Summary
Rates of noradrenaline reuptake and spillover into plasma were examined in conscious rabbits before and during activation of the sympathetic nervous system to determine whether neuronal reuptake varies disproportionately or in parallel with increases in noradrenaline release. The sympathetic nervous system was stimulated by nitroprusside-induced hypotension, 2-deoxyglucoseinduced glucopenia or intravenous infusion of isoprenaline before and after administration of desipramine to block neuronal uptake. Spillover of noradrenaline into plasma was estimated from the dilution of intravenously infused 3H-noradrenaline with endogenous plasma noradrenaline. The amount of dihydroxyphenylglycol (DHPG) in plasma that was derived from metabolism of recaptured noradrenaline, together with the desipramine-induced decreases in clearance from plasma of 3H-noradrenaline and appearance in plasma of 3H-DHPG, were used to estimate the rate of neuronal reuptake of noradrenaline.
The mean (± SEM) resting noradrenaline reuptake rate (n = 28) was 0.62 ± 0.04 nmol kg−1 min−1, 5-fold greater than the rate of its spillover into plasma (0.12 ± 0.02 nmol kg−1 min−1). Intravenous infusion of nitroprusside at 3 rates titrated to cause graded increases in heart rate caused 74%, 129% and 240% increases in noradrenaline spillover into plasma and 66%, 104% and 198% increases in noradrenaline reuptake. At 15–30 min after intravenous injection of 2-deoxyglucose (500 mg/kg) there was a 106% increase in noradrenaline spillover and a 93% increase in noradrenaline reuptake. Infusion of isoprenaline (0.25 μg kg−1 min−) caused a 102% increase in noradrenaline spillover and a 130% increase in noradrenaline reuptake. The proportionally similar increases in noradrenaline reuptake and spillover into plasma during activation of noradrenaline release from sympathetic nerves indicated that the efficacy of neuronal reuptake — the percentage of released noradrenaline that is recaptured — is unaltered by short-term increases in the amount of neurotransmitter liberated into the synaptic cleft.
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Eisenhofer, G., Cox, H.S. & Esler, M.D. Parallel increases in noradrenaline reuptake and release into plasma during activation of the sympathetic nervous system in rabbits. Naunyn-Schmiedeberg's Arch Pharmacol 342, 328–335 (1990). https://doi.org/10.1007/BF00169445
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DOI: https://doi.org/10.1007/BF00169445