CYLD inhibits melanoma growth and progression through suppression of the JNK/AP-1 and β1-integrin signaling pathways.

Published

Journal Article

The molecular mechanisms mediating cylindromatosis (CYLD) tumor suppressor function appear to be manifold. Here, we demonstrate that, in contrast to the increased levels of phosphorylated c-Jun NH(2)-terminal kinase (pJNK), CYLD was decreased in a majority of the melanoma cell lines and tissues examined. Exogenous expression of CYLD but not its catalytically deficient mutant markedly inhibited melanoma cell proliferation and migration in vitro and subcutaneous tumor growth in vivo. In addition, the melanoma cells expressing exogenous CYLD were unable to form pulmonary tumor nodules following tail-vein injection. At the molecular level, CYLD decreased β1-integrin and inhibited pJNK induction by tumor necrosis factor-α or cell attachment to collagen IV. Moreover, CYLD induced an array of other molecular changes associated with modulation of the "malignant" phenotype, including a decreased expression of cyclin D1, N-cadherin, and nuclear Bcl3, and an increased expression of p53 and E-cadherin. Most interestingly, coexpression of the constitutively active MKK7 or c-Jun mutants with CYLD prevented the above molecular changes, and fully restored melanoma growth and metastatic potential in vivo. Our findings demonstrate that the JNK/activator protein 1 signaling pathway underlies the melanoma growth and metastasis that are associated with CYLD loss of function. Thus, restoration of CYLD and inhibition of JNK and β1-integrin function represent potential therapeutic strategies for treatment of malignant melanoma.

Full Text

Duke Authors

Cited Authors

  • Ke, H; Augustine, CK; Gandham, VD; Jin, JY; Tyler, DS; Akiyama, SK; Hall, RP; Zhang, JY

Published Date

  • January 2013

Published In

Volume / Issue

  • 133 / 1

Start / End Page

  • 221 - 229

PubMed ID

  • 22832488

Pubmed Central ID

  • 22832488

Electronic International Standard Serial Number (EISSN)

  • 1523-1747

Digital Object Identifier (DOI)

  • 10.1038/jid.2012.253

Language

  • eng

Conference Location

  • United States