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The Journal of Neuroscience, September 1, 1999, 19(17):7537-7547
Inactivation of Rho Signaling Pathway Promotes CNS Axon
Regeneration
Maxine
Lehmann1,
Alyson
Fournier1,
Immaculada
Selles-Navarro1,
Pauline
Dergham1,
Agnes
Sebok2,
Nicole
Leclerc1,
Gabor
Tigyi2, and
Lisa
McKerracher1
1 Département de Pathologie et Biologie
Cellulaire, Université de Montréal, Succursale Centreville,
Montréal, Québec H3C 3J7, Canada, and
2 Department of Physiology, University of Tennessee,
Memphis, Tennessee 38163
Regeneration in the CNS is blocked by many different growth
inhibitory proteins. To foster regeneration, we have investigated a
strategy to block the neuronal response to growth inhibitory signals.
Here, we report that injured axons regrow directly on complex
inhibitory substrates when Rho GTPase is inactivated. Treatment of PC12
cells with C3 enzyme to inactivate Rho and transfection with dominant
negative Rho allowed neurite growth on inhibitory substrates. Primary
retinal neurons treated with C3 extended neurites on myelin-associated
glycoprotein and myelin substrates. To explore regeneration in
vivo, we crushed optic nerves of adult rat. After C3 treatment,
numerous cut axons traversed the lesion to regrow in the distal white
matter of the optic nerve. These results indicate that targeting
signaling mechanisms converging to Rho stimulates axon regeneration on
inhibitory CNS substrates.
Key words:
retinal ganglion cells; optic nerve; Rho GTPase; microcrush lesion; C3 toxin; myelin-associated growth inhibitory
proteins; MAG
Copyright © 1999 Society for Neuroscience 0270-6474/99/19177537-11$05.00/0
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Y. Yamaguchi, H. Katoh, H. Yasui, K. Mori, and M. Negishi
RhoA Inhibits the Nerve Growth Factor-induced Rac1 Activation through Rho-associated Kinase-dependent Pathway
J. Biol. Chem.,
May 25, 2001;
276(22):
18977 - 18983.
[Abstract]
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M. Vinson, P. J. L. M. Strijbos, A. Rowles, L. Facci, S. E. Moore, D. L. Simmons, and F. S. Walsh
Myelin-associated Glycoprotein Interacts with Ganglioside GT1b. A MECHANISM FOR NEURITE OUTGROWTH INHIBITION
J. Biol. Chem.,
June 1, 2001;
276(23):
20280 - 20285.
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