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Adenosine effects on renal function in the rat: role of sodium intake and cytochrome P450
Marta Kuczeriszka1, Leszek Dobrowolski, Agnieszka Walkowska
1Department of Renal and Body Fluid Physiology, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland.
Background/Aims:
Adenosine (ADO) causes vasodilation in most tissues. In the kidney it can induce vasoconstriction or vasodilation, depending on the prevailing stimulation of A1 or A2 receptors (A1R, A2R). ADO-induced alterations of renal excretion may be secondary to haemodynamic changes, or reflect a direct influence on tubular transport. This whole-kidney study explored renal excretory responses to ADO receptor stimulation as related to renal haemodynamics sodium intake and cytochrome P450 (CYP-450) activity.
Methods:
The effects of ADO or an A2aR agonist (DPMA) on urine flow (V), sodium excretion (UNaV) and total solute excretion were examined in anaesthetized Wistar rats on a low-sodium or high-sodium (HS) diet. Total renal blood flow (RBF; renal artery probe), and outer- and inner-medullary blood flows (OM-BF, IM-BF; laser-Doppler fluxes) were also determined.
Results:
Consistent opposed effects of ADO and DPMA were only observed with the HS diet. ADO increased V (150%) and UNaV (100%); there were also significant increases in RBF, OM-BF and IM-BF. These changes were prevented by 1-aminobenzotriazol, a CYP-450 inhibitor. In HS rats, DPMA significantly decreased arterial blood pressure and renal excretion.
Conclusions:
Post-ADO diuresis/natriuresis was in part secondary to renal hyperperfusion; the response was probably mediated by CYP-450-dependent active agents. Selective A2aR stimulation induced systemic vasodilation, major hypotension, and a secondary decrease in renal excretion.
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