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Oxidized fatty acids, such as hydroxyeicosatetraenoic acids (HETEs), play a critical role in PAH. We have previously established that dietary supplementation of 15-HETE is sufficient to cause PH in mice, suggesting a role for the gut-lung axis. However, the mechanisms are not known.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Approach<\/jats:title>\n                <jats:p>Analysis of RNA-seq data obtained from the lungs and intestines of mice on 15-HETE diet together with transcriptomic data from PAH patient lungs identified IFN inducible protein 44 (IFI44) as the only gene significantly upregulated in mice and humans. We demonstrate that IFI44 is also significantly increased in PBMCs from PAH patients. In mice, 15-HETE diet enhances IFI44 and its inducer IFN\u237a4 expression sequentially in the intestine first and then in the lungs. IFI44 expression in PAH is highly correlated with expression of Tumor Necrosis Factor Related Apoptosis Inducing Ligand (TRAIL), which is upregulated in CD8 cells in PH lungs of both mice and humans. We show that IFN\u03b14 produced by intestinal epithelial cells facilitates IFI44 expression in CD8 cells. Finally, we demonstrate that IFN receptor 1-KO in mice do not develop PH on 15-HETE diet. In addition, silencing IFI44 expression in the lungs of mice on 15-HETE diet prevents the development of PH and is associated with significantly lower expression of IFI44 and TRAIL in CD8 cells in the lungs.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Our data reveal a novel gut-lung axis driven by 15-HETE in PH.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12931-024-03046-z","type":"journal-article","created":{"date-parts":[[2024,11,28]],"date-time":"2024-11-28T14:08:42Z","timestamp":1732802922000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Intestinal IFN\u03b14 promotes 15-HETE diet-induced pulmonary hypertension"],"prefix":"10.1186","volume":"25","author":[{"given":"Gr\u00e9goire","family":"Ruffenach","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lejla","family":"Medzikovic","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laila","family":"Aryan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wasila","family":"Sun","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Long","family":"Lertpanit","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ellen","family":"O\u2019Connor","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ateyeh","family":"Dehghanitafti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohammad Reza","family":"Hatamnejad","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Srinivasa T.","family":"Reddy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mansoureh","family":"Eghbali","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,11,28]]},"reference":[{"key":"3046_CR1","doi-asserted-by":"publisher","first-page":"1801887","DOI":"10.1183\/13993003.01887-2018","volume":"53","author":"M Humbert","year":"2019","unstructured":"Humbert M, Guignabert C, Bonnet S, Dorfm\u00fcller P, Klinger JR, Nicolls MR, Olschewski AJ, Pullamsetti SS, Schermuly RT, Stenmark KR, Rabinovitch M. 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