Reactive oxygen species mediate neuroprotection induced by mitochondrial ATP-sensitive potassium channel opener in rat hippocampal slices during hypoxia
- VernacularTitle:ROS介导线粒体ATP敏感性钾通道开放剂对缺氧脑的保护作用
- Author:
Huawei LIANG
;
Qiang XIA
- Publication Type:Journal Article
- Keywords:
Mitochondria;
Potassium channels;
Hypoxia, brain;
Reactive oxygen species
- From:Chinese Journal of Pathophysiology
2000;0(10):-
- CountryChina
- Language:Chinese
-
Abstract:
AIM: To examine whether reactive oxygen species (ROS) is involved in the neuroprotection by mitochondrial ATP- sensitive potassium channel (mitoKATp) in rat hippocampal slices during hypoxia. METHODS: The technique of elec-trophysiology was used, and the latency to hypoxic depolarization (HD) and the amplitude of population spike (PS) in the stratum pyramidale of the CA1 region were measured. RESULTS: Pretreatment of the slices with diazoxide (DIA, a mitoKATP opener, at concentration of 300 ?mol/L) , prolonged the latency to HD, delayed the onset of PS disappearance and improved the recovery of PS after reoxygenation. The effects induced by DIA were attenuated by 5 - hydroxydecanoic acid (a mitoKATP blocker, at concentration of 200 ?mol/L). Pretreatment with N - 2 - mercaptopropionyl glycine (MPG, a ROS scavenger, at concentration of 500 ?mol/L), also abrogated the effects induced by DIA, while treatment of MPG alone had no effect on PS and HD. CONCLUSION: ROS participates in neuroprotection offered by mitoKATp opener during hypoxia.
