RESUMO
Objective To explore the effects of diethylenetriamine/nitric oxide (DETA/NO)on capillary spasm and early brain injury (EBI)after subarachnoid hemorrhage (SAH)in rats.Methods Sixty-nine male Sprague-dawley rats were randomized into three groups:sham group,SAH group and DETA/NO group.SAH model was established by wearing out the willis ring with thread and then Garcia neurological score was observed in the general animals.The expressions of alpha smooth muscle actin (αSMA)and PDGFRβwere detected by dual immunofluorescence staining;nitric oxide kit was used for detecting brain tissue NO concentration.Changes in the hemoglobin-stimulated capillaries were observed in rat slices.Results Three days after surgery,neurological deficit score was remarkably improved in DETA/NO group compared with that in SAH group (P<0 .0 5 ). Immunofluorescence results showed that the expressions of peri-capillaryαSMA and PDGFRβwere significantly increased after SAH (P<0.05 ),and that DETA/NO could down-regulate the expressions (P<0.05 ).NO concentration was greatly reduced about 3 hours after SAH and then gradually increased;DETA/NO could maintain the concentration of NO at an early stage (P<0 .0 5 ).The capillary contraction was observed in slices perfused with hemoglobin;DETA/NO could alleviate capillary spasm.Conclusion DETA/NO can alleviate the severity of capillary spasm and EBI after SAH in rats.