Morphofunctional immune disorders were revealed in vasopressin-deficient Brattleboro rats with diabetes insipidus during ontogeny. We observed a permanent decrease in the number of blood lymphocytes, increase in neutrophil count, reduced activity of macrophages, early involution of the thymus and spleen, and suppression of antibody production. These changes reflect impaired general resistance of these animals.
Stable deceleration of Walker 256 tumor growth was detected in Brattleboro rats with vasopressin synthesis defect in comparison with normal WAG rats. In contrast to continuous tumor growth typical of rats, the growth of this tumor in Brattleboro rats was negligible and was observed during the first 15-18 days after transplantation, after which the tumor regressed and disappeared. The effect was age-dependent and was more pronounced in old animals. Repeated injection of Walker 256 cells does not lead to tumor development, which attested to direct involvement of the immune system in the detected phenomenon.
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