A critical role for a Rho-associated kinase, p160ROCK, in determining axon outgrowth in mammalian CNS neurons

Haruhiko Bito, Tomoyuki Furuyashiki, Hisamitsu Ishihara, Yoshikazu Shibasaki, Kazumasa Ohashi, Kensaku Mizuno, Midori Maekawa, Toshimasa Ishizaki, Shuh Narumiya

Research output: Contribution to journalArticlepeer-review

253 Citations (Scopus)

Abstract

We tested the contribution of the small GTPase Rho and its downstream target p160ROCK during the early stages of axon formation in cultured cerebellar granule neurons. p160ROCK inhibition, presumably by reducing the stability of the cortical actin network, triggered immediate outgrowth of membrane ruffles and filopodia, followed by the generation of initial growth cone-like membrane domains from which axonal processes arose. Furthermore, a potentiation in both the size and the motility of growth cones was evident, though the overall axon elongation rate remained stable. Conversely, overexpression of dominant active forms of Rho or ROCK was suggested to prevent initiation of axon outgrowth. Taken together, our data indicate a novel role for the Rho/ROCK pathway as a gate critical for the initiation of axon outgrowth and the control of growth cone dynamics.

Original languageEnglish
Pages (from-to)431-441
Number of pages11
JournalNeuron
Volume26
Issue number2
DOIs
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Neuroscience(all)

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