ET excretion from UVECs was elevated while NO decreased in both Tibetan and Han groups after exposed to hypoxia. On time-points 12 h and 24 h, ET was significantly lower in TH than in HH, while concentration of NO showed no difference in TH and HH.

• 体外低氧 (0 .；5%25O2 )条件培养 12h和 2 4h时；TH组ET浓度显著低于HH组；而HH组与TH组和HC组与TC组相应时间点之间的NO浓度差异无显著性意义。