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. 1987 Jul 15;245(2):371-4.
doi: 10.1042/bj2450371.

Effect of adenosine and inosine on ureagenesis in hepatocytes

R Guinzberg  1 , I Laguna, A Zentella, R Guzman, E Piña
Affiliations

Effect of adenosine and inosine on ureagenesis in hepatocytes

R Guinzberg et al. Biochem J. .

Abstract

Adenosine and inosine produced a dose-dependent stimulation of ureagenesis in isolated rat hepatocytes. Hypoxanthine, xanthine and uric acid were without effect. Half-maximally effective concentrations were 0.08 microM for adenosine and 5 microM for inosine. Activation of ureagenesis by both nucleosides had the following characteristics: (a) it was observed with either glutamine or (NH4)2CO3, provided that glucose was present; (b) it was not detected when glucose was replaced by lactate plus oleate; (c) it was mutually antagonized by glucagon, but not by adrenaline; and (d) it was dependent on Ca2+. We suggest that the action of adenosine and inosine on ureagenesis might be of physiological significance.

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