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RENAL HEMODYNAMICS AND CARDIORENAL INTEGRATION

Partial renal ischemia elicits heterogeneous control of renal sympathetic nerve activity to ischemic and nonischemic regions of the kidney

¹Department of Physiology, Graduate School of Health Sciences, Hiroshima University; and ²Department of Clinical Engineering, Faculty of Health Sciences, Hiroshima International University, Hiroshima, Japan

Submitted 7 July 2005 ; accepted in final form 13 September 2005

We tested the hypothesis that renal sympathetic nerve activity (RSNA) to the ischemic and nonischemic regions responded differently during partial ischemia of the kidney in pentobarbital-anesthetized cats. The renal artery divides into two branches at the front of the renal hilus: one branch perfuses predominantly the dorsal half of the kidney, and the other perfuses its ventral half. We identified the innervated area of a renal nerve bundle by supramaximal electrical stimulation and subsequently determined the changes in RSNA in response to occlusion of either renal arterial branch for 3 min. RSNA to the nonischemic region of the kidney gradually decreased by 23 ± 4% during partial renal ischemia, whereas RSNA to the ischemic region of the same kidney showed no significant change. Crushing either all renal nerve bundles or only the renal nerve bundles terminated to the ischemic region abolished the decrease in RSNA to the nonischemic region. Furthermore, intra-arterial administration of a prostaglandin synthesis inhibitor (meclofenamate, 4 mg/kg) abolished the decrease in RSNA to the nonischemic region of the kidney. Following spinal transection at the level of T₇, the inhibitory response in RSNA to the nonischemic region disappeared, whereas the RSNA to the ischemic region was markedly augmented by 47 ± 17%. Thus it is likely that renal chemoreceptors activated during renal partial ischemia elicit heterogeneous control of renal sympathetic outflows to the ischemic and nonischemic regions of the same kidney, which may be determined by a net output between the supraspinal inhibitory and spinal excitatory reflexes.

ipsilateral renorenal reflex; supraspinal inhibitory reflex; spinal excitatory reflex; complete renal ischemia; prostaglandins

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