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Integrin β1 is involved in the signaling of glial cell line-derived neurotrophic factor

✍ Scribed by Jun-Ping Cao; Jing-Kao Yu; Chong Li; Yu Sun; Hong-Hua Yuan; Hong-Jun Wang; Dian-Shuai Gao

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
452 KB
Volume
509
Category
Article
ISSN
0021-9967

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✦ Synopsis

Abstract

Glial cell line‐derived neurotrophic factor (GDNF) is a potent neurotrophic factor for the substantia nigra (SN) dopamine (DA) neurons. The transmembrane signaling of GDNF is mediated by a unique receptor system, including the ligand binding receptor GDNF family receptor α (GFRα) and the transmembrane signaling receptor Ret or neural cell adhesion molecule‐140 (NCAM‐140). Here, we found that another transmembrane cell adhesion molecule, integrin, a heterodimer consisting of α and β subunits, also mediates the transmembrane signaling of GDNF. The results showed that the level of phosphorylated Src homology 2 domain containing (Shc), which was associated with the cytoplasmic domain of integrin β1, increased after GDNF administration. Coimmunoprecipitation analysis demonstrated that integrin β1 could form a complex with GFRαl. The simulation of molecular modeling showed that four H‐bonds were formed between integrin β1 and GFRα. These data indicate that integrin β1 is involved in the transmembrane signaling of GDNF and suggest that integrin β1 may be an alternative signaling receptor for GDNF. J. Comp. Neurol. 509:203–210, 2008. © 2008 Wiley‐Liss, Inc.

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