Role of nitric oxide in the development of glomerular ischemia reperfusion injury in rats / 中国病理生理杂志

ABSTRACT

AIM: To investigate the effects of nitric oxide on ultrastructure and anionic sites of glomerular in renal ischemia reperfusion injured(I-RI) rats.METHODS: Animals were divided randomly into five groups(1) sham group(n=6);(2) I-RI group(n=6),0.3 mL normal saline was injected via venae lingualis 20 min before ischemia;(3) SNP+I-RI group(n=6),2.5 ?g/kg sodium nitroprusside(SNP) was injected via venae lingualis 20 min before ischemia;(4) AG+I-RI group(n=6),10 mg/kg aminoguanidine(AG) was injected via venae lingualis 20 min before ischemia;(5) L-NNA+I-RI group(n=6),10 mg/kg N~?-nitro-L-arginine(L-NNA) was injected via venae lingualis 20 min before ischemia.Anionic sites of glomerular were studied with a cationic probe-polyethyleneimine(PEI) and ultrastructure was observed under electron microscope in renal I-RI rats.RESULTS:(1) Ultrastructure of glomerular was normal and anionic sites(AS) was located clearly in lamina rare externa of GBM in sham rats.The PEI particles arranged regularly in line(19.3?1.7/(1 000 nm)) under electronic microscope.Obvious foot processes derangement and effacement were observed and the AS number in GBM of I-RI group was fewer(16.6?1.0/(1 000 nm),P0.05).CONCLUSION: Foot process effacement and reduction of anionic sites were present in glomerular filtration membrane in renal I-RI rats.NO aggravated those injuries,indicating that NO plays a role in the ultrastructure damages of glomerular filtration membrane in I-RI rats.