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Interaction between adenosine and angiotensin II in renal microcirculation
M S Dietrich1, K Endlich, N Parekh
1First Institute of Physiology, University of Heidelberg, Federal Republic of Germany.
Microvascular Research
|May 1, 1991
Summary
Adenosine requires functional angiotensin II (A II) receptors for vasoconstriction in the renal microcirculation. However, A II can constrict vessels independently of adenosine signaling.
Area of Science:
- Nephrology
- Cardiovascular Physiology
- Pharmacology
Background:
- The interplay between adenosine and angiotensin II (A II) in regulating renal microcirculation is not fully understood.
- Adenosine and A II are key vasoactive substances affecting kidney function.
Purpose of the Study:
- To investigate the potential interaction between adenosine and A II in controlling renal microcirculation.
- To elucidate the roles of adenosine and A II signaling pathways in renal vasoconstriction.
Main Methods:
- In vivo microscopy was employed in a split hydronephrotic rat kidney model.
- The effects of adenosine and A II agonists and antagonists (saralasin, N6-cyclohexyladenosine, 1,3-dipropyl-8-cyclopentylxanthine) were assessed.
Main Results:
- The A II receptor antagonist saralasin blocked adenosine-induced vasoconstriction and reduced glomerular blood flow.
- Adenosine reduced glomerular blood flow and vessel diameters.
- A II induced vasoconstriction and reduced glomerular blood flow, independent of A1-adenosine receptor blockade.
Conclusions:
- Adenosine-mediated vasoconstriction in the renal microcirculation appears to depend on functional angiotensin II receptor signaling.
- Angiotensin II can induce renal vasoconstriction through a mechanism independent of adenosine.