Acute fasting decreases the expression of GLUT1 and glucose utilisation involved in mouse oocyte maturation and cumulus cell expansion.
Acute fasting impairs meiotic resumption and glucose consumption in mouse cumulus cell and oocyte complexes (COCs). This study examines the effects of acute fasting on the regulation of glucose transporter 1 (GLUT1) expression and glucose consumption in oocyte maturation. Our results indicate that the restriction of glucose utilisation by 2-deoxyglucose (2-DG) mimicked the inhibitory effects of acute fasting on oocyte meiotic resumption and cumulus cell expansion, effects that were rescued by high glucose concentrations in the culture medium. GLUT1 protein levels were higher in cumulus cells compared with oocytes, and GLUT1 expression in COCs increased with FSH treatment in vitro. However, under acute fasting conditions, GLUT1 expression in COCs decreased and the response to FSH disappeared. Exposure to high glucose conditions (27.5mM and 55mM), significantly increased both glucose consumption and GLUT1 levels in COCs. Inhibition of GLUT1 function using an anti-GLUT1 antibody significantly inhibited FSH-induced oocyte meiotic resumption. Taken together, these results suggest that acute fasting decreases GLUT1 expression and glucose utilisation, inhibiting the processes of oocyte maturation and cumulus cell expansion.
State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100093, People's Republic of China.
Yingying
Y
Han
Jun
J
Yan
Jinlian
J
Zhou
Zhen
Z
Teng
Fenghua
F
Bian
Meng
M
Guo
Guankun
G
Mao
Junxia
J
Li
Jianwei
J
Wang
Meijia
M
Zhang
Guoliang
G
Xia
D000818:Animals; D049109:Cell Proliferation; D002478:Cells, Cultured; D054885:Cumulus Cells / Q000378:metabolism / Q000502:physiology*; D015536:Down-Regulation; D005215:Fasting / Q000378:metabolism / Q000502:physiology*; D005260:Female; D005947:Glucose / Q000378:metabolism*; D051272:Glucose Transporter Type 1 / Q000235:genetics* / Q000378:metabolism; D059471:In Vitro Oocyte Maturation Techniques; D051379:Mice; D009865:Oocytes / Q000378:metabolism*; D009866:Oogenesis / Q000235:genetics / Q000502:physiology; D013997:Time Factors
D051272:Glucose Transporter Type 1; C495678:Slc2a1 protein, mouse; D005947:Glucose