lecture 26- immunology

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Questions and Answers

What is the primary reason for the rejection of transplanted tissue?

  • Inflammation
  • DAMPs
  • Alloantigens (correct)
  • Ischemic damage

Which molecules are described as the most important alloantigens responsible for strong and rapid transplant rejection?

  • Polymorphic genes
  • MHC molecules (correct)
  • DAMPs
  • Proteins

Why do most alloantigens differ among individuals?

  • Codominance of polymorphic genes (correct)
  • Due to ischemic damage
  • Because of DAMPs
  • Inflammatory response

How are host T cells (alloreactive T cells) described in relation to recognizing alloantigens?

<p>They indirectly recognize alloantigens (A)</p> Signup and view all the answers

What triggers the cellular and humoral immune responses in the recipient's immune system?

<p>Alloantigens (A)</p> Signup and view all the answers

What is the prime target of graft vasculature for alloreactive antibodies?

<p>Endothelial cells (C)</p> Signup and view all the answers

What is the primary role of the adaptive immune system in responding to transplanted tissue?

<p>Attack grafted tissue (B)</p> Signup and view all the answers

Which immune system plays a critical but not primary role in responding to grafts?

<p>Innate immune system (B)</p> Signup and view all the answers

In the direct pathway of alloreactive T cell activation, which cells present alloantigens directly to host T cells?

<p>Donor dendritic cells (C)</p> Signup and view all the answers

How do host and donor cells contribute to innate immune responses to grafts?

<p>Directly kill donor cells (C)</p> Signup and view all the answers

What is the main effector function engaged by alloreactive antibodies?

<p>Complement activation (C)</p> Signup and view all the answers

Which MHC molecules are most frequently recognized by alloantibodies?

<p>Donor Class I MHC molecules (B)</p> Signup and view all the answers

What initiates ischemic damage in grafts?

<p>Reduced blood and oxygen supply (B)</p> Signup and view all the answers

Which immune responses are discussed in relation to the initial reactions of the recipient's immune system to transplanted tissue?

<p>Activation of alloreactive T cells (B)</p> Signup and view all the answers

What is the process where host dendritic cells take up and process donor MHC molecules, presenting peptides to host T cells?

<p>Indirect pathway (C)</p> Signup and view all the answers

What is the primary focus of the lecture content on transplantation vocabulary?

<p>Defining terms related to transplantation in the medical context (D)</p> Signup and view all the answers

Which term describes tissues or organs transplanted between genetically different individuals of the same species?

<p>Allogeneic Graft (Allograft) (C)</p> Signup and view all the answers

What do allogeneic antigens refer to in the context of transplantation?

<p>Molecules recognized as foreign in the allograft (D)</p> Signup and view all the answers

How do host T cells recognize alloantigens through direct mechanisms?

<p>By directly binding to specific molecules on the graft (A)</p> Signup and view all the answers

What is the main outcome of molecules being recognized as foreign in an allograft?

<p>Inducing an immune response in the recipient (C)</p> Signup and view all the answers

What is the primary role of CD8+ cytotoxic T cells in transplant rejection?

<p>Directly killing graft tissue cells presenting alloantigens (A)</p> Signup and view all the answers

How do CD4+ helper T cells contribute to tissue rejection in transplantation?

<p>Inducing inflammation and cytokine production (C)</p> Signup and view all the answers

Which effector mechanisms target the vasculature of transplanted tissue?

<p>Alloantigen-specific antibodies (B)</p> Signup and view all the answers

What is the consequence of damage to the graft vasculature in a transplant?

<p>Compromised blood flow to the transplanted tissue (B)</p> Signup and view all the answers

What is the main outcome of sensitization in transplantation immunology?

<p>Proliferation of alloreactive T cells (B)</p> Signup and view all the answers

What is the significance of MHC proteins in allorecognition?

<p>They are the primary alloantigens recognized by host T cells. (B)</p> Signup and view all the answers

How do effector CTLs contribute to graft rejection?

<p>By recognizing and killing graft tissue cells presenting alloantigens. (A)</p> Signup and view all the answers

What is the outcome of direct recognition of alloantigens by host T cells?

<p>Activation of immune responses targeting and eliminating transplanted tissue. (A)</p> Signup and view all the answers

Why does mismatch between donor and recipient MHC proteins increase the likelihood of graft rejection?

<p>It increases the likelihood of alloreactive T cell responses, leading to graft rejection. (C)</p> Signup and view all the answers

What role does direct presentation of alloantigens by donor dendritic cells to host T cells play in immunity?

<p>It bypasses the need for antigen processing by host APCs. (A)</p> Signup and view all the answers

What is the primary focus of transplantation immunology?

<p>Understanding how the immune system responds to grafted tissues (C)</p> Signup and view all the answers

What distinguishes fundamental questions from clinical/applied questions in transplantation immunology?

<p>Fundamental questions focus on understanding immune responses. (B)</p> Signup and view all the answers

In transplantation immunology, why is distinguishing between 'self' and 'foreign' important?

<p>To improve transplant success rates (D)</p> Signup and view all the answers

What area does clinical or applied questions in transplantation immunology primarily aim to address?

<p>Preventing rejection and improving transplant success rates (B)</p> Signup and view all the answers

How do host T cells recognize alloantigens in the context of transplantation?

<p>Through direct and indirect mechanisms (D)</p> Signup and view all the answers

What is the main goal of understanding how the immune system recognizes transplanted tissues?

<p>To prevent graft rejection and improve transplant success (B)</p> Signup and view all the answers

What role do alloreactive T cells play in recognizing alloantigens during transplantation?

<p>Identifying alloantigens through direct and indirect mechanisms (D)</p> Signup and view all the answers

Why is it important to understand recognition and rejection mechanisms in transplantation?

<p>To control immune response and improve transplant success rates (B)</p> Signup and view all the answers

What is the main target of alloreactive B cells activation in transplantation immunology?

<p>Graft antigens (B)</p> Signup and view all the answers

In transplantation immunology, which route involves donor dendritic cells presenting antigens directly to recipient T cells?

<p>Direct Route (B)</p> Signup and view all the answers

What is the primary role of recipient dendritic cells in the indirect pathway of alloantigen recognition?

<p>Capture and process donor alloantigens (C)</p> Signup and view all the answers

Endothelial cells expressing Class I MHC are a prime target for what mechanism in transplantation immunology?

<p>Alloantibodies recognition (D)</p> Signup and view all the answers

What is the key role of lymph nodes in the immune response in transplantation immunology?

<p>Travel of APCs carrying antigens (D)</p> Signup and view all the answers

Which mechanism do alloreactive antibodies engage through in response to allograft recognition?

<p>Fc receptor-mediated pathways (C)</p> Signup and view all the answers

In allograft rejection, what contributes significantly to the recognition of graft antigens?

<p>Donor MHC molecules (A)</p> Signup and view all the answers

What is the key difference between the direct and indirect pathways in transplantation immunology?

<p>Source of APCs presenting antigens (C)</p> Signup and view all the answers

What is the primary role of CD8+ cytotoxic T cells in the rejection of transplanted tissue?

<p>Attacking and killing graft tissue cells presenting alloantigens (D)</p> Signup and view all the answers

What effector functions do CD8+ cytotoxic T cells primarily engage in?

<p>Attacking and killing graft tissue cells presenting alloantigens (D)</p> Signup and view all the answers

How do CD4+ helper T cells contribute to tissue damage in transplantation?

<p>Inducing inflammation and cytokine production (C)</p> Signup and view all the answers

Which immune cells are primarily involved in recruiting complement proteins and contributing to tissue damage?

<p>Alloreactive B cells (A)</p> Signup and view all the answers

What is the main target of alloantibodies in the context of transplant rejection?

<p>Vasculature of the transplanted tissue (B)</p> Signup and view all the answers

How do alloreactive B cells exacerbate tissue damage in transplant rejection?

<p>Recruiting complement proteins and immune cells (B)</p> Signup and view all the answers

Which cell type plays a crucial role in orchestrating an immune response against transplanted tissue?

<p>CD4+ helper T cells (C)</p> Signup and view all the answers

In transplantation, what is the primary function of alloreactive T cells?

<p>Engaging in various effector functions (D)</p> Signup and view all the answers

What is a significant consequence of damage to the vasculature of transplanted tissue?

<p>Compromising blood flow to the transplanted tissue (D)</p> Signup and view all the answers

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