In vitro versus cryo-induced capacitation of bovine spermatozoa, part 1: Structural, functional, and oxidative similarities and differences

PLoS One. 2022 Oct 21;17(10):e0276683. doi: 10.1371/journal.pone.0276683. eCollection 2022.

Abstract

Low temperatures during cryopreservation activate a cascade of changes, which may lead into irreversible damage and reduction of the fertilization potential, including the process of premature capacitation. The aim of our study was to evaluate the range of cell damage following the cryopreservation process and possible activation of cryocapacitation in bovine spermatozoa. For the experiments semen samples were obtained from 30 sexually mature Holstein bulls. Within the analysed parameters, we focused on the functional activity, structural integrity, capacitation status and oxidative profile. The samples were divided into three experimental groups, control (CTRL), in vitro capacitated (CAP) and cryopreserved (CRYO). Based on the collected data, there was a significant decrease in the sperm motility, mitochondrial membrane potential and concentration of cyclic adenosine monophosphate in the CRYO group when compared to CAP and CTRL (P<0.0001). A significant decrease (P<0.01; P<0.0001) in the membrane and acrosome integrity as well as DNA fragmentation index and a significant increase (P<0.0001) of necrotic cells were observed in the CRYO group. Following capacitation, a significant increase (P<0.01; P<0.0001) was recorded in the number of cells which underwent the acrosome reaction in the CRYO group against CAP and CTRL. Changes in the oxidative profile of the CRYO group indicates an increase (P<0.0001) in the reactive oxygen species generation, except for the superoxide radical, which was significantly higher (P<0.0001; P<0.001) in the CAP group in comparison with CRYO and CTRL. In summary, premature capacitation may be considered a consequence of cryopreservation and the assessed parameters could serve as physical markers of cryogenic damage to bovine spermatozoa in the future.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenosine Monophosphate / metabolism
  • Animals
  • Cattle
  • Cryopreservation / veterinary
  • Male
  • Oxidative Stress
  • Reactive Oxygen Species / metabolism
  • Semen Preservation* / veterinary
  • Sperm Capacitation / physiology
  • Sperm Motility / physiology
  • Spermatozoa / metabolism
  • Superoxides / metabolism

Substances

  • Superoxides
  • Reactive Oxygen Species
  • Adenosine Monophosphate

Grants and funding

N.L.: NUKLEUS 313011V387, Operational program Integrated Infrastructure within the project: Creation of nuclear herds of dairy cattle with a requirement for high health status through the use of genomic selection, innovative biotechnological methods, and optimal management of breeding, cofinanced by the European Regional Development fund. http://www.vyskumnaagentura.sk/images/karty/informacne-listy-projektov/NUKLEUS.pdfhttp://www.vyskumnaagentura.sk/sk/priklady-dobrej-praxe/informacne-listy-projektov/527-vyzva-na-podporu-dlhodobeho-strategickeho-vyskumu-zdrave-potraviny-a-zivotne-prostredie-kod-opvai-va-dp-2018-1-2-1-06http://www.vyskumnaagentura.sk/en/ N.L.: VEGA 1/0038/19, The Scientific Grant Agency of The Ministry of Education, Science, Research and Sport of the Slovak Republic. https://www.minedu.sk/vedecka-grantova-agentura-msvvas-sr-a-sav-vega/https://www.minedu.sk/about-the-ministry/ E.T.: APVV-15-0544, The Slovak Research and Development Agency. https://www.apvv.sk/?lang=en The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.