TLR4 and pulmonary arterial hypertension: Given the similar role of TLRs (TLR2 and TLR4)/NF‐κB pathway in the development of MCT‐induced PAH, inhibiting of TLRs/NF‐κB pathway may also provide potential clinical implications in patients with PAH, including attenuated inflammatory/immune response and pulmonary vascular remodelling.