Differential Changes of ATP-sensitive Potassium Channel Current after Hypoxia-reperfusion Treatment in Mouse Neuroblastoma 2a (N2a) Cell.
- Author:
Ji Ho PARK
1
Author Information
1. Department of Neuroscience, Graduate School of East-West Medical Science, Kyung Hee University, Yongin, Korea. jihopark@khu.ac.kr
- Publication Type:Original Article
- Keywords:
KATP channel;
Hypoxia;
Diazoxide;
Glibenclamide
- MeSH:
Animals;
Anoxia;
Diazoxide;
Glyburide;
KATP Channels;
Mice*;
Neuroblastoma*;
Potassium Channels*;
Potassium*;
Reperfusion
- From:The Korean Journal of Physiology and Pharmacology
2002;6(4):183-186
- CountryRepublic of Korea
- Language:English
-
Abstract:
Ischemic damage is one of the most serious problems. The openers of KATP channel have been suggested to have an effect to limit the ischemic damage. However, it is not yet clear how KATP channels of a cell correspond to hypoxic damage. To address the question, N2a cells were exposed to two different hypoxic conditions as follows: 6 hours hypoxia followed by 3 hours reperfusion and 12 hours hypoxia followed by 3 hours reperfusion. As the results, 6 hours hypoxic treatment increased glibenclamide-sensitive basal KATP current activity (approximately 6.5-fold at 0 mV test potential) when compared with nomoxic condition. In contrast, 12 hours hypoxic treatment induced a relatively smaller change in the KATP current density (2.5-fold at 0 mV test potential). Additionally, in experiments where KATP channels were opened using diazoxide, the hypoxia for 6 hours significantly increased the current density in comparison to control condition (p < 0.001). Interestingly, the augmentation in the KATP current density reduced after exposure to the 12 hours hypoxic condition (p < 0.001). Taken together, these results suggest that KATP channels appear to be recruited more in cells exposed to the 6 hours hypoxic condition and they may play a protective role against hypoxia-reperfusion damage within the time range.
