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Intracellular Casp8p41 content is inversely associated with CD4 T cell count

Nathan W Cummins1, Wei Jiang, John McGinty

  • 1Division of Infectious Diseases, Mayo Clinic, Rochester, Minnesota 55905, USA.

The Journal of Infectious Diseases
|June 23, 2010
PubMed

Insights

Caspase-8 fragment 41 (Casp8p41) levels correlate with CD4 T cell counts in HIV infection. Higher Casp8p41 indicates lower CD4 counts, suggesting its role in T cell loss during HIV.

Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Human immunodeficiency virus (HIV) infection leads to a decline in CD4 T cells, a hallmark of disease progression.
  • The precise mechanisms driving CD4 T cell depletion in HIV remain incompletely understood.
  • Caspase-8 is a key initiator of apoptosis, and its cleavage products may play a role in immune cell death.

Purpose of the Study:

  • To investigate the role of Caspase-8 fragment 41 (Casp8p41), a product of procaspase 8 cleavage by HIV protease, in HIV infection.
  • To determine the association between Casp8p41 levels and CD4 T cell counts in individuals with HIV.
  • To evaluate Casp8p41 as a potential biomarker for CD4 T cell loss in HIV.

Main Methods:

  • Measurement of Casp8p41 protein fragment levels in memory CD4 T cells from individuals with HIV.
  • Cross-sectional and longitudinal analysis of the correlation between Casp8p41 content and absolute CD4 T cell counts.
  • Comparison of Casp8p41 change as a predictor of CD4 T cell count change against other established markers like viral load and activated CD8 T cells.

Main Results:

  • Casp8p41 content was inversely correlated with CD4 T cell count.
  • Changes in Casp8p41 levels over time were significantly associated with changes in absolute CD4 T cell counts.
  • The predictive power of Casp8p41 change for CD4 T cell count decline was comparable to bacterial 16s DNA levels and superior to viral load or activated CD8 T cell percentage.

Conclusions:

  • Casp8p41 is a relevant mediator of CD4 T cell death during HIV infection.
  • Elevated Casp8p41 levels may signify increased apoptotic activity and contribute to the immunodeficiency observed in HIV.
  • Casp8p41 warrants further investigation as a potential therapeutic target or prognostic biomarker in HIV management.

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