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The Journal of Neuroscience, July 1, 2000, 20(13):5024-5036
Rapid Dendritic Remodeling in the Developing Retina: Dependence on Neurotransmission and Reciprocal Regulation by Rac and Rho
Wai T. Wong, Beverly E. Faulkner-Jones, Joshua R. Sanes, and Rachel O. L. Wong Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110
We demonstrate that within the intact and spontaneously active retina, dendritic processes of ganglion cells exhibit rapid and extensive movements during the period of synaptogenesis. Marked restructuring occurs in seconds, but structural changes are relatively balanced across the dendritic arbor, maintaining overall arbor size and complexity over hours. Dendritic motility is regulated by spontaneous glutamatergic transmission. Both the rate and extent of the movements are decreased by antagonists to NMDA and non-NMDA glutamate receptors but are unaffected by tetrodotoxin, a sodium channel blocker. The dendritic movements are actin dependent and are controlled by the Rho family of small GTPases. Transfection of dominant-negative and constitutively active mutants into ganglion cells showed that Rac and Rho exert reciprocal effects on motility. We suggest that the Rho family of small GTPases could integrate activity-dependent and -independent signals from afferents, thereby adjusting target motility and maximizing the chance for initial contact and subsequent synaptogenesis.
Key words: dendritic development; process motility; synaptogenesis; Rho; Rac; spontaneous activity; retinal ganglion cells
Copyright © 2000 Society for Neuroscience 0270-6474/00/20135024-13$05.00/0
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