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- W2004336074 abstract "Application of ouabain to the intact round-window (RW) membrane of the gerbil cochlea induces apoptosis in most spiral ganglion neurons (SGNs), leaving a few neurons intact (Schmiedt et al. 2002). Here, physiological measures and immunostaining were used to examine the process of SGN degeneration at 3, 6, 12, and 24 h, 4 days, and 1 and 5 months after ouabain treatment. The few remaining neurons surviving up to 5 months after ouabain treatment were immunoreactive for peripherin, a type II neuron marker. Peripherin-positive cell counts indicate that about 7% of the SGNs in the gerbil cochlea are type II neurons, and these neurons survive intact after ouabain treatment. Ouabain exposure had little effect on the outer hair cell and lateral wall systems, even after a 5 month loss of auditory-nerve function. The cellular locations of cytochrome c, poly (ADP-ribose) polymerase (PARP), and activated caspase 3 were examined in control and ouabain-treated cochleas. A redistribution of cytochrome c in peripherin-negative (type I) neurons was observed at 3 h after ouabain exposure. Degraded PARP and activated caspase 3 were also detected in peripherin-negative SGNs at 6 and 24 h after treatment, respectively. These results suggest that the redistribution of cytochrome c is an early event during apoptosis in type I SGNs and that activation of PARP and caspase 3 are associated with apoptosis in these cells. Calcineurin and NF-kappaB are two important signaling pathways that may modulate cell survival in the central nervous system. Here, we found that calcineurin and NF-kappaB selectively labeled type II neurons. It is speculated that the high levels of calcineurin and NF-kappaB in type II SGNs, as compared with type I SGNs, may play protective roles in enhancing the survival of type II neurons exposed to ouabain." @default.
- W2004336074 created "2016-06-24" @default.
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- W2004336074 date "2005-03-01" @default.
- W2004336074 modified "2023-10-15" @default.
- W2004336074 title "Ouabain Induces Apoptotic Cell Death in Type I Spiral Ganglion Neurons, but not Type II Neurons" @default.
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- W2004336074 doi "https://doi.org/10.1007/s10162-004-5021-6" @default.
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