Neuroendocrine and immune system in genetically polydipsic mice and development of animal model in response to environmental stress

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The purpose of this study was to investigate the characteristics of genetically polydipsic mice from the higher function to genetics and the mechanisms of the neuroendocrine and immune responses to environmental stress in order to establish the animal model in response to the environmental stress. The polydipsic mice showed multiple abnormality as follows. 1. They may have abnormality of the muscarinic receptors in the saalivary glands and blood vessels. 2. The activity of the superior laryngeal nerve was lowar than control mice and large responses to high concentration of saline. 3. The thereshold of the nociceptive stress was lower tahn control mice and may be involved in the abnormality of mu-opiod receptor. 4. Although the number of thymic cells was increased, the differentiation of T cell was abnormal. 5. The glucocorticoid receptors expressed highly in the hypothalamic paraventricular nucleus, subfornical organ, amygdala and hippocampus. 6. The production of nitric oxide (NO) and NO synthase were increased in the paraventricular nucleus and decreased in the posterior pituitary. 7. The expression of vasopressin gene in the hypothalamus was increased after they became polydipsia. The genes of vasopressin and V2 receptor had no essential mutation. 8. Learning behavior showed abnormal in comparison with control mice. These results suggest that genetically polydipsic mice have multiple abnormality and useful animal model to investigate the responses to environmental stress.