| Autor: |
Klein, B, Chaintreuil, J, Crastes de Paulet, A, Serrou, B |
| Jazyk: |
angličtina |
| Rok vydání: |
1983 |
| Předmět: |
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| Popis: |
This study evaluated the action of prostaglandins on T colony formation. A single step culture process was used which involved direct seeding of freshly isolated peripheral blood mononuclear cells (MC) in semi-solid agar culture medium containing phytohaemagglutinin (PHA). Suppression of endogenous production of prostaglandins with 10(-6) M indomethacin increased T colony formation by up to 100%. Similarly, addition of synthetic prostaglandin E (PGE) to the culture system demonstrated a dose-dependent reduction of T colony formation by PHA-stimulated non-adherent cells. The 50% inhibitory dose (ID 50) was 10(-7) M for PGE2 and 1.3 x 10(-7) M for PGE1. Prostaglandin F had no effect on T colony formation. The synthesis of PGE by adherent cells can be increased two- to three-fold in the presence of T colony promoting activity released by PHA-stimulated lymphocytes. We conclude that monocyte produced PGE is responsible for the suppressor effect exerted by these cells on T colony formation. The PGE inhibitory role is interpreted as a feedback mechanism, modulated by lymphokines released by PHA-activated lymphocytes. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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