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Inhibition of immediate allergic reactions by ethanol extract from Plumbago zeylanica stems

作者 Dai, Y; Hou, LF; Chan, YP; Cheng, L; But, PPH

期刊 BIOLOGICAL & PHARMACEUTICAL BULLETIN , MAR 2004,3:27

DOI 10.1248/bpb.27.429 PubMed 14993817

摘要 The antiallergic properties of the 70% ethanol extract from Plumbago zeylanica stems (EPZ) were investigated in the present study. The extract (500, 1000 mg/kg, p.o.) dose-dependently inhibited systemic anaphylactic shock induced by compound 48/80 in mice, reduced homologous passive cutaneous anaphylaxis and skin reactions induced by histamine or serotonin in rats, significant differences were observed at the dose of 1000 mg/kg. In vitro, EPZ (5, 20, 50 mug/ml) concentration-dependently reduced histamine release from rat peritoneal mast cells caused by compound 48/80 and antigen. EPZ (50 mug/ml) markedly increased intracellular cAMP content of rat mast cells. These findings demonstrate that EPZ inhibits mast cell-dependent immediate allergic reactions, which is probably mediated by reducing the release of mediators such as histamine from mast cells via elevating intracellular cAMP level and weakening the inflammatory action of mediators.

涉及物种 白花丹 Plumbago zeylanica