Suppression of Noradrenaline Spillover by the Dopamine Prodrug γ-L-Glutamyl-L-Dopa: A Central Effect?
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The DA prodrug γ-L-glutamyl-L-dopa (gludopa) has a high degree of renal selectivity with 2-step conversion to DA in the kidney. The effects of gludopa, with and without DA-2 receptor blockade, on renal and total noradrenaline (NA) Spillover, were studied in two groups of rabbits. Eight rabbits received gludopa infusion (25 and 100μg/kg/min and 8) received an infusion of gludopa and DA-2 receptor antagonist, YM-09151 (50μg/kg i.v.). Renal and total NA spillover rates were measured by 3H-NA tracer method before and after gludopa infusion. Brain NA, DA, gludopa and L-dopa content were measured after gludopa infusion in 5 rabbits; control values for tissue catecholamine and drug levels were obtained in 5 untreated rabbits. Gludopa infusion markedly increased kidney DA content (300-fold) and DA excretion (6000-fold) but had little effect on plasma DA. It produced a dose-related fall in mean (±SEM) renal NA spillover (21.6±3.7 to 10.6±2.7, 7.2±2.7ng/min, p<0.01). Even greater falls were observed in total NA spillover after gludopa (43.1±10.2 to 19.7±3.4, 9.4±1.8ng/min, p< 0.01). DA-2 receptor antagonism had no influence on the effects of gludopa on either renal or total NA spillover. Significant amounts of gludopa were detected in the brain after drug infusion (0.28±13nmol/g brain tissue). Gludopa, a putative renal selective dopamine prodrug with effects mediated via DA-1 receptors also significantly inhibits both renal and extra-renal NA spillover. This effect is not a DA-2 effect but may be mediated centrally. (Hypertens Res 1995; 18 Suppl. I: S113-S118)
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