RESUMO
Aim To observe the damages induced by hydrogen peroxide in cultured bovine cerebral microvascular endothelial cells (BCMEC) and evaluate the protective effects of hydroxyethylpuerarin on hydrogen peroxide-injured BCMEC. Methods BCMEC were cultured and transferred into modified Eagle medium (MEM). The viability of cells was detected by MTT assay. Cell injury was determined by lactate dehydrogenase (LDH) activity in the extracellular medium. Flow cytometry was employed to observe the occurrence of apoptosis. Morphologic changes of cells were visualized under phase contrast and electron occurrence of apoptosis. Hydroxyethylpuerarin was shown to increase the survival rate and decrease the activity of LDH of BCMEC damaged by hydrogen peroxide. Hydroxyethylpuerarin was also found to protect BCMEC against apoptosis induced by hydrogen peroxide. Conclusion Hydrogen peroxide induces BCMEC injury either by apoptosis or through necrosis. Hydroxyethylpuerarin protects BCMEC against hydrogen peroxide-induced injury in a concentration-dependent manner. Its antioxidant effects might be involved as the mechanism protection.
RESUMO
cAMP response element binding protein(CREB) is a genetranscription regulator locating in the nucleus.The activated CREB by phosphoration plays an important role by binding to the cAMP response elements and modulate the transcription of various target genes.In addition,the activity of CREB is also regulated by lots of transcriptional regulators in signal transduction mechanism.In central nerve system,CREB participates in promoting neuron growth,the processes of plasticity and long term memory.More importantly,researches of CREB in the pathological processes of Alzheimers disease,Hungtingtons disease and HIV-related dementia have made a progress recently,providing a basis for some therapy strategies to the related neurodegenerative disorders.