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Rho GTPases regulate distinct aspects of dendritic arbor growth in Xenopus central neurons in vivo

Nature Neurosciencevolume 3pages217225 (2000) | Download Citation

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Abstract

The development and structural plasticity of dendritic arbors are governed by several factors, including synaptic activity, neurotrophins and other growth-regulating molecules. The signal transduction pathways leading to dendritic structural changes are unknown, but likely include cytoskeleton regulatory components. To test whether GTPases regulate dendritic arbor development, we collected time-lapse images of single optic tectal neurons in albino Xenopus tadpoles expressing dominant negative or constitutively active forms of Rac, Cdc42 or RhoA. Analysis of images collected at two-hour intervals over eight hours indicated that enhanced Rac activity selectively increased branch additions and retractions, as did Cdc42 to a lesser extent. Activation of endogenous RhoA decreased branch extension without affecting branch additions and retractions, whereas dominant-negative RhoA increased branch extension. Finally, we provide data suggesting that RhoA mediates the promotion of normal dendritic arbor development by NMDA receptor activation.

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Acknowledgements

We thank Wun Chey Sin for providing the EGFP-Cdc42N17 and EGFP-RhoN19 viruses, Kim Bronson for technical assistance and Neil Mahapatra for help with the Sholl analysis. Support for the work was provided by the NIH (H.T.C., L.V.A.) and the Eppley Foundation (H.T.C.).

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Affiliations

  1. Cold Spring Harbor Laboratory, Beckman Bldg., 1 Bungtown Rd., Cold Spring Harbor, 11724, New York, USA

    • Zheng Li
    • , Linda Van Aelst
    •  & Hollis T. Cline
  2. Department of Neurobiology and Behavior, SUNY Stony Brook, New York, 11794, USA

    • Zheng Li
    •  & Hollis T. Cline

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Correspondence to Hollis T. Cline.

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https://doi.org/10.1038/72920

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