Mechanisms of oxidative stress in porcine oocytes and the role of anti-oxidants
B. D. Whitaker A B and J. W. Knight A
+ Author Affiliations
- Author Affiliations
A Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA 24061, USA.
B Corresponding author. Email: bwhitaker@ferrum.edu
Reproduction, Fertility and Development 20(6) 694-702 https://doi.org/10.1071/RD08037
Submitted: 2 March 2008 Accepted: 26 May 2008 Published: 9 July 2008
Abstract
The mechanisms of oxidative stress in in vitro maturing porcine oocytes and the effects of anti-oxidant supplementation of the medium in ameliorating these effects were investigated in the present study. In addition to intracellular reduced glutathione (GSH) concentrations and DNA fragmentation, the present study focused on superoxide dismutase (SOD), glutathione peroxidase (GPx) and catalase activity. The anti-oxidants used were N-acetylcysteine (NAC) and its derivative NAC-amide (NACA). The results indicate that when SOD is inhibited, supplementation of the maturarion medium with 1.5 mm NAC or NACA compensates for the decrease in SOD activity by reducing the degree of DNA fragmentation (P < 0.05). When GPx is inhibited, supplementation of the maturarion medium with 1.5 mm NAC alleviates the effects of no GPx activity, as indicated by a decrease in the degree of DNA fragmentation (P < 0.05). When the maturarion medium was supplemented with 1.5 mm NACA, intracellular GSH concentrations decreased (P < 0.05) and SOD and catalase activities increased (P < 0.05) along with the degree of DNA fragmentation. These results indicate that the mechanisms of alleviating oxidative stress in porcine oocytes are very complex and supplementing maturing oocytes with anti-oxidants may enhance enzyme activities and eliminate free radicals.
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