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• W1995674013 abstract "During development, ciliary ganglionic neurons become postmitotic and extend neurites in apparent independence of the presence of their future intraocular innervation targets. After reaching their peripheral innervation territory, however, these neurons become target dependent and about half of them die. We have previously reported that chick embryo intraocular target tissues contain a ciliary neuronotrophic factor (CNTF), which can be extracted and partially purified in a soluble form and which ensures near-total survival of 8-day chick embryo ciliary ganglionic neurons in monolayer cultures. In this study we have dissociated and cultured ciliary ganglia from embryonic Day (ED) 5 through 14, and examined dependence and responsiveness of their neurons to exogenously added CNTF. Two cell classes (dark and bright) could be distinguished by phase microscopy and differentially counted in cell dissociates from ED7–14, but not in ED5–6 ones. Dark cell number per ganglion increased from 6000 to 78,000 over this developmental time period. In contrast, bright cells (putative neurons) declined from a maximum of about 10,000 to 6000, suggesting a correlation with the expected neuronal cell death in vivo. Dissociated cells from ED5–14 ganglia were seeded on a polyornithine substratum coated with neurite promoting factor, cultured for 24 hr with or without added CNTF, and numerically examined for survival and neuritic development. Cultures from ED7–14 ganglia showed two cell categories: (i) flat nonneuronal elements dramatically increased in number with ganglionic age (thereby correlating with the increasing number of dark cells in the dissociates) and (ii) large, bright cells (often displaying neurite outgrowth) decreased in number in parallel with bright cell number in the dissociate. The survival of these neuronal elements was strictly dependent on exogenously added CNTF between ED7 and 10, but became progressively independent with older ages. ED14 neurons (fully capable of surviving for 24 hr without added CNTF) continued to require CNTF for neurite extension, thus displaying retained sensitivity to this factor. Although the ED5–6 cultures contained well-recognizable flat cells, the dominant category comprised cells with variable morphology, practically all of which exhibited neurite-like processes. Both the survival and neurite extension of these cells, which we tentatively interpret as immature neurons were independent of the presence of added CNTF." @default.
• W1995674013 created "2016-06-24" @default.
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• W1995674013 date "2014-07-01" @default.
• W1995674013 modified "2023-10-18" @default.
• W1995674013 title "Methylphenidate dose response characteristics of caudate nucleus neuronal activity correlated with animal behavior" @default.
• W1995674013 doi "https://doi.org/10.1016/j.drugalcdep.2014.02.116" @default.
• W1995674013 hasPublicationYear "2014" @default.
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