Egg yolk-free cryopreservation of bull semen


Autoři: Muhammad Anzar aff001;  Kosala Rajapaksha aff001;  Lyle Boswall aff001
Působiště autorů: Agriculture and Agri-Food Canada, Saskatoon Research and Development Center, Saskatoon, Saskatchewan, Canada aff001;  Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada aff002
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0223977

Souhrn

Egg yolk is a common ingredient of mammalian semen extender to protect sperm against initial cold shock. However, egg yolk has biosecurity risks. Our main objectives were to cryopreserve bull semen without egg yolk using exogenous cholesterol and to study the protective role of glycerol in egg yolk-free semen extender. Other objectives were to compare protein profiles and in vitro fertilization potential of bull sperm frozen with and without egg yolk. In first experiment, semen was either diluted in conventional tris-egg yolk glycerol (TEYG control) extender or first treated with cholesterol-cyclodextrin complex (CC, 2 mg/ml semen) followed by dilution in egg yolk-free tris-glycerol (TG) extender (collectively called as “CC+TG”) at 22°C or 4°C, and frozen. Post-thaw sperm motion characteristics were similar between CC+TG and TEYG control extenders, and temperature of glycerol addition. In second experiment, semen was frozen in CC+TG extender varying in glycerol concentration (7 to 0%; v/v). Post-thaw sperm quality decreased with the decline in glycerol concentration in TG extender, even higher concentration of CC complex (3 or 4 mg/ml semen) could not protect sperm in the absence of glycerol in TG extender. In third experiment, SDS electrophoresis of proteins from fresh sperm and sperm frozen in CC+TG, and TEYG control extenders was conducted. Protein profiles in fresh sperm and CC+TG frozen sperm were almost similar. Egg yolk proteins bound tightly with sperm plasma membrane. In fourth experiment, in vitro fertilization potentials of sperm frozen in TEYG control and CC+TG extenders were tested. Cleavage and blastocyst rates of semen frozen in CC+TG and TEYG control extenders were similar. In conclusion, cholesterol-cyclodextrin replaced egg yolk from the semen extender; glycerol remained essential for egg yolk-free sperm cryopreservation; and CC+TG extender did not modify sperm plasma membrane CC+TG whereas egg yolk extender changed the plasma membrane composition of bull sperm.

Klíčová slova:

Cell membranes – Cholesterol – Membrane proteins – Semen – Sperm – Glycerolization – Cryopreservation – Acrosomes


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