Fast and slow nerve growth factor binding sites in human neuroblastoma and rat pheochromocytoma cell lines: relationship of sites to each other and to neurite formation

作者: KH Sonnenfeld , DN Ishii

DOI: 10.1523/JNEUROSCI.05-07-01717.1985

关键词: BiophysicsNerve growth factorTrypsinBinding siteNeuroblastomaNeuriteEndocrinologyNerve growth factor bindingLiaisonInternal medicineChemistryCell culture

摘要: We studied (a) the distribution and properties of fast slow 125I- nerve growth factor (125I-NGF) binding sites in cultured human neuroblastoma (NB) cell lines that were categorized as responsive (N+) or unresponsive (N-) to NGF by neurite outgrowth, (b) whether mediate actions NGF, (c) NGF-mediated conversion occurs NB pheochromocytoma PC 12 cells. In SH-SY5Y cells, trypsin resistant was high affinity. Loss had a half-time 25 30 min at 37 degrees C very 4 C. contrast, sensitive lower affinity; its dissociation less than 1 The association rate constants both about 0.8 1.2 X 10(7) M-1 sec-1. Some cells sites. N+ LA-N-5 only Despite virtual elimination MC-IXC remaining could still efficiently bind 125I-NGF. These observations showed are not required for site binding, other demonstrated some 125I-NGF initially bound directly transferred conversion. PC12 2 kinetics consistent with simple bimolecular reactions combined evidence did support hypothesis

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