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DNAJB6 chaperones PP2A mediated dephosphorylation of GSK3β to downregulate β-catenin transcription target, osteopontin

Oncogene volume 31, pages 4472–4483 (2012)Cite this article

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Abstract

Elevated levels of the oncoprotein, osteopontin (OPN), are associated with poor outcome of several types of cancers including melanoma. We have previously reported an important involvement of DNAJB6, a member of heat-shock protein 40 (HSP40) family, in negatively impacting tumor growth. The current study was prompted by our observations reported here which revealed a reciprocal relationship between DNAJB6 and OPN in melanoma specimens. The ‘J domain’ is the most conserved domain of HSP40 family of proteins. Hence, we assessed the functional role of the J domain in activities of DNAJB6. We report that the J domain of DNAJB6 is involved in mediating OPN suppression. Deletion of the J domain renders DNAJB6 incapable of impeding malignancy and suppressing OPN. Our mechanistic investigations reveal that DNAJB6 binds HSPA8 (heat-shock cognate protein, HSC70) and causes dephosphorylation of glycogen synthase kinase 3β (GSK3β) at Ser 9 by recruiting protein phosphatase, PP2A. This dephosphorylation activates GSK3β, leading to degradation of β-catenin and subsequent loss of TCF/LEF (T cell factor1/lymphoid enhancer factor1) activity. Deletion of the J domain abrogates assembly of this multiprotein complex and renders GSK3β inactive, thus, stabilizing β-catenin, a transcription co-activator for OPN expression. Our in-vitro and in-vivo functional analyses show that silencing OPN expression in the background of deletion of the J domain renders the resultant tumor cells less malignant despite the presence of stabilized β-catenin. Thus, we have uncovered a new mechanism for regulation of GSK3β activity leading to inhibition of Wnt/β-catenin signaling.

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Acknowledgements

This study was supported by USPHS grants CA140472 (RSS) and CA138850 (LAS). RSS is the recipient of the Mayer Mitchell Award for Excellence in Cancer Research and acknowledges the support. We thank Dr Randall Moon (HHMI University of Washington) for providing the TOPFlash reporter.

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  1. Department of Oncologic Sciences, Mitchell Cancer Institute, University of South Alabama, Mobile, AL, USA

    A Mitra, M E Menezes, L K Pannell, L A Shevde & R S Samant

  2. Department of Mathematics and Statistics, University of South Alabama, Mobile, AL, USA

    M S Mulekar

  3. Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, AL, USA

    R E Honkanen

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  1. A Mitra
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Mitra, A., Menezes, M., Pannell, L. et al. DNAJB6 chaperones PP2A mediated dephosphorylation of GSK3β to downregulate β-catenin transcription target, osteopontin. Oncogene 31, 4472–4483 (2012). https://doi.org/10.1038/onc.2011.623

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