Abstract
Cytokine-inducers prevent insulin-dependent diabetes mellitus (IDDM) in animal models. We extended this therapy to non-insulin-dependent diabetes mellitus (NIDDM), because it was reported that diabetes of KK-Ay mice, a model for NIDDM, was recovered by allogenic bone-marrow transplantation that also prevented IDDM in animal models.
An i.p. or i.v. injection of streptococcal preparation (OK 432) lowered fasting blood glucose (FBG) levels and markedly improved glucose tolerance test (GTT) in KK-Ay mice for more than 32 h regardless of the glucose loading routes (oral, i.v. or i.p.), while an i.v. injection of BCG improved FBG and GTT for more than 4 wks without body weight loss. The improvement of FBG and GTT with OK-432 was brought about in other NIDDM animals, GK rats and Wistar fatty rats. Among various cytokines possibly induced by OK-432 and BCG, IL-1α, TNFα and lymphotoxin significantly improved FBG and GTT in KK-Ay mice, whereas IL-2 and IFNγ did not. There were no differences between the OK-432-treated KK-Ay mice and control in histology of the pancreas, degree of insulin-induced decrease in blood glucose levels, and muscle glycogen synthase activities. As to insulin secretion, there is a tendency that the OK-432-treatment less than 1 week did not affect insulin levels during GTT, whereas the treatment more than 2 weeks increased the insulin levels.
Thus, cytokine-inducers improved FBG and glucose tolerance of NIDDM animals probably via cytokines. The results imply a role of the cytokines in glucose tolerance of NIDDM, although precise immune and metabolic mechanisms remain to be elucidated.
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Zhu, X.P., Satoh, J., Muto, G. et al. Improvement of glucose tolerance with immunomodulators in type 2 diabetic animals. Biotherapy 9, 189–197 (1996). https://doi.org/10.1007/BF02620732
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DOI: https://doi.org/10.1007/BF02620732