Class II-specific histone deacetylase inhibitors MC1568 and MC1575 suppress IL-8 expression in human melanoma cells

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Here, we explored the effects of the novel class II-specific histone deacetylase inhibitors (HDACis) MC1568 and MC1575 on interleukin-8 (IL-8) expression and cell proliferation in cutaneous melanoma cell line GR-M and uveal melanoma cell line OCM-3 upon stimulation with phorbol 12-myristate 13-acetate (PMA). We found that PMA upregulatedIL-8transcription via the AP-1 binding site and identified c-Jun as the transcription factor involved in this eventS. MC1568 and MC1575 inhibited IL-8 levels and cell proliferation in either unstimulated or PMA-stimulated melanoma cells. They acted by suppressing (i) c-Jun binding to theIL-8promoter, (ii) recruitment of histones 3 and 4, RNA polymerase II and TFIIB to thec-Junpromoter, and (iii)c-Junexpression. Our findings provide new insights into mechanisms underlying anti-tumoral activities of class II-specific HDACis in human melanoma and suggest that they may constitute a novel therapeutic strategy for improving the treatment of this cancer.

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