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Induction of filopodia-like protrusions by transmembrane agrin: role of agrin glycosaminoglycan chains and Rho-family GTPases


, : Induction of filopodia-like protrusions by transmembrane agrin: role of agrin glycosaminoglycan chains and Rho-family GTPases. Experimental Cell Research 316(14): 2260-2277

Filopodia sense the extracellular environment and direct movement in many cell types, including neurons. Recent reports suggest that the transmembrane form of the widely expressed proteoglycan agrin (TM-agrin) regulates formation and stability of neuronal filopodia. In order to elucidate the mechanism by which TM-agrin regulates filopodia, we investigated the role of agrin's glycosaminoglycan (GAG) chains in the induction of filopodia formation by TM-agrin over-expression in hippocampal neurons, and in the induction of filopodia-like processes in COS7 cells. Deletion of the GAG chains of TM-agrin sharply reduced formation of filopodia-like branched retraction fibers (BRFs) in COS7 cells, with deletion of the heparan sulfate GAG chains being most effective, and eliminated filopodia induction in hippocampal neurons. GAG chain deletion also reduced the activation of Cdc42 and Rac1 resulting from TM-agrin over-expression. Moreover, dominant-negative Cdc42 and Rac1 inhibited BRF formation. Lastly, over-expression of TM-agrin increased the adhesiveness of COS7 cells and this increase was reduced by deletion of the GAG chains. Our results suggest that TM-agrin regulates actin-based protrusions in large part through interaction of its GAG chains with extracellular or transmembrane proteins, leading to the activation of Cdc42 and Rac1.

US$19.90

PMID: 20471381

DOI: 10.1016/j.yexcr.2010.05.006


Other references

Shainberg, D., 1971: Neuropsychologic guides to psychoanalytic techniques. American Journal of PsychoTherapy 25(3): 458-468

Bednarczyk, M.; Muc-Wierzgoń, Młgorzata.; Walkiewicz, K.; Kokot, T.; Fatyga, E.; Mazurek, U., 2017: Profile of gene expression of TLR-signaling pathways in colorectal cancer tissues. Toll-like receptors (TLRs) are involved in transduction of molecular signals in immune process such as induction and regulation of immunity, production of cytokines, and recognition of specific molecular patterns on the surface of microorganisms,...

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Rikitake T.; Whitham K., 1964: Interpretation of the Alert anomaly in geomagnetic variations. Canadian Journal of Earth Sciences = Journal Canadien des Sciences de la Terre 1(1): 35-62

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Holman J.M.Jr; Saba T.M., 1986: Leukocyte mediated hepatocyte injury. Journal of Leukocyte Biology 40(3): 255

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