Journal
CANCER RESEARCH
Volume 73, Issue 15, Pages 4770-4780Publisher
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-13-0384
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Funding
- NIH [R01 DK060684, R25-CA148052]
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [0844801] Funding Source: National Science Foundation
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The fatty acid-binding protein FABP5 shuttles ligands from the cytosol to the nuclear receptor PPAR beta/delta (encoded for by Ppar delta), thereby enhancing the transcriptional activity of the receptor. This FABP5/PPAR delta pathway is critical for induction of proliferation of breast carcinoma cells by activated epidermal growth factor receptor (EGFR). In this study, we show that FABP5 is highly upregulated in human breast cancers and we provide genetic evidence of the pathophysiologic significance of FABP5 in mammary tumorigenesis. Ectopic expression of FABP5 was found to be oncogenic in 3T3 fibroblasts where it augmented the ability of PPAR delta to enhance cell proliferation, migration, and invasion. To determine whether FABP5 is essential for EGFR-induced mammary tumor growth, we interbred FABP5-null mice with MMTV-ErbB2/HER2 oncomice, which spontaneously develop mammary tumors. FABP5 ablation relieved activation of EGFR downstream effector signals, decreased expression of PPAR delta target genes that drive cell proliferation, and suppressed mammary tumor development. Our findings establish that FABP5 is critical for mammary tumor development, rationalizing the development of FABP5 inhibitors as novel anticarcinogenic drugs. (C)2013 AACR.
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