首页> 外文期刊>American Journal of Physiology >Glucose uptake and glycogen levels are increased in pig heart after repetitive ischemia.
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Glucose uptake and glycogen levels are increased in pig heart after repetitive ischemia.

机译:反复缺血后,猪心脏中的葡萄糖摄取和糖原水平增加。

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Repetitive myocardial ischemia increases glucose uptake, but the effect on glycogen is unclear. Thirteen swine instrumented with a hydraulic occluder on the circumflex (Cx) artery underwent 10-min occlusions twice per day for 4 days. After 24 h postfinal ischemia and in the fasted state, echocardiogram and positron emission tomography imaging for blood flow ([(13)N]-ammonia) and 2-[(18)F]fluoro-2-deoxy-D-glucose (FDG) uptake were obtained. Tissue was then collected for ATP, creatine phosphate (CP), glycogen, and glucose transporter-4 content, and hexokinase activity. After reperfusion, regional function and CP-to-ATP ratios in the Cx and remote regions were similar. Despite the absence of stunning, the Cx region demonstrated higher glycogen levels (33 +/- 11 vs. 24 +/- 11 micromol/g; P < 0.05), and this increase correlated well with the increase in FDG uptake (r(2) = 0.78; P < 0.01). Hexokinase activity was also increased relative to remote regions (0.62 +/- 0.29 vs. 0.37 +/- 0.19 IU/g; P < 0.05), withno difference in GLUT-4 content. In summary, 24 h after repetitive ischemia, glucose uptake and glycogen levels are increased at a time that functional and bioenergetic markers of stunning have recovered. The significant correlation between glycogen content and FDG accumulation in the postischemic region suggests that increased rates of glucose transport and/or phosphorylation are linked to increased glycogen levels in hearts subjected to repetitive bouts of ischemia.
机译:重复性心肌缺血可增加葡萄糖摄取,但对糖原的作用尚不清楚。十三只猪在回旋动脉(Cx)上用液压阻塞器进行了每天两次10分钟的咬合,共4天。最终缺血24小时后,在禁食状态下,超声心动图和正电子发射断层显像对血流([[(13)N]-氨)和2-[((18)F]氟-2-脱氧-D-葡萄糖(FDG) )的摄取。然后收集组织中的ATP,磷酸肌酸(CP),糖原和葡萄糖转运蛋白4含量以及己糖激酶活性。再灌注后,Cx和偏远地区的区域功能和CP-ATP比率相似。尽管没有令人惊叹的情况,但Cx区域显示出更高的糖原水平(33 +/- 11 vs.24 +/- 11 micromol / g; P <0.05),并且这种增加与FDG摄取的增加有很好的相关性(r(2 )= 0.78; P <0.01)。己糖激酶活性相对于偏远地区也有所增加(0.62 +/- 0.29相对于0.37 +/- 0.19 IU / g; P <0.05),而GLUT-4含量没有差异。总之,在重复性缺血24小时后,在击晕的功能和生物能标记恢复后,葡萄糖摄取和糖原水平增加。糖原含量与缺血后区域中FDG积累之间的显着相关性表明,在反复缺血性发作的心脏中,葡萄糖转运和/或磷酸化的速率增加与糖原水平升高有关。

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