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We compared two rat PH models, monocrotaline-induced PAH (MCT-PAH) and chronic normobaric hypoxia (fractional inspired O2 10%), to address whether BMPR-II loss is common to PH and permits pathogenic TGF��1 signalling. Both models exhibited reduced lung BMPR-II expression, but increased TGF��1 signalling and decreased BMP signalling were observed only in MCT-PAH. Furthermore, a pharmacological ALK5 inhibitor prevented disease progression in the MCT-PAH model, but not in hypoxia. In vitro studies using human pulmonary artery smooth muscle cells showed that TGF��1 directly inhibits BMP�CSmad signalling. In conclusion, BMPR-II loss is common to the hypoxic and MCT-PAH models, but systemic ALK5 inhibition is effective only in the MCT model, highlighting a specific role for TGF��1 in vascular remodelling in MCT-PAH, potentially via direct inhibition of BMP signalling. The [https://en.wikipedia.org/wiki/Aldosterone Aldosterone] Dana Point classification of pulmonary hypertension (PH) defines pulmonary arterial hypertension (PAH) as a subset of the different forms of clinical PH (Simonneau et al. 2009). Pulmonary arterial hypertension can arise as a primary disease, generally with a heritable component, or may be associated with particular [http://www.selleckchem.com/products/MLN8237.html MLN8237 in vitro] drugs and toxins, connective tissue diseases and human immunodeficiency virus or schistosomiasis infection. Haemodynamically, PAH is defined as a resting mean pulmonary artery pressure (PAP) of >25 mmHg, pulmonary vascular resistance (PVR) >3 Wood units and pulmonary wedge pressure [http://www.selleckchem.com/products/wnt-c59-c59.html www.selleckchem.com/products/wnt-c59-c59.html] in the gene (BMPR2) encoding the bone morphogenetic protein type II receptor (BMPR-II) are associated with heritable PAH and with approximately 25% of patients with apparently sporadic PAH (Machado et al. 2009). The majority of BMPR2 mutations are predicted to cause haploinsufficiency and thus, reduced cell surface BMPR-II (Machado et al. 2009). Moreover, reduced BMPR-II may be important in other PH diseases, such as PH due to heart defects (Atkinson et al. 2002). Although BMPR2 mutations follow autosomal-dominant inheritance, only 20% of mutation carriers develop PAH, implying that additional environmental or genetic factors may precipitate disease and possibly drive disease progression (Machado et al. 2009).