Related Experiment Videos
Mitogen-induced modulation of CD3, CD4, and CD8(1).
1Immunology Branch, Division of AIDS, National Center for Infectious Diseases, Centers for Disease Control and Prevention (CDC), U.S. Public Health Service, Department of Health and Human Services, Atlanta, Georgia, USA. JMJ1@cdc.gov
Human Immunology
|February 26, 2000
Summary
This study reveals how T-cell receptor-directed mitogens rapidly alter CD3, CD4, and CD8 expression. These changes, involving both surface and cytoplasmic levels, suggest molecule degradation or retention, impacting T-cell regulation.
Area of Science:
- Immunology
- Molecular Biology
- Cellular Signaling
Background:
- The direct interaction between CD3 and coreceptors CD4/CD8 remains unclear.
- Regulation and interregulation of CD3, CD4, and CD8 expression are not fully understood.
Purpose of the Study:
- To investigate the modulation of surface and cytoplasmic CD3, CD4, and CD8.
- To explore the effects of T-cell receptor-directed mitogens on these molecules.
Main Methods:
- Human peripheral blood lymphocytes were stimulated in vitro with phytohemagglutinin (PHA), concanavalin A (ConA), and anti-CD3 monoclonal antibody (alphaCD3).
- Multiparameter flow cytometry was used to analyze surface (sur) and cytoplasmic (c) CD3, CD4, and CD8 expression.
Main Results:
- AlphaCD3 induced rapid decline in surCD3 and delayed decline in cCD3, surCD4, cCD4, and surCD8.
- PHA increased surCD8 and cCD8 expression, while ConA rapidly affected CD3, CD4, and CD8, with delayed effects on surCD8.
- Observed changes suggest degradation or retention rather than shedding or increased production.
Conclusions:
- Different mitogens exert distinct temporal effects on CD3, CD4, and CD8 expression.
- Modulation involves both surface and cytoplasmic antigen levels.
- Findings suggest potential direct interactions between CD4/CD8 and CD3, or interregulation of their expression.