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The Journal of Neuroscience, February 15, 2003, 23(4):1416
Rho Kinase Inhibition Enhances Axonal Regeneration in the Injured CNS
Alyson E. Fournier, Bayan T. Takizawa, and Stephen M. Strittmatter Department of Neurology and Section of Neurobiology, Yale University School of Medicine, New Haven, Connecticut 06510
Myelin-associated inhibitors limit axonal regeneration in the injured brain and spinal cord. A common target of many neurite outgrowth inhibitors is the Rho family of small GTPases. Activation of Rho and a downstream effector of Rho, p160ROCK, inhibits neurite outgrowth. Here, we demonstrate that Rho is directly activated by the myelin-associated inhibitor Nogo-66. Using a binding assay to measure Rho activity, we detected increased levels of GTP Rho in PC12 and dorsal root ganglion (DRG) cell lysates after Nogo-66 stimulation. Rho activity levels were not affected by Amino-Nogo stimulation. Rho inactivation with C3 transferase promotes neurite outgrowth of chick DRG neurons in vitro, but with the delivery method used here, it fails to promote neurite outgrowth after corticospinal tract (CST) lesions in the adult rat. Inhibition of p160ROCK with Y-27632 also promotes neurite outgrowth on myelin-associated inhibitors in vitro. Furthermore, Y-27632 enhances sprouting of CST fibers in vivo and accelerates locomotor recovery after CST lesions in adult rats.
Key words: Nogo; myelin; axon inhibition; ROCK; Y-27632; C3; regeneration
Copyright © 2003 Society for Neuroscience 0270-6474/03/2341416-08$05.00/0
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