The central focus of this project is to identify and elucidate the signal transduction mechanisms involved in the control of pulmonary vascular tone mediated by modulation of the production of the intracellular mediator of relaxation, cGMP, via regulation the soluble form of guanylate cyclase (sGC). We propose to (1) further define the role of peroxide metabolism via catalase in the mechanisms of pulmonary arterial relaxation and sGC activation by H2O2, (2) define the role of superoxide anion (endogenously or pharmacologically produced) as an inhibitory regulator of cGMP-mediated pulmonary arterial relaxation, (3) define roles for endothelium, the arginine-derived nitric oxide-like mediator and H2O2 in cGMP-associated responses of pulmonary arteries to changes in P02, and (4) to continue to elucidate the metabolic pathways which contribute to the action of vascular relaxants that activate sGC, including UV light, nitrovasodilator drugs (e.g. nitroglycerine and nitroprusside), endogenous nitrovasodilators and hydrazines (which generate carbon centered free radicals, e.g. hydralazine). The current proposal will employ isolated calf pulmonary arteries for tone studies with mechanistic probes, and measurements of endogenous reactive 02 species and cGMP production; arterial smooth muscle subcellular fractions to identify the metabolizing systems which generate activators and inhibitors of sGC, and sources of reactive 02 species that could function as tissue 02 sensors; and purified sGC from calf lungs in studies to establish molecular mechanisms for enzyme regulation by the processes described above. The processes examined in this proposal may contribute to further understanding aspects of hypoxic vasoconstriction, pulmonary vascular pathophysiology (e.g. ischemia reperfusion, hypertension, adult respiratory distress syndrome, etc.), the basic mechanisms of nitrovasodilator and hydrazine drug action, as well as, the photoreception of UV light.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL031069-11
Application #
2216755
Study Section
Experimental Cardiovascular Sciences Study Section (ECS)
Project Start
1984-04-01
Project End
1995-11-30
Budget Start
1994-04-01
Budget End
1995-11-30
Support Year
11
Fiscal Year
1994
Total Cost
Indirect Cost
Name
New York Medical College
Department
Physiology
Type
Schools of Medicine
DUNS #
City
Valhalla
State
NY
Country
United States
Zip Code
10595
Alhawaj, Raed; Patel, Dhara; Kelly, Melissa R et al. (2015) Heme biosynthesis modulation via ?-aminolevulinic acid administration attenuates chronic hypoxia-induced pulmonary hypertension. Am J Physiol Lung Cell Mol Physiol 308:L719-28
Patel, Dhara; Alhawaj, Raed; Wolin, Michael S (2014) Exposure of mice to chronic hypoxia attenuates pulmonary arterial contractile responses to acute hypoxia by increases in extracellular hydrogen peroxide. Am J Physiol Regul Integr Comp Physiol 307:R426-33
Patel, Dhara; Kandhi, Sharath; Kelly, Melissa et al. (2014) Dehydroepiandrosterone promotes pulmonary artery relaxation by NADPH oxidation-elicited subunit dimerization of protein kinase G 1?. Am J Physiol Lung Cell Mol Physiol 306:L383-91
Neo, Boon Hwa; Patel, Dhara; Kandhi, Sharath et al. (2013) Roles for cytosolic NADPH redox in regulating pulmonary artery relaxation by thiol oxidation-elicited subunit dimerization of protein kinase G1?. Am J Physiol Heart Circ Physiol 305:H330-43
Chettimada, Sukrutha; Rawat, Dhwajbahadur K; Dey, Nupur et al. (2012) Glc-6-PD and PKG contribute to hypoxia-induced decrease in smooth muscle cell contractile phenotype proteins in pulmonary artery. Am J Physiol Lung Cell Mol Physiol 303:L64-74
Wolin, Michael S (2012) Novel role for the regulation of mitochondrial fission by hypoxia inducible factor-1? in the control of smooth muscle remodeling and progression of pulmonary hypertension. Circ Res 110:1395-7
Gupte, Sachin A; Wolin, Michael S (2012) Relationships between vascular oxygen sensing mechanisms and hypertensive disease processes. Hypertension 60:269-75
Neo, Boon Hwa; Kandhi, Sharath; Wolin, Michael S (2011) Roles for redox mechanisms controlling protein kinase G in pulmonary and coronary artery responses to hypoxia. Am J Physiol Heart Circ Physiol 301:H2295-304
Wolin, Michael S (2011) Plasma glutathione peroxidase activity is potentially a key regulator of vascular disease-associated thrombosis. Circulation 123:1923-4
Suematsu, Nobuhiro; Ojaimi, Caroline; Recchia, Fabio A et al. (2010) Potential mechanisms of low-sodium diet-induced cardiac disease: superoxide-NO in the heart. Circ Res 106:593-600

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