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A recent study from our group demonstrated that the Ca(2+)-sensing receptor (CaSR) was upregulated, and the extracellular Ca(2+)-induced increase in cytosolic Ca(2+) concentration ([Ca(2+)]cyt) was enhanced in pulmonary arterial smooth muscle cells from patients with idiopathic pulmonary arterial hypertension and animals with experimental pulmonary hypertension (PH). However, it is unclear whether CaSR antagonists (for example, NPS2143) rescue the development of experimental PH. We tested the rescue effects of NPS2143 in rats with monocrotaline (MCT)-induced PH and mice with chronic hypoxia-induced PH. For the NPS2143 treatment group, rats and mice were i.p. injected with NPS2143 once per day from days 14 to 24. Four weeks after MCT injection or exposure to normobaric hypoxia, the right ventricular (RV) systolic pressure, right heart hypertrophy (RV/LV+S ratio) and RV myocardial fibrosis were rescued or nearly restored to normal levels by NPS2143 treatment. The rescue effects of NPS2143 on experimental PH further support a critical role for the CaSR in the PH mechanism. Therefore, NPS2143 may be a promising potential treatment for pulmonary arterial hypertension.

Inhibition of the Ca2+-sensing receptor rescues pulmonary hypertension in rats and mice