Role of vasoactive intestinal peptide in hyperoxia-induced injury of primary type II alveolar epithelial cells.

摘要

OBJECTIVE: We investigated the effect of VIP on primary type II alveolar epithelial cells (AECIIs) upon the exposure of hyperoxia. METHODS: AECIIs were isolated and purified from premature rats and exposed to air (21% oxygen), hyperoxia(95% oxygen), VIP+air and VIP+hyperoxia, respectively. The proliferation and apoptosis of AECIIs were detected by MTT cell proliferation assay, flow cytometry and western blot. The production of intracellular reactive oxygen species (ROS) was determined by 2 ', 7'-dichloro-dihydrotestosterone fluorescein diacetate (DCFH-DA) molecular probe and the total antioxidant capacity (TAOC) by ultraviolate spectro-photometer. RESULTS: Cell proliferation significantly increased and apoptosis decreased upon the treatment with VIP. In addition, the level of ROS in the hyperoxia+VIP group was significantly lower than in the hyperoxia group, in contrast, TAOC was higher in the hyperoxia+VIP group than that in the hyperoxia group. CONCLUSIONS: VIP exerts a protective role in the hyperoxia-induced oxidative stress damage in AECIIs, which probably attributed to its anti-oxidant and anti-apoptosis property.