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α‐amino‐3‐hydroxy‐5‐methyl‐4‐isoxazolepropionic acid receptors signaling complexes in Bergmann glia
Author(s) -
Millán Alejandro,
AriasMontaño José Antonio,
Méndez J. Alfredo,
HernándezKelly L. Clara R.,
Ortega Arturo
Publication year - 2004
Publication title -
journal of neuroscience research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.72
H-Index - 160
eISSN - 1097-4547
pISSN - 0360-4012
DOI - 10.1002/jnr.20237
Subject(s) - ampa receptor , microbiology and biotechnology , long term depression , glutamate receptor , receptor , biology , chemistry , neuroscience , biochemistry
Glutamate, the major excitatory neurotransmitter, induces a wide array of signals from the membrane to the nucleus regulating gene expression. In Bergmann glia, Ca 2+ ‐permeable α‐amino‐3‐hydroxy‐5‐methyl‐4‐isoxazole‐ propionic acid (AMPA) receptors are involved in the short‐ and long‐term interactions between these cells and the neurons that they surround. After activation, AMPA receptors become tyrosine phosphorylated and by these means form multiprotein signaling complexes. To characterize these events, cultured chick Bergmann glia cells as well as chick cerebellar slices were exposed to glutamate, and, by using a combination of immunoprecipitation assays coupled to Western blot analysis, we identified several signaling proteins that become associated with these receptors. A dose‐ and time‐dependent association among AMPA receptors, the focal adhesion kinase pp125 FAK , the phosphatidylinositol‐3 kinase and paxillin was found. These results extend the concept of the transducisome to AMPA receptors and provide a framework in which a plausible control of the cytoskeletal network by glutamate is taking place, most possibly through AMPA receptors. © 2004 Wiley‐Liss, Inc.