Ganglioside/protein kinase signals triggering cytoskeletal actin reorganization |
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Authors: | Higashi Hideyoshi Chen Nai Hong |
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Institution: | Mitsubishi Kagaku Institute of Life Sciences,11-Go Minamioya, Machida, Tokyo 194-8511, Japan. henry@libra.ls.m-kagaku.co.jp |
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Abstract: | Exposure of neuronal cells to nanomolar concentrations of oligosaccharide portions of ganglioside GM2 and GT1b stimulates cAMP-dependent protein kinase (PKA) Ca2+/calmodulin-dependent protein kinase II (CaMKII), respectively, in a few seconds suggesting the presence of glyco-receptor-like molecules on the surface of the cells. Both GM2/PKA (GalNAc/PKA) and GT1b/CaMKII signaling cascades induced cytoskeletal actin reorganization through Cdc42 activation leading to filopodia formation within 2 min. Long-term effects of these glyco-signals were facilitation of dendritic differentiation of primary cultured hippocampal neurons and cerebellar Purkinje neurons indicating physiological roles of the signals in neuronal differentiation and maturation. |
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