Cytokines and T Cell Differentiation

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Questions and Answers

Which transcription factor is specifically activated by IL-4?

  • STAT1
  • STAT4
  • STAT6 (correct)
  • STAT3

Which combination of cytokines is responsible for the activation of TH1 cells?

  • IL-6 and IL-21
  • IL-17 and IL-22
  • IFN-γ and IL-12 (correct)
  • IL-4 and IL-10

What is the function of the transcription factor STAT3 in T helper cell differentiation?

  • Induces TH1 development
  • Activates TH2 cells
  • Facilitates iTreg cell formation
  • Promotes TH17 and TFH cell differentiation (correct)

Which T helper cell subset is induced by the cytokines TGF-β and IL-10?

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

If STAT5 is activated, which T helper cell subset will likely differentiate?

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

Which cytokine is incorrectly paired with its associated T helper cell subset?

<p>IFN-γ - TH17 (A)</p> Signup and view all the answers

What role do cytokines play in T helper cell differentiation?

<p>They activate specific transcription factors. (B)</p> Signup and view all the answers

Which transcription factor is responsible for mediating the effects of IL-6?

<p>STAT3 (D)</p> Signup and view all the answers

Which of the following combinations would most likely lead to a TH2 response?

<p>IL-4 and IL-5 (B)</p> Signup and view all the answers

The differentiation of which T helper cells is most affected by a lack of IL-21?

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

Flashcards

Cytokine

A protein that transmits signals between cells, influencing immune cell development and function.

Transcription Factors

Proteins that bind to DNA and control gene expression, dictating the development of specific T helper cell types.

TH1 Cells

A type of T helper cell that produces IFN-γ and primarily targets intracellular pathogens like viruses and bacteria.

TH2 Cells

A type of T helper cell that produces IL-4, IL-5, and IL-13, and helps fight parasitic infections and allergic responses.

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TH17 Cells

A type of T helper cell that secretes IL-17 and IL-22, promoting inflammation and aiding in the defense against fungal and bacterial infections.

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TFH Cells

A type of T helper cell that produces IL-21 and helps activate B cells to produce antibodies, aiding in humoral immunity.

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iTreg Cells

A type of T helper cell that produces IL-10 and TGF-β, suppressing immune responses and maintaining immune tolerance to prevent autoimmunity.

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Cytokine Pathway

A signaling pathway involving specific cytokines and transcription factors that ultimately leads to the differentiation of a particular T helper cell subset.

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T helper cell Differentiation

The process by which naive T cells develop into specific T helper cell subtypes, each with unique functions in the immune response.

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Signal Transduction

The process of converting a signal from outside the cell, such as a cytokine, into a specific cellular response, involving transcription factors and gene expression.

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Study Notes

Fate-specifying Cytokines

  • Cytokines influence the differentiation of T cells into specific types.
  • IFN-γ and IL-12 lead to the development of TH1 cells.
  • IL-4, IL-5, and IL-13 promote TH2 cell formation.
  • IL-17 and IL-22 drive TH17 cell development.
  • IL-21 fosters TFH cell differentiation.
  • TGF-β and IL-10 result in iTreg cell development.
  • STAT proteins are transcription factors crucial in these pathways.
  • Specific transcription factors like T-bet, GATA-3, RORyt, Bcl-6, and FoxP3 are also essential in these processes.

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