Effects of first exogenous nutrients on the mRNA levels of atrogin-1/MAFbx and GLUT1 in the skeletal muscles of newly hatched chicks

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• 作者：Daichi Ijiri^a ; ¹ ; ^{ijiri@chem.agri.kagoshima-u.ac.jp} ; Saki Shimamoto^a ; ¹ ; Mana Kawaguchi^a ; Airi Furukawa^a ; Kazuki Nakashima^b ; Osamu Tada^c ; Akira Ohtsuka^a
• 关键词：GLUT ; glucose transporter ; MAFbx ; muscle atrophy F-box ; Ub ; ubiquitin ; MeHis ; 3-methylhistidine
• 刊名：Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：205
• 期：Complete
• 页码：8-14
• 全文大小：636 K
• 卷排序：205

文摘

The aim of this study was to examine the effects of first exogenous nutrients on the mRNA levels of muscle atrophy F-box (atrogin-1/MAFbx) and glucose transporters (GLUTs) in the skeletal muscles of newly hatched chicks with no feed experience. In experiment 1, newly hatched chicks had free access to feed or were fasted for the first 24 h. The chicks having free access to feed for the first 24 h increased their body weight and had decreased atrogin-1/MAFbx mRNA levels in their sartorius and pectoralis major muscles compared with the fasted chicks. In experiment 2, newly hatched chicks received a single feed via intubation into the crop. Three hours after intubation, levels of atrogin-1/MAFbx mRNA in the sartorius muscle were decreased whereas the plasma insulin concentration and phosphorylated AKT levels in the sartorius muscle were increased. In addition, the mRNA levels of GLUT1 and GLUT8 were increased in the sartorius muscle after the intubation. However, in the pectoralis major muscle, AKT phosphorylation and levels of atrogin-1/MAFbx, GLUT1 and GLUT8 mRNA were not affected 3 h after intubation. The first exogenous nutrients increased the level of phosphorylated AKT in the sartorius muscle of newly hatched chicks, possibly because of the decrease in atrogin-1/MAFbx mRNA levels. Furthermore, the sartorius muscle in newly hatched chicks appeared to be more susceptible to the first feed compared with the pectoralis major muscle.