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Related Experiment Videos

Altered memory B-cell homeostasis in human aging.

Eyal Breitbart1, Xiaowei Wang, Lynette S Leka

  • 1Department of Biochemistry, Tufts University School of Medicine, and the Sackler School of Graduate Biomedical Sciences, Boston, Massachusetts 02111, USA.

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
|July 30, 2002
PubMed
Summary
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Aging adults often exhibit reduced memory B cells, with significant individual variation. This decline may indicate immune senescence and reflect underlying T-cell function changes.

Area of Science:

  • Immunology
  • Gerontology
  • Cell Biology

Background:

  • Age-associated immune system changes include alterations in immunoglobulin repertoires.
  • Variability in mutated immunoglobulin genes suggests potential changes in B-cell populations.

Purpose of the Study:

  • To investigate if variability in mutated immunoglobulin genes reflects changes in memory B-cell numbers in aging adults.
  • To assess memory B-cell counts in healthy elderly individuals, nursing home residents, and young adults.

Main Methods:

  • Quantification of circulating memory B cells in three distinct cohorts: healthy elderly subjects, nursing home residents, and healthy young adults.
  • Analysis of memory B-cell percentages and absolute concentrations relative to total B cells and T-cell concentrations.

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Main Results:

  • A significant proportion of older adults displayed low memory B-cell percentages and absolute concentrations.
  • Memory B-cell values showed a much wider range in older adults compared to younger adults.
  • Memory B-cell concentration correlated positively with memory T-cell concentration but inversely with T-cell responses to mitogens.

Conclusions:

  • Low memory B-cell counts in older adults may represent individual rates of immune senescence.
  • Memory B-cell levels could serve as a sensitive marker for underlying T-cell function in aging.
  • Findings highlight significant heterogeneity in immune aging, particularly concerning B-cell populations.