A human IgM signals axon outgrowth: coupling lipid raft to microtubules
| Autor: | Xiaohua, Xu, Arthur E, Warrington, Brent R, Wright, Allan J, Bieber, Virginia, Van Keulen, Larry R, Pease, Moses, Rodriguez |
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| Rok vydání: | 2011 |
| Předmět: |
Neurogenesis
Caveolin 1 G(M1) Ganglioside Hippocampus Immunohistochemistry Microtubules Axons Recombinant Proteins Article Mice Cholesterol Membrane Microdomains nervous system Immunoglobulin M Tubulin Centrifugation Density Gradient Animals Humans Immunoprecipitation Tyrosine lipids (amino acids peptides and proteins) Cells Cultured Signal Transduction |
| Zdroj: | Journal of neurochemistry. 119(1) |
| ISSN: | 1471-4159 |
| Popis: | Mouse and human IgMs support neurite extension from primary cerebellar granule neurons. In this study using primary hippocampal and cortical neurons, we demonstrate that a recombinant human IgM, rHIgM12, promotes axon outgrowth by coupling membrane domains (lipid rafts) to microtubules. rHIgM12 binds to the surface of neuron and induces clustering of cholesterol and ganglioside GM1. After cell binding and membrane fractionation, rHIgM12 gets segregated into two pools, one associated with lipid raft fractions and the other with the detergent-insoluble cytoskeleton-containing pellet. Membrane-bound rHIgM12 co-localized with microtubules and co-immuno precipitated with β3-tubulin. rHIgM12-membrane interaction also enhanced the tyrosination of α-tubulin indicating a stabilization of new neurites. When presented as a substrate, rHIgM12 induced axon outgrowth from primary neurons. We now demonstrate that a recombinant human mAb can induce signals in neurons that regulate membrane lipids and microtubule dynamics required for axon extension. We propose that the pentameric structure of the IgM is critical to cross-link membrane lipids and proteins resulting in signaling cascades. |
| Databáze: | OpenAIRE |
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