Effect of PGE2 on the cell surface molecule expression in PMA treated thymocytes
| Autor: | Norbert Gualde, Dominique Vaillier, Jean-Claude Carron, Richard Daculsi |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
CD3 Complex
Surface Properties CD8 Antigens T-Lymphocytes CD3 Immunology Thymus Gland Dinoprost Dinoprostone Mice chemistry.chemical_compound Antigens CD medicine Animals Immunology and Allergy Protein kinase A Cyclic GMP Cells Cultured Protein kinase C Bucladesine biology Prostaglandin D2 Flow Cytometry Cell biology Mice Inbred C57BL Thymocyte chemistry Tetradecanoylphorbol Acetate CD4 Antigens Phorbol biology.protein Female lipids (amino acids peptides and proteins) CD8 medicine.drug |
| Zdroj: | Immunology Letters. 60:81-88 |
| ISSN: | 0165-2478 |
| Popis: | PGE2 is produced by cells of the thymic microenvironment. The effects of PGE2 are mediated by cAMP through binding to its intracellular receptor protein kinase A (PKA). Phorbol 12-myristate 13-acetate (PMA) is known to modulate CD molecule expression on thymocytes, probably through activation of protein kinase C (PKC). We have hypothesized that cross-talk between these two signalling pathways may affect modulation of the CD molecules on the cell surface of thymocytes. For this purpose, we compare the effects of PMA alone or combined with PGE2 on CD3, CD4 and CD8 expression on mouse thymocytes by flow-cytometric analysis. PMA treatment almost completely abolished CD4 expression and slightly decreased CD3 and CD8 expression. PGE2 alone did not change the CD3, CD4 and CD8 molecule expression. Combined with PMA, PGE2 can overcome the decrease induced by PMA of the CD3 expression and partially reduced the disappearance of the CD4 molecule. On the other hand PGE2 accelerated the loss of CD8 molecule expression. These events occurred only in CD4+ CD8+ immature thymocytes. An analogue of cAMP (dibutyryl cAMP) mimics the effect of PGE2, but not Br-cGMP. This differential regulation by PGE2 of the CD molecule expression on immature thymocytes may provide additional evidence on the role of PGE2 during the process of thymic differentiation. |
| Databáze: | OpenAIRE |
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