Inhibition of histone deacetylases (HDACs) has been implicated to modulate transcription and to induce apoptosis or differentiation in cancer cells. The HDAC Fluorometric and Colorimetric Assay Kits provide simple procedures for fast and convenient measurement of HDAC activity by fluorometric and colorimetric methods. The methods eliminate radioactivity, extractions, or chromatography, as used in the traditional assays. The new procedures require only two easy steps, both performed on the same microtiter plate. First, the HDAC fluorometric (or colorimetric) substrate, which comprises an acetylated lysine side chain, is incubated with a sample containing HDAC activity (e.g., HeLa nuclear extract). Deacetylation sensitizes the substrate, and thus in the second step, treatment with the Lysine Developer produces a fluorophore (or chromophore), which can be analyzed using a fluorometric (or colorimetric) plate reader. The HDAC Inhibitor Drug Screening Kit provides sufficient positive controls for screening 100 samples of HDAC inhibitor candidates in drug discovery. HDAC inhibitors and antibodies are also available separately.
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