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- Title
Suppression of Cancer Progression by MGAT1 shRNA Knockdown.
- Authors
Zavareh, Reza Beheshti; Sukhai, Mahadeo A.; Hurren, Rose; Gronda, Marcela; Xiaoming Wang; Simpson, Craig D.; Maclean, Neil; Zih, Francis; Ketela, Troy; Swallow, Carol J.; Moffat, Jason; Rose, David R.; Schachter, Harry; Schimmer, Aaron D.; Dennis, James W.; Ming Tat Ling
- Abstract
Oncogenic signaling promotes tumor invasion and metastasis, in part, by increasing the expression of tri- and tetrabranched N-glycans. The branched N-glycans bind to galectins forming a multivalent lattice that enhances cell surface residency of growth factor receptors, and focal adhesion turnover. N-acetylglucosaminyltransferase I (MGAT1), the first branching enzyme in the pathway, is required for the addition of all subsequent branches. Here we have introduced MGAT1 shRNA into human HeLa cervical and PC-3-Yellow prostate tumor cells lines, generating cell lines with reduced transcript, enzyme activity and branched N-glycans at the cell surface. MGAT1 knockdown inhibited HeLa cell migration and invasion, but did not alter cell proliferation rates. Swainsonine, an inhibitor of a-mannosidase II immediately downstream of MGAT1, also inhibited cell invasion and was not additive with MGAT1 shRNA, consistent with a common mechanism of action. Focal adhesion and microfilament organization in MGAT1 knockdown cells also indicate a less motile phenotype. In vivo, MGAT1 knockdown in the PC-3-Yellow orthotopic prostate cancer xenograft model significantly decreased primary tumor growth and the incidence of lung metastases. Our results demonstrate that blocking MGAT1 is a potential target for anti-cancer therapy.
- Subjects
CANCER invasiveness; ONCOGENES; METASTASIS; GLYCANS; GALECTINS; GROWTH factors; FOCAL adhesions
- Publication
PLoS ONE, 2012, Vol 7, Issue 9, p1
- ISSN
1932-6203
- Publication type
Article
- DOI
10.1371/journal.pone.0043721