title: Metabolism, protein content, and in vitro embryonic development of goat cumulus-oocyte complexes matured with physiological concentrations of glucose and L-lactate.
abstract: No information is available concerning how the maturation environment controls the metabolism of goat oocytes. The objectives of this experiment were to: (1) Determine the concentrations of glucose, lactate, and pyruvate in caprine follicular fluid; and (2) Investigate the effects of physiological concentrations of glucose and lactate in the in vitro maturation (IVM) medium on the metabolism (glycolysis and pyruvate oxidation), protein content, and developmental competence of caprine oocytes and cumulus-oocyte complexes (COCs). Abattoir-derived COCs were matured for 18-20 hr in a defined, SOF-based medium containing 0.75, 1.5 (follicular fluid = 1.4 mM), or 3.0 mM glucose, and 3.0, 6.0 (follicular fluid = 7.1 mM), or 12.0 mM L-lactate. The protein content of oocytes and COCs was not affected (P > 0.05) by the concentration of glucose and lactate in the maturation medium. Increasing glucose and lactate decreased (P < or = 0.05) glycolytic activity of oocytes, without affecting (P > 0.05) pyruvate oxidation. In COCs, increasing glucose concentrations tended (P = 0.07) to decrease glycolysis. When metabolic activity was corrected for protein content (pmol/microg protein/3 hr), increasing glucose or lactate concentrations in the medium decreased (P < or = 0.05) pyruvate oxidation in oocytes, but increased (P < or = 0.05) pyruvate oxidation in COCs. Embryonic development (cleavage and blastocyst development, hatching, and cell number) was not affected (P > 0.05) by the glucose and lactate concentrations tested. These results indicate that concentrations of glucose and lactate in the medium have cell type-specific effects on metabolism of oocytes and COCs, but do not affect developmental competence within the range of concentrations tested.
authors.affiliation: Department of Animal Sciences, Program of Comparative Medicine, Purdue University, West Lafayette, IN 47907-2054, USA.
authors.forename: Jason R
authors.initials: JR
authors.lastname: Herrick
authors.forename: Michelle
authors.initials: M
authors.lastname: Lane
authors.forename: David K
authors.initials: DK
authors.lastname: Gardner
authors.forename: Esmail
authors.initials: E
authors.lastname: Behboodi
authors.forename: Erdogan
authors.initials: E
authors.lastname: Memili
authors.forename: Stephen
authors.initials: S
authors.lastname: Blash
authors.forename: Yann
authors.initials: Y
authors.lastname: Echelard
authors.forename: Rebecca L
authors.initials: RL
authors.lastname: Krisher
mesh_terms: D000818:Animals; D047108:Embryonic Development / Q000187:drug effects*; D005260:Female; D005307:Fertilization in Vitro; D015571:Follicular Fluid / Q000737:chemistry / Q000502:physiology; D005947:Glucose / Q000378:metabolism / Q000494:pharmacology*; D006041:Goats / Q000196:embryology*; D066298:In Vitro Techniques; D019344:Lactic Acid / Q000494:pharmacology*; D009865:Oocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D011506:Proteins / Q000032:analysis* / Q000378:metabolism; D019289:Pyruvic Acid / Q000378:metabolism
chemical_list: D011506:Proteins; D019344:Lactic Acid; D019289:Pyruvic Acid; D005947:Glucose