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The immunoregulatory effects of homocysteine and its intermediates on T-lymphocyte function

Harry Dawson1, Gary Collins, Robert Pyle

  • 1Laboratory of Immunology, Clinical Immunology Section, Gerontology Research Center, National Institute on Aging, NIH, 5600 Nathan Shock Drive, Baltimore, MD 21224, USA.

Mechanisms of Ageing and Development
|March 24, 2004
PubMed

Insights

High homocysteine (Hcy) levels activate T cells, influencing immune function and cell death. This research explores Hcy

Area of Science:

  • Immunology
  • Biochemistry
  • Cardiovascular Science

Background:

  • Elevated homocysteine (Hcy) is linked to cardiovascular and cerebrovascular diseases, and mortality.
  • The pathological role of Hcy and its impact on immune function remain unclear.
  • Folic acid and vitamin B12 deficiencies affect immune function and DNA methylation, but Hcy's role is undescribed.

Purpose of the Study:

  • To investigate the effects of homocysteine (Hcy) and its derivatives on T cell activation, differentiation, and viability.
  • To elucidate the specific mechanisms by which Hcy influences immune responses.

Main Methods:

  • In vitro examination of Hcy and its derivatives on T cell cultures.
  • Assays to measure T cell activation, differentiation markers, cell viability, and apoptosis.

Main Results:

  • Homocysteine (Hcy) acts as a potent, concentration-dependent T cell activator.
  • Hcy promotes T cell activation and differentiation.
  • Hcy potentiates activation-induced cell death (AICD) and apoptosis in T cells.

Conclusions:

  • Homocysteine (Hcy) significantly impacts immune function, affecting T cell activation, differentiation, and survival.
  • These findings suggest Hcy may contribute to age-related immune dysfunction and disease pathology.
  • Further research is needed to fully understand Hcy's role in immune-related diseases.

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