Melanoma Development and Progression Are Associated with Rad6 Upregulation and β-Catenin Relocation to the Cell Membrane. (6th May 2014)

• Record Type: Journal Article
• Authors: Rosner, Karli; Mehregan, Darius R.; Kirou, Evangelia; Abrams, Judith; Kim, Seongho; Campbell, Michelle; Frieder, Jillian; Lawrence, Kelsey; Haynes, Brittany; Shekhar, Malathy P. V.
• Other Names: Ugurel Selma Academic Editor.
• Is Part Of: Journal of skin cancer. Volume 2014(2014)
• Publication Date: 2014-05-06
• Subjects: Skin -- Cancer -- Periodicals; Skin -- Cancer -- Diagnosis -- Periodicals; Skin -- Cancer -- Prevention -- Periodicals; Skin -- Cancer -- Treatment -- Periodicals; 616.99477005
• DOI: 10.1155/2014/439205
• Languages: English
• ISSNs: 2090-2905

Abstract

Abstract : We have previously demonstrated that Rad6 and β -catenin enhance each other's expression through a positive feedback loop to promote breast cancer development/progression. While β -catenin has been implicated in melanoma pathogenesis, Rad6 function has not been investigated. Here, we examined the relationship between Rad6 and β -catenin in melanoma development and progression. Eighty-eight cutaneous tumors, 30 nevi, 29 primary melanoma, and 29 metastatic melanomas, were immunostained with anti- β -catenin and anti-Rad6 antibodies. Strong expression of Rad6 was observed in only 27% of nevi as compared to 100% of primary and 96% of metastatic melanomas. β -Catenin was strongly expressed in 97% of primary and 93% of metastatic melanomas, and unlike Rad6, in 93% of nevi. None of the tumors expressed nuclear β -catenin. β -Catenin was exclusively localized on the cell membrane of 55% of primary, 62% of metastatic melanomas, and only 10% of nevi. Cytoplasmic β -catenin was detected in 90% of nevi, 17% of primary, and 8% of metastatic melanoma, whereas 28% of primary and 30% of metastatic melanomas exhibited β -catenin at both locations. These data suggest that melanoma development and progression are associated with Rad6 upregulation and membranous redistribution of β -catenin and that β -catenin and Rad6 play independent roles in melanoma development.