The inhibitory effects of Radix Astragali on hypoxic pulmonary hypertension of rats.

OBJECTIVE: To observe the inhibitory effects of Radix Astragali (RA) on hypoxic structural remodeling of intraacinar pulmonary arteries (IAPA) and pulmonary hypertension (PHT). METHODS: Sixty rats were divided into three groups: hypoxia group, hypoxia + RA group and normal control group. The rats of hypoxia group and hypoxia + RA group were fed in hypoxic environment under normal atmospheric pressure (10% O2, 10 h/day). On the 15th and 30th day of hypoxia, right ventricular systolic pressure (RVSP) and right ventricle hypertrophy index (RVHI) were measured and pulmonary vessel changes were studied under light and electron microscope and with morphometric analysis. RESULTS: Compared with the result of hypoxia + RA group, RA could relieve IAPA wall cell injuries and dilate the constricted IAPA induced by hypoxia. RA could also inhibit hypertrophic changes in the tunica media and proliferation of adventitial cells of the IAPA and muscularization of nonmuscular arteries. CONCLUSION: By preserving the IAPA wall cells and dilating IAPA, RA may play an important role in inhibiting the remodeling of IAPA and preventing PHT.

[Therapeutic effect of radix Astragali on hypoxia pulmonary hypertension in rats].

Radix Astragali could inhibit the type III collagen deposition, smooth muscle cell proliferation in IAPA, and increase the tolerance of myocardium to hypoxia in rats.