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Celecoxib inhibits phorbol ester-induced expression of COX-2 and activation of AP-1 and p38 MAP kinase in mouse skin.
Carcinogenesis. 2004 May; 25(5):713-22.C

Abstract

Celecoxib, the first US FDA-approved selective cyclooxygenase-2 (COX-2) inhibitor initially developed for the treatment of adult rheumatoid arthritis and osteoarthritis, was reported to reduce the polyp burden in patients with familial adenomatous polyposis. This specific COX-2 inhibitor also protects against experimentally induced carcinogenesis, but molecular mechanisms underlying its chemopreventive activities remain largely unresolved. In the present work, we found that celecoxib inhibited 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced expression of COX-2 in female ICR mouse skin when applied topically 30 min prior to TPA as determined by both immunoblot and immunohistochemical analyses. In another study, celecoxib attenuated the DNA binding activity of activator protein 1 (AP-1) through suppression of c-Jun and c-Fos expression in TPA-treated mouse skin. In addition, celecoxib inhibited both the catalytic activity and phosphorylation of p38 mitogen-activated protein (MAP) kinase. In the same animal model, TPA treatment resulted in rapid activation via phosphorylation of extracellular signal-regulated protein kinase (ERK)1/2 and p38 MAP kinase, which are upstream of AP-1 in mouse skin. In order to clarify the roles of p38 and ERK in TPA-induced AP-1 activation, we utilized the pharmacologic inhibitors of these enzymes. The p38 inhibitor SB203580 blocked TPA-mediated AP-1 activation, while the MEK1/2 inhibitor U0126 was not inhibitory despite suppression of c-Fos expression in mouse skin. Furthermore, SB203580 markedly inhibited COX-2 expression induced by TPA. Taken together, these findings suggest that celecoxib down-regulates COX-2 by blocking activation of p38 MAP kinase and AP-1, which may represent molecular mechanisms underlying antitumor promoting effects of this drug on mouse skin tumorigenesis.

Authors+Show Affiliations

College of Pharmacy, Seoul National University, Seoul, Korea.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

14729583

Citation

Chun, Kyung-Soo, et al. "Celecoxib Inhibits Phorbol Ester-induced Expression of COX-2 and Activation of AP-1 and P38 MAP Kinase in Mouse Skin." Carcinogenesis, vol. 25, no. 5, 2004, pp. 713-22.
Chun KS, Kim SH, Song YS, et al. Celecoxib inhibits phorbol ester-induced expression of COX-2 and activation of AP-1 and p38 MAP kinase in mouse skin. Carcinogenesis. 2004;25(5):713-22.
Chun, K. S., Kim, S. H., Song, Y. S., & Surh, Y. J. (2004). Celecoxib inhibits phorbol ester-induced expression of COX-2 and activation of AP-1 and p38 MAP kinase in mouse skin. Carcinogenesis, 25(5), 713-22.
Chun KS, et al. Celecoxib Inhibits Phorbol Ester-induced Expression of COX-2 and Activation of AP-1 and P38 MAP Kinase in Mouse Skin. Carcinogenesis. 2004;25(5):713-22. PubMed PMID: 14729583.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Celecoxib inhibits phorbol ester-induced expression of COX-2 and activation of AP-1 and p38 MAP kinase in mouse skin. AU - Chun,Kyung-Soo, AU - Kim,Su-Hyeong, AU - Song,Yong-Sang, AU - Surh,Young-Joon, Y1 - 2004/01/16/ PY - 2004/1/20/pubmed PY - 2004/6/15/medline PY - 2004/1/20/entrez SP - 713 EP - 22 JF - Carcinogenesis JO - Carcinogenesis VL - 25 IS - 5 N2 - Celecoxib, the first US FDA-approved selective cyclooxygenase-2 (COX-2) inhibitor initially developed for the treatment of adult rheumatoid arthritis and osteoarthritis, was reported to reduce the polyp burden in patients with familial adenomatous polyposis. This specific COX-2 inhibitor also protects against experimentally induced carcinogenesis, but molecular mechanisms underlying its chemopreventive activities remain largely unresolved. In the present work, we found that celecoxib inhibited 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced expression of COX-2 in female ICR mouse skin when applied topically 30 min prior to TPA as determined by both immunoblot and immunohistochemical analyses. In another study, celecoxib attenuated the DNA binding activity of activator protein 1 (AP-1) through suppression of c-Jun and c-Fos expression in TPA-treated mouse skin. In addition, celecoxib inhibited both the catalytic activity and phosphorylation of p38 mitogen-activated protein (MAP) kinase. In the same animal model, TPA treatment resulted in rapid activation via phosphorylation of extracellular signal-regulated protein kinase (ERK)1/2 and p38 MAP kinase, which are upstream of AP-1 in mouse skin. In order to clarify the roles of p38 and ERK in TPA-induced AP-1 activation, we utilized the pharmacologic inhibitors of these enzymes. The p38 inhibitor SB203580 blocked TPA-mediated AP-1 activation, while the MEK1/2 inhibitor U0126 was not inhibitory despite suppression of c-Fos expression in mouse skin. Furthermore, SB203580 markedly inhibited COX-2 expression induced by TPA. Taken together, these findings suggest that celecoxib down-regulates COX-2 by blocking activation of p38 MAP kinase and AP-1, which may represent molecular mechanisms underlying antitumor promoting effects of this drug on mouse skin tumorigenesis. SN - 0143-3334 UR - https://www.unboundmedicine.com/medline/citation/14729583/Celecoxib_inhibits_phorbol_ester_induced_expression_of_COX_2_and_activation_of_AP_1_and_p38_MAP_kinase_in_mouse_skin_ L2 - https://academic.oup.com/carcin/article-lookup/doi/10.1093/carcin/bgh076 DB - PRIME DP - Unbound Medicine ER -