Neurite outgrowth by the alternatively spliced region of human tenascin-C is mediated by neuronal α7β1 integrin

被引:72
|
作者
Mercado, MLT [1 ]
Nur-e-Kamal, A [1 ]
Liu, HY [1 ]
Gross, SR [1 ]
Movahed, R [1 ]
Meiners, S [1 ]
机构
[1] Univ Med & Dent New Jersey, Robert Wood Johnson Med Sch, Dept Pharmacol, Piscataway, NJ 08854 USA
来源
JOURNAL OF NEUROSCIENCE | 2004年 / 24卷 / 01期
关键词
tenascin-C; FN-III repeat; alternatively spliced region; synthetic peptide; site-directed modifications; neurite outgrowth; alpha; 7; beta; 1; integrin;
D O I
10.1523/JNEUROSCI.4519-03.2004
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The region of tenascin-C containing only alternately spliced fibronectin type-III repeat D (fnD) increases neurite outgrowth by itself and also as part of tenascin-C. We previously localized the active site within fnD to an eight amino acid sequence unique to tenascin-C, VFDNFVLK, and showed that the amino acids FD and FV are required for activity. The purpose of this study was to identify the neuronal receptor that interacts with VFDNFVLK and to investigate the hypothesis that FD and FV are important for receptor binding. Function-blocking antibodies against both alpha7 and beta1 integrin subunits were found to abolish VFDNFVLK-mediated process extension from cerebellar granule neurons. VFDNFVLK but not its mutant, VSPNGSLK, induced clustering of neuronal beta1 integrin immunoreactivity. This strongly implicates FD and FV as important structural elements for receptor activation. Moreover, biochemical experiments revealed an association of the alpha7beta1 integrin with tenascin-C peptides containing the VFDNFVLK sequence but not with peptides with alterations in FD and/or FV. These findings are the first to provide evidence that the alpha7beta1 integrin mediates a response to tenascin-C and the first to demonstrate a functional role for the alpha7beta1 integrin receptor in CNS neurons.
引用
收藏
页码:238 / 247
页数:10
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