The PI3K-AKT-mTOR signaling pathway mediates the cytoskeletal remodeling and epithelial-mesenchymal transition in bladder outlet obstruction
Zhaoxia Zhang,
Chenghao Zhanghuang,
Tao Mi,
Liming Jin,
Jiayan Liu,
Maoxian Li,
Xin Wu,
Jinkui Wang,
Mujie Li,
Zhang Wang,
Peng Guo,
Dawei He
Affiliations
Zhaoxia Zhang
Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China; Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China; China International Science and Technology Cooperation Base of Child Development and Critical, National Clinical Research Center for Child Health and Disorders, Chongqing, PR China; Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China
Chenghao Zhanghuang
Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China; Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China; China International Science and Technology Cooperation Base of Child Development and Critical, National Clinical Research Center for Child Health and Disorders, Chongqing, PR China; Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China; Department of Urology, Children's Hospital Affiliated to Kunming Medical University, Kunming, Yunnan, 650103, PR China
Tao Mi
Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China; Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China; China International Science and Technology Cooperation Base of Child Development and Critical, National Clinical Research Center for Child Health and Disorders, Chongqing, PR China; Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China
Liming Jin
Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China; Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China; China International Science and Technology Cooperation Base of Child Development and Critical, National Clinical Research Center for Child Health and Disorders, Chongqing, PR China; Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China
Jiayan Liu
Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China; Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China; China International Science and Technology Cooperation Base of Child Development and Critical, National Clinical Research Center for Child Health and Disorders, Chongqing, PR China; Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China
Maoxian Li
Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China; Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China; China International Science and Technology Cooperation Base of Child Development and Critical, National Clinical Research Center for Child Health and Disorders, Chongqing, PR China; Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China
Xin Wu
Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China; Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China; China International Science and Technology Cooperation Base of Child Development and Critical, National Clinical Research Center for Child Health and Disorders, Chongqing, PR China; Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China
Jinkui Wang
Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China; Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China; China International Science and Technology Cooperation Base of Child Development and Critical, National Clinical Research Center for Child Health and Disorders, Chongqing, PR China; Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China
Mujie Li
Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China; Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China; China International Science and Technology Cooperation Base of Child Development and Critical, National Clinical Research Center for Child Health and Disorders, Chongqing, PR China; Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China
Zhang Wang
Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China; Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China; China International Science and Technology Cooperation Base of Child Development and Critical, National Clinical Research Center for Child Health and Disorders, Chongqing, PR China; Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China
Peng Guo
Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China; Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China; China International Science and Technology Cooperation Base of Child Development and Critical, National Clinical Research Center for Child Health and Disorders, Chongqing, PR China; Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China; Institute of Basic Medicine and Cancer (IBMC), Chinese Academy of Sciences, Hangzhou, Zhejiang, 310022, PR China
Dawei He
Department of Urology, Children's Hospital of Chongqing Medical University, Chongqing, 400014, PR China; Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering, Chongqing, 400014, PR China; China International Science and Technology Cooperation Base of Child Development and Critical, National Clinical Research Center for Child Health and Disorders, Chongqing, PR China; Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, PR China; Corresponding authorDepartment of Urology, Children's Hospital of Chongqing Medical University, Yuzhong District, Chongqing, 400014, PR China.
Objective: Partial bladder outlet obstruction(pBOO) is the most common cause of lower urinary tract symptoms (LUTS) and significantly affects the quality of life. Long-term pBOO can cause changes in bladder structure and function, referred to as bladder remodeling. The pathogenesis of pBOO-induced bladder remodeling has yet to be fully understood, so effective treatment options are lacking. Our study aimed to explore how pBOO-induced bladder remodeling brings new strategies for treating pBOO. Methods: A rat model of pBOO was established by partial ligation of the bladder neck, and the morphological changes and fibrosis changes in the bladder tissues were detected by H&E and Masson trichrome staining. Furthermore, EMT(epithelial-mesenchymal transition) related indicators and related pathway changes were further examined after TGF- β treatment of urothelial cells SV-HUC-1. Finally, the above indicators were tested again after using the PI3K inhibitor. Subsequently, RNA sequencing of bladder tissues to identify differential genes and related pathways enrichment and validated by immunofluorescence and western blotting analysis. Results: The pBOO animal model was successfully established by partially ligating the bladder neck. H&E staining showed significant changes in the bladder structure, and Masson trichrome staining showed significantly increased collagen fibers. RNA sequencing results significantly enriched in the cytoskeleton, epithelial-mesenchymal transformation, and the PI3K-AKT-mTOR signaling pathway. Immunofluorescence and western blotting revealed EMT and cytoskeletal remodeling in SV-HUC-1 cells after induction of TGF- β and in the pBOO bladder tissues. The western blotting showed significant activation of the PI3K-AKT-mTOR signaling pathway in SV-HUC-1 cells after induction of TGF-β and in pBOO bladder tissues. Furthermore, EMT and cytoskeletal damage were partially reversed after PI3K pathway inhibition using PI3K inhibitors. Conclusions: In the pBOO rat model, the activation of the PI3K-AKT-mTOR signaling pathway can mediate the cytoskeletal remodeling and the EMT to induce fibrosis in the bladder tissues. PI3K inhibitors partially reversed EMT and cytoskeletal damage.
