Stadlbauer Verena, Haselgrübler Renate, Lanzerstorfer Peter, Plochberger Birgit, Borgmann Daniela, Jacak Jaroslaw, Winkler Stephan M, Schröder Klaus, Höglinger Otmar, Weghuber Julian
University of Applied Sciences Upper Austria, Wels, Austria.
University of Applied Sciences Upper Austria, Linz, Austria.
PLoS One. 2016 Jan 28;11(1):e0148109. doi: 10.1371/journal.pone.0148109. eCollection 2016.
Induction of GLUT4 translocation in the absence of insulin is considered a key concept to decrease elevated blood glucose levels in diabetics. Due to the lack of pharmaceuticals that specifically increase the uptake of glucose from the blood circuit, application of natural compounds might be an alternative strategy. However, the effects and mechanisms of action remain unknown for many of those substances. For this study we investigated extracts prepared from seven different plants, which have been reported to exhibit anti-diabetic effects, for their GLUT4 translocation inducing properties. Quantitation of GLUT4 translocation was determined by total internal reflection fluorescence (TIRF) microscopy in insulin sensitive CHO-K1 cells and adipocytes. Two extracts prepared from purslane (Portulaca oleracea) and tindora (Coccinia grandis) were found to induce GLUT4 translocation, accompanied by an increase of intracellular glucose concentrations. Our results indicate that the PI3K pathway is mainly responsible for the respective translocation process. Atomic force microscopy was used to prove complete plasma membrane insertion. Furthermore, this approach suggested a compound mediated distribution of GLUT4 molecules in the plasma membrane similar to insulin stimulated conditions. Utilizing a fluorescent actin marker, TIRF measurements indicated an impact of purslane and tindora on actin remodeling as observed in insulin treated cells. Finally, in-ovo experiments suggested a significant reduction of blood glucose levels under tindora and purslane treated conditions in a living organism. In conclusion, this study confirms the anti-diabetic properties of tindora and purslane, which stimulate GLUT4 translocation in an insulin-like manner.
在无胰岛素情况下诱导葡萄糖转运蛋白4(GLUT4)易位被认为是降低糖尿病患者血糖水平升高的关键概念。由于缺乏专门增加血液中葡萄糖摄取的药物,应用天然化合物可能是一种替代策略。然而,许多此类物质的作用效果和作用机制仍不清楚。在本研究中,我们调查了七种不同植物制备的提取物,这些植物据报道具有抗糖尿病作用,研究它们诱导GLUT4易位的特性。通过全内反射荧光(TIRF)显微镜在胰岛素敏感的中国仓鼠卵巢细胞(CHO-K1)和脂肪细胞中定量GLUT4易位。发现从马齿苋(Portulaca oleracea)和栝楼叶马交儿(Coccinia grandis)制备的两种提取物可诱导GLUT4易位,并伴有细胞内葡萄糖浓度升高。我们的结果表明,磷脂酰肌醇-3激酶(PI3K)途径主要负责各自的易位过程。使用原子力显微镜证明GLUT4完全插入质膜。此外,该方法表明化合物介导的GLUT4分子在质膜中的分布类似于胰岛素刺激的情况。利用荧光肌动蛋白标记物,TIRF测量表明马齿苋和栝楼叶马交儿对肌动蛋白重塑有影响,这与胰岛素处理的细胞中观察到的情况一致。最后,卵内实验表明,在栝楼叶马交儿和马齿苋处理条件下,活生物体中的血糖水平显著降低。总之,本研究证实了栝楼叶马交儿和马齿苋的抗糖尿病特性,它们以胰岛素样方式刺激GLUT4易位。
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