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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 human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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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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Updated: Oct 4, 2025

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T Cell Responses to the Microbiota.

Ivaylo I Ivanov1, Timur Tuganbaev2, Ashwin N Skelly3

  • 1Department of Microbiology and Immunology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA;

Annual Review of Immunology
|February 3, 2022
PubMed
Summary
This summary is machine-generated.

T cells recognize microbes with varying resolution, influencing immune responses beyond inflammation. Harnessing T cell plasticity with microbiota pathways can improve human health.

Keywords:
MAIT cellsTh17 cellsTregsdendritic cellsenteric nervous systemintestinal microbiotasegmented filamentous bacteriaγδ T cells

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Area of Science:

  • Immunology
  • Microbiology
  • Systems Biology

Background:

  • The immune system and microbes have coevolved, shaping intricate communication networks.
  • T cells provide a broad range of microbial recognition capabilities, from broad detection to specific antigen identification.

Purpose of the Study:

  • To review T cell-microbe interactions within the gut.
  • To frame these interactions within an algorithmic model of recognition, interpretation, and response.
  • To explore the potential for manipulating T cell responses for health benefits.

Main Methods:

  • Review of existing literature on T cell-microbe interactions in the gut.
  • Conceptual framework development for understanding microbial recognition resolution.
  • Analysis of T cell plasticity and microbiota-controlled pathways.

Main Results:

  • Microbial recognition by T cells triggers diverse immune responses, not limited to inflammation.
  • An algorithmic framework can describe the multi-level recognition, interpretation, and response circuits.
  • T cell responses are malleable and influenced by the gut microbiota.

Conclusions:

  • The gut microbiota significantly shapes T cell immunity.
  • Understanding T cell-microbe interactions offers therapeutic opportunities.
  • Targeting microbiota-controlled pathways can modulate T cell function to promote health.