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- W2010184564 abstract "The preceding paper (P. Bernd and J. Represa, 1989, Dev. Biol. 134) describes the characterization and localization of nerve growth factor (NGF) receptors in inner ear primordia, the otic vesicle (OV) and cochleovestibular ganglion (CVG), obtained from 72-hr (stage 19-20) quail embryos. The studies described in this paper investigated whether NGF serves as a mitogen, a survival factor, and/or a differentiation factor in this system. Explants of isolated OV and CVG were maintained for 24 hr in serum-free medium alone (M-199), M-199 containing serum, M-199 containing NGF, or M-199 containing both serum and NGF. [3H]Thymidine was also present for the entire culture period. Both OV and CVG incorporated greater amounts of [3H]thymidine in the presence of serum or NGF, and their combined effect was additive. NGF's effects were dose dependent, saturable, and specific (blocked by anti-NGF). NGF caused little or no morphological differentiation of OV and no increase in protein levels, in contrast to OV grown in the presence of serum. CVG had both cochlear and vestibular portions present in all cases, but the apparent size and protein content of CVG was increased in the presence of either serum or NGF. Effects of serum and NGF were completely, but reversibly, blocked by amiloride, suggesting that the Na+-H+ exchange system had been activated. In order to determine whether increases in [3H]thymidine incorporation were due to increased cell survival or perhaps to an increase in proliferation, explants were initially grown for a 24-hr period in serum-free medium, followed by reactivation for an additional 24 hr in medium containing serum and/or NGF. It is likely that cells requiring either serum or NGF for survival would die during a 24-hr period in their absence. Our results revealed that the level of [3H]thymidine incorporation in OV was the same after reactivation. In the case of CVG, only NGF treatment yielded similar results; [3H]thymidine incorporation was lower in CVG reactivated with serum. It appears, therefore, that serum has probable proliferative effects upon OV and CVG, as well as survival effects for CVG. NGF, however, does not appear to affect survival in either OV or CVG, so that increases in [3H]thymidine incorporation in response to NGF are most likely due to proliferative effects upon OV or CVG, at least at this embryonic stage." @default.
- W2010184564 created "2016-06-24" @default.
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- W2010184564 date "1989-07-01" @default.
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- W2010184564 title "Nerve growth factor and serum differentially regulate development of the embryonic otic vesicle and cochleovestibular ganglion in vitro" @default.
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- W2010184564 doi "https://doi.org/10.1016/0012-1606(89)90074-2" @default.
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