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Am. J. Respir. Crit. Care Med. · Sep 2014
Squalene Synthase Induces TNFR1 Enrichment in Lipid Rafts to Promote Lung Cancer Metastasis.
- Yi-Fang Yang, Yi-Hua Jan, Yu-Peng Liu, Chih-Jen Yang, Chia-Yi Su, Yu-Chan Chang, Tsung-Ching Lai, Jean Chiou, Hong-Yuan Tsai, Jean Lu, Chia-Ning Shen, Jin-Yuh Shew, Pei-Jung Lu, Yuan-Feng Lin, Ming-Shyan Huang, and Michael Hsiao.
- 1 Institute of Biochemistry and Molecular Biology, National Yang-Ming University, Taipei, Taiwan.
- Am. J. Respir. Crit. Care Med.. 2014 Sep 15;190(6):675-87.
RationaleMetabolic alterations contribute to cancer development and progression. However, the molecular mechanisms relating metabolism to cancer metastasis remain largely unknown.ObjectivesTo identify a key metabolic enzyme that is aberrantly overexpressed in invasive lung cancer cells and to investigate its functional role and prognostic value in lung cancer.MethodsThe differential expression of metabolic enzymes in noninvasive CL1-0 cells and invasive CL1-5 cells was analyzed by a gene expression microarray. The expression of target genes in clinical specimens from patients with lung cancer was examined by immunohistochemistry. Pharmacologic and gene knockdown/overexpression approaches were used to investigate the function of the target gene during invasion and metastasis in vitro and in vivo. The association between the target gene expression and clinicopathologic parameters was further analyzed. Bioinformatic analyses were used to discover the signaling pathways involved in target gene-regulated invasion and migration.Measurements And Main ResultsSqualene synthase (SQS) was up-regulated in CL1-5 cells and in the tumor regions of the lung cancer specimens. Loss of function or knockdown of SQS significantly inhibited invasion/migration and metastasis in cell and animal models and vice versa. High expression of SQS was significantly associated with poor prognosis among patients with lung cancer. Mechanistically, SQS contributed to a lipid-raft-localized enrichment of tumor necrosis factor receptor 1 in a cholesterol-dependent manner, which resulted in the enhancement of nuclear factor-κB activation leading to matrix metallopeptidase 1 up-regulation.ConclusionsUp-regulation of SQS promotes metastasis of lung cancer by enhancing tumor necrosis factor-α receptor 1 and nuclear factor-κB activation and matrix metallopeptidase 1 expression. Targeting SQS may have considerable potential as a novel therapeutic strategy to treat metastatic lung cancer.
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