Hepatic mechanisms of the Walnut antidiabetic effect in mice

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Abstract

The present study was designed to explore the mechanism of action of walnut (the seed of Juglans regia) leaf and ridge on hepatic glucose metabolism in diabetic mice. Experimental diabetes was induced by intravenous administration of streptozotocin (60 mg/kg) and confirmed with an increase of blood glucose, 90-100% of the control, 72 hours later. Isolated extracts from walnut leaf and ridges were administered in a single effective dose of 400 mg/kg orally. Firstly, blood glucose was determined every 1 hour until 5 hours post administration of extracts. In the second experiment, the liver was surgically removed, 2 hours post treatment of diabetic animals with extracts, homogenized and used for measurement of key enzymes of glycogenolysis (glycogen phosphorylase, GP) and gluconeogenesis (phosphoenolpyruvate carboxykinase, PEPCK). Treatment by both leaf and ridge extracts decreased blood glucose and liver PEPCK activity and increased blood insulin and liver GP activity. It is concluded that walnut is able to lower blood glucose through inhibition of hepatic gluconeogenesis and secretion of pancreatic insulin. © 2010 Versita Warsaw and Springer-Verlag Wien.

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APA

Kamyab, H., Hejrati, S., Khanavi, M., Malihi, F., Mohammadirad, A., Baeeri, M., … Abdollahi, M. (2010). Hepatic mechanisms of the Walnut antidiabetic effect in mice. Central European Journal of Biology, 5(3), 304–309. https://doi.org/10.2478/s11535-010-0019-z

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