alexa Glypican-3 expression is silenced in human breast cancer.
Biochemistry

Biochemistry

Journal of Glycobiology

Author(s): Xiang YY, Ladeda V, Filmus J

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Abstract Glypican-3 (GPC3) is a membrane-bound heparan sulfate proteoglycan that is mutated in the Simpson-Golabi-Behmel syndrome. This is an X-linked condition characterized by overgrowth, and various visceral and skeletal dysmorphisms. The phenotype of the Simpson-Golabi-Behmel syndrome patients and GPC3-deficient mice, as well as gene transfection experiments indicate that GPC3 can act as an inhibitor of cell proliferation and survival. It has been previously shown that GPC3 expression is downregulated in mesotheliomas and ovarian cancer. Here we report that GPC3 expression is also silenced in human breast cancer, and that this silencing is due, at least in part, to hypermethylation of the GPC3 promoter. Ectopic expression of GPC3 inhibited growth in eight out of 10 breast cancer cell lines. Collectively, these data suggest that GPC3 can act as a negative regulator of breast cancer growth. This article was published in Oncogene and referenced in Journal of Glycobiology

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