Abstract
The aim of this study was to investigate the possible effects of the Rho-kinase inhibitor, fasudil, on the lysophosphatidic acid (LPA)-induced neurite retraction in N1E-115 cells. In cultured N1E-115 cells, LPA produced a marked increase in the population of rounded cells. Fasudil or hydroxyfasudil, an active metabolite of fasudil, blocked cell rounding in a concentration-dependent manner at levels between 1 and 10 μM, with IC 50 values of 1.7 or 1.6 μM, respectively. Fasudil or hydroxyfasudil concentration-dependently inhibited phosphorylation of the myosin binding subunit of myosin phosphatase in N1E-115 cells. These results indicate that Rho-kinase is essential for LPA-induced neurite retraction in N1E-115 cells and that inactivation of Rho-kinase by a Rho-kinase inhibitor, such as fasudil, eliminates cell rounding and promotes neurite outgrowth, thus improving neurological function in the brain damage.
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