Verdi J M, Groves A K, Fariñas I, Jones K, Marchionni M A, Reichardt L F, Anderson D J
Division of Biology 216-76, California Institute of Technology, Pasadena 91125, USA.
Neuron. 1996 Mar;16(3):515-27. doi: 10.1016/s0896-6273(00)80071-9.
Neurotrophin 3 (NT-3) can support the survival of some embryonic sympathetic neuroblasts before they become nerve growth factor dependent. We show that NT-3 is produced in vivo by nonneuronal cells neighboring embryonic sympathetic ganglia. NT-3 mRNA is produced by these nonneuronal cells in vitro and is up-regulated by platelet-derived growth factor, ciliary neurotrophic factor, and glial growth factor 2 (a neuregulin). Nonneuronal cell-conditioned medium promotes survival and induces TrkA expression in isolated sympathetic neuroblasts, and this activity is blocked by anti-NT-3 antibody. Neuroblasts also enhance NT-3 production by nonneural cells. Neuroblasts synthesize several forms of neuregulin, and antibodies to neuregulin attenuate the effect of the neuroblasts on the nonneuronal cells. These data suggest a reciprocal cell-cell interaction, in which neuroblast-derived neuregulins promote NT-3 production by neighboring nonneuronal cells, which in turn promotes neuroblast survival and further differentiation.
神经营养因子3(NT-3)能够在某些胚胎交感神经母细胞变得依赖神经生长因子之前,支持它们的存活。我们发现,NT-3在体内由胚胎交感神经节附近的非神经元细胞产生。这些非神经元细胞在体外可产生NT-3 mRNA,并且血小板衍生生长因子、睫状神经营养因子和神经胶质生长因子2(一种神经调节蛋白)可使其上调。非神经元细胞条件培养基可促进分离出的交感神经母细胞的存活并诱导TrkA表达,而这种活性可被抗NT-3抗体阻断。神经母细胞也会增强非神经细胞的NT-3产生。神经母细胞可合成多种形式的神经调节蛋白,而针对神经调节蛋白的抗体可减弱神经母细胞对非神经元细胞的作用。这些数据表明存在一种相互的细胞间相互作用,即神经母细胞衍生的神经调节蛋白促进相邻非神经元细胞产生NT-3,而NT-3反过来又促进神经母细胞的存活和进一步分化。