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BAP1 deficiency causes loss of melanocytic cell identity in uveal melanoma.


ABSTRACT: BACKGROUND:Uveal melanoma is a highly aggressive cancer with a strong propensity for metastasis, yet little is known about the biological mechanisms underlying this metastatic potential. We recently showed that most metastasizing uveal melanomas, which exhibit a class 2 gene expression profile, contain inactivating mutations in the tumor suppressor BAP1. The aim of this study was to investigate the role of BAP1 in uveal melanoma progression. METHODS:Uveal melanoma cells were studied following RNAi-mediated depletion of BAP1 using proliferation, BrdU incorporation, flow cytometry, migration, invasion, differentiation and clonogenic assays, as well as in vivo tumorigenicity experiments in NOD-SCID-Gamma mice. RESULTS:Depletion of BAP1 in uveal melanoma cells resulted in a loss of differentiation and gain of stem-like properties, including expression of stem cell markers, increased capacity for self-replication, and enhanced ability to grow in stem cell conditions. BAP1 depletion did not result in increased proliferation, migration, invasion or tumorigenicity. CONCLUSIONS:BAP1 appears to function in the uveal melanocyte lineage primarily as a regulator of differentiation, with cells deficient for BAP1 exhibiting stem-like qualities. It will be important to elucidate how this effect of BAP1 loss promotes metastasis and how to reverse this effect therapeutically.

SUBMITTER: Matatall KA 

PROVIDER: S-EPMC3846494 | biostudies-literature | 2013 Aug

REPOSITORIES: biostudies-literature

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BAP1 deficiency causes loss of melanocytic cell identity in uveal melanoma.

Matatall Katie A KA   Agapova Olga A OA   Onken Michael D MD   Worley Lori A LA   Bowcock Anne M AM   Harbour J William JW  

BMC cancer 20130805


<h4>Background</h4>Uveal melanoma is a highly aggressive cancer with a strong propensity for metastasis, yet little is known about the biological mechanisms underlying this metastatic potential. We recently showed that most metastasizing uveal melanomas, which exhibit a class 2 gene expression profile, contain inactivating mutations in the tumor suppressor BAP1. The aim of this study was to investigate the role of BAP1 in uveal melanoma progression.<h4>Methods</h4>Uveal melanoma cells were studi  ...[more]

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