Omega-3 fatty acid epoxides produced by PAF-AH2 in mast cells regulate pulmonary vascular remodeling.
Hidenori MoriyamaJin EndoMasaharu KataokaYuta ShimanakaNozomu KonoYuki SugiuraShinichi GotoHiroki KitakataTakahiro HiraideNaohiro YoshidaSarasa IsobeTsunehisa YamamotoKohsuke ShirakawaAtsushi AnzaiYoshinori KatsumataMakoto SuematsuKenjiro KosakiKeiichi FukudaHiroyuki AraiMotoaki SanoPublished in: Nature communications (2022)
Pulmonary hypertension is a fatal rare disease that causes right heart failure by elevated pulmonary arterial resistance. There is an unmet medical need for the development of therapeutics focusing on the pulmonary vascular remodeling. Bioactive lipids produced by perivascular inflammatory cells might modulate the vascular remodeling. Here, we show that ω-3 fatty acid-derived epoxides (ω-3 epoxides) released from mast cells by PAF-AH2, an oxidized phospholipid-selective phospholipase A2, negatively regulate pulmonary hypertension. Genetic deletion of Pafah2 in mice accelerate vascular remodeling, resulting in exacerbation of hypoxic pulmonary hypertension. Treatment with ω-3 epoxides suppresses the lung fibroblast activation by inhibiting TGF-β signaling. In vivo ω-3 epoxides supplementation attenuates the progression of pulmonary hypertension in several animal models. Furthermore, whole-exome sequencing for patients with pulmonary arterial hypertension identifies two candidate pathogenic variants of Pafah2. Our findings support that the PAF-AH2-ω-3 epoxide production axis could be a promising therapeutic target for pulmonary hypertension.
Keyphrases
- pulmonary hypertension
- pulmonary arterial hypertension
- fatty acid
- pulmonary artery
- heart failure
- genome wide
- copy number
- healthcare
- chronic obstructive pulmonary disease
- signaling pathway
- gene expression
- small molecule
- metabolic syndrome
- atrial fibrillation
- type diabetes
- left ventricular
- extracorporeal membrane oxygenation
- cell proliferation
- endoplasmic reticulum stress
- cell death