title: Relationship of sperm small heat-shock protein 10 and voltage-dependent anion channel 2 with semen freezability in boars.
abstract: Freezability differences between boar ejaculates exist, but there is no useful method to predict the ejaculate freezability before sperm cryopreservation takes place. In this context, the present study sought to determine whether the amounts of small heat-shock protein 10 (also known as outer dense fiber protein 1) (ODF1/HSPB10) and voltage-dependent anion channel 2 (VDAC2) may be used as boar sperm freezability markers. With this aim, 26 boar ejaculates were split into two fractions: one for protein extraction and the other for cryopreservation purposes. Ejaculates were subsequently classified into two groups (good freezability ejaculates [GFE] and poor freezability ejaculates [PFE]) based on viability and sperm motility assessments after 30 and 240 minutes of after thawing. Although the VDAC2 amounts, analyzed through Western blot, were significantly higher (P < 0.01) in GFE (1.15 ± 0.18 density mm(2)) than in PFE (0.16 ± 0.03 density mm(2)), no significant differences were observed in ODF1/HSPB10 between both groups (i.e., 1.97 ± 0.38 density mm(2) in GFE vs. 1.87 ± 1.54 density mm(2) in PFE). In addition, principal component and multiple regression analyses indicated that the component explaining most of the variance (78.41%) in ejaculate freezability at 240 minutes after thawing resulted to be significantly (P < 0.05) correlated with VDAC2 content. This result revealed that the amounts of VDAC2 but not those of ODF1/HSPB10 may be used to predict the freezability of a given boar ejaculate before starting cryopreservation procedures.
authors.affiliation: Biotechnology of Animal and Human Reproduction (TechnoSperm), Department of Biology, Institute of Food and Agricultural Technology, University of Girona, Girona, Spain. Electronic address: ingrid.vilagran@udg.edu.
authors.forename: Ingrid
authors.initials: I
authors.lastname: Vilagran
authors.affiliation: Unit of Animal Reproduction, Department of Animal Medicine and Surgery, Faculty of Veterinary Medicine, Autonomous University of Barcelona, Bellaterra (Barcelona), Spain.
authors.forename: Marc
authors.initials: M
authors.lastname: Yeste
authors.affiliation: Biotechnology of Animal and Human Reproduction (TechnoSperm), Department of Biology, Institute of Food and Agricultural Technology, University of Girona, Girona, Spain.
authors.forename: Sílvia
authors.initials: S
authors.lastname: Sancho
authors.affiliation: Andrology Laboratory, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania, USA.
authors.forename: Isabel
authors.initials: I
authors.lastname: Casas
authors.affiliation: Unit of Animal Reproduction, Department of Animal Medicine and Surgery, Faculty of Veterinary Medicine, Autonomous University of Barcelona, Bellaterra (Barcelona), Spain.
authors.forename: Maria M
authors.initials: MM
authors.lastname: Rivera del Álamo
authors.affiliation: Biotechnology of Animal and Human Reproduction (TechnoSperm), Department of Biology, Institute of Food and Agricultural Technology, University of Girona, Girona, Spain.
authors.forename: Sergi
authors.initials: S
authors.lastname: Bonet
mesh_terms: D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D018835:Chaperonin 10 / Q000235:genetics / Q000378:metabolism*; D015925:Cryopreservation / Q000379:methods / Q000662:veterinary*; D050888:Heat-Shock Proteins, Small / Q000235:genetics / Q000378:metabolism*; D008297:Male; D012044:Regression Analysis; D012662:Semen Preservation / Q000379:methods / Q000662:veterinary*; D013081:Sperm Motility; D013094:Spermatozoa / Q000502:physiology*; D013552:Swine / Q000502:physiology*; D050996:Voltage-Dependent Anion Channel 2 / Q000235:genetics / Q000378:metabolism*
chemical_list: D015415:Biomarkers; D018835:Chaperonin 10; D050888:Heat-Shock Proteins, Small; D050996:Voltage-Dependent Anion Channel 2
keywords: Boar sperm; Cryopreservation; Freezability marker; ODF1/HSPB10; VDAC2