DNM1L and pulmonary arterial hypertension: Mitochondrial division inhibitor 1 (Mdivi-1), a selective Drp1 GTPase activity inhibitor (Cassidy-Stone et al., 2008), inhibits mitochondrial fission and reduces proliferation in PASMC from PAH patients and improves hemodynamics in vivo in animal models of pulmonary hypertension (Marsboom et al., 2012).