Effects of nNOS and iNOS on the nerve cell apoptosis of rats' HIP after traumatic brain injuries
- VernacularTitle:脑创伤后nNOS和iNOS对大鼠海马神经细胞凋亡的影响
- Author:
Chaoyan SONG
;
Jianzhong CUI
;
Chunsheng WANG
;
Jun HONG
- Publication Type:Journal Article
- Keywords:
craniocerebral trauma;
nitric oxide synthase;
apoptosis
- From:
Medical Journal of Chinese People's Liberation Army
2001;0(08):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the mechanism of neurotoxic effects of neuron nitric oxide synthase(nNOS)and inducible nitric oxide synthase(iNOS),and the therapeutic effects of 7-nitroindazole(7-NI)and aminoguanidine(AG),in traumatic brain injury(TBI)rats.Methods Two hundred and fifty adult male Wistar rats were randomly divided into 5 groups:sham operation group,traumatic group,AG group,7-NI group and AG+7-NI group.Animals in each group were divided into 8 subgroups according to the time after trauma(1,3,6,12 hours and 1,3,7,14 days).Severe diffused brain injury model was made with Marmarou method.Expressions of nNOS and iNOS in hippocampus CA1 region were determined by immunohistochemistry,nerve cells apoptosis in hippocampus CA1 region was observed by TUNEL methods,and the relationship between apoptosis and NOS was observed by double staining.Results In trauma group,the expression of nNOS in hippocampus CA1 region peaked at 6h post-trauma,the expression of iNOS and apoptosis of nerve cells in hippocampus CA1 region both peaked at 3d post-trauma,while the apoptosis was alleviated in AG group,7-NI group and AG+7-NI group.The number of both TUNEL staining and nNOS immunostaining positive cells increased at 6h post-trauma in trauma group,significantly higher than that in 7-NI group.The number of both TUNEL staining and iNOS immunostaining positive cells increased at 3d post-trauma in trauma group,significantly higher than that in AG group.Conclusions The over-expression of nNOS and iNOS has toxic effects to neural tissues of brain,serves as one of the factors inducing nerve cell apoptosis in hippocampus CA1 region.7-NI and AG can inhibit the expression of nNOS and iNOS,reduce the nerve cell apoptosis,and play an important role in neuroprotective effect.
