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- W1514200939 abstract "OBJECTIVE To investigate the effects of chronic ethanol consumption and diabetes on nitric oxide (NO)‐mediated relaxation of cavernosal smooth muscle (CSM). MATERIAL AND METHODS Male Wistar rats were divided into four groups: control, isocaloric, diabetic and ethanol‐diabetic. The CSMs were mounted in organ chambers for measurement of isometric tension. Contraction of the strips was induced by electrical field stimulation (EFS, 1–32 Hz) and phenylephrine. We also evaluated the effect of ethanol consumption on the relaxation induced by acetylcholine (ACh; 0.01–1000 µmol/L), sodium nitroprusside (SNP, 0.01–1000 µmol/L) or EFS (1–32 Hz) in strips pre‐contracted with phenylephrine (10 µmol/L). Immunoexpression of endothelial NO synthase (eNOS) and inducible NOS (iNOS) was also accessed. RESULTS The endothelium‐dependent relaxation induced by ACh was decreased in CSM from ethanol‐diabetic rats when compared with the controls, with a mean ( sem ) of 21 (4) vs 37 (2)%. Similarly, the potency and maximal responses induced by SNP were reduced in the ethanol‐diabetic [3.97 (0.38) and 85 (1)%, respectively] and diabetic groups [3.78 (0.56) and 81 (2)%, respectively] when compared with the controls [5.3 (0.22) and 90 (3)%, respectively] and isocaloric [5.3 (0.19) and 92 (1)%, respectively] groups. Noradrenergic nerve‐mediated contractions of CSM in response to EFS were increased in rats from ethanol‐diabetic and diabetic groups when compared with the control and isocaloric groups. Conversely, there were no differences in EFS‐induced relaxation among the groups. The immunostaining assays showed overexpression of eNOS and iNOS in the CSM from diabetic and ethanol‐diabetic rats when compared with the control and isocaloric rats. CONCLUSION There was an impairment of relaxation of CSM from ethanol‐diabetic and diabetic rats that involved a decrease in the NO‐cyclic guanosine monophosphate signalling pathway by endothelium‐dependent mechanisms accompanied by a change in the CSM contractile sensitivity." @default.
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- W1514200939 date "2010-05-10" @default.
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- W1514200939 title "Chronic alcoholism associated with diabetes impairs erectile function in rats" @default.
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- W1514200939 doi "https://doi.org/10.1111/j.1464-410x.2009.09084.x" @default.
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