Further studies on renal nerve stimulation induced release of noradrenaline and dopamine from the canine kidney in situ

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Abstract
The renal venous outflow of dopamine and noradrenaline [norepinephrine] were studied in the canine kidney in situ in connection with renal nerve stimulation (RNS), RNS (0.5-4 Hz) caused frequency-dependent increases in the outflow of both catecholamines, which could be detected already at 0.5 Hz. The ratio dopamine/noradrenaline in renal venous plasma (approximately 0.15) was not influenced by varying the RNS parameters but was significantly enhanced (to about 0.25) by pretreatment with guanethidine according to a procedure previously used to demonstrate renal dopaminergic vasodilatation. The unstimulated kidney removed conjugated dopamine (which represents 98-99% of the total dopamine in plasma). During RNS the conjugated dopamine outflow to renal venous blood increased, but measurements of conjugated dopamine were less reliable than measurements of free dopamine to assess dopamine release from the kidney. When studying the renal nerve contributions to the renal venous outflow of dopamine and noradrenaline more accurate estimates may be obtained by correcting for the removal of catecholamines delivered to the kidney in arterial plasma. Such corrections were performed with endogenous adrenaline or radiolabelled noradrenaline. The 2 methods of correction yielded similar results and showed that RNS reduced catecholamine extraction in the kidney. The high ratio of dopamine/noradrenaline in kidney tissue (with a preferential distribution of dopamine to the cortex) and the dopamine outflow to renal venous plasma during RNS support the existence of specific dopaminergic nerves in the dog kidney.