lecture 14 true and false quiz- immunology
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Questions and Answers

The IL-2 signaling through its receptor (IL-2R) promotes T cell survival, expansion, and differentiation into regulatory T cells.

False

Costimulatory signals provided by APCs, proinflammatory cytokines, and IL-2 are critical for T cell activation but do not impact proliferation and differentiation into effector T cells.

False

B7 molecules (CD80 and CD86) are expressed on the surface of T cells in response to microbial products and various cytokines.

False

CD28 engagement promotes the production of interleukin-4 (IL-4) and the expression of other cytokines necessary for T cell activation and function.

<p>False</p> Signup and view all the answers

In APC-T cell interactions, B7 molecules interact with the CD28 receptor on APCs to provide essential costimulatory signals.

<p>False</p> Signup and view all the answers

Costimulatory signals are not important for T cell activation.

<p>False</p> Signup and view all the answers

If an APC presents a self-antigen without costimulatory signals, the T cell may become tolerant to the self-antigen.

<p>True</p> Signup and view all the answers

CD28 is a cell surface antigen expressed on T cells that is involved in T cell activation.

<p>True</p> Signup and view all the answers

Activation of APCs by microbial products leads to an increase in the expression of costimulators.

<p>True</p> Signup and view all the answers

Cytokines are not involved in promoting the production of IL-2 by cells.

<p>False</p> Signup and view all the answers

CTLA-4 competes with CD28 for binding to B7 molecules on APCs.

<p>True</p> Signup and view all the answers

CD28-B7 interactions result in the inhibition of T cell activation.

<p>False</p> Signup and view all the answers

PD-1 sends activating signals upon binding to its ligand.

<p>False</p> Signup and view all the answers

B7 molecules are expressed on the surface of T cells in response to microbial products.

<p>False</p> Signup and view all the answers

CD28 engagement promotes the production of interleukin-2 (IL-2) in T cells.

<p>True</p> Signup and view all the answers

Modulation of the B7/CD28 interaction for therapeutic purposes involves enhancing inhibitory signals.

<p>False</p> Signup and view all the answers

CD28 interacts with CD86 (B7.2) on the surface of APCs to provide a crucial second signal for T cell activation.

<p>False</p> Signup and view all the answers

The interaction between B7 molecules and CD28 receptor is essential for T cell activation.

<p>True</p> Signup and view all the answers

Innate immune responses triggered by microbial pathogens do not lead to the upregulation of costimulatory molecules on APCs.

<p>False</p> Signup and view all the answers

Costimulatory blockade interferes with the interaction between MHC complex and T cell receptor.

<p>False</p> Signup and view all the answers

Interleukin-2 (IL-2) promotes the expansion of activated T cells and supports their effector functions.

<p>True</p> Signup and view all the answers

Manipulation of B7/CD28 interaction for therapeutic purposes is only relevant for treating allergies.

<p>False</p> Signup and view all the answers

Costimulatory blockade is approved for the treatment of Rheumatoid Arthritis (RA) and tissue transplant.

<p>True</p> Signup and view all the answers

CD80 and CD86 are downregulated on APCs upon encountering microbial pathogens.

<p>False</p> Signup and view all the answers

Manipulation of B7/CD28 interaction for therapeutic purposes is not relevant in influencing T cell activation.

<p>False</p> Signup and view all the answers

IL-2 primarily acts in an autocrine manner to stimulate the proliferation and differentiation of T cells.

<p>True</p> Signup and view all the answers

Surrogate Light Chain Transition is a crucial step in the activation and proliferation of T cells.

<p>False</p> Signup and view all the answers

Costimulatory signals provided by APCs and IL-2 are sufficient for T cell activation but not for proliferation and differentiation.

<p>False</p> Signup and view all the answers

Manipulation of B7/CD28 interaction for therapeutic purposes is not related to regulating immune responses against pathogens.

<p>False</p> Signup and view all the answers

The expression of costimulators in APC-T cell interactions is not influenced by microbial products and cytokines.

<p>False</p> Signup and view all the answers

Costimulatory signals are not crucial for T cell activation according to the text.

<p>False</p> Signup and view all the answers

In the absence of costimulatory signals, T cell activation may occur normally.

<p>False</p> Signup and view all the answers

CD28 is not a key costimulatory molecule involved in T cell activation according to the text.

<p>False</p> Signup and view all the answers

CD28 interacts with CD86 (B7.2) on the surface of APCs to provide a crucial second signal for T cell activation.

<p>True</p> Signup and view all the answers

The presence of costimulatory signals like CD28-B7 interactions does not impact whether a T cell becomes activated or tolerant to the antigen presented by the APC.

<p>False</p> Signup and view all the answers

B7 molecules are not expressed on the surface of APCs in response to microbial products and various cytokines.

<p>False</p> Signup and view all the answers

Manipulation of B7/CD28 interaction for therapeutic purposes is not discussed in the text.

<p>False</p> Signup and view all the answers

Surrogate light chain transition is unrelated to the regulation of immune responses.

<p>True</p> Signup and view all the answers

Allelic exclusion plays a critical role in modulating immune responses according to the text.

<p>True</p> Signup and view all the answers

Activation of Light Chain Recombination is essential for the differentiation into regulatory T cells.

<p>False</p> Signup and view all the answers

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