HIF‐1α induced FGF18 alleviates renal ischemia/reperfusion injury via YAP

Abstract Acute kidney injury (AKI) is a devastating clinical condition characterized by an abrupt loss of renal function. The pathophysiology of AKI involves diverse processes and elements, of which survival and regeneration have been established to be significant hallmarks. And early studies have confirmed the fundamental role of FGFs in the regulation of AKI pathology, although the association between FGF18 and AKI still remains elusive. Our study demonstrates a substantial up‐regulation of FGF18 in the renal tubules of mice subjected to ischemia. Notably, targeted overexpression of FGF18 effectively mitigates the impairment of kidney function induced by AKI. Mechanistically, FGF18 facilitates cell proliferation and anti‐apoptosis in RTECs by enhancing the expression of YAP and facilitating its translocation to the nucleus. Aside from that, we also discovered that the substantial expression of FGF18 under ischemic conditions is HIF‐1α dependent. This study aims to uncover the inherent mechanism behind the beneficial effects of FGF18 in attenuating AKI. By doing so, it aims to offer novel insights into the development of therapeutic strategies for AKI.