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[DIFFERENCES OF EXENATIDE EFFECTS ON GLYCEMIA AND RENAL WATER AND ION EXCRETION IN FROGS AND RATS].

A V Kutina, A S Marina, Yu V Natochin

Zhurnal Evoliutsionnoi Biokhimii I Fiziologii

|January 30, 2019

Summary

This summary is machine-generated.

Exenatide, a GLP-1 mimetic, aids glucose control in rats but not frogs. It also impacts water-salt balance in rats, suggesting evolutionary adaptations in mammals for GLP-1 effects.

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Area of Science:

Comparative physiology
Endocrinology
Renal physiology

Background:

Glucagon-like peptide-1 (GLP-1) plays a role in glucose homeostasis.
The evolutionary basis of GLP-1's effects on water-salt balance is not fully understood.
Renal tubular reabsorption differs significantly between mammals and amphibians.

Purpose of the Study:

To compare the effects of the GLP-1 mimetic exenatide on glucose and water-salt homeostasis.
To investigate these effects in species with differing renal tubular proximal reabsorption: rats (mammals) and frogs (amphibians).

Main Methods:

Glucose tolerance tests were performed on rats and frogs.
Water loading and furosemide treatment were used to assess water-salt homeostasis.
Urinary parameters including flow rate, sodium excretion, and solute-free water clearance were measured.

Main Results:

Exenatide accelerated glucose recovery in rats but delayed it in frogs.
In rats, exenatide augmented solute-free water clearance and natriuresis.
Exenatide did not significantly alter water or salt excretion in frogs under diuresis.

Conclusions:

GLP-1's role in regulating water-salt homeostasis in mammals may be linked to evolutionary increases in glomerular filtration rate and proximal tubular reabsorption.
Species-specific differences in renal physiology influence the metabolic and homeostatic effects of GLP-1 mimetics.
Exenatide demonstrates differential impacts on glucose and renal function across vertebrate classes.