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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Multifaceted control of T cell differentiation by STIM1.

Scott Gross1, Lauren Womer1, Dietmar J Kappes2

  • 1Fels Cancer Institute for Personalized Medicine, Lewis Katz School of Medicine at Temple University, Philadelphia, PA, 19140, USA.

Trends in Biochemical Sciences
|September 11, 2023
PubMed
Summary

Stromal interaction molecule (STIM) and Orai proteins regulate T cell activation and differentiation by controlling calcium (Ca2+) signals. Their precise roles in T cell development and function are areas of ongoing research.

Keywords:
STIM1T cellscalciumdifferentiationmitochondria

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Area of Science:

  • Immunology
  • Cell Biology
  • Calcium Signaling

Background:

  • Stromal interaction molecule (STIM) and Orai proteins are essential for T cell activation and differentiation.
  • Their roles in T cell development are less understood, despite the known requirement for calcium signals.

Purpose of the Study:

  • To review novel STIM-dependent mechanisms controlling Ca2+ signals during T cell activation.
  • To explore the impact of these mechanisms on mitochondrial function and transcriptional activation.
  • To identify knowledge gaps and future research directions in T cell signaling.

Main Methods:

  • Review of existing literature on STIM, Orai, and T cell signaling.
  • Focus on STIM-dependent calcium signaling pathways.
  • Discussion of related proteins like PMCA and POST.

Main Results:

  • STIM and Orai are critical for T cell activation, differentiation, and function.
  • STIM-dependent Ca2+ signals influence mitochondrial function and gene transcription.
  • The independence of T cell development from STIM/Orai remains a significant knowledge gap.

Conclusions:

  • STIM-dependent calcium signaling is crucial for T cell activation and function.
  • Further research is needed on the roles of PMCA, POST, and the developmental independence from STIM/Orai.
  • Resolving these questions will advance the field of T cell immunology.