REGULATED NEUROTROPHIN RECEPTOR RESPONSIVENESS DURING NEURONAL MIGRATION AND EARLY DIFFERENTIATION

被引:181
作者
KNUSEL, B
RABIN, SJ
HEFTI, F
KAPLAN, DR
机构
[1] UNIV SO CALIF,DEPT BIOL SCI,LOS ANGELES,CA 90089
[2] NCI,FREDERICK CANC RES & DEV CTR,ABL,BASIC RES PROGRAM,FREDERICK,MD 21702
关键词
NGF; BRAIN-DERIVED NEUROTROPHIC FACTOR; NEUROTROPHIN-3; NEUROTROPHIN-4/5; RECEPTOR TYROSINE KINASE; CHOLINERGIC BRAIN NEURONS; ERK; 1; PHOSPHOLIPASE C-GAMMA-1; SNT; ALZHEIMERS DISEASE;
D O I
10.1523/JNEUROSCI.14-03-01542.1994
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The response of brain tissue to neurotrophins during rat development was examined using a novel in vitro assay for Trk/neurotrophin receptor activity. In this assay, brain tissues were exposed to neurotrophins and ligand-induced Trk tyrosine phosphorylation was measured. During the perinatal period, Trk tyrosine phosphorylation in all brain areas was induced very similarly by the TrkB and TrkC ligands brain-derived neurotrophic factor (BDNF), neurotrophin-3 (NT-3), and neurotrophin-4/5 (NT-4/5). In the adult brain, minimal signals were observed after treatment with these three factors, despite the continued presence of full-length and truncated TrkB protein. In contrast, responsiveness to the TrkA ligand NGF was absent in the embryo and increased during the first 2 weeks after birth in various brain areas, particularly in striatum, basal forebrain, and hippocampus. Our results, showing maximal responsiveness of brain tissue to BDNF, NT-3, and NT-4/5 during early neuronal differentiation and migration, suggest involvement of TrkB in these events. The lack of a significant response to these neurotrophins in the adult brain indicates effective posttranslational mechanisms that control the response of Trk family receptors. Our findings further demonstrate that neurons of the striatum and basal forebrain remain NGF responsive in the adult, confirming at the molecular level results obtained earlier at the cellular level for the basal forebrain cholinergic neurons.
引用
收藏
页码:1542 / 1554
页数:13
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