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Masuda Y, Kheawkanha T, Nagahama A, Kawasaki K, Konno T, Yamanaka K, Tatemoto H. Antifreeze protein type III addition to freezing extender comprehensively improves post-thaw sperm properties in Okinawan native Agu pig. Anim Reprod Sci 2023; 252:107232. [PMID: 37075564 DOI: 10.1016/j.anireprosci.2023.107232] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 03/28/2023] [Accepted: 04/12/2023] [Indexed: 04/21/2023]
Abstract
Sperm cryopreservation often leads to physical cell damage through ice crystal formation. This study evaluates the improvements to freezing extender cryoprotective activity due to antifreeze protein (AFP) addition, which primarily acts on ice crystal formation, through investigating the post-thaw sperm properties of Okinawan native Agu pig. Six individual boar sperm samples were diluted with the freezing extender supplemented with 1 μg/mL of AFP I or AFP III and then subjected to cryopreservation. Treatment with AFP I during the freezing procedure had no improvement for any characteristics after thawing compared to untreated sperm. In contrast, the addition of AFP III to the freezing extender strongly increased sperm motility, mitochondria and cell membrane integrity, and the acrosomal proteolytic activity of frozen-thawed sperm in 5 of 6 individuals (P < 0.05). Furthermore, cryoinjury prevention by AFP III significantly enhanced sperm viability (by ATP content), and maintained DNA quality and in vitro sperm penetrability compared with AFP I treatment (P < 0.05). These findings demonstrate that AFP III addition to the freezing extender of boar sperm is more effective in maintaining sperm characteristics than the extender without AFP III or AFP I, despite individual differences in response.
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Affiliation(s)
- Yusuke Masuda
- Faculty of Agriculture, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
| | - Theerapat Kheawkanha
- Faculty of Agriculture, Khon Kaen University, Muang Khon Kaen District, Khon Kaen 40002, Thailand
| | - Ayari Nagahama
- Faculty of Agriculture, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
| | - Kokoro Kawasaki
- Faculty of Agriculture, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
| | - Toshihiro Konno
- Faculty of Agriculture, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
| | - Kenichi Yamanaka
- Faculty of Agriculture, Saga University, Saga city, Saga 840-8502, Japan
| | - Hideki Tatemoto
- Faculty of Agriculture, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan.
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2
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Addition of l-carnitine to the freezing extender improves post-thaw sperm quality of Okinawan native Agu pig. Theriogenology 2021; 188:170-176. [PMID: 35031142 DOI: 10.1016/j.theriogenology.2021.12.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 12/20/2021] [Accepted: 12/26/2021] [Indexed: 11/23/2022]
Abstract
The objective of the present study was to establish whether the addition of l-carnitine (LC), which exhibits antioxidant activity, to the freezing extender improves the quality of cryopreserved Okinawan native Agu pig sperm. Ejaculated sperm frozen in an extender supplemented with 0, 1, 2.5, or 5 mM LC was thawed, and the integrities of mitochondria and the plasmalemma and other sperm characteristics were evaluated. The treatment with different concentrations of LC effectively improved sperm motility, mitochondrial and plasmalemmal integrities, and the proteolytic activity of acrosomal contents after freeze-thawing (P < 0.05). The proportion of post-thaw sperm possessing intact mitochondria and plasmalemma and higher proteolytic activity of acrosomal contents was markedly higher among sperm frozen in the presence of 2.5 mM LC than among sperm frozen in the extender without LC (P < 0.05). Furthermore, although the addition of LC to the freezing extender had no effect on disturbance of DNA damage and caspase activity, sperm treated with 2.5 mM LC during freezing exhibited significantly higher penetrability into matured oocytes in vitro than untreated sperm. Collectively, these results indicate that the addition of LC to the freezing extender effectively improved the post-thaw quality of Agu pig sperm by preventing mitochondrial dysfunction caused by oxidative stress during cryopreservation.
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3
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Ribas-Maynou J, Mateo-Otero Y, Delgado-Bermúdez A, Bucci D, Tamanini C, Yeste M, Barranco I. Role of exogenous antioxidants on the performance and function of pig sperm after preservation in liquid and frozen states: A systematic review. Theriogenology 2021; 173:279-294. [PMID: 34411905 DOI: 10.1016/j.theriogenology.2021.07.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 07/05/2021] [Accepted: 07/06/2021] [Indexed: 11/26/2022]
Abstract
In situations where an excessive generation of reactive oxygen species overwhelms antioxidant capacity, a harmful effect on sperm function is exerted. Antioxidants are molecules capable of minimizing this detrimental effect, which is important in pig sperm due to the high content of polyunsaturated fatty acids in their plasma membrane. The present systematic review aims at evaluating whether supplementing semen extenders (for liquid storage at 17 °C) or freezing and/or thawing media (for cryopreservation) with antioxidants influences sperm quality and functionality parameters, and in vitro/in vivo fertility outcomes. We defined inclusion and exclusion criteria in a PICOS table according to PRISMA guidelines, and conducted a literature search through MEDLINE-PubMed in November 2020. After systematic selection, 75 studies were included: 47 focused on cryopreservation and 28 on liquid storage at 17 °C. More than 70% of the studies included in this review showed that adding semen extenders for liquid storage and/or freezing/thawing media for cryopreservation with antioxidants enhances sperm quality and functionality parameters. In addition, this supplementation improves in vivo/in vitro fertility outcomes, supporting the hypothesis that the beneficial effect observed upon sperm quality has a positive impact on reproduction outcomes.
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Affiliation(s)
- Jordi Ribas-Maynou
- Biotechnology of Animal and Human Reproduction (TechnoSperm), Institute of Food and Agricultural Technology, University of Girona, Girona, Spain; Unit of Cell Biology, Department of Biology, Faculty of Sciences, University of Girona, Girona, Spain.
| | - Yentel Mateo-Otero
- Biotechnology of Animal and Human Reproduction (TechnoSperm), Institute of Food and Agricultural Technology, University of Girona, Girona, Spain; Unit of Cell Biology, Department of Biology, Faculty of Sciences, University of Girona, Girona, Spain
| | - Ariadna Delgado-Bermúdez
- Biotechnology of Animal and Human Reproduction (TechnoSperm), Institute of Food and Agricultural Technology, University of Girona, Girona, Spain; Unit of Cell Biology, Department of Biology, Faculty of Sciences, University of Girona, Girona, Spain
| | - Diego Bucci
- Department of Veterinary Medical Sciences, University of Bologna, Bologna, Italy
| | - Carlo Tamanini
- Department of Veterinary Medical Sciences, University of Bologna, Bologna, Italy
| | - Marc Yeste
- Biotechnology of Animal and Human Reproduction (TechnoSperm), Institute of Food and Agricultural Technology, University of Girona, Girona, Spain; Unit of Cell Biology, Department of Biology, Faculty of Sciences, University of Girona, Girona, Spain
| | - Isabel Barranco
- Department of Veterinary Medical Sciences, University of Bologna, Bologna, Italy.
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4
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Basioura A, Tsousis G, Boscos CM, Tsakmakidis IA. Efficiency of three boar sperm enrichment techniques. Reprod Domest Anim 2021; 56:1148-1151. [PMID: 34170587 DOI: 10.1111/rda.13976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 06/15/2021] [Indexed: 11/26/2022]
Abstract
The objective of the study was to investigate the efficiency of three enrichment methods to separate boar spermatozoa. Twenty-four ejaculates from 12 boars (2 ejaculates/boar) were extended (30 × 106 spermatozoa/mL) in commercial Beltsville Thawing Solution. Each semen sample was processed with glass wool column (GW) and glass beads (GB) filtration and with the single-layer centrifugation (SLC) technique. Semen samples before (control; C) and after treatment were evaluated for sperm CASA motility/kinetics and concentration, viability, morphology and chromatin integrity. Data were analysed with mixed models. The concentration of total and motile spermatozoa was significantly decreased after treatment in groups GW and SLC, but not in group GB. Group GW showed increased values of WOB compared with both groups C and GB. Group GB showed greater values of rapid movement spermatozoa and lower values of slow movement spermatozoa compared with group C. In group SLC, higher values of VSL, LIN and STR were observed compared with group C. In conclusion, all techniques under examination enhanced various CASA variables. Based on our results, the GB method is a promising alternative separation technique for boar sperm and deserves further research regarding swine in vitro fertilization.
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Affiliation(s)
- Athina Basioura
- Unit of Biotechnology of Reproduction, Farm Animals Clinic, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Georgios Tsousis
- Unit of Biotechnology of Reproduction, Farm Animals Clinic, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Constantin M Boscos
- Unit of Biotechnology of Reproduction, Farm Animals Clinic, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Ioannis A Tsakmakidis
- Unit of Biotechnology of Reproduction, Farm Animals Clinic, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
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5
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Santonastaso M, Mottola F, Iovine C, Colacurci N, Rocco L. Protective Effects of Curcumin on the Outcome of Cryopreservation in Human Sperm. Reprod Sci 2021; 28:2895-2905. [PMID: 33861392 PMCID: PMC8523395 DOI: 10.1007/s43032-021-00572-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 04/02/2021] [Indexed: 02/07/2023]
Abstract
Cryopreservation causes decreased sperm fertility potential due to reactive oxygen species (ROS) production and physical-chemical damage, resulting in reduced sperm viability and motility. The addition of antioxidants to freezing media could protect sperm from cryo-damage, counteracting the harmful effects of ROS. The aim of this study was to assess the effects of curcumin supplementation in freezing medium on preventing cryo-damage in human semen. Semen samples collected from fertile men were cryopreserved in freezing medium supplemented with different concentrations of curcumin (2.5, 5, 10, and 20 μM). After freezing-thawing, sperm parameters, DNA fragmentation, intracellular ROS, and glutathione peroxidase 4 (GPX4) gene expression were evaluated. Supplementation with 20 μM curcumin in freezing medium caused increases in progressive and nonprogressive motility and significant reductions in intracellular ROS and DNA fragmentation in frozen-thawed sperm cells. Following cryopreservation, GPX4 mRNA expression was significantly upregulated in thawed semen supplemented with 20 μM curcumin compared to the control. The results showed that curcumin supplementation in freezing medium was protective against human sperm parameters and sperm DNA, counteracting oxidative damage induced by the freeze-thaw process.
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Affiliation(s)
- Marianna Santonastaso
- Department of Woman, Child and General and Special Surgery, University of Campania "Luigi Vanvitelli", Napoli, Italy
| | - Filomena Mottola
- Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania "Luigi Vanvitelli", Caserta, Italy
| | - Concetta Iovine
- Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania "Luigi Vanvitelli", Caserta, Italy
| | - Nicola Colacurci
- Department of Woman, Child and General and Special Surgery, University of Campania "Luigi Vanvitelli", Napoli, Italy
| | - Lucia Rocco
- Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania "Luigi Vanvitelli", Caserta, Italy.
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6
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Pezo F, Yeste M, Zambrano F, Uribe P, Risopatrón J, Sánchez R. Antioxidants and their effect on the oxidative/nitrosative stress of frozen-thawed boar sperm. Cryobiology 2020; 98:5-11. [PMID: 33248047 DOI: 10.1016/j.cryobiol.2020.11.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Revised: 11/10/2020] [Accepted: 11/22/2020] [Indexed: 02/07/2023]
Abstract
In swine, the use of frozen-thawed boar sperm for artificial insemination remains a suboptimal reproductive technology. Among the negative effects of cryopreservation on sperm cells, it is worth highlighting that cryopreservation causes irreversible alterations in motility and components of the sperm membrane as a result of dramatic changes in temperature (cooling/freezing curve) and osmolality. In addition, freeze-thawing may induce oxidative stress and increase the generation of reactive oxygen species (ROS) and nitrogen reactive species (RNS). While boar sperm cryopreservation has been reported to increase lipid peroxidation and the intracellular levels of hydrogen peroxide, less research on its impact on RNS has been conducted. Furthermore, previous studies have investigated the effects of supplementing cryopreservation media with antioxidants to counteract the deleterious effects of ROS and RNS. Antioxidants of synthetic origin or natural extracts have been used, with some showing noticeable and positive effects on functional sperm parameters both in vitro and in vivo. The aim of this review is to provide an update on the effect of different molecules with antioxidant capacity on the function of cryopreserved boar sperm.
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Affiliation(s)
- Felipe Pezo
- Laboratory of Reproductive Medicine and Molecular Endocrinology, Center for Translational Medicine (CEMT-BIOREN), Universidad de La Frontera, Temuco, Chile; Escuela de Medicina Veterinaria, Facultad de Recursos Naturales y Medicina Veterinaria, Universidad Santo Tomas, Chile
| | - Marc Yeste
- Biotechnology of Animal and Human Reproduction (TechnoSperm), Unit of Cell Biology, Department of Biology, Institute of Food and Agricultural Technology, Faculty of Sciences, University of Girona, Girona, Spain
| | - Fabiola Zambrano
- Laboratory of Reproductive Medicine and Molecular Endocrinology, Center for Translational Medicine (CEMT-BIOREN), Universidad de La Frontera, Temuco, Chile; Department of Preclinical Sciences, Faculty of Medicine, Universidad de La Frontera, Temuco, Chile
| | - Pamela Uribe
- Laboratory of Reproductive Medicine and Molecular Endocrinology, Center for Translational Medicine (CEMT-BIOREN), Universidad de La Frontera, Temuco, Chile; Department of Internal Medicine, Faculty of Medicine, Universidad de La Frontera, Temuco, Chile
| | - Jennie Risopatrón
- Department of Preclinical Sciences, Faculty of Medicine, Universidad de La Frontera, Temuco, Chile
| | - Raúl Sánchez
- Laboratory of Reproductive Medicine and Molecular Endocrinology, Center for Translational Medicine (CEMT-BIOREN), Universidad de La Frontera, Temuco, Chile; Department of Preclinical Sciences, Faculty of Medicine, Universidad de La Frontera, Temuco, Chile.
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7
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Rabelo SS, Resende CO, Pontelo TP, Chaves BR, Pereira BA, da Silva WE, Peixoto JV, Pereira LJ, Zangeronimo MG. Chlorogenic acid improves the quality of boar semen processed in Percoll. Anim Reprod 2020; 17:e20190021. [PMID: 32368276 PMCID: PMC7189441 DOI: 10.21451/1984-3143-ar2019-0021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
This study aimed to evaluate if the addition of chlorogenic acid (ChA) to semen extenders improves the quality of cooled boar semen processed in Percoll. The experimental design was randomized blocks (ejaculates) in a 2×3 factorial (with or without Percoll, and three antioxidant systems: a negative control, without supplementation, a positive control – vitamin E, and ChA), totaling six treatments and 12 repetitions. ChA and vitamin E (VE) were added at 4.5 mg/ml and 400 μg/ml in extender, respectively. At 0, 48 and 72h of storage at 15ºC, 80 ml insemination doses each containing 2.0 billion sperm cells were submitted to centrifugation in Percoll. The use of Percoll impaired (P<0.01) all motility patterns but decreased (P<0.01) the number of abnormal cells at 0, 48 and 72h of storage. Both VE and ChA improved (P<0.05) the total motility after Percoll processing, but only in semen stored for 48h. The same effect was not observed (P>0.05) in semen stored for 72h. ChA improved (P<0.05) the total motility of the semen stored for 72h, but this effect was not observed (P>0.05) when the semen was processed in Percoll. The antioxidants had no effect (P>0.05) on the viability and integrity of the acrosome, but ChA reduced (P<0.05) the number of abnormal cells at 0h, while VE increased the number of abnormal cells in semen stored for 72h, independent of the use of Percoll. There was no effect (P>0.05) of antioxidants or Percoll on the concentration of malondialdehyde in seminal plasma. The use of Percoll had no effect (P>0.05) on the cholesterol efflux, but ChA increased (P<0.05) this parameter at 0h and reduced (P<0.05) in the semen stored for 72h not processed with Percoll. In conclusion, the addition of ChA to semen extenders improved the quality of boar semen processed or not in Percoll.
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Affiliation(s)
- Stenia Severo Rabelo
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, MG, Brasil
| | - Carla Oliveira Resende
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, MG, Brasil
| | - Thais Preisser Pontelo
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, MG, Brasil
| | - Bruna Resende Chaves
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, MG, Brasil
| | | | | | - Juliano Vogas Peixoto
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, MG, Brasil
| | - Luciano José Pereira
- Departamento de Ciências da Saúde, Universidade Federal de Lavras, Lavras, MG, Brasil
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Adami LNG, de Lima BT, Andretta RR, Bertolla RP, Nichi M. Carnosine treatment during human semen processing by discontinuous density gradient. Andrologia 2019; 52:e13497. [PMID: 31793048 DOI: 10.1111/and.13497] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 10/23/2019] [Accepted: 11/06/2019] [Indexed: 02/06/2023] Open
Abstract
The aim of this article was to evaluate the effects of different concentrations of carnosine added during human semen processing. Semen samples from 34 patients were submitted to processing by discontinuous density gradient centrifugation without (control) or with different concentrations of carnosine supplementation as follows: (a) 20 mM of carnosine supplementation on the layers of Percoll; and (b) 50 mM carnosine supplementation. Sperm samples were then washed with human tubal fluid medium and evaluated according to sperm kinetics and functional assessment. For statistical analysis, data were evaluated by a general linear model or a Friedman test, whenever appropriate. The 50 mM carnosine supplementation led to improved sperm mitochondrial activity when compared to untreated samples. Motility variables, such as percentage of motile and progressively motile spermatozoa, average path velocity, straight line velocity, curvilinear velocity and linearity, showed an improvement after semen processing irrespective of carnosine supplementation. Both concentrations of carnosine increased the beat-cross frequency (BCF) when compared to samples before processing. We conclude that carnosine supplementation in semen samples benefits sperm mitochondrial activity and BCF.
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Affiliation(s)
- Luana Nayara Gallego Adami
- Department of Surgery, Division of Urology, Human Reproduction Section, Universidade Federal de São Paulo, Sao Paulo, Brazil
| | - Bruna Tuani de Lima
- Department of Surgery, Division of Urology, Human Reproduction Section, Universidade Federal de São Paulo, Sao Paulo, Brazil
| | - Rhayza Roberta Andretta
- Department of Surgery, Division of Urology, Human Reproduction Section, Universidade Federal de São Paulo, Sao Paulo, Brazil
| | - Ricardo Pimenta Bertolla
- Department of Surgery, Division of Urology, Human Reproduction Section, Universidade Federal de São Paulo, Sao Paulo, Brazil
| | - Marcilio Nichi
- Department of Surgery, Division of Urology, Human Reproduction Section, Universidade Federal de São Paulo, Sao Paulo, Brazil
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Yang C, Xu L, Cui Y, Wu B, Liao Z. Potent humanin analogue (HNG) protects human sperm from freeze-thaw-induced damage. Cryobiology 2019; 88:47-53. [DOI: 10.1016/j.cryobiol.2019.04.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 03/06/2019] [Accepted: 04/02/2019] [Indexed: 01/18/2023]
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10
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Macente BI, Gutierrez RR, Apparício M, Balieiro CDC, Mansano CFM, Pereira MM, Borges-Silva JC, Pires-Buttler EA, Galvão ALB, Toniollo GH, Luvoni GC, Morselli MG, Vicente WRR. Cat epididymal semen cryopreserved with and without vitamin E: effect on sperm parameters and lipid peroxidation. Anim Reprod 2018; 15:1193-1198. [PMID: 34221131 PMCID: PMC8203110 DOI: 10.21451/1984-3143-ar2018-0001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
The aims of this study were to investigate: 1) if the addition of α-tocopherol (vitamin
E) in three concentrations (0.3, 0.6 and 0.9 mM) is able to preserve spermatozoa integrity
after thawing and 2) the effect of α-tocopherol supplementation on lipid peroxidation.
Fifty four domestic cats were used in this study constituting 18 pools (3 cats per pool). Each
pool was submitted at four experimental groups: group 0 (control) – epididymal sperm
were frozen with a commercial Botucrio® extender; group 0.3, group 0.6
and group 0.9 – the extender was supplemented with 0.3, 0.6 and 0.9 mM of α-tocopherol,
respectively. Each semen sample was evaluated for motility, progressive forward motility,
morphology, sperm viability (plasma membrane integrity-PMI), hypo-osmotic swelling test
(HOST), before and after thawing. The evaluation of lipid peroxidation reaction by Thiobarbituric
Acid Reactive Substances (TBARS) test was performed on thawed semen only. Results demonstrated
that there was no significant difference between control and the three α-tocopherol
groups with regards to motility and progressive motility after thawing (P > 0.05). As expected,
in fresh samples viability was significantly higher than in all the cryopreserved groups
in which there was no positive influence of any of the α-tocopherol concentration
used. Lipid peroxidation was higher in the supplemented groups 0.6 and 0.9 mM of α-tocopherol
than in control and in 0.3 mM group. In conclusion, the addition of α-tocopherol to
the commercial extender had no positive influence on reduction of lipid peroxidation. This
topic deserves further investigations to better understand the effect of cryopreservation
procedures on epididymal spermatozoa and to establish adequate strategies to counteract
sperm cryodamages.
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Affiliation(s)
| | | | - Maricy Apparício
- Universidade Estadual Paulista (UNESP), Jaboticabal, São Paulo, Brazil
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Hezavehei M, Sharafi M, Kouchesfahani HM, Henkel R, Agarwal A, Esmaeili V, Shahverdi A. Sperm cryopreservation: A review on current molecular cryobiology and advanced approaches. Reprod Biomed Online 2018; 37:327-339. [PMID: 30143329 DOI: 10.1016/j.rbmo.2018.05.012] [Citation(s) in RCA: 194] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2017] [Revised: 05/19/2018] [Accepted: 05/22/2018] [Indexed: 11/19/2022]
Abstract
The cryopreservation of spermatozoa was introduced in the 1960s as a route to fertility preservation. Despite the extensive progress that has been made in this field, the biological and biochemical mechanisms involved in cryopreservation have not been thoroughly elucidated to date. Various factors during the freezing process, including sudden temperature changes, ice formation and osmotic stress, have been proposed as reasons for poor sperm quality post-thaw. Little is known regarding the new aspects of sperm cryobiology, such as epigenetic and proteomic modulation of sperm and trans-generational effects of sperm freezing. This article reviews recent reports on molecular and cellular modifications of spermatozoa during cryopreservation in order to collate the existing understanding in this field. The aim is to discuss current freezing techniques and novel strategies that have been developed for sperm protection against cryo-damage, as well as evaluating the probable effects of sperm freezing on offspring health.
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Affiliation(s)
- Maryam Hezavehei
- Department of EmbryologyReproductive Biomedicine Research CentreRoyan Institute for Reproductive BiomedicineACECRTehranIran; Department of Animal BiologyFaculty of Biological SciencesKharazmi UniversityTehranIran
| | - Mohsen Sharafi
- Department of Poultry ScienceFaculty of AgricultureTarbiat Modares UniversityTehranIran.
| | | | - Ralf Henkel
- American Centre for Reproductive MedicineCleveland ClinicClevelandUSA
| | - Ashok Agarwal
- Department of Medical BioscienceUniversity of the Western CapeBellvilleSouth Africa
| | - Vahid Esmaeili
- Department of EmbryologyReproductive Biomedicine Research CentreRoyan Institute for Reproductive BiomedicineACECRTehranIran
| | - Abdolhossein Shahverdi
- Department of EmbryologyReproductive Biomedicine Research CentreRoyan Institute for Reproductive BiomedicineACECRTehranIran.
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12
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Pei Y, Yang L, Wu L, He H, Geng G, Xu D, Chen H, Li Q. Combined effect of apigenin and ferulic acid on frozen-thawed boar sperm quality. Anim Sci J 2018; 89:956-965. [PMID: 29708294 DOI: 10.1111/asj.13009] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 02/28/2018] [Indexed: 01/23/2023]
Abstract
The main aim of the present study was to evaluate the cryoprotective effect of apigenin (AP) and ferulic acid (FA) on boar sperm during cryopreservation. AP and FA were both demonstrated to be high-efficiency antioxidants and had not previously been used to protect sperm from cryodamage. As boar sperm is sensitive to oxidative stress, suitable antioxidants are still needed for improving frozen-thawed sperm quality. With this purpose, semen samples coming from five boars were used in this study. Ejaculates of five boars were mixed and split into 16 aliquots, in which different doses of AP and FA were added separately or together. The motility, the plasma membrane integrity, the mitochondrial activity, the acrosomal integrity, the antioxidase activities and the malondialdehyde concentration of the frozen-thawed boar sperm were assessed. The results suggested that both AP and FA significantly improved the frozen-thawed boar sperm quality in all these aspects when they were added to the freezing extender separately, while the highest improvement was recorded when the extender was supplemented with 0.1 mmol/L AP plus 0.15 mmol/L FA. These findings demonstrated that supplementation of freezing extender with both AP and FA had a combined, beneficial effect on frozen-thawed boar sperm.
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Affiliation(s)
- Yifei Pei
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province, China
| | - Li Yang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province, China
| | - Lin Wu
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province, China
| | - Huanshan He
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province, China
| | - Guoxia Geng
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi Province, China
| | - Dejun Xu
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province, China
| | - Huali Chen
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province, China
| | - Qingwang Li
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province, China
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Satorre MM, Breininger E, Cetica PD, Córdoba M. Relation between respiratory activity and sperm parameters in boar spermatozoa cryopreserved with alpha-tocopherol and selected by Sephadex. Reprod Domest Anim 2018; 53:979-985. [DOI: 10.1111/rda.13197] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 03/27/2018] [Indexed: 11/28/2022]
Affiliation(s)
- MM Satorre
- Facultad de Ciencias Veterinarias; Instituto de Investigación y Tecnología en Reproducción Animal (INITRA); Universidad de Buenos Aires; Buenos Aires Argentina
- Facultad de Ciencias Veterinarias; Consejo Nacional de Investigaciones Científicas y Técnicas; Investigaciones en Producción Animal (INPA); Buenos Aires Argentina
| | - E Breininger
- Facultad de Ciencias Veterinarias; Instituto de Investigación y Tecnología en Reproducción Animal (INITRA); Universidad de Buenos Aires; Buenos Aires Argentina
- Facultad de Ciencias Veterinarias; Consejo Nacional de Investigaciones Científicas y Técnicas; Investigaciones en Producción Animal (INPA); Buenos Aires Argentina
| | - PD Cetica
- Facultad de Ciencias Veterinarias; Instituto de Investigación y Tecnología en Reproducción Animal (INITRA); Universidad de Buenos Aires; Buenos Aires Argentina
- Facultad de Ciencias Veterinarias; Consejo Nacional de Investigaciones Científicas y Técnicas; Investigaciones en Producción Animal (INPA); Buenos Aires Argentina
| | - M Córdoba
- Facultad de Ciencias Veterinarias; Instituto de Investigación y Tecnología en Reproducción Animal (INITRA); Universidad de Buenos Aires; Buenos Aires Argentina
- Facultad de Ciencias Veterinarias; Consejo Nacional de Investigaciones Científicas y Técnicas; Investigaciones en Producción Animal (INPA); Buenos Aires Argentina
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14
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Aitken RJ. Reactive oxygen species as mediators of sperm capacitation and pathological damage. Mol Reprod Dev 2017; 84:1039-1052. [PMID: 28749007 DOI: 10.1002/mrd.22871] [Citation(s) in RCA: 334] [Impact Index Per Article: 47.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 07/23/2017] [Indexed: 12/12/2022]
Abstract
Oxidative stress plays a major role in the life and death of mammalian spermatozoa. These gametes are professional generators of reactive oxygen species (ROS), which appear to derive from three potential sources: sperm mitochondria, cytosolic L-amino acid oxidases, and plasma membrane Nicotinamide adenine dinucleotide phosphate oxidases. The oxidative stress created via these sources appears to play a significant role in driving the physiological changes associated with sperm capacitation through the stimulation of a cyclic adenosine monophosphate/Protein kinase A phosphorylation cascade, including the activation of Extracellular signal regulated kinase-like proteins, massive up-regulation of tyrosine phosphorylation in the sperm tail, as well as the induction of sterol oxidation. When generated in excess, however, ROS can induce lipid peroxidation that, in turn, disrupts membrane characteristics that are critical for the maintenance of sperm function, including the capacity to fertilize an egg. Furthermore, the lipid aldehydes generated as a consequence of lipid peroxidation bind to proteins in the mitochondrial electron transport chain, triggering yet more ROS generation in a self-perpetuating cycle. The high levels of oxidative stress created as a result of this process ultimately damage the DNA in the sperm nucleus; indeed, DNA damage in the male germ line appears to be predominantly induced oxidatively, reflecting the vulnerability of these cells to such stress. Extensive evaluation of antioxidants that protect the spermatozoa against oxidative stress while permitting the normal reduction-oxidation regulation of sperm capacitation is therefore currently being undertaken, and has already proven efficacious in animal models.
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Affiliation(s)
- Robert J Aitken
- Discipline of Biological Sciences Priority Research Centre in Reproductive Science, The University of Newcastle, Callaghan, NSW, Australia
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15
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Yeste M, Rodríguez-Gil JE, Bonet S. Artificial insemination with frozen-thawed boar sperm. Mol Reprod Dev 2017; 84:802-813. [PMID: 28608609 DOI: 10.1002/mrd.22840] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Accepted: 05/25/2017] [Indexed: 11/11/2022]
Abstract
Artificial insemination with frozen-thawed semen in pigs is not a routine technique; its use is restricted to specific cases, such as preservation of valuable genetic material (germplasm banks), safety strategies in case of natural disasters, long-distance transport of sperm, and in combination with sex-sorting. Cryoinjuries resulting from freeze-thawing protocols are a major concern with regard to the fertilization capacity of the treated sperm, which is lower than that of liquid-stored semen. Here, we provide an overview of artificial insemination using cryopreserved sperm, and summarize the factors that influence cryopreservation success before, during, and after freeze-thaw (i.e., sperm selection before starting the cryopreservation process, holding time, use of cryoprotectants, and rates of freezing and thawing) and that are driving the identification of biomarkers to predict sensitivity to cryodamage. Three different artificial insemination techniques (conventional or intracervical; intrauterine; and deep intrauterine) are also discussed with regards to their relevance when using frozen-thawed semen. Finally, we review the use of additives to freezing and thawing media, given reports that they may maintain and improve the quality and fertilizing capacity of frozen-thawed sperm. In sum, artificial insemination with frozen-thawed boar sperm can provide reasonable fertility outcomes, if freezable ejaculates, specific additives, and appropriate insemination techniques are used.
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Affiliation(s)
- Marc Yeste
- Biotechnology of Animal and Human Reproduction (TechnoSperm), Unit of Cell Biology, Department of Biology, Institute of Food and Agricultural Technology, University of Girona, Girona, Spain
| | - Joan E Rodríguez-Gil
- Faculty of Veterinary Medicine, Unit of Animal Reproduction, Department of Animal Medicine and Surgery, Autonomous, University of Barcelona, Bellaterra (Cerdanyola del Vallès), Barcelona, Spain
| | - Sergi Bonet
- Biotechnology of Animal and Human Reproduction (TechnoSperm), Unit of Cell Biology, Department of Biology, Institute of Food and Agricultural Technology, University of Girona, Girona, Spain
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16
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Acosta IB, Junior ASV, E Silva EF, Cardoso TF, Caldas JS, Jardim RD, Corcini CD. Effects of exposure to cadmium in sperm cells of zebrafish, Danio rerio. Toxicol Rep 2016; 3:696-700. [PMID: 28959594 PMCID: PMC5616012 DOI: 10.1016/j.toxrep.2016.08.002] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 08/05/2016] [Accepted: 08/09/2016] [Indexed: 12/12/2022] Open
Abstract
Cadmium is a natural element found in the earth’s crust; it is usually associated with other metals, but due to the impacts caused by human activity, its concentration has increased in the aquatic environment. This metal may damage aquatic animal reproduction, decreasing the rate of fertilization of organisms such as fish. Thus, this study aimed to evaluate the in vitro toxicity of different concentrations of cadmium (0 (control), 0.5, 5, and 10 μg/L) using sperm cells of model organism zebrafish, Danio rerio. Structural parameters, including integrity and fluidity of the plasma membrane, concentration of oxygen species, mitochondrial function and DNA fragmentation were measured by flow cytometry. The following sperm movement parameters were also measured using the computer assisted sperm analysis (CASA) system: motility, time of motility, curvilinear velocity, average path velocity and straight line velocity in μm/s. Significant effects were observed on path speed, straight speed, curvilinear velocity, motility time, progressive and total motility, and plasma and DNA integrity. The results showed that cadmium can negatively affect some reproductive parameters in D. rerio, which may reduce the fertility rate of these animals.
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Affiliation(s)
- Izani Bonel Acosta
- Institute of Biological Sciences, Federal University of Rio Grande, Av. Italy 8 km, 96203-900 Rio Grande, RS, Brazil.,Post-Graduate Program in Physiological Sciences-Comparative Animal Physiology, Av 8 km Italy, 96203-900 Rio Grande, RS, Brazil
| | - Antonio Sergio Varela Junior
- Institute of Biological Sciences, Federal University of Rio Grande, Av. Italy 8 km, 96203-900 Rio Grande, RS, Brazil.,Post-Graduate Program in Aquatic Environments Continental Biology, Federal University of Rio Grande, Av. Italy 8.96203 to 900 km Rio Grande, RS, Brazil
| | - Estela Fernandes E Silva
- Institute of Biological Sciences, Federal University of Rio Grande, Av. Italy 8 km, 96203-900 Rio Grande, RS, Brazil.,Post-Graduate Program in Physiological Sciences-Comparative Animal Physiology, Av 8 km Italy, 96203-900 Rio Grande, RS, Brazil
| | - Tainã Figueiredo Cardoso
- Institute of Biological Sciences, Federal University of Rio Grande, Av. Italy 8 km, 96203-900 Rio Grande, RS, Brazil.,Post-Graduate Program in Physiological Sciences-Comparative Animal Physiology, Av 8 km Italy, 96203-900 Rio Grande, RS, Brazil
| | - Jôsie Schwartz Caldas
- Post-Graduate Program in Aquatic Environments Continental Biology, Federal University of Rio Grande, Av. Italy 8.96203 to 900 km Rio Grande, RS, Brazil
| | - Rodrigo Desessards Jardim
- Institute of Biological Sciences, Federal University of Rio Grande, Av. Italy 8 km, 96203-900 Rio Grande, RS, Brazil.,Post-Graduate Program in Physiological Sciences-Comparative Animal Physiology, Av 8 km Italy, 96203-900 Rio Grande, RS, Brazil
| | - Carine Dahl Corcini
- Post-Graduate Program in Physiological Sciences-Comparative Animal Physiology, Av 8 km Italy, 96203-900 Rio Grande, RS, Brazil.,Faculty of Veterinary Medicine, Federal University of Pelotas, University Campus, PO Box 354, 96001-970 Pelotas, Brazil
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17
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Yeste M. Recent Advances in Boar Sperm Cryopreservation: State of the Art and Current Perspectives. Reprod Domest Anim 2016; 50 Suppl 2:71-9. [PMID: 26174922 DOI: 10.1111/rda.12569] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Accepted: 06/05/2015] [Indexed: 01/04/2023]
Abstract
While sperm cryopreservation is the best technology to store boar semen for long-term periods, only 1% of all artificial inseminations (AI) conducted worldwide are made using frozen-thawed boar sperm. With the emergence of long-term extenders for liquid storage, the use of cryopreserved sperm in routine AI is less required. However, banks of boar semen contain cryopreserved sperm and planning inseminations in AI centres may benefit from the use of frozen-thawed semen. Therefore, there is an interest in the use of this technology to preserve boar sperm. In this regard, although the first attempts to cryopreserve boar semen date back to the seventies and this technology is still considered as optimal, some relevant improvements have been made in the last decade. After giving a general picture about boar sperm cryodamage, the present review seeks to shed light on these recent cryopreservation advances. These contributions regard to protein markers for predicting ejaculate freezability, sperm selection prior to start cryopreservation procedures, additives to freezing and thawing extenders, relevance of the AI-technique and insemination-to-ovulation interval. In conclusion, most of these progresses have allowed counteracting better boar sperm cryodamage and are thus considered as forward steps for this storage method. It is also worth noting that, despite being lower than fresh/extended semen, reproductive performance outcomes following AI with frozen-thawed boar sperm are currently acceptable.
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Affiliation(s)
- M Yeste
- Nuffield Department of Obstetrics and Gynaecology, Level 3, Women's Centre, John Radcliffe Hospital, University of Oxford, Headington, Oxford, UK
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Yeste M. Sperm cryopreservation update: Cryodamage, markers, and factors affecting the sperm freezability in pigs. Theriogenology 2015; 85:47-64. [PMID: 26506124 DOI: 10.1016/j.theriogenology.2015.09.047] [Citation(s) in RCA: 215] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 09/20/2015] [Accepted: 09/22/2015] [Indexed: 02/04/2023]
Abstract
Cryopreservation is the most efficient method for long-term preservation of mammalian sperm. However, freeze-thawing procedures may strongly impair the sperm function and survival and thus decrease the reproductive performance. In addition, the sperm resilience to withstand cryopreservation, also known as freezability, presents a high individual variability. The present work summarizes the principles of cryoinjury and the relevance of permeating and nonpermeating cryoprotective agents. Descriptions about sperm cryodamage are mainly focused on boar sperm, but reference to other mammalian species is also made when relevant. Main cryoinjuries not only regard to sperm motility and membrane integrity, but also to the degradation effect exerted by freeze-thawing on other important components for sperm fertilizing ability, such as mRNAs. After delving into the main differences between good and poor freezability boar ejaculates, those protein markers predicting the sperm ability to sustain cryopreservation are also mentioned. Moreover, factors that may influence sperm freezability, such as season, diet, breed, or ejaculate fractions are discussed, together with the effects of different additives, like seminal plasma and antioxidants. After briefly referring to the effects of long-term sperm preservation in frozen state and the reproductive performance of frozen-thawed boar sperm, this work speculates with new research horizons on the preservation of boar sperm, such as vitrification and freeze-drying.
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Affiliation(s)
- Marc Yeste
- Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Level 3, Women's Centre, John Radcliffe Hospital, Oxford, UK.
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19
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In vitro fertilization in pigs: New molecules and protocols to consider in the forthcoming years. Theriogenology 2015; 85:125-34. [PMID: 26271164 DOI: 10.1016/j.theriogenology.2015.07.017] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 07/08/2015] [Accepted: 07/12/2015] [Indexed: 12/22/2022]
Abstract
Assisted reproduction technology (ART) protocols are used in livestock for the improvement and preservation of their genetics and to enhance reproductive efficiency. In the case of pigs, the potential use of embryos for biomedicine is being followed with great interest by the scientific community. Owing to the physiological similarities with humans, embryos produced in vitro and many of those produced in vivo are used in research laboratories for the procurement of stem cells or the production of transgenic animals, sometimes with the purpose of using their organs for xenotransplantation. Several techniques are required for the production of an in vitro-derived embryo. These include in vitro oocyte maturation, sperm preparation, IVF, and further culture of the putative zygotes. Without doubt, among these technologies, IVF is still a critical limiting factor because of the well-known, but still unsolved, question of polyspermy. Despite the improvements made in the past decade, current IVF systems hardly reach 50% to 60% efficiency and any progression in porcine ARTs requires an unavoidable improvement in the monospermy rate. It is time, then, to learn from what happens under in vivo physiological conditions and to transfer this knowledge into ART. This review describes the latest advances in porcine IVF, from sperm preparation procedures to culture media supplements with special attention paid to molecules with a known or potential role in in vivo fertilization. Oviductal fluid is the natural medium in which fertilization takes place, and, in the near future, could become the definitive supplement for culture media, where it would help to solve many of the problems inherent in ARTs in swine and improve the quality of in vitro-derived porcine embryos.
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20
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Surai PF, Fisinin VI. Selenium in pig nutrition and reproduction: boars and semen quality-a review. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2015; 28:730-46. [PMID: 25924964 PMCID: PMC4413004 DOI: 10.5713/ajas.14.0593] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 10/14/2014] [Accepted: 11/23/2014] [Indexed: 01/01/2023]
Abstract
Selenium plays an important role in boar nutrition via participating in selenoprotein synthesis. It seems likely that selenoproteins are central for antioxidant system regulation in the body. Se-dependent enzyme glutathione peroxidase (GSH-Px) is the most studied selenoprotein in swine production. However, roles of other selenoproteins in boar semen production and maintenance of semen quality also need to be studied. Boar semen is characterised by a high proportion of easily oxidized long chain polyunsaturated fatty acids and requires an effective antioxidant defense. The requirement of swine for selenium varies depending on many environmental and other conditions and, in general, is considered to be 0.15 to 0.30 mg/kg feed. It seems likely that reproducing sows and boars are especially sensitive to Se deficiency, and meeting their requirements is an important challenge for pig nutritionists. In fact, in many countries there are legal limits as to how much Se may be included into the diet and this restricts flexibility in terms of addressing the Se needs of the developing and reproducing swine. The analysis of data of various boar trials with different Se sources indicates that in some cases when background Se levels were low, there were advantages of Se dietary supplementation. It is necessary to take into account that only an optimal Se status of animals is associated with the best antioxidant protection and could have positive effects on boar semen production and its quality. However, in many cases, background Se levels were not determined and therefore, it is difficult to judge if the basic diets were deficient in Se. It can also be suggested that, because of higher efficacy of assimilation from the diet, and possibilities of building Se reserves in the body, organic selenium in the form of selenomethionine (SeMet) provided by a range of products, including Se-Yeast and SeMet preparations is an important source of Se to better meet the needs of modern pig genotypes in commercial conditions of intensive pig production.
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Affiliation(s)
- Peter F Surai
- Department of Animal Nutrition, Faculty of Agricultural and Environmental Sciences, Szent Istvan University, Gödöllo H-2103, Hungary ; Department of Microbiology and Biochemistry, Faculty of Veterinary Medicine, Trakia University, Stara Zagora 6000, Bulgaria . ; Department of Veterinary Expertise and Microbiology, Faculty of Veterinary Medicine, Sumy National Agrarian University, Sumy, 40021, Ukraine . ; Odessa National Academy of Food Technologies, Odessa 65039, Ukraine
| | - Vladimir I Fisinin
- All-Russian Institute of Poultry Husbandry, Sergiev Posad, 141311, Russia
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21
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The Effect of Coenzyme Q10 and α-Tocopherol in Skim Milk–Based Extender for Preservation of Caspian Stallion Semen in Cool Condition. J Equine Vet Sci 2014. [DOI: 10.1016/j.jevs.2014.04.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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