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We investigated whether magnesium sulfate (MgSO 4 ) mitigated pulmonary hypertension progression in rats. Pulmonary hypertension was induced by a single intraperitoneal injection of monocrotaline (60 mg/kg). MgSO 4 (100 mg/kg) was intraperitoneally administered daily for 3 weeks, from the seventh day after monocrotaline injection. Adult male rats were randomized into monocrotaline (MCT) or monocrotaline plus MgSO 4 (MM) groups ( n = 15 per group); control groups were maintained simultaneously. For analysis, surviving rats were euthanized on the 28 th day after receiving monocrotaline. The survival rate was higher in the MM group than in the MCT group (100% versus 73.3%, p = 0.043). Levels of pulmonary artery wall thickening, α-smooth muscle actin upregulation, right ventricular systolic pressure increase, and right ventricular hypertrophy were lower in the MM group than in the MCT group (all p &lt; 0.05). Levels of lipid peroxidation, mitochondrial injury, inflammasomes and cytokine upregulation, and apoptosis in the lungs and right ventricle were lower in the MM group than in the MCT group (all p &lt; 0.05). Notably, the mitigation effects of MgSO 4 on pulmonary artery wall thickening and right ventricular hypertrophy were counteracted by exogenous calcium chloride. In conclusion, MgSO 4 mitigates pulmonary hypertension progression, possibly by antagonizing calcium.

Magnesium Sulfate Mitigates the Progression of Monocrotaline Pulmonary Hypertension in Rats