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- W2076663174 abstract "The molecular mechanisms that enable cyclooxygenase-2 (COX-2) and its mediator prostaglandin E2 (PGE2) to inhibit transforming growth factor-β (TGF-β) signaling during mammary tumorigenesis remain unknown. We show here that TGF-β selectively stimulated the expression of the PGE2 receptor EP2, which increased normal and malignant mammary epithelial cell (MEC) invasion, anchorage-independent growth, and resistance to TGF-β-induced cytostasis. Mechanistically, elevated EP2 expression in normal MECs inhibited the coupling of TGF-β to Smad2/3 activation and plasminogen activator inhibitor-1 (PAI1) expression, while EP2 deficiency in these same MECs augmented Smad2/3 activation and PAI expression stimulated by TGF-β. Along these lines, engineering malignant MECs to lack EP2 expression prevented their growth in soft agar, restored their cytostatic response to TGF-β, decreased their invasiveness in response to TGF-β, and potentiated their activation of Smad2/3 and expression of PAI stimulated by TGF-β. More important, we show that COX-2 or EP2 deficiency both significantly decreased the growth, angiogenesis, and pulmonary metastasis of mammary tumors produced in mice. Collectively, this investigation establishes EP2 as a potent mediator of the anti-TGF-β activities elicited by COX-2/PGE2 in normal and malignant MECs. Our findings also suggest that pharmacological targeting of EP2 receptors may provide new inroads to antagonize the oncogenic activities of TGF-β during mammary tumorigenesis.—Tian, M., Schiemann, W. P. PGE2 receptor EP2 mediates the antagonistic effect of COX-2 on TGF-β signaling during mammary tumorigenesis. FASEB J. 24, 1105–1116 (2010). www.fasebj.org" @default.
- W2076663174 created "2016-06-24" @default.
- W2076663174 creator A5063812000 @default.
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- W2076663174 date "2009-11-06" @default.
- W2076663174 modified "2023-10-18" @default.
- W2076663174 title "PGE2 receptor EP2 mediates the antagonistic effect of COX‐2 on TGF‐β signaling during mammary tumorigenesis" @default.
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- W2076663174 doi "https://doi.org/10.1096/fj.09-141341" @default.
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