text: Comparison of captopril and enalapril to study the role of the sulfhydryl-group in improvement of endothelial dysfunction with ACE inhibitors in high dieted methionine mice.
  To examine the role of sulfhydryl (-SH) group in improvement of endothelial dysfunction with angiotensin-converting enzyme (ACE) inhibitors in experimental high dose of methionine dieted rats. We compared the effects of Captopril (an ACE inhibitor with -SH group), enalapril (an ACE-inhibitor without -SH group), N-acetylcysteine (only -SH group not ACE inhibitor) on endothelial dysfunction injured by methionine-induced hyperhomocysteinemia (HHcy) in rats. Male Sprague-Dawley rats were divided randomly into seven groups: control group, L-methionine group, low dose Captopril (15 mg/kg), middle dose Captopril (30 mg/kg), high dose Captopril (45 mg/kg), enalapril (20 mg/kg), N-acetylcysteine (200 mg/kg); control group were intragastric gavaged by water and others groups were intragastric gavaged by L-methionine and drugs in water one time every day. Acetylcholine (ACh)-induced endothelium-dependent relaxation (EDR), sodium nitroprusside (SNP)-induced endothelium-independent relaxation of aortic rings were examined. Paraoxonase1 (PON1) and ACE activity, malondialdehyde (MDA), nitric oxide (NO), superoxide dismutase (SOD) in serum were analyzed. It was found that a single intragastric gavage by L-methionine resulted in inhibition of endothelium-dependent relaxation, markedly increased the serum level of malondialdehyde and decreased the activity of PON1 and SOD, similarly decreased the level of NO in the serum; but had no effects on endothelium-independent relaxation and angiotensin-converting enzyme activity compared with the control group. Given the treatment with three doses of Captopril (15 approximately 45 mg/kg) markedly attenuated inhibition of vasodilator responses to ACh, and eliminated the increased level of malondialdehyde, the decreased level of NO, activity of PON1 and SOD in serum by single intragastric gavaged L-methionine. However, there were some significant differences among Captopril (30 mg/kg or 45 mg/kg), enalapril (20 mg/kg), and N-acetylcysteine particular in the activity of PON1 and ACE. These results suggested that Captopril can protect the vascular endothelium against the damages induced by L-methionine in rats, and the beneficial effects of Captopril may be related to attenuating the decrease in PON1 activity and NO levels. Furthermore, this protective effect may be concerned with the sulfhydryl group.
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entities.type: CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL GENE-Y CHEMICAL GENE-Y GENE-Y GENE-N GENE-N GENE-Y GENE-Y GENE-N GENE-Y GENE-Y GENE-N CHEMICAL GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y CHEMICAL CHEMICAL CHEMICAL CHEMICAL
entities.text: Captopril methionine ACh malondialdehyde NO L-methionine Captopril enalapril N-acetylcysteine Captopril malondialdehyde L-methionine Captopril Captopril NO sulfhydryl sulfhydryl SH enalapril SH N-acetylcysteine MDA SH SH methionine L-methionine Captopril Captopril Captopril enalapril N-acetylcysteine L-methionine nitric oxide Acetylcholine ACh sodium nitroprusside angiotensin SNP captopril methionine enalapril sulfhydryl Paraoxonase1 NO PON1 ACE superoxide dismutase SOD ACE PON1 SOD angiotensin-converting enzyme PON1 SOD superoxide PON1 ACE PON1 ACE ACE ACE angiotensin-converting enzyme ACE L-methionine malondialdehyde NO angiotensin