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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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.
Naive T cells that have not yet encountered an antigen express two primary CD...

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Mental stimulation increases circulating CD4-positive T lymphocytes: a preliminary study.

M C Diamond1, J Weidner, P Schow

  • 1Department of Integrative Biology, 3060 Valley Life Sciences Building, University of California, Berkeley, CA 94720-3140, USA. diamond@socrates.berkeley.edu

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Playing contract bridge increased CD4-positive T lymphocytes in healthy women. This finding may relate to immune-incompetent mice showing reduced frontal cortex thickness, which thymic transplants can reverse.

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Area of Science:

  • Neuroscience
  • Immunology
  • Cognitive Psychology

Background:

  • The dorsolateral frontal cortex plays a role in cognitive functions.
  • Immune system deficiencies can impact neurological health.

Purpose of the Study:

  • To investigate the effect of cognitive stimulation on immune cell counts.
  • To explore the relationship between frontal cortex integrity and immune function.

Main Methods:

  • 12 healthy adult females played contract bridge for 1.5 hours.
  • Blood samples were analyzed using flow cytometry to count CD4-positive T lymphocytes.
  • Cortical thickness was measured in immune-incompetent mice.

Main Results:

  • A significant increase in CD4-positive T lymphocytes was observed after playing bridge.
  • Immune-incompetent mice exhibited reduced dorsolateral frontal cortical thickness.
  • Thymic transplants in mice reversed both cortical thinning and low CD4-positive cell counts.

Conclusions:

  • Cognitive engagement, like playing bridge, may positively influence immune cell populations.
  • Frontal cortex health is linked to immune competence, as suggested by mouse models.
  • Further research is warranted to understand the neuro-immune interactions.