title: Effects of glucose metabolism during in vitro maturation on cytoplasmic maturation of mouse oocytes.
abstract: Although there are many reports on the effect of glucose metabolism on oocyte nuclear maturation, there are few studies on its effect on ooplasmic maturation. By manipulating glucose metabolism pathways using a maturation medium that could support oocyte nuclear maturation but only a limited blastocyst formation without glucose, this study determined effects of glucose metabolism pathways on ooplasmic maturation. During maturation of cumulus-oocyte-complexes (COCs) with glucose, the presence of PPP inhibitor, DHEA or glycolysis inhibitor, iodoacetate significantly decreased blastocyst rates, intraoocyte glutathione and ATP. While blastocyst rates, GSH/GSSG ratio and NADPH were higher, ROS was lower significantly in COCs matured with iodoacetate than with DHEA. Fructose-6-phosphate overcame the inhibitory effect of DHEA on PPP. During maturation of COCs with pyruvate, electron transport inhibitor, rotenone or monocarboxylate transfer inhibitor, 4-CIN significantly decreased blastocyst rates. Cumulus-denuded oocytes had a limited capacity to use glucose or lactate, but they could use pyruvate to support maturation. In conclusion, whereas glycolysis promoted ooplasmic maturation mainly by supplying energy, PPP facilitated ooplasmic maturation to a greater extent by both reducing oxidative stress and supplying energy through providing fructose-6-phosphate for glycolysis. Pyruvate was transferred by monocarboxylate transporters and utilized through mitochondrial electron transport to sustain ooplasmic maturation.
authors: College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai-an City 271018, P. R. China.
authors: Hong-Li
authors: HL
authors: Xie
authors: College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai-an City 271018, P. R. China.
authors: Yan-Bo
authors: YB
authors: Wang
authors: College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai-an City 271018, P. R. China.
authors: Guang-Zhong
authors: GZ
authors: Jiao
authors: College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai-an City 271018, P. R. China.
authors: De-Ling
authors: DL
authors: Kong
authors: College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai-an City 271018, P. R. China.
authors: Qing
authors: Q
authors: Li
authors: College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai-an City 271018, P. R. China.
authors: Hong
authors: H
authors: Li
authors: College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai-an City 271018, P. R. China.
authors: Liang-Liang
authors: LL
authors: Zheng
authors: College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai-an City 271018, P. R. China.
authors: Jing-He
authors: JH
authors: Tan
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D018920:Coculture Techniques; D054885:Cumulus Cells / Q000166:cytology / Q000378:metabolism*; D003593:Cytoplasm / Q000378:metabolism*; D005260:Female; D005947:Glucose / Q000378:metabolism*; D051379:Mice; D009865:Oocytes / Q000166:cytology / Q000378:metabolism*
chemical_list: D005947:Glucose