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- W2409804948 abstract "Oxygenated derivatives of cholesterol are potent immunosuppressors. It has been reported previously that 7,25-dihydroxycholesterol (7,25-OHC), synthesized in the URA31, strongly inhibits the early steps of T-cell activation. So far, the mechanisms underlying this type of effect have been mainly investigated in vitro, and the activity of these substances on the immune system has been poorly studied. This study describes that a single i.p. injection of 7,25-OHC induces a strong inflammatory response, consisting of a massive influx of macrophages and neutrophils into the abdominal cavity. Macrophages harvested from 7,25-OHC-treated mice express class II antigen to a lesser extent. Moreover, the 7,25-OHC treatment abolishes the class II induction by bacillus Calmette-Guérin (BCG) or interferon-gamma (IFN-gamma). The inflammatory process triggered by the oxysterol is not the consequence of a non-specific effect due, for instance, to the presence of crystals in the abdominal cavity. Moreover, treatments by inhibitors of the acid arachidonic cascade do not affect the peritoneal exudate cell (PEC) influx induced by these substances. This study could be an important contribution to the mechanism determining the oxysterol-induced immunosuppression." @default.
- W2409804948 created "2016-06-24" @default.
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- W2409804948 date "1990-07-01" @default.
- W2409804948 modified "2023-09-25" @default.
- W2409804948 title "Studies on the immunological properties of oxysterols: in vivo actions of 7,25-dihydroxycholesterol upon murine peritoneal cells." @default.
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