MFN1 and pulmonary arterial hypertension: For example, CBD can inhibit the expression of fission genes including mitochondrial fission 1 protein (FIS1), dynamin-1-like protein (DRP1) and optic atrophy type 1 (OPA1), and increase the expression of fusion genes, such as mitochondrial elongation factor (MIEF1), mitofusin 1 (Mfn1) and mitofusin 2 (Mfn2), in vitro model of pulmonary hypertension (Lu et al., 2021).