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Aging effects on T-bet expression in human B cell subsets.

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T-bet and CD11c expression in human B cells differs with age and stimulation. Elderly individuals show increased T-bet and CD11c upon TLR7 stimulation, particularly in specific B cell subsets.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • T-bet is a transcription factor crucial for B cell differentiation.
  • CD11c is a marker expressed on certain B cell subsets, implicated in aging and autoimmunity.
  • Understanding age-related changes in B cell subsets is vital for immune health.

Purpose of the Study:

  • To compare T-bet and CD11c expression in human B cell subsets across different age groups.
  • To investigate the impact of Toll-like receptor 7 (TLR7) stimulation on these markers.

Main Methods:

  • Flow cytometry was used to analyze T-bet and CD11c expression.
  • Human B cell subsets from young and elderly individuals were examined.
  • Cells were analyzed both unstimulated and after TLR7 stimulation.

Main Results:

  • T-bet was higher in memory than naïve B cells, and more abundant in younger individuals.
  • TLR7 stimulation upregulated T-bet in all subsets, with a greater fold-increase in the elderly, especially in class-switching subsets (naïve and IgM).
  • CD11c expression was higher in memory B cells but showed no age difference initially; however, TLR7 stimulation increased CD11c in elderly B cell subsets.

Conclusions:

  • Age and TLR7 stimulation significantly modulate T-bet and CD11c expression in human B cells.
  • Elderly individuals exhibit distinct B cell responses to TLR7 stimulation, with implications for immune function and potential autoimmunity.