Eosinophils protect against pulmonary hypertension through 14-HDHA and 17-HDHA.

"Conflict of interest: No competing interests to declare."

"Sources of funding: This work was supported by the by CAMS Innovation Fund for Medical Sciences (2021-I2M-1-049 to J. Wang, 2022-I2M-JB-007 to C. Wang, 2021-I2M-1-005 to Y. Xing, 2021-I2M-1-023 to T. Shu), Beijing Natural Science Foundation (Z220019 to J. Wang), Haihe Laboratory of Cell Ecosystem Innovation Fund (HH22KYZX0010 to J. Wang), the National Key Research and Development Program of China (2019YFA0802600 to J. Wang), the National Natural Science Foundation of China (81901588 to Y. Xing), the Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences (2019JB310001 and 2018JB31001 to C. Wang), State Key Laboratory Special Fund (2060204 to C. Wang) and the Fundamental Research Funds for the Central Universities (3332022141 to J. Zhang). Funding information for this article has been deposited with the Crossref Funder Registry."