ABSTRACT
Objective To investigate the protective effect of hepatocyte growth factor (HGF) on cultured Sprague-Dawley rat cortical neurons injured through hypoxia/reoxygenation.Methods Primary cultured cerebral cortical neurons were isolated from newborn rots.Neurons were pre-incubated with different concentrations (15,30 and 60 μg/L) of HGF.The cell viability was detected by MTT.Apoptosis was measured by Hoechst 33258 staining and flow cytometer.Lactate dehydrogenase (LDH) and caspase-3 activity were determined by colorimetry.Results Compared with normal group,hypoxia/reoxygenation treatment significantly decreased cell viability,increased LDH activity and the percentage of apoptotic cells.Pretreatment of HGF for 12 h could remarkably reverse the decrease of cell viability and the increase of apoptosis rate in neurons induced by hypoxia/reoxygenation treatment.HGF pre-treatment also attenuated the activity of LDH and caspase-3 in a dose-dependent manner.The effects of HGF could be inhibited by a special PI3K/Akt pathway inhibitor,LY294002.Condusion HGF could attenuate rat cortical neuron injury induced by hypoxia/reoxygenation.The neuroprotective effect of HGF may be related to activating PI3K/Akt pathway,and further suppressing the expression of caspase-3.
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Objective To find the effect and potential mechanism of ischemic postconditioning relief rCBF and VEGF expression during focal cerebral thrombosis.Methods The thrombotic focal cerebral ischemia was induced by photochemical reaction in tree shrews.The rCBF and VEGF expression in hippocampus CA1 area were detected,by laser-Doppler(LD) fowmeter and immunohistochemistry.Results rCBF reduces along with temporal lasting in cerebral thrombus,especially in 24 h;VEGF expression enhanced after cerebral ischemic,express of VEGF in 12 h is the most intensification(P0.05),mostly in 12 h(P
ABSTRACT
AIM:To study the effects of ischemic postconditioning(PC) on regional cerebral blood flow(rCBF) and astrocyte(AS) activation in hippocampus CA1 area and to explore the possible mechanism of ischemic PC affecting glial fibrillary acidic protein(GFAP) expression during focal cerebral thrombosis.METHODS:The thrombotic focal cerebral ischemia was induced by photochemical reaction in tree shrews,and ischemic postconditioning was established by cliped ipsilateral carotid of the animal at 4 h after cerebral ischemia.The rCBF and GFAP expressions in hippocampus CA1 area were detected,respectively,by laser-Doppler(LD) fowmeter and immunohistochemistry.RESULTS:The numbers of GFAP positive cells were increased markedly and GFAP expression enhanced(P