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Increased levels of soluble CD8 and CD4 in patients with infectious mononucleosis

A Yoneyama1, K Nakahara, M Higashihara

  • 1First Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Japan.

British Journal of Haematology
|January 1, 1995
PubMed

Insights

Plasma levels of soluble CD8 and soluble CD4 increase significantly in infectious mononucleosis (IM), indicating lymphocyte activation. These soluble markers are useful for monitoring immune responses during IM and convalescence.

Area of Science:

  • Immunology
  • Virology

Background:

  • Infectious mononucleosis (IM) is a viral illness primarily caused by Epstein-Barr virus (EBV).
  • Immune system activation, particularly involving CD8+ and CD4+ T lymphocytes, plays a crucial role in controlling EBV infection.

Purpose of the Study:

  • To investigate plasma levels of soluble CD8 (sCD8) and soluble CD4 (sCD4) in patients with IM.
  • To assess the correlation between sCD8 and sCD4 levels and immune cell populations.
  • To determine the utility of sCD8 and sCD4 as biomarkers for immune activation in IM.

Main Methods:

  • Measurement of plasma sCD8 and sCD4 levels in 44 IM patients and controls.
  • Correlation analysis between sCD8/sCD4 levels and CD8+ lymphocyte counts (including CD8+HLA-DR+ cells).
  • In vitro assessment of sCD8 release from lymphocytes.

Main Results:

  • Marked increase in plasma sCD8 and significant increase in sCD4 observed in IM patients compared to controls.
  • sCD8 levels strongly correlated with CD8+ lymphocyte numbers and activation markers (HLA-DR).
  • Elevated sCD8 attributed to both lymphocyte subset expansion and increased release per cell; elevated sCD4 due to increased release without cell number increase.
  • Higher sCD8 and sCD4 levels correlated with more severe fever.
  • sCD8 and sCD4 levels remained elevated during convalescence, suggesting prolonged immune activation.

Conclusions:

  • Plasma sCD8 and sCD4 levels are significantly elevated during infectious mononucleosis.
  • These soluble markers reflect CD8+ and CD4+ lymphocyte activation and are influenced by disease severity.
  • sCD8 and sCD4 show potential as valuable tools for monitoring immune activation in IM patients.

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