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result sql = Differential effects between cyclooxygenase-2 inhibitors and siRNA on vascular endothelial growth factor production in head and neck squamous cell carcinoma cell lines.
Differential effects between cyclooxygenase-2 inhibitors and siRNA on vascular endothelial growth factor production in head and neck squamous cell carcinoma cell lines.
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result sql = BACKGROUND : Several researchers have observed that cyclooxygenase-2 (COX-2) inhibitors display anticancer effects only at higher concentrations than doses that block COX-2 activity in head and neck squamous cell carcinoma (HNSCC) cells.

METHODS : To better understand the exact anticancer mechanism of COX-2-inhibitors, we compared the effects of pharmacologic inhibitors to those of small-interfering RNA against COX-2 on cell-growth, vascular endothelial growth factor (VEGF) production, and intracellular signaling in HNSCC cell lines.

RESULTS : We observed in HNSCC cells, that COX-2-siRNA induced an inhibitory effect on intracellular signaling, but unlike the pharmacologic inhibitors, did not affect cell proliferation. Whereas the chemical inhibitors increased VEGF synthesis even at low doses, COX-2-siRNA showed differential inhibition of VEGF production according to expression patterns of COX-1 and COX-2 in tested cells.

CONCLUSION : The majority of the anticancer effects of COX-2-inhibitors in HNSCC cells seem to result from COX-2-independent action, suggesting that COX-1 and COX-2 may contribute to VEGF synthesis in cancer cells through a prostaglandin-dependent mechanism.

Publication: Head Neck 2010 Nov ;32(11)::1534-43. :doi: 10.1002/hed.21362.
Publication Date: 2010 Nov
Study Author(s): Park, Seok-Woo;Kim, Hyo-Sun;Hah, Jeong-Hun;Kim, Kwang-Hyun;Heo, Dae-Seog;Sung, Myung-Whun;
Institution: Cancer Research Institute, Seoul National University College of Medicine, 28, Yongun-dong, Chongno-gu, Seoul, Korea.
Shortcut link to this study:
BACKGROUND : Several researchers have observed that cyclooxygenase-2 (COX-2) inhibitors display anticancer effects only at higher concentrations than doses that block COX-2 activity in head and neck squamous cell carcinoma (HNSCC) cells.

METHODS : To better understand the exact anticancer mechanism of COX-2-inhibitors, we compared the effects of pharmacologic inhibitors to those of small-interfering RNA against COX-2 on cell-growth, vascular endothelial growth factor (VEGF) production, and intracellular signaling in HNSCC cell lines.

RESULTS : We observed in HNSCC cells, that COX-2-siRNA induced an inhibitory effect on intracellular signaling, but unlike the pharmacologic inhibitors, did not affect cell proliferation. Whereas the chemical inhibitors increased VEGF synthesis even at low doses, COX-2-siRNA showed differential inhibition of VEGF production according to expression patterns of COX-1 and COX-2 in tested cells.

CONCLUSION : The majority of the anticancer effects of COX-2-inhibitors in HNSCC cells seem to result from COX-2-independent action, suggesting that COX-1 and COX-2 may contribute to VEGF synthesis in cancer cells through a prostaglandin-dependent mechanism.
PMID: 20222044

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