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Monoclonal proliferation of CD4+ large granular lymphocytes with cytolytic activity

M Yasukawa1, Y Utsunomiya, Y Inoue

  • 1First Department of Internal Medicine, Ehime University School of Medicine, Japan.

British Journal of Haematology
|October 1, 1995
PubMed

Insights

This study presents a rare case of CD4+ large granular lymphocytes (LGL) exhibiting potent cytotoxic activity. These findings confirm the in vivo existence of perforin-positive CD4+ cytotoxic T lymphocytes (CTL).

Area of Science:

  • Immunology
  • Cellular Biology

Background:

  • Large granular lymphocytes (LGL) are a subset of lymphocytes with cytotoxic capabilities.
  • The role and characteristics of CD4+ LGL, particularly their cytotoxic functions, are areas of ongoing research.

Observation:

  • A rare case of monoclonal proliferation of CD3+4+8- T-cell receptor-alpha beta+ large granular lymphocytes (LGL) was identified.
  • The observed CD4+ LGL demonstrated spontaneous cytotoxicity against herpes simplex virus-infected cells.
  • These cells also exhibited antibody- and lectin-dependent cytotoxicity.

Findings:

  • Perforin, a key mediator of cellular cytotoxicity, was abundantly expressed in the CD4+ LGL.
  • The findings indicate that perforin-positive CD4+ cytotoxic T lymphocytes (CTL) exist in vivo.

Implications:

  • This case provides in vivo evidence supporting recent in vitro studies on CD4+ CTL.
  • Understanding the function of these specific T-cell populations can advance knowledge in cellular immunity and antiviral responses.

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