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Abstract Title:

Wild Strawberry, Blackberry, and Blueberry Leaf Extracts Alleviate Starch-Induced Hyperglycemia in Prediabetic and Diabetic Mice.

Abstract Source:

Planta Med. 2020 Jul ;86(11):790-799. Epub 2020 May 25. PMID: 32450572

Abstract Author(s):

István Takács, András Szekeres, Ákos Takács, Dávid Rakk, Miklós Mézes, Ágnes Polyák, Lóránt Lakatos, Gyöngyi Gyémánt, Dezső Csupor, Krisztina J Kovács, Szilamér Ferenczi

Article Affiliation:

István Takács

Abstract:

Intestinal-glucosidase and-amylase break down nutritional poly- and oligosaccharides to monosaccharides and their activity significantly contributes to postprandial hyperglycemia. Competitive inhibitors of these enzymes, such as acarbose, are effective antidiabetic drugs, but have unpleasant side effects. In our ethnopharmacology inspired investigations, we found that wild strawberry (), blackberry (), and European blueberry () leaf extracts inhibit-glucosidase and-amylase enzyme activityand are effective in preventing postprandial hyperglycemia. Toxicology tests on H9c2 rat embryonic cardiac muscle cells demonstrated that berry leaf extracts have no cytotoxic effects. Oral administration of these leaf extracts alone or as a mixture to normal (control), obese, prediabetic, and streptozotocin-induced diabetic mice attenuated the starch-induced rise of blood glucose levels. The efficiency was similar to that of acarbose on blood glucose. These results highlight berry leaf extracts as candidates for testing in clinical trials in order to assess the clinical significance of their effects on glycemic control.

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