Celecoxib, a cyclooxygenase-2 inhibitor, prevents induction of liver preneoplastic lesions in rats
| Autor: | María Cristina Trejo-Solís, Lucrecia Márquez-Rosado, Saúl Villa-Treviño, Claudia M. García-Cuellar |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Male
medicine.medical_specialty Pharmacology Lesion Rats Sprague-Dawley chemistry.chemical_compound Liver Neoplasms Experimental In vivo Internal medicine medicine Animals Cyclooxygenase Inhibitors Sulfonamides Hepatology biology Liver Neoplasms Proliferating cell nuclear antigen Rats Endocrinology chemistry Enzyme inhibitor Apoptosis Celecoxib Models Animal biology.protein Pyrazoles lipids (amino acids peptides and proteins) 2-Acetylaminofluorene Cyclooxygenase medicine.symptom Precancerous Conditions medicine.drug |
| Zdroj: | Journal of hepatology. 43(4) |
| ISSN: | 0168-8278 |
| Popis: | Background/Aims Several studies suggest that cyclooxygenase-2 (COX-2) inhibitors are chemopreventive agents against colon, breast and skin cancer. In this study, we evaluated the chemopreventive effect of celecoxib, a specific COX-2 inhibitor, on the development of liver preneoplastic lesions in rats. Methods Male Sprague–Dawley rats were fed during 5 weeks either a control or an experimental diet containing 1500ppm celecoxib on a medium-term hepatocarcinogenesis protocol. Livers were collected and evaluated by histological and biochemical assays. Results A reduction by 80 and 90% both in the number and size of altered hepatic foci was observed in the group treated with celecoxib during hepatocarcinogenesis treatment, respectively. No evidence of apoptosis was observed in our present study, however, the expression of the proliferation markers such as PCNA and Ki-67 was drastically reduced. Interestingly, neither COX-2 expression nor prostaglandin-E 2 (PGE 2 ) production were altered by the hepatocarcinogenic treatment or celecoxib treatment. Finally, celecoxib inhibited the translocation of Rel A/p65 to the nucleus with significant effect on stability of the repressor IκB-α. Conclusions This is the first demonstration that a specific COX-2 inhibitor, celecoxib, possesses striking chemopreventive activity, inhibiting preneoplastic lesions during hepatocarcinogenesis in vivo, suggesting that celecoxib effects are mediated by PGE 2 -independent mechanisms. |
| Databáze: | OpenAIRE |
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