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Journal of Renin-Angiotensin-Aldosterone System
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Aldosterone-induced endothelial dysfunction of rat aorta: role of poly(ADP-ribose) activation

Arda Tasatargil

Department of Pharmacology, Medical Faculty, Akdeniz University, 07070, Antalya, Turkey, ardatas{at}akdeniz.edu.tr

Merih Tekcan

Department of Histology and Embryology, Medical Faculty, Akdeniz University, 07070, Antalya, Turkey

Ciler Celik-Ozenci

Department of Histology and Embryology, Medical Faculty, Akdeniz University, 07070, Antalya, Turkey

Nazli Ece Gungor

Department of Histology and Embryology, Medical Faculty, Akdeniz University, 07070, Antalya, Turkey

Bedriniam Dalkiran

Department of Pharmacology, Medical Faculty, Akdeniz University, 07070, Antalya, Turkey

Introduction. The aim of this study was to investigate whether activation of the nuclear enzyme poly(ADP-ribose) polymerase (PARP) contributes to the development of aldosterone-induced endothelial dysfunction and treatment with the potent PARP inhibitor 1,5-isoquinolinediol (3 mg/kg/day, i.p.) could prevent endothelial dysfunction caused by aldosterone.

Methods. Infusion of subpressor doses of aldosterone with subcutaneously implanted mini-osmotic pumps (0.05 mg/kg/day) to rats for 21 days induced the development of endothelial dysfunction. In order to evaluate endothelial function, isometric tension studies were performed in response to acetylcholine and sodium nitroprusside.Additionally, PAR (the end product of activated PARP) and PARP-1 expressions in the endothelium of thoracic aortas were evaluated by immunohistochemistry.

Results. There was a significant loss of endothelium-dependent vasodilatation in response to acetylcholine in aldosterone-infused rats. In animals treated with 1,5-isoquinolinediol, the effect of aldosterone on vascular responsiveness was less than the untreated groups. Immunohistochemical studies demonstrated that aldosterone administration increased PAR and PARP-1 expressions in the endothelium of thoracic aortas, whereas PARP inhibition decreased their expressions to control levels.

Conclusion. Our results indicate that PARP activation in the vascular system may be a contributory factor to the impaired endothelial function associated with aldosterone administration.

Key Words: aldosterone • aorta • endothelial dysfunction • PARP

References

Journal of Renin-Angiotensin-Aldosterone System, Vol. 10, No. 3, 127-137 (2009)
DOI: 10.1177/1470320309343655


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This Article
Right arrow Abstract Freely available
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Citing Articles
Right arrow Citing Articles via Scopus
Google Scholar
Right arrow Articles by Tasatargil, A.
Right arrow Articles by Dalkiran, B.
PubMed
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Right arrow Articles by Tasatargil, A.
Right arrow Articles by Dalkiran, B.
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