Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/21527
Título: Anti-inflammatory, anti-proliferative and antioxidant profiles of selective cyclooxygenase-2 inhibition as chemoprevention for rat bladder carcinogenesis
Autor: Parada, Belmiro
Sereno, Jose
Reis, Flavio
Teixeira-Lemos, Edite
Garrido, Patricia
Pinto, Angela Filipa
Cunha, Maria Fernanda
Pinto, Rui
Mota, Alfredo
Figueiredo, Arnaldo
Teixeira, Frederico
Palavras-chave: Oncology
Data: 2009
Citação: CANCER BIOLOGY & THERAPY. - Vol. 8, n. 17 (SEP 1 2009), p. 1622-1629
Resumo: Purpose: To evaluate the efficacy of a selective cyclooxygenase-2 (COX-2) inhibitor in rat bladder cancer chemoprevention, as well as to assess the relevance of inflammation, proliferation and oxidative stress in tumor growth and in its prevention. Results: The main findings were: (I) the incidence of carcinoma was: control: 0% (0/8); BBN: 65% (13/20); CEL: 0% (0/8) and BBN + CEL: 12.5% (1/8); (II) the mean tumor volume per rat with tumor and per tumor were significantly lower in the BBN + CEL group (21.2 and 5.3 +/- 0.4 mm(3)) vs. BBN (138.5 +/- 7.5 and 112.5 +/- 6.4 mm(3)); (III) the incidence of pre-neoplasic (hyperplasia and dysplasia) and neoplasic (papillary tumors and carcinoma in situ-CIS) lesions were notoriously reduced in the CEL + BBN treatment; (IV) CEL significantly reduced serum TGF beta 1 and CRP and increase TNF alpha and IL-1 beta (p 0.001); (V) CEL reduced MDA formation in serum (p 0.001) and liver (p 0.05) and also showed a trend to reduction in kidney. Methods: Drug treatments were performed during the first 8 w, followed by 12 w for tumor expression/prevention, in the following groups: control-vehicle; carcinogen-0.05% of N-butyl-N-(4-hydroxybutyl)nitrosamine (BBN); celecoxib (CEL)-10 mg/kg/day and preventive CEL + BBN. The bladders were analyzed for number and volume of tumor and nature of urothelium lesions. Serum was assessed for markers of inflammation, proliferation and redox status. Conclusions: Celecoxib has demonstrated an outstanding inhibitory effect on bladder cancer chemoprevention, which might be due to its expected anti-inflammatory actions, as well as by anti-proliferatory and antioxidant actions. This data supports a pivotal role of cancer chemoprevention strategies based on COX-2 inhibition.
URI: http://hdl.handle.net/10451/21527
ISSN: 1538-4047
Aparece nas colecções:FF - Produção Científica 2000-2009

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