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Related Experiment Videos

Phenotypic changes in a CD4+ lymphocyte subset correlate with a conversion from suppressor to helper inducer

A M Nesbitt1, D B Jones, K Moore

  • 1University Department of Pathology, Southampton General Hospital, U.K.

Immunology
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

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CD4+ lymphocytes differentiate from suppressor to helper-inducer cells. This functional conversion occurs when CD4+/WR16+/WR19- suppressor cells are exposed to antigens or mitogens, changing their phenotype to CD4+/WR16-/WR19+.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • CD4+ lymphocytes play crucial roles in immune responses.
  • Distinct subsets of CD4+ lymphocytes possess unique functions, including helper-inducer and suppressor activities.

Purpose of the Study:

  • To investigate the functional plasticity of CD4+ lymphocyte subsets.
  • To identify the phenotypic and functional changes associated with T-cell activation.

Main Methods:

  • Negative selection using monoclonal antibodies WR16 (CD45RA) and WR19 to isolate CD4+ lymphocyte subsets.
  • Functional assays, including pokeweed mitogen (PWM)-driven Ig secretion, to assess helper-inducer and suppressor activities.
  • Phenotypic analysis by flow cytometry to monitor antigen expression (WR16 and WR19) after stimulation with phytohaemagglutinin (PHA) or purified protein derivative (PPD).

Related Experiment Videos

Main Results:

  • Two reciprocal CD4+ lymphocyte subsets were isolated: CD4+/WR16-/WR19+ (helper-inducer) and CD4+/WR16+/WR19- (suppressor).
  • Exposure of CD4+/WR16+/WR19- suppressor cells to PHA or PPD induced a phenotypic shift to CD4+/WR16-/WR19+.
  • This phenotypic change correlated with a functional conversion from suppressor to helper-inducer activity.

Conclusions:

  • The CD4+/WR16+/WR19- suppressor subset contains cells capable of differentiating into CD4+/WR16-/WR19+ helper-inducer cells.
  • Antigen or mitogen exposure triggers this differentiation and functional plasticity within CD4+ lymphocytes.
  • These findings reveal a dynamic interconversion between T-cell subsets, impacting immune regulation.