RESUMO
Haematological and serum biochemical measurements in male spontaneously epileptic rats (SER; double mutants homozygous for zitter and tremor genes) were compared with the values for related rat strains. Some haematological values were low in TRM rats and total leukocyte counts were high in ZI and TRM rats. TRM rats showed higher total cholesterol, phospholipid, high-density lipoprotein cholesterol and calcium values, and lower albumin value than Kyo: Wistar rats. Zitter homozygous rats including SER exhibited low total cholesterol, phospholipid and high-density lipoprotein cholesterol values. The SER showed an increase in urea nitrogen, aspartate aminotransferase and alanine aminotransferase values, and a decrease in glucose value, suggesting deterioration of the whole body with age.
Assuntos
Análise Química do Sangue/veterinária , Epilepsia/veterinária , Doenças dos Roedores/sangue , Animais , Peso Corporal , Epilepsia/sangue , Epilepsia/genética , Testes Hematológicos/veterinária , Masculino , Fenótipo , Ratos , Ratos Endogâmicos WKY , Doenças dos Roedores/genética , Testes Sorológicos/veterináriaRESUMO
Four-, 13- and 52-week repeated dose toxicity studies of taltirelin tetrahydrate(TA-0910), a thyrotropin-releasing hormone(TRH) analogue, were carried out in rats. Through the three studies, TA-0910 solution was administered orally at doses of 3, 30 and 300 mg/kg/day. The animals receiving TA-0910 showed hyperlocomotion, grooming and wet dog shaking which were attributable to the central effects similar to those of TRH, but there was no death nor obvious deterioration of health caused by the treatment. Body weights decreased in males of 300 mg/kg group, and food consumption was on the upward trend in females in 300 mg/kg group. In 13- and 52-week studies, females receiving 300 mg/kg showed elongated estrous cycle, although it was not an evident change. Blood examinations revealed increases in erythrocyte count, hemoglobin and hematocrit in 300 mg/kg group. Reductions in serum(plasma) proteins and lipids, and drug-metabolizing enzyme activity of the liver were regarded as non-specific changes, as they were sporadic and slight in 300 mg/kg group. Salivary gland and adrenal weights increased in 300 mg/kg group. For the thyroid, weights increased in 300 mg/kg group in the 4- and 13-week studies, and increases of microfollicles and cell debris were observed microscopically in each treated group in the 52-week study. These changes seemed to be related with hormonal action of TA-0910, but the effects on animals were judged slight from plasma TSH and thyroid hormone levels after 4 weeks of dosing. The non-toxic dose was estimated to be 30 mg/kg/day, through the rat repeated dose toxicity studies. All the above changes were alleviated or abolished by 4-week recovery period.
Assuntos
Nootrópicos/toxicidade , Hormônio Liberador de Tireotropina/análogos & derivados , Administração Oral , Animais , Peso Corporal/efeitos dos fármacos , Relação Dose-Resposta a Droga , Ingestão de Alimentos/efeitos dos fármacos , Feminino , Asseio Animal/efeitos dos fármacos , Hipercinese/induzido quimicamente , Masculino , Nootrópicos/administração & dosagem , Tamanho do Órgão/efeitos dos fármacos , Ratos , Ratos Wistar , Glândula Tireoide/efeitos dos fármacos , Hormônio Liberador de Tireotropina/administração & dosagem , Hormônio Liberador de Tireotropina/toxicidade , Fatores de TempoRESUMO
Rats were maintained on 50 kGy electron irradiation diets. Effects of the diets on reproductive performance of parents and developmental performance of fetuses (F1 and F2) were studied by comparison with data in rats maintained on gamma irradiation diets, as control animals, and the background data of our facility. As the result, no specific changes were observed in the group maintained on electron irradiation diets. Electron irradiation diets sterilized under the condition of 50 kGy irradiation in the present study, as well as the existing gamma irradiation diets, were found to be useful for breeding and nursing rats.
