4.1 Article

Upregulated hPuf-A promotes breast cancer tumorigenesis

Journal

TUMOR BIOLOGY
Volume 34, Issue 5, Pages 2557-2564

Publisher

SPRINGER
DOI: 10.1007/s13277-013-0801-4

Keywords

hPuf-A; Puf; Breast cancer; DDX3; RbAp48

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Funding

  1. National Science Council of Taiwan [NSC 101-2311-B-002-008]
  2. National Taiwan University [10R70602B3]

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hPuf-A is a member of RNA-binding PUF family that regulates mRNA translation. Redistribution of hPuf-A from the nucleolus to the nucleoplasm upon genotoxic stress modulates the poly(ADP-ribosyl)ation activity of PARP-1. Here, we report a novel function of hPuf-A involved in promoting breast cancer progression. Immunohistochemical studies showed higher expression levels of hPuf-A in stage I, II, III, and IV breast cancer specimens in contrast with those of hPuf-A in ductal carcinoma in situ. The presence of hPuf-A is highly associated with colony formation capacities in breast cancer T47D and MDA-MB-231 cells. Xenograft growth of hPuf-A-silenced and hPuf-A overexpressing MDA-MB-231 cells in nude mice was substantially in concert with colony formation capacities. This promoting effect of hPuf-A in tumorigenesis might be correlated with the regulation of its associated mRNAs, such as RbAp48 and DDX3. Collectively, hPuf-A may have diagnostic values in breast cancer progression.

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