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Aim: Sex hormones, including testosterone and estrogen, result in various pathophysiological changes in the body. To evaluate the pathophysiological changes following gonadectomy in male and female rats, we performed gonadectomy at the same age in male and female Sprague-Dawley (SD) rats. Methods: Male and female Sprague-Dawley rats castrated by bilaternal orchidectomy and ovariectomy at 6 weeks of age (six animals of each sex per group). Food intake, body weight, and clinical chemical parameters such as glucose, insulin, triglyceride and total cholesterol levels, were examined every 4 weeks from 8 to 40 weeks of age. Statistical analysis of differences between Original Research Article Miyajima et al.; BJMMR, 9(6): 1-8, 2015; Article no.BJMMR.19115 2 control and gonadectomized rats was performed using the F-test, followed by the Student’s t-test or Aspin-Welch’s t-test. Results: In orchidectomized (ORX) rats, food intakes and body weights were decreased, whereas in ovariectomized (OVX) rats, the body weights were significantly elevated without an obvious change in food intake. In clinical chemical analysis, hypercholesterolemia was observed in both ORX and OVX rats, but the triglyceride level was obviously decreased only in ORX rats during the observational period. In OVX rats, decrease of insulin sensitivity and significant increase of adipose tissue weights were observed. In bone metabolic analysis, bone mineral content in ORX rats and bone mineral density in OVX rats were decreased, respectively. Conclusion: Both orchidectomy and ovariectomy in rats affect glucose/lipid and bone metabolism, and especially, the glucose metabolism was deteriorated in OVX rats. Both male and female sex hormones play a key role in metabolic disease, such as diabetes, hyperlipidemia and osteoporosis.

Aim: The Spontaneously Diabetic Torii (SDT) fatty rat is a novel obese type 2 dia betic model, showing hyperphagia, obesity, and diabetes mellitus from a young age. In this study, we investigated the effects of isolation stress on pathophysiology in SDT fatty rats. Methods: SDT fatty rats (4 weeks old) were housed 3 per cage for 2 weeks and separated as males or females so as each gender will be placed in a separate cage to avoid mating. After acclimatization in 6 weeks of age, the rats were exposed to isolation stress (IS) (one rat per cage, using 5 animals in each sex). In the control group, each sex of experimental rats were housed