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- W2020246454 abstract "Loss of postnatal mammalian auditory hair cells (HCs) is irreversible. Earlier studies have highlighted the importance of the Retinoblastoma family of proteins (pRBs) (i.e., Rb1, Rbl1/p107, and Rbl2/p130) in the auditory cells’ proliferation and emphasized our lack of information on their specific roles in the auditory system. We have previously demonstrated that lack of Rbl2/p130 moderately affects HCs’ and supporting cells’ (SCs) proliferation. Here, we present evidence supporting multiple roles for Rbl1/p107 inthe developing and mature mouse organ of Corti (OC). Like other pRBs, Rbl1/p107 is expressed in the OC, particularly in the Hensen’s and Deiters’ cells. Moreover, Rbl1/p107 impacts maturation and postmitotic quiescence of HCs and SCs, as evidenced by enhanced numbers of these cells and the presence of dividing cells in the postnatal Rbl1/p107－/－OC. These findings were further supported by microarray and bioinformatics analyses, suggesting downregulation of several bHLH molecules, as well as activation of the Notch/Hes/Hey signaling pathway in homozygous Rbl1/p107 mutant mice. Physiological assessments and detection of ectopic HC marker expression in postnatal spiral ganglion neurons (SGNs) provided evidence for incomplete cell maturation and differentiation in Rbl1/p107﹣/﹣OC. Collectively, the present study highlights an important role for Rbl1/p107 inOC cell differentiation and maturation, which is distinct from other pRBs." @default.
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- W2020246454 date "2013-01-01" @default.
- W2020246454 modified "2023-10-16" @default.
- W2020246454 title "Lack of <i>Rbl</i>1/p107 Effects on Cell Proliferation and Maturation in the Inner Ear" @default.
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- W2020246454 doi "https://doi.org/10.4236/jbbs.2013.37056" @default.
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