• Am. J. Physiol. Lung Cell Mol. Physiol. · Oct 2009

    The soluble guanylate cyclase activator HMR1766 reverses hypoxia-induced experimental pulmonary hypertension in mice.

    • Norbert Weissmann, Sascha Hackemack, Bhola Kumar Dahal, Soni Savai Pullamsetti, Rajkumar Savai, Manish Mittal, Beate Fuchs, Thomas Medebach, Rio Dumitrascu, Martin van Eickels, Hossein Ardeschir Ghofrani, Werner Seeger, Friedrich Grimminger, and Ralph Theo Schermuly.
    • Univ. of Giessen Lung Center Medical Clinic II/V, Klinikstr. 36, 35392 Giessen, Germany.
    • Am. J. Physiol. Lung Cell Mol. Physiol. 2009 Oct 1;297(4):L658-65.

    AbstractSevere pulmonary hypertension (PH) is a disabling disease with high mortality, characterized by pulmonary vascular remodeling and right heart hypertrophy. In mice with PH induced by chronic hypoxia, we examined the acute and chronic effects of the soluble guanylate cyclase (sGC) activator HMR1766 on hemodynamics and pulmonary vascular remodeling. In isolated perfused mouse lungs from control animals, HMR1766 dose-dependently inhibited the pressor response of acute hypoxia. This dose-response curve was shifted leftward when the effects of HMR1766 were investigated in isolated lungs from chronic hypoxic animals for 21 days at 10% oxygen. Mice exposed for 21 or 35 days to chronic hypoxia developed PH, right heart hypertrophy, and pulmonary vascular remodeling. Treatment with HMR1766 (10 mg x kg(-1) x day(-1)), after full establishment of PH from day 21 to day 35, significantly reduced PH, as measured continuously by telemetry. In addition, right ventricular (RV) hypertrophy and structural remodeling of the lung vasculature were reduced. Pharmacological activation of oxidized sGC partially reverses hemodynamic and structural changes in chronic hypoxia-induced experimental PH.

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