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The uridine nucleotides constitute a natriuretic pressor system.
G Macdonald1, R Assef, S Watkins
1University of New South Wales, School of Medicine, Little Bay, Australia.
Clinical and Experimental Pharmacology & Physiology
|March 1, 1987
Summary
Uridine monophosphate administration in rats induced significant natriuresis, indicating a role in kidney function. Uridine compounds are concentrated in distal tubules, suggesting a specific role in sodium transport.
Area of Science:
- Nephrology
- Renal Physiology
- Molecular Biology
Background:
- Uridine monophosphate (UMP) is a nucleotide with potential physiological roles.
- The kidney's intricate structure suggests localized functions for various compounds.
Purpose of the Study:
- To investigate the natriuretic properties of Uridine monophosphate in conscious rats.
- To localize uridine-containing compounds within the rat kidney using immunoperoxidase techniques.
Main Methods:
- Conscious rats were infused with Uridine monophosphate at a moderate pressor dose.
- Control infusions of solvent vehicle were administered for comparison.
- Immunoperoxidase staining was employed to visualize uridine distribution in kidney tissue.
Main Results:
- Uridine monophosphate infusion resulted in a statistically significant increase in sodium excretion (natriuresis).
- Uridine-containing compounds were detected throughout renal tubular elements.
- Dense staining for uridine was particularly prominent in the distal tubules and collecting ducts.
Conclusions:
- The observed natriuresis suggests Uridine monophosphate influences renal sodium handling.
- High concentrations of uridine in distal nephrons point towards a specific role in sodium transport, beyond potential effects of increased renal perfusion pressure.