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- W1969435114 abstract "The response of wild-type and genetically engineered neuroectodermal tumor (NET) cells to exogenous and endogenously synthesized nerve growth factor (NGF) was investigated. Differences in cell proliferation rate, neurite formation, and expression of NGF binding sites were quantitatively determined. Ecotropic retroviral vectors were used to transfer the genes for beta-galactosidase (beta-GAL) and NGF into wild-type C-1300 and Neuro-2A murine neuroblastoma (MNB) and rat pheochromocytoma (PC-12) cells. Conditioned media obtained from NET cells infected with the NGF gene contained biologically active NGF, whereas media from beta-GAL infected cells did not. Infection with the NGF vector induced a short-term decrease in cell proliferation rate and increased neurite formation in wild-type, substrate-adherent PC-12 and Neuro-2A MNB cells (P > 0.05). Incubation of wild-type C-1300, Neuro-2A MNB, and PC-12 cells with NGF (0-200 ng/ml) for 5 days significantly reduced proliferation rates in a concentration-dependent manner and increased neurite extrusion. All NGF-NET cells had a significantly diminished response to the antiproliferative action of exogenous NGF. Ligand binding assays with 125I-NGF demonstrated a marked reduction in the number of NGF binding sites on NGF-NET cells compared to wild type. The attenuated response of NGF-NET cells to exogenous NGF correlated positively with the down-regulation of NGF binding sites. In conclusion, beta-NGF gene transfer into wild-type NET cells induces the synthesis and secretion of NGF, temporarily decreases cell proliferation rate, increases neurite extrusion, down-regulates NGF binding sites, and reduces NET cell responsiveness to NGF. A putative role for NGF may be the modulation of NET cell proliferation and differentiation." @default.
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- W1969435114 date "2000-01-15" @default.
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- W1969435114 title "Retroviral transfer of the ?-nerve growth factor gene into murine neuroectodermal tumor cells modulates cell proliferation rate, neurite formation, and NGF binding site expression" @default.
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- W1969435114 doi "https://doi.org/10.1002/(sici)1097-4547(20000115)59:2<265::aid-jnr13>3.0.co;2-1" @default.
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