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Differences in the regulation of CD4 and CD8 T-cell clones during immune responses

P C Beverley1, M K Maini

  • 1The Edward Jenner Institute for Vaccine Research, Newbury, Berkshire, UK. peter.beverley@jenner.ac.uk

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|May 4, 2000
PubMed

Insights

This study reveals that CD8 T-cell clones dominate immune responses to Epstein-Barr virus in acute infectious mononucleosis. CD4 T-cell responses are more polyclonal and tightly regulated, suggesting distinct clonal expansion mechanisms.

Area of Science:

  • Immunology
  • Molecular Biology
  • Virology

Background:

  • Lymphocyte clones are the functional units of the immune response.
  • Previous analyses showed similar turnover rates for CD4 and CD8 lymphocytes.
  • New molecular methods enable global analysis of T-cell clones responding to antigens in vivo.

Purpose of the Study:

  • To investigate T-cell clone dynamics during Epstein-Barr virus infection.
  • To compare the clonal expansion of CD4 and CD8 T-cells in response to viral and recall antigens.
  • To understand the regulation of T-cell clonal size and proliferative capacity.

Main Methods:

  • Utilized a modified heteroduplex analysis to track T-cell clones.
  • Analyzed T-cell responses in patients with acute infectious mononucleosis (AIM).
  • Examined responses to Epstein-Barr virus and tetanus toxoid (a soluble recall antigen).

Main Results:

  • Large CD8 T-cell clones were predominantly detected in fresh blood from AIM patients.
  • CD4 T-cell clones responding to tetanus toxoid were only identifiable after in vitro re-stimulation.
  • CD8 T-cell expansion is facilitated by telomerase up-regulation, preventing proliferative exhaustion.

Conclusions:

  • CD8 T-cell responses in AIM are characterized by the expansion of large, specific clones.
  • CD4 T-cell responses appear more polyclonal and exhibit tighter regulation of clone size.
  • Differential regulation of telomerase and other molecular mechanisms likely govern CD4 and CD8 T-cell clonal expansions.

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