Implication of GPRASP2 in the Proliferation and Hair Cell-Forming of Cochlear Supporting Cells

G protein-coupled receptor-associated sorting protein 2 (GPRASP2) has been identified as the causative gene for X-linked recessive syndromic hearing loss (SHL) in our previous study. However, the role of GPRASP2 in auditory function remains unclear. The present study demonstrated that Gprasp2 overex...

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Published in:Cell proliferation 2024-12, p.e13792
Main Authors: Cai, Jing, Huang, Kun, Li, Wenrui, Wang, Tianming, Yue, Shen, Chen, Zhibin, Xing, Guangqian, Wei, Qinjun, Yao, Jun, Cao, Xin
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container_title Cell proliferation
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creator Cai, Jing
Huang, Kun
Li, Wenrui
Wang, Tianming
Yue, Shen
Chen, Zhibin
Xing, Guangqian
Wei, Qinjun
Yao, Jun
Cao, Xin
description G protein-coupled receptor-associated sorting protein 2 (GPRASP2) has been identified as the causative gene for X-linked recessive syndromic hearing loss (SHL) in our previous study. However, the role of GPRASP2 in auditory function remains unclear. The present study demonstrated that Gprasp2 overexpression in mouse organoids promoted the proliferation of supporting cells (SCs), which was mainly mediated by the Hedgehog signalling pathway. Meanwhile, GPRASP2 promoted hair cell (HC) formation from SCs via β-catenin signalling. In addition, GPRASP2 deficiency resulted in increased lysosomal degradation of SMO protein, leading to decreased expression of β-catenin and the Hedgehog pathway transcription factor GLI1. In neomycin-treated mouse cochlear explant, the smoothened agonist (SAG) recured the HC loss and further facilitated AAV-ie-Gprasp2 to promote the proliferation of SCs and formation of HCs. Our results suggested that GPRASP2 could be a potential candidate for gene therapy in the regeneration of HCs.
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title Implication of GPRASP2 in the Proliferation and Hair Cell-Forming of Cochlear Supporting Cells
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