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• W1990291276 abstract "Spiral ganglion Schwann cells (SGSCs) myelinate spiral ganglion neurons (SGNs) and represent a potential source of neurotrophic support for SGNs. Deafening due to loss of hair cells results in gradual degeneration and death of SGNs. Successful efforts to maintain or regenerate a functional auditory nerve may depend on a healthy population of SGSCs, yet the responses of SGSCs to neural injury remain largely unknown. Here we investigate the role of p75NTR in SGSC responses to gradual denervation. Following deafening, SGSCs in the osseous spiral lamina (OSL) and, subsequently, in Rosenthal's canal (RC) expressed elevated p75NTR compared to hearing controls. p75NTR-positive cells co-labeled with S100 and RIP antibodies (Schwann cell markers), but not with anti-neurofilament. The pattern of p75NTR expression mirrored the pattern of neural degeneration, beginning in the OSL of the cochlea base and later extending into the apex. SGSCs expressed sortilin, a p75NTR co-receptor for pro-neurotrophins. Both pro-nerve growth factor (pro-NGF) and pro-brain derived neurotrophic factor (proBDNF) induced apoptosis in cultured SGSCs. Deafened animals exhibited significantly higher levels of SGSC proliferation (as measured by BrdU uptake) compared to hearing animals while total Schwann cell density remained stable, suggesting a tight regulation of SGSC proliferation and cell death. SGSCs undergoing cell division lose p75NTR expression from the cell surface and demonstrate nuclear localization of the intracellular domain (ICD), raising the possibility that p75NTR cleavage and ICD nuclear localization regulate SGSC proliferation. These results suggest that p75NTR contributes to SGSC responses to deafening and neural degeneration." @default.
• W1990291276 created "2016-06-24" @default.
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• W1990291276 date "2011-08-01" @default.
• W1990291276 modified "2023-10-16" @default.
• W1990291276 title "p75NTR expression and nuclear localization of p75NTR intracellular domain in spiral ganglion Schwann cells following deafness correlate with cell proliferation" @default.
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• W1990291276 doi "https://doi.org/10.1016/j.mcn.2011.05.010" @default.
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