作者: KH Sonnenfeld , DN Ishii
DOI: 10.1523/JNEUROSCI.05-07-01717.1985
关键词: Biophysics 、 Nerve growth factor 、 Trypsin 、 Binding site 、 Neuroblastoma 、 Neurite 、 Endocrinology 、 Nerve growth factor binding 、 Liaison 、 Internal medicine 、 Chemistry 、 Cell 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