Baker Erin L, Dennis Robert G, Larkin Lisa M
Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109-2007, USA.
In Vitro Cell Dev Biol Anim. 2003 Nov-Dec;39(10):434-9. doi: 10.1290/1543-706X(2003)039<0434:GTCAGU>2.0.CO;2.
Engineered muscle may eventually be used as a treatment option for patients suffering from loss of muscle function. The metabolic and contractile function of engineered muscle has not been well described; therefore, the purpose of this experiment was to study glucose transporter content and glucose uptake in engineered skeletal muscle constructs called myooids. Glucose uptake by way of 2-deoxyglucose and GLUT-1 and GLUT-4 transporter protein content was measured in basal and insulin-stimulated myooids that were engineered from soleus muscles of female Sprague-Dawley rats. There was a significant increase in the basal 2-deoxyglucose uptake of myooids compared with adult control (fivefold), contraction-stimulated (3.4-fold), and insulin-stimulated (threefold) soleus muscles (P = 0.0001, 0.0001, and 0.0001, respectively). In addition, there was a significant increase in the insulin-stimulated 2-deoxyglucose uptake of myooids compared with adult control soleus muscles in basal conditions (6.5-fold) and adult contraction-stimulated (4.5-fold) and insulin- stimulated (3.9-fold) soleus muscles (P = 0.0001, 0.0001, and 0.0001, respectively). There was a significant 30% increase in insulin-stimulated compared with basal 2-deoxyglucose uptake in the myooids. The myooid GLUT-1 protein content was 820% of the adult control soleus muscle, whereas the GLUT-4 protein content was 130% of the control soleus muscle. Myooid GLUT-1 protein content was 6.3-fold greater than GLUT-4 protein content, suggesting that the glucose transport of the engineered myooids is similar in several respects to that observed in both fetal and denervated skeletal muscle tissue.
工程化肌肉最终可能会被用作治疗肌肉功能丧失患者的一种选择。工程化肌肉的代谢和收缩功能尚未得到充分描述;因此,本实验的目的是研究在称为肌样体的工程化骨骼肌构建物中的葡萄糖转运蛋白含量和葡萄糖摄取情况。在由雌性Sprague-Dawley大鼠的比目鱼肌构建的基础状态和胰岛素刺激的肌样体中,通过2-脱氧葡萄糖以及GLUT-1和GLUT-4转运蛋白含量来测量葡萄糖摄取。与成年对照(五倍)、收缩刺激(3.4倍)和胰岛素刺激(三倍)的比目鱼肌相比,肌样体的基础2-脱氧葡萄糖摄取量显著增加(分别为P = 0.0001、0.0001和0.0001)。此外,与基础状态下的成年对照比目鱼肌(6.5倍)、成年收缩刺激(4.5倍)和胰岛素刺激(3.9倍)的比目鱼肌相比,肌样体的胰岛素刺激的2-脱氧葡萄糖摄取量也显著增加(分别为P = 0.0001、0.0001和0.0001)。与基础状态相比,肌样体中胰岛素刺激的2-脱氧葡萄糖摄取量显著增加了30%。肌样体的GLUT-1蛋白含量是成年对照比目鱼肌的820%,而GLUT-4蛋白含量是对照比目鱼肌的130%。肌样体的GLUT-1蛋白含量比GLUT-4蛋白含量高6.3倍,这表明工程化肌样体的葡萄糖转运在几个方面与胎儿和失神经支配的骨骼肌组织中观察到的情况相似。