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Protective effect of agmatine on ischemia/reperfusion-induced renal injury in rats. | LitMetric
Enhanced renal sympathetic nerve activity (RSNA) during ischemic period and the renal venous norepinephrine (NE) overflow after reperfusion play important roles in the development of ischemic/reperfusion (I/R)-induced acute renal failure (ARF) in rats. This study evaluated whether agmatine, which is known to reduce sympathetic nerve activity and NE overflow by electrical stimulation, would prevent the I/R-induced renal dysfunction. Ischemic ARF was induced by clamping the left renal artery and vein for 45 minutes followed by reperfusion 2 weeks after the contralateral nephrectomy. Intravenous (IV) injection of agmatine (100 and 300 micromol/kg) to ischemic ARF rats dose-dependently suppressed the enhanced RSNA and attenuated the I/R-induced renal dysfunction and histological damage. Intracerebroventricular (ICV) injection of agmatine (600 nmol/kg) to ischemic ARF rats suppressed the enhanced RSNA during the ischemic period and attenuated the I/R-induced renal injury. Furthermore, both IV and ICV injection of agmatine significantly suppressed the renal venous NE overflow after the reperfusion. These results indicate that agmatine prevents the development of I/R-induced renal injury, and the effect is accompanied by suppression of the enhanced RSNA during ischemic period and NE overflow from renal sympathetic nerve endings.
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