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Prostaglandin E2 selectively increases interferon gamma receptor expression on human CD8+ lymphocytes.
1Howard Hughes Medical Institute Laboratory, Baylor College of Medicine, Houston, Texas 77030.
The Journal of Clinical Investigation
|April 1, 1989
Summary
Prostaglandin E2 (PGE2) specifically increases the number of interferon gamma (IFN gamma) receptors on CD8+ cells. This suggests a new way eicosanoids regulate hormone receptors in specific tissues.
Area of Science:
- Immunology
- Molecular Biology
- Endocrinology
Background:
- Prostaglandin E2 (PGE2) and interferon gamma (IFN gamma) are crucial for suppressor cell differentiation.
- The precise mechanism by which PGE2 influences IFN gamma-dependent effects on CD8+ cells remains unclear.
Purpose of the Study:
- To investigate if PGE2 modulates IFN gamma receptor expression on CD8+ cells.
- To determine if PGE2 alters the number or affinity of IFN gamma receptors on CD8+ cells.
Main Methods:
- CD8+ and CD4+ T cells were cultured and their IFN gamma receptor expression analyzed.
- Cells were incubated with PGE2 (10(-8) M) or PGD2 (10(-8) M) to assess effects on IFN gamma receptor number and affinity.
Main Results:
- Both CD8+ and CD4+ cells initially showed similar high-affinity IFN gamma receptors.
- PGE2 treatment significantly increased the number of IFN gamma receptors on CD8+ cells, but not CD4+ cells.
- PGE2 did not alter the binding affinity of IFN gamma receptors on CD8+ cells.
Conclusions:
- PGE2 specifically upregulates IFN gamma receptor expression on CD8+ cells.
- This finding reveals a novel mechanism for eicosanoid action via tissue-specific regulation of hormone receptors.
