2. Academic Validation
  3. Deficiency of peroxiredoxin 6 or inhibition of its phospholipase A2 activity impair the in vitro sperm fertilizing competence in mice

Deficiency of peroxiredoxin 6 or inhibition of its phospholipase A2 activity impair the in vitro sperm fertilizing competence in mice

  • Sci Rep. 2017 Oct 11;7(1):12994. doi: 10.1038/s41598-017-13411-2.
Adel R Moawad 1 2 3,  Maria C Fernandez 1 2,  Eleonora Scarlata 1 2,  Chandra Dodia 4 5,  Sheldon I Feinstein 4 5,  Aron B Fisher 4 5,  Cristian O'Flaherty 6 7 8
Affiliations

Affiliations

  • 1 The Research Institute of the McGill University Health Centre, McGill University, Montréal, Québec, Canada.
  • 2 Departments of Surgery (Urology Division), McGill University, Montréal, Québec, Canada.
  • 3 Department of Theriogenology Faculty of Veterinary Medicine, Cairo University, Giza, Egypt.
  • 4 Institute for Environmental Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
  • 5 Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
  • 6 The Research Institute of the McGill University Health Centre, McGill University, Montréal, Québec, Canada. cristian.oflaherty@mcgill.ca.
  • 7 Departments of Surgery (Urology Division), McGill University, Montréal, Québec, Canada. cristian.oflaherty@mcgill.ca.
  • 8 Pharmacology and Therapeutics, McGill University, Montréal, Québec, Canada. cristian.oflaherty@mcgill.ca.
PMID: 29021631 DOI: 10.1038/s41598-017-13411-2
Abstract

Prdx6 -/- male mice are subfertile, and the deficiency or inactivation of Peroxiredoxins (PRDXs) is associated with human male infertility. We elucidate the impact of the lack of PRDX6 or inhibition of its calcium-independent Phospholipase A2 (CA2+-iPLA2) activity by MJ33 on fertilization competence of mouse spermatozoa. Sperm motility, viability, fertilization and blastocyst rates were lower in Prdx6 -/- spermatozoa than in C57BL/6J wild-type (WT) controls (p ≤ 0.05). MJ33 inhibited the PRDX6 CA2+-iPLA2 activity and reduced these parameters in WT spermatozoa compared with controls (p ≤ 0.05). Levels of lipid peroxidation and of superoxide anion (O2•─) were higher in Prdx6 -/- than in WT spermatozoa (p ≤ 0.05). MJ33 increased the levels of lipid peroxidation and mitochondrial O2•─ production in treated versus non-treated WT spermatozoa. Acrosome reaction, binding to zona pellucida and fusion with the oolemma were lower in Prdx6 -/- capacitated spermatozoa than WT capacitated controls and lower in WT spermatozoa treated with the PRDX6 inhibitor. In conclusion, the inhibition of the PRDX6 CA2+-iPLA2 activity promotes an oxidative stress affecting viability, motility, and the ability of mouse spermatozoa to fertilize oocytes. Thus, PRDX6 has a critical role in the protection of the mouse spermatozoon against oxidative stress to assure fertilizing competence.

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