Local translation and RhoA activity are required for the axon growth-inhibiting effects of CSPGs. A, Axonal application of cycloheximide (CHX) or anisomycin.

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Local translation and RhoA activity are required for the axon growth-inhibiting effects of CSPGs. A, Axonal application of cycloheximide (CHX) or anisomycin (ANI) blocks CSPG-mediated inhibition of axon growth. Local translation and RhoA activity are required for the axon growth-inhibiting effects of CSPGs. A, Axonal application of cycloheximide (CHX) or anisomycin (ANI) blocks CSPG-mediated inhibition of axon growth. Shown are phase contrast images of axons at t = 0 h (terminals are indicated by white arrowheads) and t = 3 h (terminals are indicated by black arrowheads). Scale bar, 50 μm. B, Quantification of the results in A. Axons grow significantly slower in media containing CSPG than vehicle. Coapplication of cycloheximide or anisomycin with CSPG blocked CSPG-mediated growth inhibition. C, Selective application of cycloheximide blocks the inhibition of axon growth by substrate-bound CSPG. This effect is similar to bath application of CSPG in A and B. D, Axon-specific inhibition of ROCK prevents the inhibition of axon growth rate by CSPGs or MAG-Fc. Shown are phase contrast images of axon terminals at t = 0 h (white arrowheads) and t = 3 h (black arrowheads). Scale bar, 50 μm. E, Quantification of the results in D. Axons grow significantly slower in media containing either CSPG or MAG-Fc versus vehicle. Coapplication of Y-27632, but not vehicle, blocked CSPG- and MAG-mediated axon growth inhibition. *p < 0.05, compared with control group as indicated (B, C, and E), ANOVA with Bonferroni posttest. Data are mean ± SEM. Breset A. Walker et al. J. Neurosci. 2012;32:14442-14447a ©2012 by Society for Neuroscience