Effect of adenosine and inosine on ureagenesis in hepatocytes
- Resource Type
- Authors
- I Laguna; A Zentella; Enrique Piña; Raquel Guinzberg; R Guzman
- Source
- Scopus-Elsevier
- Subject
- Male
medicine.medical_specialty
Adenosine
Epinephrine
Stimulation
In Vitro Techniques
Biochemistry
Glucagon
chemistry.chemical_compound
Ammonia
Internal medicine
medicine
Animals
Urea
Inosine
Molecular Biology
Hypoxanthine
Dose-Response Relationship, Drug
Rats, Inbred Strains
Cell Biology
Xanthine
Stimulation, Chemical
Rats
Glutamine
Endocrinology
Liver
chemistry
Uric acid
Research Article
medicine.drug
- Language
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.