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Related Experiment Videos

Interleukin-10-induced CD8 cell proliferation.

A W Rowbottom1, M A Lepper, R J Garland

  • 1Department of Pathology and Microbiology, University of Bristol,UK

Immunology
|September 1, 1999
PubMed
Summary
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Interleukin-10 (IL-10) inhibits T-cell proliferation but can induce CD8+ T cells with Tc2 cytokine profiles. This suggests IL-10 influences immune cell differentiation and function.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Interleukin-10 (IL-10) is a cytokine produced by T helper 2 (Th2) lymphocytes.
  • IL-10 regulates lymphoid and myeloid cells, inhibiting T-cell proliferation and IL-2 production.
  • The cellular microenvironment, including cytokines like IL-10, IFN-gamma, and IL-2, dictates cell-mediated immune responses.

Purpose of the Study:

  • To investigate the effects of recombinant human IL-10 (rhIL-10) on human peripheral blood mononuclear cells (PBMCs).
  • To determine if rhIL-10 influences the emergence of specific immune cell populations.
  • To elucidate the mechanism of rhIL-10 action on CD8+ T cells.

Main Methods:

  • Stimulation of human PBMCs in vitro with varying doses of rhIL-10.
  • Incubation of cells with rhIL-10 before and during activation with anti-CD3 antibody.

Related Experiment Videos

  • Analysis of CD8+ T cell populations and their cytokine production.
  • Investigation of rhIL-10's direct action on purified CD8+ T cells.

    • Main Results:

    • rhIL-10 exhibited a dose-dependent inhibitory effect on PBMCs not previously exposed to it.
    • High doses of rhIL-10 induced the emergence of CD8+ T cells, even after washing cells prior to activation.
    • The effect was mediated directly by rhIL-10 on CD8+ T cells, not CD4+ T cells or monocytes.
    • This phenomenon was observed only with anti-CD3 antibody activation, suggesting involvement of cell-surface receptors.
    • CD8+ clones produced Tc2 cytokines and showed reduced cytotoxicity against various targets.

    Conclusions:

    • rhIL-10 can directly induce a CD8+ T cell population with specific functional characteristics.
    • The findings suggest a novel role for IL-10 in immune cell differentiation beyond its known inhibitory functions.
    • IL-10's impact on CD8+ T cell development is dependent on the activation method, highlighting receptor-mediated signaling.