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1.
Toxicol Pathol ; 38(2): 267-79, 2010 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-20100840

RESUMO

BMS-645737, an inhibitor of vascular endothelial growth factor (VEGF) receptor-2 and fibroblast growth factor (FGF) receptor-1, has anti-angiogenic activity and was evaluated in nonclinical studies as a treatment for cancer. This article characterizes the BMS-645737-induced clinical, gross, and histologic lesions of incisor teeth in Sprague-Dawley (SD) rats. Rats received 0 800 mg/kg BMS-645737 in a single-dose study or consecutive daily doses of 0 20 mg/kg/day in a 1-month study. The reversibility of these effects was assessed in the 1-month study. White discoloration and fracture of incisors were observed clinically and grossly in the 1-month study. In both studies, dose-dependent histopathologic lesions of incisors were degeneration and/or necrosis of odontoblasts and ameloblasts; decreased mineralization of dentin; inflammation and necrosis of the dental pulp; and edema, congestion, and hemorrhage in the pulp and periodontal tissue adjacent to the enamel organ. Partial recovery was observed at lower doses after a two-week dose-free period in the one-month study. Drug-induced incisor lesions were considered to be related to the pharmacologic inhibitory effects on VEGF and FGF signaling, that is, inhibition of growth and maintenance of small-diameter vessels that support the formation of dentin and enamel in growing teeth and/or to perturbances of function of odontoblasts and ameloblasts or their precursors.


Assuntos
Inibidores da Angiogênese/toxicidade , Incisivo/efeitos dos fármacos , Inibidores de Proteínas Quinases/toxicidade , Pirróis/toxicidade , Receptor Tipo 1 de Fator de Crescimento de Fibroblastos/antagonistas & inibidores , Triazinas/toxicidade , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/antagonistas & inibidores , Animais , Dentina/metabolismo , Relação Dose-Resposta a Droga , Feminino , Incisivo/patologia , Masculino , Necrose , Odontoblastos/efeitos dos fármacos , Odontoblastos/metabolismo , Ratos , Ratos Sprague-Dawley , Testes de Toxicidade
2.
Toxicol Pathol ; 32(4): 448-66, 2004.
Artigo em Inglês | MEDLINE | ID: mdl-15204968

RESUMO

Analysis of organ weight in toxicology studies is an important endpoint for identification of potentially harmful effects of chemicals. Differences in organ weight between treatment groups are often accompanied by differences in body weight between these groups, making interpretation of organ weight differences more difficult. Using data from control rats that were part of 26 toxicity studies conducted under similar conditions, we have evaluated the relationship between organ weight and body/brain weight to determine which endpoint (organ weight, organ-to-body weight ratio, or organ-to-brain weight ratio) is likely to accurately detect target organ toxicity. This evaluation has shown that analysis of organ-to-body weight ratios is predictive for evaluating liver and thyroid gland weights, and organ-to-brain weight ratios is predictive for evaluating ovary and adrenal gland weights. Brain, heart, kidney, pituitary gland, and testes weights are not modeled well by any of the choices, and alternative analysis methods such as analysis of covariance should be utilized.


Assuntos
Peso Corporal/efeitos dos fármacos , Encéfalo/efeitos dos fármacos , Determinação de Ponto Final/veterinária , Fígado/efeitos dos fármacos , Tamanho do Órgão/efeitos dos fármacos , Glândula Tireoide/efeitos dos fármacos , Testes de Toxicidade Aguda/veterinária , Animais , Feminino , Modelos Lineares , Masculino , Especificidade de Órgãos/efeitos dos fármacos , Valor Preditivo dos Testes , Ratos , Ratos Endogâmicos , Estudos Retrospectivos
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