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egr1 and egr4 regulate zebrafish renal regeneration by promoting foxm1 expression
Xian He1,2,3 , Yuhua Sun1,2,3,4,*
1Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
2The Innovation of Seed Design, Chinese Academy of Sciences, Wuhan 430072, China
3College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
4Hubei Hongshan Laboratory, Wuhan 430070, China
*Correspondence to:Yuhua Sun , Email:sunyh@ihb.ac.cn
J Mol Cell Biol, Volume 17, Issue 6, June 2025, mjaf026,  https://doi.org/10.1093/jmcb/mjaf026
Keyword: early growth response factors, renal regeneration, proliferation, apoptosis, foxm1, AKI

Early growth response (Egr) factors are involved in tissue development and repair. However, few studies have focused on the role of egr genes in renal regeneration after acute kidney injury (AKI) and the underlying mechanisms. In this study, we observed that egr1 and egr4 were sharply upregulated in wild type zebrafish at 1 day post-injury by gentamicin. Further experiments with egr1 and egr4 mutants showed that egr1 and egr4 were involved in zebrafish renal regeneration after AKI by regulating the proliferation and apoptosis of tubular cells. foxm1 is expressed in injured kidneys and involved in kidney repair. Loss of foxm1 inhibited zebrafish renal regeneration by decreasing the proliferation and increasing the apoptosis of tubular cells. Moreover, Egr1 and Egr4 promoted foxm1 expression by directly binding to the foxm1 promoter, thus regulating renal regeneration. Our results revealed that the rapid and transient induction of egr1 and egr4 after AKI exerts a renoprotective role through upregulating foxm1 to facilitate kidney regeneration. Therefore, the egr1/egr4foxm1 regulatory axis holds a therapeutic potential for the treatment of AKI.