Vasorelaxant and antiaggregatory actions of the nitroxyl donor isopropylamine NONOate are maintained in hypercholesterolemia

Bullen, M.L., Miller, A.A. , Dharmarajah, J., Drummond, G.R., Sobey, C. G. and Kemp-Harper, B.K. (2011) Vasorelaxant and antiaggregatory actions of the nitroxyl donor isopropylamine NONOate are maintained in hypercholesterolemia. AJP: Heart and Circulatory Physiology, 301(4), H1405-H1414. (doi: 10.1152/ajpheart.00489.2011) (PMID:21803947)

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Nitroxyl (HNO) displays pharmacological and therapeutic actions distinct from those of its redox sibling nitric oxide (NO∙). It remains unclear, however, whether the vasoprotective actions of HNO are preserved in disease. The ability of the HNO donor isopropylamine NONOate (IPA/NO) to induce vasorelaxation, its susceptibility to tolerance development, and antiaggregatory actions were compared with those of a clinically used NO∙ donor, glyceryl trinitrate (GTN), in hypercholesterolemic mice. The vasorelaxant and antiaggregatory properties of IPA/NO and GTN were examined in isolated carotid arteries and washed platelets, respectively, from male C57BL/6J mice [wild-type (WT)] maintained on either a normal diet (WT-ND) or high fat diet (WT-HFD; 7 wk) as well as apolipoprotein E-deficient mice maintained on a HFD (ApoE−/−-HFD; 7 wk). In WT-ND mice, IPA/NO (0.1–30 μmol/l) induced concentration-dependent vasorelaxation and inhibition of collagen (30 μg/ml)-stimulated platelet aggregation, which was predominantly soluble guanylyl cyclase/cGMP dependent. Compared with WT-HFD mice, ApoE−/−-HFD mice displayed an increase in total plasma cholesterol levels (P < 0.001), vascular (P < 0.05) and platelet (P < 0.05) superoxide (O2·−) production, and reduced endogenous NO∙ bioavailability (P < 0.001). Vasorelaxant responses to both IPA/NO and GTN were preserved in hypercholesterolemia, whereas vascular tolerance developed to GTN (P < 0.001) but not to IPA/NO. The ability of IPA/NO (3 μmol/l) to inhibit platelet aggregation was preserved in hypercholesterolemia, whereas the actions of GTN (100 μmol/l) were abolished. In conclusion, the vasoprotective effects of IPA/NO were maintained in hypercholesterolemia and, thus, HNO donors may represent future novel treatments for vascular diseases.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Miller, Dr Alyson
Authors: Bullen, M.L., Miller, A.A., Dharmarajah, J., Drummond, G.R., Sobey, C. G., and Kemp-Harper, B.K.
College/School:College of Medical Veterinary and Life Sciences > School of Cardiovascular & Metabolic Health
Journal Name:AJP: Heart and Circulatory Physiology
Publisher:American Physiological Society
ISSN (Online):1522-1539

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