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Härdtner, C.* ; Multhoff, G. ; Falk, W.* ; Radons, J.*

(-)-Epigallocatechin-3-gallate, a green tea-derived catechin, synergizes with celecoxib to inhibit IL-1-induced tumorigenic mediators by human pancreatic adenocarcinoma cells Colo357.

Eur. J. Pharmacol. 684, 36-43 (2012)
DOI
Open Access Green as soon as Postprint is submitted to ZB.
Despite their toxic side effects prostaglandin H(2) synthase-2 (PGHS-2) inhibitors hold promise for cancer chemoprevention. In order to overcome adverse effects lower doses of PGHS-2 inhibitors could be applied in combination with other agents exhibiting complementary effects. Herein, the effects of the PGHS-2-specific inhibitor celecoxib either alone or in combination with the green tea-derived catechin (-)-epigallocatechin-3-gallate (EGCG) were studied on the expression of interleukin (IL)-1-induced tumorigenic factors in Colo357 human pancreatic adenocarcinoma cells. This approach mimics tumor-associated pancreatic inflammation which is considered as a key player in pancreatic malignancy. We found that co-incubation of Colo357 with celecoxib and EGCG synergistically diminished metabolic activity via apoptosis induction and down-regulated release of pro-angiogenic vascular endothelial growth factor (VEGF) and invasiveness-promoting matrix metalloproteinase (MMP)-2 to a maximum of 30%. Celecoxib and EGCG synergistically reduced IL-1-induced production of pro-inflammatory IL-6 and pro-angiogenic IL-8 to 23-50%. Celecoxib dose-dependently increased PGHS-2 levels. Whereas EGCG was able to compensate for celecoxib-mediated increase of PGHS-2, it failed to potentiate celecoxib-mediated suppression of prostaglandin E(2) (PGE(2)) release. Thus, in Colo357, EGCG synergistically boosts celecoxib-mediated effects and reduces the levels of celecoxib required to elicit beneficial effects on tumorigenic mediators by a factor of ten.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Pancreatic carcinoma; Celecoxib; EGCG; IL-1; Colo357; PGHS-2; NONSTEROIDAL ANTIINFLAMMATORY DRUGS; PROSTAGLANDIN-E SYNTHASE; PROSTATE-CANCER CELLS; IN-VITRO; CARDIOVASCULAR RISK; SIGNALING PATHWAYS; CARCINOMA CELLS; POLYPHENON-E; TUMOR-CELLS; NK CELLS
ISSN (print) / ISBN 0014-2999
e-ISSN 0014-2999
Quellenangaben Volume: 684, Issue: 1-3, Pages: 36-43 Article Number: , Supplement: ,
Publisher Elsevier
Reviewing status Peer reviewed