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Clinical Cancer Research Vol. 12, 3028-3036, May 15, 2006
© 2006 American Association for Cancer Research

Human Cancer Biology

Peroxisome Proliferator–Activated Receptor {alpha} Activation Decreases Metastatic Potential of Melanoma Cells In vitro via Down-Regulation of Akt

Maja Grabacka1,2, Przemyslaw M. Plonka2, Krystyna Urbanska2 and Krzysztof Reiss1

Authors' Affiliations: 1 Center for Neurovirology, Department of Neuroscience, School of Medicine, Temple University, Philadelphia, Pennsylvania and 2 Department of Biophysics, Faculty of Biotechnology, Jagiellonian University, Krakow, Poland

Requests for reprints: Krzysztof Reiss, Center for Neurovirology, Department of Neuroscience, School of Medicine, Temple University, BLSB #238, 1900 North 12th Street, Philadelphia, PA 19122. Phone: 215-204-6345; Fax: 215-204-0679; E-mail: kreiss{at}temple.edu.

Purpose: Peroxisome proliferator-activated receptors (PPAR) regulate lipid and glucose metabolism but their anticancer properties have been recently studied as well. We previously reported the antimetastatic activity of the PPAR{alpha} ligand, fenofibrate, against melanoma tumors in vivo. Here we investigated possible molecular mechanisms of fenofibrate anti metastatic action.

Experimental Design: Monolayer cultures of mouse (B16F10) and human (SkMell88) melanoma cell lines, soft agar assay, and cell migration assay were used in this study. In addition, we analyzed PPAR{alpha} expression and its transcriptional activity in response to fenotibrate by using Western blots and liciferase-based reporter system.

Results: Fenofibrate inhibited migration of B16F10 and SkMel188 cells in Transwell chambers and colony formation in soft agar. These effects were reversed by PPAR inhibitor, GW9662. Western blot analysis revealed time-dependent down-regulation of Akt and extracellular signal–regulated kinase l/2 phosphorylation in fenofibrate-treated cells. A B16F10 cell line stably expressing constitutively active Akt mutant was resistant to fenofibrate. In contrast, Akt gene silencing with siRNA mimicked the fenofibrate action and reduced the migratory ability of B16F1O cells. In addition, fenofibrate strongly sensitized BI6FIO cells to the proapoptotic drug staurosporine, further supporting the possibility that fenofibrate-induced down-regulation of Akt function contributes to fenofibrate-mediated inhibition of metastatic potential in this experimental model.

Conclusions: Our results show that the PPAR-dependent antimetastatic activity of fenofibrate involves down-regulation of Akt phosphorylation and suggest that supplementation with this drug may improve the effectiveness of melanoma chemotherapy.




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Copyright © 2006 by the American Association for Cancer Research.