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Chemical denervation using botulinum toxin increases Akt expression and reduces submaximal insulin-stimulated glucose transport in mouse muscle

机译:使用肉毒杆菌毒素的化学质脱增加了Akt表达并减少了小鼠肌肉中的潜血症胰岛素刺激的葡萄糖输送

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Botulinum toxin A (botox) is a toxin used for spasticity treatment and cosmetic purposes. Botox blocks the excitation of skeletal muscle fibers by preventing the release of acetylcholine from motor nerves, a process termed chemical denervation. Surgical denervation is associated with increased expression of the canonical insulin-activated kinase Akt, lower expression of glucose handling proteins GLUT4 and hexokinase II (HKII) and insulin resistant glucose uptake, but it is not known if botox has a similar effect. To test this, we performed a time-course study using supra-maximal insulin-stimulation in mouse soleus ex vivo. No effect was observed in the glucose transport responsiveness at day 1, 7 and 21 after intramuscular botox injection, despite lower expression of GLUT4, HKII and expression and phosphorylation of TBC1D4. Akt protein expression and phosphorylation of the upstream kinase Akt were increased by botox treatment at day 21. In a follow-up study, botox decreased submaximal insulin-stimulated glucose transport. The marked alterations of insulin signaling, GLUT4 and HKII and submaximal insulin-stimulated glucose transport are a potential concern with botox treatment which merit further investigation in human muscle. Furthermore, the botox-induced chemical denervation model may be a less invasive alternative to surgical denervation.
机译:肉毒杆菌毒素A(Botox)是用于痉挛处理和化妆品目的的毒素。肉毒杆菌通过防止来自电动机神经的乙酰胆碱的释放来阻断骨骼肌纤维的激发,该方法称为化学质子。外科医疗学与典型胰岛素活化激酶Akt的表达增加有关,葡萄糖处理蛋白的低表达和六酮酶II(HKII)和胰岛素抗性葡萄糖摄取,但如果肉毒杆菌毒素具有类似的效果,则不知道。为了测试这一点,我们在小鼠Soleus exvivo中使用了Supra最大胰岛素刺激进行了时间课程研究。尽管Glut4,HKII和TBC1D4的表达和磷酸化表达降低,但在第1,7和第7天,第7天和第21天在第1,7和21天,葡萄糖传输反应性没有任何效果。在第21天通过肉毒杆菌治疗增加了上游激酶Akt的Akt蛋白表达和磷酸化。在后续研究中,Botox降低了潜水酸胰岛素刺激的葡萄糖转运。胰岛素信号传导,Glut4和HKII和潜血胰岛素刺激的葡萄糖转运的显着改变是肉毒杆菌治疗的潜在担忧,其在人体肌肉中进一步调查。此外,肉毒杆菌毒素诱导的化学质子化模型可能是手术剥削的较小侵入替代品。

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