HIF1α and HIF2α independently activate SRC to promote melanoma metastases
Sara C. Hanna, … , Kwok-Kin Wong, William Y. Kim
Sara C. Hanna, … , Kwok-Kin Wong, William Y. Kim
Published April 8, 2013
Citation Information: J Clin Invest. 2013;123(5):2078-2093. https://doi.org/10.1172/JCI66715.
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Research Article Oncology

HIF1α and HIF2α independently activate SRC to promote melanoma metastases

Abstract

Malignant melanoma is characterized by a propensity for early lymphatic and hematogenous spread. The hypoxia-inducible factor (HIF) family of transcription factors is upregulated in melanoma by key oncogenic drivers. HIFs promote the activation of genes involved in cancer initiation, progression, and metastases. Hypoxia has been shown to enhance the invasiveness and metastatic potential of tumor cells by regulating the genes involved in the breakdown of the ECM as well as genes that control motility and adhesion of tumor cells. Using a Pten-deficient, Braf-mutant genetically engineered mouse model of melanoma, we demonstrated that inactivation of HIF1α or HIF2α abrogates metastasis without affecting primary tumor formation. HIF1α and HIF2α drive melanoma invasion and invadopodia formation through PDGFRα and focal adhesion kinase–mediated (FAK-mediated) activation of SRC and by coordinating ECM degradation via MT1-MMP and MMP2 expression. These results establish the importance of HIFs in melanoma progression and demonstrate that HIF1α and HIF2α activate independent transcriptional programs that promote metastasis by coordinately regulating cell invasion and ECM remodeling.

Authors

Sara C. Hanna, Bhavani Krishnan, Sean T. Bailey, Stergios J. Moschos, Pei-Fen Kuan, Takeshi Shimamura, Lukas D. Osborne, Marni B. Siegel, Lyn M. Duncan, E. Tim O’Brien III, Richard Superfine, C. Ryan Miller, M. Celeste Simon, Kwok-Kin Wong, William Y. Kim

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Figure 6

HIF1α and HIF2α-dependent invasion require PDGFRα and FAK, respectively.

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HIF1α and HIF2α-dependent invasion require PDGFRα and FAK, respectively....
(A) A375 SM and WM2664 cells stably expressing EGFP, HIF1dPA, or HIF2dPA were transfected with siRNAs against PDGFRα and FAK. Whole-cell extracts were immunoblotted with the indicated antibodies. (B) Representative photomicrographs of A375 SM and WM2664 cells stably expressing EGFP, HIF1dPA, or HIF2dPA and transfected with indicated siRNA oligos, which have invaded through Matrigel chambers. Original magnification, ×10 magnification. (C) Quantification of A375 SM cells stably expressing EGFP, HIF1dPA, or HIF2dPA and transfected with siRNA oligos against either PDGFRα or FAK, which have invaded through Matrigel chambers. (D) Quantification of WM2664 cells stably expressing EGFP, HIF1dPA, or HIF2dPA and transfected with siRNA oligos against either PDGFRα or FAK, which have invaded through Matrigel chambers. Error bars show SEM. ***P < 0.0005; **P < 0.005.