGAN]
PATHOGENESIS
• PRESENCE OF PREFORMED ANTI DONOR ANTIBODIES
• RECOGNITION OF FOREIGN MHC MOLECULES ON GRAFT BY
HOST IMMUNE SYSTEM
DIRECT RECOGNITION via DONOR MHC
INDIRECT RECOGNITION VIA HOST APC
11. REJECTION OF SOLID ORGAN TRANSPLANT
PREFORMED ANTI DONOR ANTIBODIES
PRESENCE OF PREFORMED ANTI DONOR ANTIBODIES ARE
SEEN IN:
• Pre transfused host
• Multiparous women
• Patient with previously rejected transplant
12. REJECTION OF SOLID ORGAN TRANSPLANT
DIRECT RECOGNITION via DONOR MHC
DIRECT RECOGNITION OF FOREIGN MHC MOLECULES ON
GRAFT BY HOST IMMUNE SYSTEM
DIRECT RECOGNITION – via donor MHC 1 on all nucleated
donor cells
MHC I (HLA-A,B) on donor cells is
• Recognized directly by CD8+TL of host,
• Which are then activated to form cytotoxic T lymphocytes
[CTL],
• Causing apoptosis of donor cells
13. REJECTION OF SOLID ORGAN TRANSPLANT
DIRECT RECOGNITION via DONOR MHC
DIRECT RECOGNITION OF FOREIGN MHC MOLECULES ON
GRAFT BY HOST IMMUNE SYSTEM
DIRECT RECOGNITION – via donor MHC II on all donor antigen
presenting cells
MHC II (HLA-D) on donor APC cells - Directly activate CD4+TL
of host, leading to production of:
• Cytokines and
• Activation of BL to produce antibodies against donor cells
• This causes necrosis & inflammation of donor tissue
14. REJECTION OF SOLID ORGAN TRANSPLANT
INDIRECT RECOGNITION via HOST APC
INDIRECT RECOGNITION OF FOREIGN ANTIGENS ON GRAFT
BY HOST ANTIGEN PRESENTING CELLS
Donor antigens, which are foreign to the host are picked up
by host APC (dendritic cells, macrophages & B Lymphocytes)
• Leading to activation of host immune system
• Especially via CD4+TL, which secrete cytokines & enhance
antibody production
• Leading to necrosis & inflammation of graft tissue
17. REJECTION OF SOLID ORGAN TRANSPLANT
ROLE OF CD 8+ T LYMPHOCYTES
CD8+TL ARE IMMUNOLOGICALLY ACTIVATED TO TRANSFORM
INTO CYTOTOXIC T LYMPHOCYTES, WHICH RESULT IN:
• Apoptosis / necrosis of donor parenchymal cells
• Apoptosis / necrosis vascular endothelium [donor tissue],
leading to
• Thrombosis & ischemia
• All above factors contribute to necrosis of graft i.e., rejection
of graft
18. REJECTION OF SOLID ORGAN TRANSPLANT
ROLE OF CD 4+ T LYMPHOCYTES
CD4+TL ARE IMMUNOLOGICALLY ACTIVATED AND
TRANSFORM INTO VARIOUS SUBSETS LIKE Th 1 & Th 17
Activated Th1 &17 subsets leads to type 4 [delayed type of]
hypersensitivity reaction, as well as activation of B
lymphocytes to produce antibodies
• DTH & PROLONGED DTH lead to inflammation & granuloma
formation
• ANTIBODIES formed against donor vascular endothelium are
most important and lead to type 2&3 hypersensitivity
reactions, which activate complement – inflammation -
19. TYPES OF SOLID ORGAN [KIDNEY] REJECTION
• HYPERACUTE
• ACUTE
• SUBACUTE
• CHRONIC
20. HYPERACUTE REJECTION
• Occurs due to preformed anti donor antibodies in recipient,
rare now due to screening of recipient Abs for donor Ags
• It is seen within minutes of vascular anastomosis
• Kidney is cyanotic, mottled & flaccid, no urine/ few drops of
hemorrhagic fluid may be excreted
• Histology – all vessels show acute fibrinoid necrosis,
precipitate of fibrin & cellular debris is seen in lumen of
blood vessels
21. ACUTE REJECTION
OCCURS WITHIN DAYS DUE TO CELLULAR & HUMORAL
REACTIONS
CELLULAR RECATIONS
CD8+TL & CD4+TL ( DTH ) reaction, leading to
• Endothelitis of glomerular & peritubular capillaries,
• Infiltration by lymphocytes,
• Edema & hemorrhage,
• Necrosis of tubular cells, causing acute renal failure [ARF]
22. ACUTE REJECTION
HUMORAL REACTION
Type 2 &3 hypersensitivity reactions due to anti donor
antibodies, leading to
• ACUTE NECROTIZING VASCULITIS – Ag-Ab complexes
deposited in wall of BV cause
• Necrosis & inflammation, followed by
• Thrombosis & consequent ischemia, which leads to
• Atrophy & necrosis of graft
23. SUB ACUTE REJECTION
More frequently due to Ag-Ab COMPLEX (type III
hypersensitivity reaction) which lead to
• Inflammation &
• Cytokines which cause proliferation of fibroblasts, myocytes
in BVs,
• Narrowing the vascular lumen, leading to ischemia, atrophy
& infarction of graft
24. D/D OF REJECTION
• Cyclosporine toxicity which shows arteriolar hyaline
deposits in renal biopsy, may also present with similar
clinical features & should be considered in D/D of acute
rejection
• Arteriosclerosis is an important D/D of sub acute rejection
& can be distinguished by renal biopsy which shows
presence of complement breakdown products, like C4d in
rejection
25. CHRONIC REJECTION
Appears much later, after many months & years
• It is due to cytokines, which cause
• Proliferation of vascular intimal smooth muscles & increased
extracellular matrix
• Narrowing of lumen of BV – decreased blood flow & slow
ischemia, resulting in
• Atrophy & fibrosis of glomeruli, tubules & interstium, leading
to chronic renal failure[CRF]
26. METHODS OF IMPROVING GRAFT SURVIVAL
• SCREENING RECIPIENT BLOOD FOR PREFORMED DONOR
ANTIBODIES
• HLA MATCHING OF RECIPIENT & DONOR (HLA controls
expression of MHC I & II )
• IMMUNOSUPPRESSIVE THERAPY – main side effects are
infections & tumors
27. GRAFT Vs HOST DISEASE
• IMMUNOCOMPETENT DONOR T LYMPHOCYTES [CD 4&8]
PERCEIVE RECIPIENT (HOST) Ags AS FORGIEN & REACT
• HOST IS IMMUNOCOMPROMISED, NO HOST REACTION TO
DONOR CELLS
[before hematopoietic transplant , host is immune depleted]
28. GRAFT Vs HOST DISEASE
ACUTE GVHD – (days to wks) – epithelial necrosis in gut, skin,
liver
CHRONIC GVHD – (late) characterized by
• Autoimmune diseases
• Immunodeficiency
29. MCQ
HLA-I present on
a)All nucleated cells b) Only on cells of immune system
c) Only on B- cells d) Only on T-cells
Grafting done between genetically different individuals of the
same species is
a)Autograft b) Allograft
c) Isograft d) Xenograft
30. MCQ
Preformed antibodies cause
a) Hyperacute rejection b) Acute rejection
c) Chronic rejection d) Acute humoral rejection
Graft rejection is
a) Cell mediated b) Humoral c) Both
d) none
31. MCQ
Cell responsible for GVHD is
a) Immunocompetent T cell donor
b) Immunocompetent T cell recipient
c) Immunocompetent B cell donor
d) Immunocompetent B cell recipient
32. MCQ
Cyclosporine toxicity, following renal transplant; presents as
a) acute renal failure
b) Chronic renal failure
c) Fibrinoid necrosis
d) Coagulative necrosis
33. MCQ
Type of necrosis seen in transplant rejection is
a) Coagulative necrosis
b) Fat necrosis
c) Fibrinoid necrosis
d) Liquefactive necrosis
34. MCQ
Chronic solid organ transplant rejection is due to
a) Antibodies
b) Cytokines
c) Chemokines
d) Antigens
35. MCQ
MHC II is present on all except
a) Langerhans cell
b) Langhans cell
c) Macrophage
d) Dendritic cell
36. MCQ
Acute renal transplant rejection presents as all, except
a) Glomerulonephritis
b) Pyelonephritis
c) Acute tubular necrosis
d) Interstitial nephritis