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Mechanistic insights into the effects of quercetin and/or GLP-1 analogue liraglutide on high-fat diet/streptozotocin-induced type 2 diabetes in rats
Update time:2017-09-18 23:35:49   【 Font: Large  Medium Small

Abstract

Background

The development of complementary treatment strategies that focuses on achieving a balance between adaptive and apoptotic unfolded protein response (UPR), enhancing endoplasmic reticulum (ER) homeostasis, and thus preserving β cell mass and function is particularly warranted.

Aim

This study was designed to investigate the effectiveness of the combined treatment by Quercetin (QUE) and Liraglutide (LIRA) in modulating hyperglycemia, insulin-insensitivity, UPR/ER stress markers, apoptosis, oxidative stress and inflammation using a high-fat diet/streptozotocin −induced type 2 diabetic rat model.

Methods

Sixty male albino rats were allocated into five equal groups: normal control, diabetic control, LIRA treated diabetic; QUE treated diabetic and combined treatment diabetic groups. Fasting glucose, insulin, CHOP, macrophage inflammatory protein −1 α (MIP-1α) and Bax, Bcl2 levels were estimated by ELISA; mRNA expression levels of the spliced X-box binding protein 1 (XBP1) were estimated using quantitative real-time RT-PCR, while MDA, advanced oxidation protein products, reduced glutathione levels and protein disulfide isomerase (PDI) activity were evaluated spectrophotometrically. Pancreatic tissues were also subjected to histopathological examination.

Results

The combined treatment with both LIRA and QUE causes significant improvements in all the studied parameters; including XBP1 splicing, CHOP, MIP-1α, Bax/Bcl2 ratio, PDI activity, as well as oxidative stress markers as compared to either treatment alone. It also attenuated pancreatic histopathological damage.

In conclusion

Our study nominates this combination to be used in T2DM to achieve adequate glycaemic control and to preserve optimal β cell function.

Cited products
Source:Biomedicine & Pharmacotherapy      by H H. Gaballah, S S. Zakaria, S E. Mwafy, et al.
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