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Adenosine A1 receptor antagonists and the kidney
Paul S Modlinger1, William J Welch
1Division of Nephrology, The Cardiovascular-Kidney Institute, Georgetown University, Washington, Distritic of Columbia, USA.
Current Opinion in Nephrology and Hypertension
|August 16, 2003
Summary
Adenosine A(1)-receptors in the kidney influence kidney function and fluid balance. Antagonists show promise for heart failure treatment by enhancing diuresis and natriuresis, but their role in preventing kidney damage requires further study.
Area of Science:
- Nephrology
- Pharmacology
- Cardiovascular Medicine
Background:
- Adenosine A(1)-receptors in the kidney's afferent arteriole and proximal tubule play a role in regulating kidney function.
- These receptors can contribute to fluid-retaining disorders through mechanisms like tubuloglomerular feedback and direct sodium absorption.
Purpose of the Study:
- To review recent evidence on how kidney adenosine receptors affect renal function.
- To explore the potential therapeutic applications of adenosine receptor modulation in kidney disease and heart failure.
Main Methods:
- Review of recent animal and human studies on adenosine receptor function in the kidney.
- Analysis of the effects of adenosine A(1)-receptor antagonists on renal hemodynamics, fluid balance, and ischemic injury.
Main Results:
- Adenosine A(1)-receptor antagonists are effective adjuncts in treating congestive heart failure, improving diuresis, natriuresis, and glomerular filtration rate.
- Evidence suggests these antagonists inhibit tubular sodium absorption and tubuloglomerular feedback.
- Adenosine A(1)-receptors influence renin release and interact with angiotensin II, affecting renal blood flow.
Conclusions:
- Adenosine A(1)-receptor antagonists warrant larger clinical trials for congestive heart failure treatment.
- While these receptors mediate renal microcirculation vasoconstriction, their efficacy in preventing ischemic kidney damage is not well-established in animal models.