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Valproic acid improves outcome after rodent spinal cord injury: potential roles of histone deacetylase inhibition.
Brain Research 2011 June 18
Histone deacetylases (HDAC) inhibitors including valproic acid (VPA) have emerged as a promising therapeutic intervention in neurological disorders. We investigated the levels of acetylated histone and the therapeutic potential of VPA in a rat model of spinal cord injury (SCI). At different time points (12 h, 1 day, 3 days, 1 week and 2 weeks) after SCI or sham surgery, the spinal cords were collected to evaluate the levels of acetylated histone H3 (Ac-H3) and H4 (Ac-H4). VPA or vehicle was injected for 1 week starting immediately after SCI and histone acetylation, apoptosis, as well as neurobehavior were observed to test the effect of VPA. The levels of Ac-H3 and Ac-H4 in the injured spinal cord started to significantly decrease as early as day 1, and remained below those in uninjured controls for at least 2 weeks after SCI. Injection of VPA markedly prevented the reductions of Ac-H3 and Ac-H4, upregulated the expressions of Hsp70 and Bcl-2, reduced apoptosis and finally promoted locomotion recovery. Our data demonstrated that SCI led to marked reduction in histone acetylation; VPA was neuroprotective in the SCI model, and the mechanism may involve HDAC inhibition and protective proteins induction.
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