Cancer Cell Dependence on Unsaturated Fatty Acids Implicates Stearoyl-CoA Desaturase as a Target for Cancer Therapy

被引:200
作者
Roongta, Urvashi V.
Pabalan, Jonathan G.
Wang, Xinyu
Ryseck, Rolf-Peter
Fargnoli, Joseph
Henley, Benjamin J.
Yang, Wen-Pin [2 ]
Zhu, Jun [2 ]
Madireddi, Malavi T. [3 ]
Lawrence, R. Michael [4 ]
Wong, Tai W.
Rupnow, Brent A. [1 ]
机构
[1] Bristol Myers Squibb R&D, Dept Oncol Drug Discovery, Oncol Drug Discovery, Princeton, NJ 08543 USA
[2] Bristol Myers Squibb R&D, Applied Biotechnol, Princeton, NJ 08543 USA
[3] Bristol Myers Squibb R&D, Metab Dis Drug Discovery, Princeton, NJ 08543 USA
[4] Bristol Myers Squibb R&D, Discovery Chem, Princeton, NJ 08543 USA
关键词
ENDOPLASMIC-RETICULUM STRESS; UNFOLDED PROTEIN RESPONSE; ER STRESS; GENE-EXPRESSION; APOPTOSIS; INHIBITION; PROLIFERATION; DISCOVERY; MEMBRANE; LIVER;
D O I
10.1158/1541-7786.MCR-11-0126
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Emerging literature suggests that metabolic pathways play an important role in the maintenance and progression of human cancers. In particular, recent studies have implicated lipid biosynthesis and desaturation as a requirement for tumor cell survival. In the studies reported here, we aimed to understand whether tumor cells require the activity of either human isoform of stearoyl-CoA-desaturase (SCD1 or SCD5) for survival. Inhibition of SCD1 by siRNA or a small molecule antagonist results in strong induction of apoptosis and growth inhibition, when tumor cells are cultured in reduced (2%) serum conditions, but has little impact on cells cultured in 10% serum. Depletion of SCD5 had minimal effects on cell growth or apoptosis. Consistent with the observed dependence on SCD1, but not SCD5, levels of SCD1 protein increased in response to decreasing serum levels. Both induction of SCD1 protein and sensitivity to growth inhibition by SCD1 inhibition could be reversed by supplementing growth media with unsaturated fatty acids, the product of the enzymatic reaction catalyzed by SCD1. Transcription profiling of cells treated with an SCD inhibitor revealed strong induction of markers of endoplasmic reticulum stress. Underscoring its importance in cancer, SCD1 protein was found to be highly expressed in a large percentage of human cancer specimens. SCD inhibition resulted in tumor growth delay in a human gastric cancer xenograft model. Altogether, these results suggest that desaturated fatty acids are required for tumor cell survival and that SCD may represent a viable target for the development of novel agents for cancer therapy. Mol Cancer Res; 9(11); 1551-61. (C) 2011 AACR.
引用
收藏
页码:1551 / 1561
页数:11
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