lecture 27- immunology
33 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

In tissue rejection, which route involves donor dendritic cells directly presenting antigens to recipient T cells?

  • Lymph Node Response
  • Recipient APC Route
  • Direct Route (correct)
  • Indirect Route

Which type of MHC molecules are most frequently recognized by alloantibodies generated from alloreactive B cells?

  • Class I MHC
  • Class II MHC (correct)
  • Class III MHC
  • Class IV MHC

What is the prime target of graft vasculature in tissue rejection?

  • Endothelial cells (correct)
  • Smooth muscle cells
  • Epithelial cells
  • Fibroblasts

Which cells capture and process donor alloantigens and then present them to recipient T cells in the indirect pathway of tissue rejection?

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

What is the key function of alloreactive antibodies in tissue rejection?

<p>Activating complement and Fc receptor-mediated mechanisms (B)</p> Signup and view all the answers

Where do antigens presented by both donor and recipient APCs travel to in the rejection process?

<p>Nearest lymph node (A)</p> Signup and view all the answers

Which molecule expressed by endothelial cells serves as a target for graft vasculature in tissue rejection?

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

What is the consequence of alloantibodies recognizing graft antigens in tissue rejection?

<p>Engagement of effector mechanisms like complement and Fc receptors (D)</p> Signup and view all the answers

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

<p>Attacking and 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 transplants?

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

What is the role of alloreactive B cells in response to alloantigens?

<p>Producing antibodies targeting MHC proteins (D)</p> Signup and view all the answers

Which immune cells are responsible for directly attacking and killing graft tissue cells?

<p>CD8+ cytotoxic T cells (B)</p> Signup and view all the answers

How do alloantigen-specific antibodies contribute to tissue rejection?

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

Which component is a prime target for the recipient's immune response in transplant rejection?

<p>Endothelial cells lining blood vessels (D)</p> Signup and view all the answers

What is the ultimate consequence of an attack on the vasculature of transplanted tissue?

<p>Compromised blood flow leading to tissue failure (D)</p> Signup and view all the answers

What effect do antibodies targeting MHC proteins have on the donated tissue?

<p>Exacerbate tissue damage and rejection (D)</p> Signup and view all the answers

What is the main way activated effector T cells contribute to transplant rejection?

<p>Migrating back to the transplanted tissue and engaging in various effector functions (B)</p> Signup and view all the answers

Which pathway involves the recipient dendritic cells capturing and processing donor alloantigens in tissue rejection?

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

What is the primary function of effector T cells in transplant rejection?

<p>Engaging in various effector functions at the transplanted tissue (C)</p> Signup and view all the answers

Which immune cells are primarily involved in the differentiation into effector T cells after antigen presentation in the lymph node response?

<p>Naive T cells (B)</p> Signup and view all the answers

In transplant rejection, what is the direct consequence of donor dendritic cells directly presenting antigens to recipient T cells?

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

What is the crucial function of recipient APCs in the indirect pathway of tissue rejection?

<p>Capturing and processing donor alloantigens for presentation (A)</p> Signup and view all the answers

What is a significant outcome of antigens being presented to naive T cells in the lymph nodes during tissue rejection?

<p>Proliferation and differentiation into effector T cells (A)</p> Signup and view all the answers

How do effector T cells contribute differently from naive T cells to tissue rejection?

<p>Effector T cells migrate back to the transplanted tissue (B)</p> Signup and view all the answers

What role do CD4+ helper T cells play in transplant rejection?

<p>Providing help and coordination of immune responses (B)</p> Signup and view all the answers

Which effector mechanisms can separately or in combination promote allograft rejection?

<p>Alloreactive CD4+ T cells, CD8+ T cells, and alloantibodies (D)</p> Signup and view all the answers

What is the primary function of alloreactive B cells in response to alloantigens?

<p>Production of antibodies targeting MHC proteins (A)</p> Signup and view all the answers

What is the consequence of an attack on the vasculature of transplanted tissue?

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

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

<p>Alloreactive T cells (D)</p> Signup and view all the answers

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

<p>Directly attacking and killing graft tissue cells (C)</p> Signup and view all the answers

How do antibodies produced by alloreactive B cells contribute to tissue rejection?

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

In transplant rejection, what is a prime target for the recipient's immune response?

<p>Endothelial cells in the vasculature of the transplanted tissue (C)</p> Signup and view all the answers

What is crucial for developing strategies to prevent or mitigate rejection and improve transplant outcomes?

<p>Understanding alloreactive T cell activation and antibody production pathways (B)</p> Signup and view all the answers

More Like This

L'alloréactivité indirecte en immunologie
24 questions
Use Quizgecko on...
Browser
Browser