Hypoglycemic Effects of Compounds from Crude Drugs focused on the participation of Monoamine Neurotransmitters in Blood Glucose Regulation

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The sulfonated derivatives from Shokyo and Kankyo have a glucose-lowering effect on loading sugar, which may be based on inhibition of the activity of saccharide hydrolyzing enzyme. Also, the repeated administration of 6-gingesulfonic acid for five weeks showed continuous hypoglycemic effects throughout the experimental periods in KK-A^y mice. Concomitantly, the hypoglycemic effects of 6-GS were correlated with the increased brain serotonin levels. These findings suggest that serum glucose concentrations influence on the brain monoamine neurotransmitters metabolism in KK-A^y mice.