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Senescence of T cells: a potential consequence of the Maillard reaction?

R A Miller1

  • 1Department of Pathology, Boston University School of Medicine, MA 02118.

Progress in Clinical and Biological Research
|January 1, 1989
PubMed

Insights

Older mice exhibit heterogeneous T cell populations, with longer-lived T cells (PGP-1hi) showing reduced responsiveness. This suggests nonenzymatic glycosylation of stable components in these long-lived T cells may impair immune function.

Area of Science:

  • Immunology
  • Gerontology
  • Cell Biology

Background:

  • The aging immune system (immunosenescence) is characterized by a heterogeneous mix of T cells with varying lifespans and functions.
  • Defects in T cell activation, including calcium signaling and oncogene expression, are linked to immunosenescence.
  • The PGP-1 surface glycoprotein identifies longer-lived T cell subpopulations in aging mice.

Purpose of the Study:

  • To investigate the relationship between T cell lifespan, PGP-1 expression, and T cell responsiveness to mitogens in aging mice.
  • To explore the hypothesis that nonenzymatic glycosylation of stable components in long-lived T cells contributes to impaired immune function.

Main Methods:

  • Analysis of T cell populations in old mice using antibodies against the PGP-1 surface glycoprotein.
  • Assessment of T cell responsiveness to activating mitogens.
  • Investigation of potential molecular mechanisms, such as nonenzymatic glycosylation, in long-lived T cells.

Main Results:

  • A higher proportion of longer-lived T cells (PGP-1hi) was observed in older mice.
  • The PGP-1hi T cell subpopulation demonstrated significantly reduced responsiveness to mitogens compared to other T cells.
  • This suggests a correlation between T cell longevity, PGP-1 expression, and diminished immune function.

Conclusions:

  • The PGP-1hi T cell subpopulation represents a functionally impaired subset in aged mice.
  • Nonenzymatic glycosylation of stable cellular components is a plausible mechanism underlying the poor T cell function in long-lived T cells.
  • Understanding these mechanisms is crucial for addressing age-related immune decline.

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