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The tight interaction between genomic DNA and histones, which normally represses gene transcription, can be relaxed by histone acetylation. This loosening of the DNA-histone complex is important for selective gene activation during stem cell differentiation. Histone acetylation may be increased through the application of histone deacetylase inhibitors at the early stages of differentiation to modulate lineage commitment. We examined the effects of the histone deacetylase inhibitor valproic acid on the differentiation of pluripotent stem cells into skeletal myocytes. Our data demonstrated that valproic acid can act in concert with retinoic acid to enhance the commitment of stem cells into the skeletal myocyte lineage reinforcing the notion that histone acetylation is important for skeletal myogenesis. Thus, using a combination of small molecules to exploit different signaling pathways pertaining to specific gene programs will allow for modulation of lineage specification and stem cell differentiation in potential cell-based therapies.

Effects of histone deacetylase inhibitor valproic acid on skeletal myocyte development