Pharmacodynamic Assessment of Histone Deacetylase Inhibitors: Infrared Vibrational Spectroscopic Imaging of Protein Acetylation

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• 作者：Tsoching Chen ; Min-Jung Lee ; Yeong Sang Kim ; Sunmin Lee ; Shivaani Kummar ; Martin Gutierrez ; Stephen M. Hewitt ; Jane B. Trepel ; Ira W. Levin
• 刊名：Analytical Chemistry
• 出版年：2008
• 出版时间：August 15, 2008
• 年：2008
• 卷：80
• 期：16
• 页码：6390-6396
• 全文大小：310K
• 年卷期：v.80,no.16(August 15, 2008)
• ISSN：1520-6882

文摘

Infrared spectroscopy identifies molecules by detection of vibrational patterns characteristic of molecular bonds. We apply this approach to measure protein acetylation after treatment with histone deacetylase inhibitors. The anticancer activity of histone deacetylase inhibitors (HDACi) is ascribed to the hyperacetylation of both core nucleosomal histones and nonhistone proteins critical to the maintenance of the malignant phenotype (Marks, P. A.; Richon, V. M.; Breslow, R.; Rifkind, R. A. Curr. Opin. Oncol. 2001, 13, 477−483; Mai, A.; Massa, S.; Rotili, D.; Cerbara, I.; Valente, S.; Pezzi, R.; Simeoni, S.; Ragno, R. Med. Res. Rev. 2005, 25, 261−309). After incubation of the peripheral blood mononuclear cells (PBMCs) in vitro with the HDACi SNDX-275, a benzamide drug derivative, vibrational spectral changes in the methyl and methylene stretching mode regions, which reflect concentration-dependent increases in protein acetylation, were detected and quantified. We applied these metrics, based upon spectral differences, to peripheral blood mononuclear cells from patients treated in vivo with this agent. The data demonstrate a new approach to a sensitive assessment of global molecular modifications that is independent of antibodies, requires minimal cell processing, and is easily adapted to high-throughput screening.