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Apoptotic human lymphocytes have diminished CD4 and CD8 receptor expression.
A Potter1, C Kim, K A Gollahon
1Department of Pathology, University of Washington, Seattle, Washington, 98195, USA.
Cellular Immunology
|April 15, 1999
Summary
Human T lymphocyte apoptosis commonly reduces CD4 and CD8 surface receptor expression. Quantitative flow cytometry revealed decreased CD4(+) and CD8(+) cells as apoptosis increased across various stimuli.
Area of Science:
- Immunology
- Cell Biology
Background:
- Apoptosis, or programmed cell death, is a critical biological process.
- Understanding lymphocyte apoptosis is vital for immune system regulation and disease research.
Purpose of the Study:
- To investigate changes in CD4 and CD8 surface receptor expression during human T lymphocyte apoptosis.
- To determine if reduced receptor expression is a common feature across diverse apoptotic stimuli.
Main Methods:
- Quantitative multiparameter flow cytometry was employed.
- Human peripheral blood mononuclear cells (PBMC) were subjected to various apoptosis-inducing treatments.
- Lymphocyte subsets were immunophenotyped, and viable, apoptotic, and necrotic cells were quantified.
Main Results:
- CD4(+) and CD8(+) T cells were significantly underrepresented in apoptotic PBMC populations.
- The percentage of CD4(+) and CD8(+) PBMC decreased markedly with increasing apoptosis.
- Direct observation of sorted CD4(+) PBMC confirmed reduced surface receptor expression.
Conclusions:
- Diminished CD4 and CD8 surface receptor expression is a consistent hallmark of human T lymphocyte apoptosis.
- This finding holds true across a wide spectrum of apoptotic stimuli, indicating a conserved mechanism.