Hypoglycemic Activity of To-Kai-San (Chinese Medicines) in Normal and KK-Ay Mice

概要

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The hypoglycemic effect of To-Kai-San (TS) was studied in normal mice, streptozotocin-induced diabetic mice, one of the animal models of insulin-dependent diabetes mellitus (IDDM) with hypoinsulin-emia, and KK-Ay mice, one of the animal models of non-insulin-dependent diabetes mellitus (NIDDM) with hyperinsulinemia. TS (1, 500mg/kg) reduced the blood glucose of the KK-Ay mice from 441±36 to 285±52 mgt 100ml 7 h after a single oral administration (p<0.001). However, no changes in blood glucose were observed in the normal and STZ-induced diabetic mice. TS also decreased the blood glucose 20 days after repeated administration to normal and KK-Ay mice. In addition, TS-treated KK-Ay mice showed decreased plasma insulin levels after both single and repeated administration. From these findings, it is believed that TS may require the presence of insulin to display its activity.
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