Abstract
Corticostatin I (CSI) is one of the corticostatic peptides which inhibit ACTH-stimulated steroidogenesis. To clarify the function of CSI on the immune system, the effect of CSI on phagocytosis by peritoneal macrophages was examined by means of flow cytofluorometry. In the presence of Ca2+ and Mg 2+, CSI enhanced phagocytosis of latex beads in a dose-dependent manner. Unstimulated phagocytosis in physiological solution consisted of Ca2+ and Mg2+-dependent and -independent phagocytosis. Divalent cations-independent phagocytosis was sensitive to CSI. Present results suggest that the enhancement of phagocytosis by CSI may be one of the mechanisms modulating the immune response regarding infection and inflammation. Present study also showed that one of defensin HNP-1 enhanced phagocytosis.
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