Flow Cytometric Chromosomal Sex Sorting of Stallion Spermatozoa Induces Oxidative Stress on Mitochondria and Genomic DNA

Funding Agencies|Ministerio de Economia y Competitividad-FEDER in Madrid, Spain [AGL2013-43211-R]; Gobierno de Extremadura-FEDER [GR 10010, PCE1002]
To date, the only repeatable method to select spermatozoa for chromosomal sex is the Beltsville sorting technology using flow cytometry. Improvement of this technology in the equine species requires increasing awareness of the modifications that the sorting procedure induces on sperm intactness. Oxidative stress is regarded as the major damaging phenomenon, and increasing evidence regards handling of spermatozoa - including sex sorting - as basic ground for oxidative damage. The aim of this study was to disclose whether the flow cytometric sorting procedure increases the production of reactive oxygen species (ROS), and to identify if ROS production relates to DNA damage in sorted spermatozoa using specific flow cytometry-based assays. After sorting, oxidative stress increased from 26% to 33% in pre-and post-incubation controls, to 46% after sex sorting (p < 0.05). Proportions of DNA fragmentation index post-sorting were approximately 10% higher (31.3%); an effect apparently conduced via oxidative DNA damage as revealed by the oxyDNA assay. The probable origin of this increased oxidative stress owes the removal of enough seminal plasma due to the unphysiological sperm extension, alongside a deleterious effect of high pressure on mitochondria during the sorting procedure.

Ortega-Ferrusola, C.Vet Teaching Hospital, Spain (författare)
Morrell, JaneSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för kliniska vetenskaper (KV),Department of Clinical Sciences,Swedish University of Agriculture Science, Sweden(Swepub:slu)50646 (författare)
Rodriguez-Martinez, HeribertoLinköpings universitet,Avdelningen för kliniska vetenskaper,Medicinska fakulteten(Swepub:liu)herro55 (författare)
Pena, F. J.Vet Teaching Hospital, Spain (författare)
Vet Teaching Hospital, SpainInstitutionen för kliniska vetenskaper (KV) (creator_code:org_t)
Sveriges lantbruksuniversitet

Ingår i:Reproduction in domestic animals: WILEY-BLACKWELL51:1, s. 18-250936-67681439-0531

Av författaren/redakt...: Balao da Silva, ...; Ortega-Ferrusola ...; Morrell, Jane; Rodriguez-Martin ...; Pena, F. J.

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