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Panda S, Saha A, Chauhan MS, Singla SK. Development of homologous hemizona assay as a potential predictor of fertility in buffalo bulls: a preliminary approach. Reprod Domest Anim 2022; 57:1336-1343. [PMID: 35862253 DOI: 10.1111/rda.14209] [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: 06/23/2022] [Accepted: 07/18/2022] [Indexed: 12/01/2022]
Abstract
Although, myriads of tests are routinely used, no single test can accurately predict fertilization potential of semen. The hemizona assay (HZA) has advantages in two ways: a) it determines multitude traits of sperm, b) it is a controlled sperm function test. In the present study, we developed homologous HZA in buffalo to predict bull fertility. In this experiment, bull with fertility rate 53.3% and 48.5% were used as control whereas bull with fertility rate 32.6% and 32.2% were used as test semen samples. For HZA, matching buffalo hemizonae were co-incubated with processed buffalo sperm for four hours. Number of sperm bound to the outer surface of hemizona was determined. No significant difference was observed in sperm binding for co-incubation of same bull sperm with matching hemizona (P<0.05). Significant difference in sperm binding to matching hemizona was seen while two halves were incubated with control and test semen respectively (P<0.05). Hemizona assay index (HZAI) of test bull semen has been determined from percentage of test-sperm bound to the matching hemizona in comparison to control-sperm. For finding relation, HZAI were correlated with respective fertility rates of semen samples and found that a significant positive correlation was present with r = 0.83, P<0.1. A regression equation of Y = 1.39 X - 55.8 (where Y = pregnancy rate of test semen sample and X = HZAI of test semen sample) was presented to predict fertility rates of unknown semen samples. Thus, hemizona assay can be used as a potential predictor of buffalo bull fertility.
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Affiliation(s)
- Santanu Panda
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, National Dairy Research Institute, Karnal, India.,Animal Resources Development Department, Government of West Bengal, Kolkata, India
| | - Ambikaprasanna Saha
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, National Dairy Research Institute, Karnal, India.,Dum Dum Motijheel College, Kolkata, India
| | - Manmohan Singh Chauhan
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, National Dairy Research Institute, Karnal, India
| | - Suresh Kumar Singla
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, National Dairy Research Institute, Karnal, India
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Live imaging-based assay for visualising species-specific interactions in gamete adhesion molecules. Sci Rep 2022; 12:9609. [PMID: 35688940 PMCID: PMC9187738 DOI: 10.1038/s41598-022-13547-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 05/25/2022] [Indexed: 11/08/2022] Open
Abstract
Successful gamete fusion requires species-specific membrane adhesion. However, the interaction of adhesion molecules in gametes is difficult to study in real time through low-throughput microscopic observation. Therefore, we developed a live imaging-based adhesion molecule (LIAM) assay to study gamete adhesion molecule interactions in cultured cells. First, we modified a fusion assay previously established for fusogens introduced into cultured cells, and confirmed that our live imaging technique could visualise cell-cell fusion in the modified fusion assay. Next, instead of fusogen, we introduced adhesion molecules including a mammalian gamete adhesion molecule pair, IZUMO1 and JUNO, and detected their temporal accumulation at the contact interfaces of adjacent cells. Accumulated IZUMO1 or JUNO was partly translocated to the opposite cells as discrete spots; the mutation in amino acids required for their interaction impaired accumulation and translocation. By using the LIAM assay, we investigated the species specificity of IZUMO1 and JUNO of mouse, human, hamster, and pig in all combinations. IZUMO1 and JUNO accumulation and translocation were observed in conspecific, and some interspecific, combinations, suggesting potentially interchangeable combinations of IZUMO1 and JUNO from different species.
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3
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Watanabe S. DNA damage in human sperm: The sperm chromosome assay. Reprod Med Biol 2022; 21:e12461. [PMID: 35475148 PMCID: PMC9020466 DOI: 10.1002/rmb2.12461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 04/04/2022] [Indexed: 11/06/2022] Open
Abstract
Background Sperm DNA damage is a major cause of pre‐ and post‐implantation embryonic loss in humans. However, the factors that control how and when such DNA damage occurs in human sperm are poorly understood. Methods Here, I review information relating to sperm DNA damage that can be obtained from the sperm chromosome assays described in the existing literature. Main findings The sperm chromosome assays, which consist of interspecific in vitro fertilization or intracytoplasmic sperm injection using murine oocytes and subsequent chromosome analysis, indicate that the proportion of sperm showing DNA damage is initially low and there are larger numbers of sperm with potential membrane and DNA damage that are induced after ejaculation and separation from the seminal plasma. Other assays that directly detect sperm DNA (e.g., TUNEL assays, Comet assays, and acridine orange test) are not able to distinguish and detect the initial and potential DNA damage. Furthermore, the positive values in these direct assays are influenced by the frequency of immotile sperm and amorphous sperm populations. Conclusion The findings in the sperm chromosome assays show that further improvements in sperm preparation protocols may result in the reduction of sperm DNA damage, followed by more successful outcomes in infertility treatment.
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Affiliation(s)
- Seiji Watanabe
- Department of Anatomical Science Hirosaki University Graduate School of Medicine Hirosaki Japan
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The Role of Sperm Proteins IZUMO1 and TMEM95 in Mammalian Fertilization: A Systematic Review. Int J Mol Sci 2022; 23:ijms23073929. [PMID: 35409288 PMCID: PMC8999778 DOI: 10.3390/ijms23073929] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 03/28/2022] [Accepted: 03/28/2022] [Indexed: 12/02/2022] Open
Abstract
Gamete membrane fusion is a critical cellular event in sexual reproduction. In addition, the generation of knockout models has provided a powerful tool for testing the functional relevance of proteins thought to be involved in mammalian fertilization, suggesting IZUMO1 and TMEM95 (transmembrane protein 95) as essential proteins. However, the molecular mechanisms underlying the process remain largely unknown. Therefore, the aim of this study was to summarize the current knowledge about IZUMO1 and TMEM95 during mammalian fertilization. Hence, three distinct databases were consulted—PubMed, Scopus and Web of Science—using single keywords. As a result, a total of 429 articles were identified. Based on both inclusion and exclusion criteria, the final number of articles included in this study was 103. The results showed that IZUMO1 is mostly studied in rodents whereas TMEM95 is studied primarily in bovines. Despite the research, the topological localization of IZUMO1 remains controversial. IZUMO1 may be involved in organizing or stabilizing a multiprotein complex essential for the membrane fusion in which TMEM95 could act as a fusogen due to its possible interaction with IZUMO1. Overall, the expression of these two proteins is not sufficient for sperm–oocyte fusion; therefore, other molecules must be involved in the membrane fusion process.
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Peres Campanholi S, Garcia Neto S, Basso AC, de Agostini Losano JD, Perez Siqueira AF, Nichi M, Ortiz D'Avila Assumpção ME, Afonso de Freitas L, Paro de Paz CC, Ferraudo AS, Morato Monteiro F, Unno Gimenes L. Estimate of in vitro embryo production based on sperm subpopulations in Senepol bulls. Theriogenology 2020; 161:98-107. [PMID: 33302167 DOI: 10.1016/j.theriogenology.2020.11.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 11/25/2020] [Accepted: 11/25/2020] [Indexed: 11/28/2022]
Abstract
In cattle, in vitro embryo production (IVEP) is an important reproductive biotechnology responsible for the rapid expansion of the Senepol breed in our country. This breed has shown important results when used in crossbreeding and estimate IVEP in Senepol based on seminal analysis would be valuable for the semen cryopreservation industry, research institutes and breeders. Combining the evaluation of sperm subpopulations with analysis of other sperm attributes may help to improve fertility predictions in cattle. Therefore, the objectives of the present study were to: 1) identify and characterize motile sperm subpopulations in cryopreserved Senepol semen following the washing process carried out before in vitro fertilization, and 2) to determine an model for estimate IVEP based on sperm subpopulations in conjunction with other sperm quality analyzes. Samples of 38 cryopreserved semen from 28 Senepol bulls, chosen based on retrospective data from 386 IVEP routines, underwent the semen washing and were evaluated by the computer-assisted sperm analysis system. Sperm morphology was evaluated by wet preparation technique, and plasma and acrosomal membranes integrity, mitochondrial potential, oxidative status and chromatin resistance were analyzed by flow cytometry. After multivariate analysis of principal components and grouping, three sperm subpopulations were identified: SBP1 (fast and progressive motility), SBP2 (hyperactivated motility) and SBP3 (slow non-progressive motility). After categorization of IVEP in high, medium and low embryo yield, logistic regression analysis was applied to associate the results of subpopulations and other sperm quality variables with IVEP. The SBP1 and SBP2 variables affected embryo production, and an IVEP estimation model was generated for Senepol bulls based on these two subpopulations: embryo yield = 0.1563 + 0.0328 (SBP1) + 0.0173 (SBP2). SBP1 and SBP2 represents the absolute value of the percentage of subpopulations in semen. If the calculated value (by this equation) is close to 1, the embryo yield will be low; if is close to 2, will be medium; if is close to 3, will be high. In conclusion, three subpopulations were found for Senepol semen and, despite all analyzed variables, only SBP1 and SBP2 were included in the model to estimate IVEP in this breed.
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Affiliation(s)
| | | | | | | | | | - Marcílio Nichi
- Universidade de São Paulo, FMVZ/USP, São Paulo, São Paulo, Brazil
| | | | | | | | | | - Fabio Morato Monteiro
- Centro Avançado de Pesquisa de Bovinos de Corte, APTA/IZ, Sertãozinho, São Paulo, Brazil
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Haddad M, Stewart J, Xie P, Cheung S, Trout A, Keating D, Parrella A, Lawrence S, Rosenwaks Z, Palermo GD. Thoughts on the popularity of ICSI. J Assist Reprod Genet 2020; 38:101-123. [PMID: 33155089 PMCID: PMC7823003 DOI: 10.1007/s10815-020-01987-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 10/18/2020] [Indexed: 12/17/2022] Open
Abstract
Purpose Intracytoplasmic sperm injection (ICSI) is the most widely utilized assisted reproductive technique (ART) worldwide. In this feature, we review the early assisted fertilization attempts that eventually led to the development of ICSI, and discuss its current utilization in cases of male and non-male factor infertility. Methods We researched the literature related to the development, indications, and current use of ICSI, such as sperm structural abnormalities, male genetic indications, surgically retrieved sperm, high sperm chromatin fragmentation, oocyte dysmorphism, and preimplantation genetic testing (PGT). We also describe the potential future applications of ICSI. Results This review summarizes the early micromanipulation techniques that led to the inception of ICSI. We also explore its current indications, including non-male factor infertility, where its use is more controversial. Finally, we consider the benefits of future advancements in reproductive biology that may incorporate ICSI, such as in vitro spermatogenesis, neogametogenesis, and heritable genome editing. Conclusion The versatility, consistency, and reliability of ICSI have made it the most prevalently utilized ART procedure worldwide.
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Affiliation(s)
- Mounia Haddad
- The Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Joshua Stewart
- The Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Philip Xie
- The Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Stephanie Cheung
- The Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Aysha Trout
- The Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Derek Keating
- The Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Alessandra Parrella
- The Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Sherina Lawrence
- The Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Zev Rosenwaks
- The Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Gianpiero D Palermo
- The Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine, Weill Cornell Medicine, New York, NY, USA.
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Bhakta HH, Refai FH, Avella MA. The molecular mechanisms mediating mammalian fertilization. Development 2019; 146:146/15/dev176966. [PMID: 31375552 DOI: 10.1242/dev.176966] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Fertilization is a key biological process in which the egg and sperm must recognize one another and fuse to form a zygote. Although the process is a continuum, mammalian fertilization has been studied as a sequence of steps: sperm bind and penetrate through the zona pellucida of the egg, adhere to the egg plasma membrane and finally fuse with the egg. Following fusion, effective blocks to polyspermy ensure monospermic fertilization. Here, we review how recent advances obtained using genetically modified mouse lines bring new insights into the molecular mechanisms regulating mammalian fertilization. We discuss models for these processes and we include studies showing that these mechanisms may be conserved across different mammalian species.
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Affiliation(s)
- Hanisha H Bhakta
- Department of Biological Science, College of Engineering and Natural Sciences, The University of Tulsa, Tulsa, OK 74104, USA
| | - Fares H Refai
- Department of Biological Science, College of Engineering and Natural Sciences, The University of Tulsa, Tulsa, OK 74104, USA
| | - Matteo A Avella
- Department of Biological Science, College of Engineering and Natural Sciences, The University of Tulsa, Tulsa, OK 74104, USA
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Tokuhiro K, Dean J. Glycan-Independent Gamete Recognition Triggers Egg Zinc Sparks and ZP2 Cleavage to Prevent Polyspermy. Dev Cell 2018; 46:627-640.e5. [PMID: 30122633 DOI: 10.1016/j.devcel.2018.07.020] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 05/31/2018] [Accepted: 07/20/2018] [Indexed: 10/28/2022]
Abstract
The zona pellucida surrounding ovulated eggs regulates monospermic fertilization necessary for successful development. Using mouse transgenesis, we document that the N terminus of ZP2 is sufficient for sperm binding to the zona matrix and for in vivo fertility. Sperm binding is independent of ZP2 glycans and does not occur after complete cleavage of ZP2 by ovastacin, a zinc metalloendopeptidase stored in egg cortical granules. Immediately following fertilization, a rapid block to sperm penetration of the zona pellucida is established that precedes ZP2 cleavage but requires ovastacin enzymatic activity. This block to penetration is associated with release of zinc from cortical granules coincident with exocytosis. High levels of zinc affect forward motility of sperm to prevent their passage through the zona matrix. This transient, post-fertilization block to sperm penetration provides a temporal window to complete the cleavage of ZP2, which prevents sperm binding to ensure monospermy.
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Affiliation(s)
- Keizo Tokuhiro
- Laboratory of Cellular and Developmental Biology, NIDDK, National Institutes of Health, Bethesda, MD 20892, USA
| | - Jurrien Dean
- Laboratory of Cellular and Developmental Biology, NIDDK, National Institutes of Health, Bethesda, MD 20892, USA.
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9
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Losano JDA, Angrimani DSR, Pereira RJG, Rocha AM, Criscuolo TS, Barnabe VH, Barnabe RC, Mendes CM, Assumpção MEOA, Nichi M. Utilisation of sperm-binding assay combined with computer-assisted sperm analysis to evaluate frozen-thawed bull semen. Andrologia 2014; 47:77-84. [DOI: 10.1111/and.12225] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/26/2013] [Indexed: 11/29/2022] Open
Affiliation(s)
- J. D. A. Losano
- Department of Animal Reproduction; College of Veterinary Medicine and Animal Science; University of São Paulo; São Paulo Brazil
| | - D. S. R. Angrimani
- Department of Animal Reproduction; College of Veterinary Medicine and Animal Science; University of São Paulo; São Paulo Brazil
| | - R. J. G. Pereira
- Department of Animal Reproduction; College of Veterinary Medicine and Animal Science; University of São Paulo; São Paulo Brazil
| | - A. M. Rocha
- Obstetrics and Gynecology Department; University of Michigan; Ann Arbor MI USA
| | - T. S. Criscuolo
- Embryology Department; Huntington Medicina Reprodutiva; São Paulo Brazil
| | - V. H. Barnabe
- Department of Animal Reproduction; College of Veterinary Medicine and Animal Science; University of São Paulo; São Paulo Brazil
| | - R. C. Barnabe
- Department of Animal Reproduction; College of Veterinary Medicine and Animal Science; University of São Paulo; São Paulo Brazil
| | - C. M. Mendes
- Department of Animal Reproduction; College of Veterinary Medicine and Animal Science; University of São Paulo; São Paulo Brazil
| | - M. E. O. A. Assumpção
- Department of Animal Reproduction; College of Veterinary Medicine and Animal Science; University of São Paulo; São Paulo Brazil
| | - M. Nichi
- Department of Animal Reproduction; College of Veterinary Medicine and Animal Science; University of São Paulo; São Paulo Brazil
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Avella MA, Xiong B, Dean J. The molecular basis of gamete recognition in mice and humans. Mol Hum Reprod 2013; 19:279-89. [PMID: 23335731 DOI: 10.1093/molehr/gat004] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Successful fertilization heralds the onset of development and requires both gamete recognition and a definitive block to polyspermy. Sperm initially bind and penetrate the extracellular zona pellucida (ZP) that surrounds ovulated eggs, but are unable to bind the zona surrounding preimplantation embryos. The ZP of humans is composed of four (ZP1-4) and that of mouse three (ZP1-3) glycoproteins. Models for gamete recognition developed in mice had proposed that sperm bind to ZP3 glycans. However, phenotypes observed in genetically engineered mice are not consistent with this widely accepted model. More recently, taking advantage of the observation that human sperm do not bind to mouse eggs, human ZP2 was defined as the zona ligand in transgenic mouse models using gain-of-function assays. The sperm-binding site is an N-terminal domain of ZP2 that is cleaved by ovastacin, a metalloendoprotease released from egg cortical granules following fertilization. Proteolysis of this docking site provides a definitive block to polyspermy as sperm bind to uncleaved, but not cleaved ZP2 even after fertilization and cortical granule exocytosis. While progress has been made in defining the ZP ligand, less headway has been made in identifying the cognate sperm receptor. Although a number of sperm receptor candidates have been documented to interact with specific proteins in the ZP in vitro, continued fertility after genetic ablation of the cognate gene indicates that none are essential for gamete recognition. These on-going investigations inform reproductive medicine and suggest new therapies to improve fertility and/or provide contraception, thus expanding reproductive choices for human couples.
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Affiliation(s)
- Matteo A Avella
- Laboratory of Cellular and Developmental Biology, NIDDK, National Institutes of Health, Bethesda, MD 20892, USA.
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SOFIKITIS NIKOLAOSV, MIYAGAWA IKUO. Endocrinological, Biophysical, and Biochemical Parameters of Semen Collected via Masturbation versus Sexual Intercourse. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/j.1939-4640.1993.tb00402.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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Grasa P, Pérez-Pé R, Báguena O, Forcada F, Abecia A, Cebrián-Pérez JA, Muiño-Blanco T. Ram Sperm Selection by a Dextran/Swim-Up Procedure Increases Fertilization Rates Following Intrauterine Insemination in Superovulated Ewes. ACTA ACUST UNITED AC 2013; 25:982-90. [PMID: 15477373 DOI: 10.1002/j.1939-4640.2004.tb03171.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The objective of this study was to compare the efficacy of 2 dextran/swim-up media to increase the sperm quality parameters and the maintenance of these parameters at 15 degrees C and 30 degrees C over 6 hours. Additionally, this study examined whether differences in sperm quality reflect different reproductive efficiencies following intrauterine insemination in superovulated ewes. The study involved 2 selected samples (SS) obtained by dextran/swim-up, performed either with (SS+) or without (SS-) capacitating compounds, and a control sample consisting of raw semen diluted in the same medium. The efficacies of the swim-up sperm selection procedures were similar in both media, and no significant differences were found among the evaluated parameters. Conversely, we found important differences between selected and control samples. Sperm motility, viability (as assessed by carboxifluorescein diacetate/propidium iodide [PI] staining), and mitochondrial activity (as assessed by rhodamine 123/PI) were significantly higher in the selected samples than in the control. Additionally, following incubation at 15 degrees C, the preservation of sperm quality was significantly better in the selected samples than in the control samples. After 6 hours of incubation at 15 degrees C, selected samples had a motility value of 46%, which was significantly (P < .001) higher than the value observed in control samples (27%). The percentage of viable cells observed after 6 hours of incubation at 15 degrees C was significantly (P < .0001) higher in selected samples than in the control samples. Furthermore, after 2 hours of incubation at 30 degrees C, swim-up samples had viability values that were significantly (P < .0001) higher than those of the control samples. SS+ and SS- samples did not differ significantly in spermatozoa yield, sperm quality, or survival. Differences between selected samples and controls were reflected in the fertilization rate obtained following intrauterine insemination in superovulated ewes that experienced a 52-hour interval between progestagen removal and artificial insemination. A restricted criterion for fertilization rate evaluation was established, and only the percentage of embryos recovered from the uterine horns 6 days after insemination was considered with respect to the total number of corpora lutea counted in the ovaries. The fertilization rate of SS- samples (50%) was significantly higher (P > .001) than those of the SS+ (2%) and control samples (5%).
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Affiliation(s)
- P Grasa
- Department of Biochemistry, Univeristy of Zaragoza, Miguel Servet, Zaragoza, Spain
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13
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Hammitt DG, Martin PA. Correlations among assays of porcine semen quality following cryopreservation. Theriogenology 2012; 32:369-84. [PMID: 16726684 DOI: 10.1016/0093-691x(89)90004-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/1988] [Accepted: 07/05/1989] [Indexed: 11/20/2022]
Abstract
Correlations between in vitro tests of semen quality, used to predict the in vivo fertilizing potential of sperm, indicate that the tests may substitute for each other in predicting fertilizing potential. Lack of correlation between tests suggest that both tests should be used to estimate the fertilizing potential. The purpose of this study was to establish correlations between several in vitro tests of porcine semen quality following freezing. Tests of motility with and without caffeine, spermatozoa with normal apical ridges, sephadex filtration with and without caffeine and acrosin activity were all correlated with each other. Correlations among these tests ranged from 0.45 to 0.83 (P<0.05). Assays for glutamic oxalacetic transaninase (GOT) were not consistently correlated with other tests. None of these tests of semen quality were correlated with the sperm penetration assay except for the test of motility without caffeine, which was correlated with the number of penetrations per hamster oocyte (r = 0.71, P<0.05).
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Affiliation(s)
- D G Hammitt
- Department of Veterinary Physiology Iowa State University Ames, IA 50011 USA
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Baibakov B, Boggs NA, Yauger B, Baibakov G, Dean J. Human sperm bind to the N-terminal domain of ZP2 in humanized zonae pellucidae in transgenic mice. ACTA ACUST UNITED AC 2012; 197:897-905. [PMID: 22734000 PMCID: PMC3384420 DOI: 10.1083/jcb.201203062] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Fertilization requires taxon-specific gamete recognition, and human sperm do not bind to zonae pellucidae (ZP1-3) surrounding mouse eggs. Using transgenesis to replace endogenous mouse proteins with human homologues, gain-of-function sperm-binding assays were established to evaluate human gamete recognition. Human sperm bound only to zonae pellucidae containing human ZP2, either alone or coexpressed with other human zona proteins. Binding to the humanized matrix was a dominant effect that resulted in human sperm penetration of the zona pellucida and accumulation in the perivitelline space, where they were unable to fuse with mouse eggs. Using recombinant peptides, the site of gamete recognition was located to a defined domain in the N terminus of ZP2. These results provide experimental evidence for the role of ZP2 in mediating sperm binding to the zona pellucida and support a model in which human sperm-egg recognition is dependent on an N-terminal domain of ZP2, which is degraded after fertilization to provide a definitive block to polyspermy.
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Affiliation(s)
- Boris Baibakov
- Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
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15
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Luo J, Yang J, Cheng Y, Li W, Yin TL, Xu WM, Zou YJ. Immunogenicity study of plasmid DNA encoding mouse cysteine-rich secretory protein-1 (mCRISP1) as a contraceptive vaccine. Am J Reprod Immunol 2012; 68:47-55. [PMID: 22429321 DOI: 10.1111/j.1600-0897.2012.01117.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2011] [Accepted: 02/03/2012] [Indexed: 11/28/2022] Open
Abstract
PROBLEM To examine the immunocontraceptive properties of the plasmid pcDNA-mCRISP1 and compare them to the corresponding recombinant mCRISP1 (r-mCRISP1). METHOD OF STUDY RT-PCR and indirect immunofluorescence were performed to observe the mCRISP1 protein expression in COS-7 cells. Three groups of mice received three injections of r-mCRISP1, pcDNA-mCRISP1 or pcDNA vector, respectively. ELISA and Western blot were used to examine the immune responses and immunoreactivity of antisera. Sperm-egg penetration assay was performed to examine the effect of anti-mCRISP1 antibodies in vitro fertilization of mouse oocytes. Fertility and mean litter size were analysed by natural mating. Histological analysis was carried out to look for potential immunopathologic effects of the antibodies. RESULTS COS-7 cells transfected with pcDNA-mCRISP1 present the expression of mCRISP1. Both r-mCRISP1 and pcDNA-mCRISP1 raised an immune response against r-mCRISP1 protein and native CRISP1 in mouse sperm. The titres of anti-mCRISP1 antibodies from DNA immunized mice were significantly lower than that of r-mCRISP1 immunized mice, but it lasted relatively longer. Male and female pcDNA-mCRISP1 injected animals presented a statistically significant reduction in their fertility with no signs of immunopathologic effects. CONCLUSION These studies demonstrated the feasibility of generating an immune response to mCRISP1 protein by DNA vaccine and pcDNA-mCRISP1 plasmid causing significant anti-fertility potential.
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Affiliation(s)
- Jin Luo
- Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, China
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FARLIN ME, JASKO DJ, GRAHAM JK, SQUIRES EL. Heparin-induced capacitation: a comparison between the bull and stallion. Equine Vet J 2010. [DOI: 10.1111/j.2042-3306.1993.tb04825.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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BLUE BJ, McKINNON A, SQUIRES EL, SEIDEL GE, MUSCARI KT. Capacitation of stallion spermatozoa and fertilisation of equine oocytes in vitro. Equine Vet J 2010. [DOI: 10.1111/j.2042-3306.1989.tb04693.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Kathiravan P, Kalatharan J, Karthikeya G, Rengarajan K, Kadirvel G. Objective sperm motion analysis to assess dairy bull fertility using computer-aided system--a review. Reprod Domest Anim 2010; 46:165-72. [PMID: 20403134 DOI: 10.1111/j.1439-0531.2010.01603.x] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Motility is one of the most important characteristics associated with the fertilizing ability of spermatozoa and is an expression of their viability and structural integrity. Computer-assisted semen analyser (CASA) provides precise and accurate information on different sperm motion characteristics. This article reviews various aspects of computer-aided motility analysis of bull sperm like sample preparation, standardization of instrument settings, importance of various motility parameters evaluated by the system and its impact on basic functional studies of spermatozoa. It gives special emphasis to various aspects of bull sperm motion analysis especially sub-populations of spermatozoa, hyper-activation, motion characteristic in different genetic and age groups, etc. and their utility in predicting the fertility of dairy bulls. The need to fill the gap in research and the necessity of universal standardization of the equipment has been discussed.
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Affiliation(s)
- P Kathiravan
- National Bureau of Animal Genetic Resources, Karnal, Haryana, India.
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19
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Chen DY, Liu LM, Xie QD, Xu L, Huang TH. In vitro and in vivo studies evaluating antisemen antibodies as a potential spermicidal agent in hamsters. Fertil Steril 2009; 92:1116-1123. [PMID: 18835604 DOI: 10.1016/j.fertnstert.2008.07.1748] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2008] [Revised: 07/19/2008] [Accepted: 07/22/2008] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To determine the spermicidal activity of antisemen antibodies in the hamster model. DESIGN Prospective, controlled study. SETTING Advanced preclinical sciences center. ANIMAL(S) Subgroups of 10 and 14 golden hamsters. INTERVENTION(S) Ex vitro and in vivo treatment of sperm with antisemen antibodies or normal rabbit serum. MAIN OUTCOME MEASURE(S) The EC(50) value of antisemen antibodies, the time required for 50% motility loss of progressively motile spermatozoa exposed to antisemen antibodies, the average sperm mitochondrion fluorescence intensity, the rate of fertilization, and the scoring of histologic changes in the hamster vaginal tissue. RESULT(S) The EC(50) value of antisemen antibodies was found 70 microg/mL, and the time required for 50% motility loss of progressively motile spermatozoa exposed to antisemen antibodies (at 70 microg/mL) was 5 minutes; for the experimental and control groups, the average fluorescence intensities of sperm mitochondria were respectively 180.28 +/- 82.24 and 309.74 +/- 148.37, the fertilization rates in vitro were 0.09% and 45%, the rates of fertilization with intrauterine sperm injection were 0 and 15.0%. There was a significant difference between two groups. None of the four hamsters that received antisemen antibodies in gel-polyoxyl-40-stearate had epithelial disruption characteristic of inflammation. CONCLUSION(S) Antisemen antibodies possess appreciable spermicidal potential, which may be explored as an effective constituent of spermicide.
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Affiliation(s)
- De-Yu Chen
- Research Center for Reproductive Medicine, Shantou University Medical College, Shantou, Guangdong, People's Republic of China 515041
| | - Li-Min Liu
- Research Center for Reproductive Medicine, Shantou University Medical College, Shantou, Guangdong, People's Republic of China 515041
| | - Qing-Dong Xie
- Research Center for Reproductive Medicine, Shantou University Medical College, Shantou, Guangdong, People's Republic of China 515041
| | - Lan Xu
- Research Center for Reproductive Medicine, Shantou University Medical College, Shantou, Guangdong, People's Republic of China 515041
| | - Tian-Hua Huang
- Research Center for Reproductive Medicine, Shantou University Medical College, Shantou, Guangdong, People's Republic of China 515041.
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20
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Zhou XL, Sun PN, Huang TH, Xie QD, Kang XJ, Liu LM. Effects of hepatitis B virus S protein on human sperm function. Hum Reprod 2009; 24:1575-83. [PMID: 19279032 DOI: 10.1093/humrep/dep050] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Hepatitis B virus (HBV) has been determined to exist in semen and male germ cells from patients with chronic HBV infection, but no data are yet available on the impact of HBV S protein (HBs), the main component of HBV envelop protein, on the human reproductive system. The purpose of this article was to investigate the effect of HBs on human sperm function. METHODS Sperm motility analyses, sperm penetration assays, mitochondrial membrane potential assays, immunolocalizations with confocal microscopy and flow cytometry analyses were performed. RESULTS HBs reduced sperm motility in a dose- and time-dependent manner and caused the loss of sperm mitochondrial membrane potential. HBs-HBs monoclonal antibody (MAb) complex apparently aggravated such impairments. After 4 h incubation with HBs at concentrations of 25, 50, 100 microg/ml, the percentages of sperm motility a+b significantly decreased compared with the control (P < 0.01). The fertilization rate and the fertilizing index in HBs-treated group were 40% and 0.57, respectively, which were significantly lower than 90% and 1.6, respectively, in the control (P < 0.01). The asialoglycoprotein receptor (ASGP-R) and HBs were found to localize mainly on the postacrosomal region. Both ASGP-R MAb and asialofoetuin, a high-affinity ligand of ASGP-R, inhibited the HBs-caused loss of sperm motility and mitochondrial membrane potential. CONCLUSIONS HBs had adverse effects on human sperm function, and ASGP-R may play a role in the uptake of HBs into sperm cells, as demonstrated by the competitive inhibition of ASGP-R MAb or asialofoetuin, resulting in diminished impairment caused by HBs.
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Affiliation(s)
- Xiao-Ling Zhou
- Research Center for Reproductive Medicine, Shantou University Medical College, Shantou 515041, People's Republic of China
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21
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Abstract
Consideration of the function of the epididymis has undergone profound changes over the last century during which it has moved from a largely neglected male reproductive organ to one that is an increasingly exploited source of sperm for assisted reproduction strategies. From histological studies in the lizard1 it was considered that, ‘…the cells lining the epididymal canal produce a material necessary for the spermatozoa during their passage through the organ …’ whereas a fertility study with guinea-pigs stated boldly that, ‘… changes undergone [by spermatozoa in the epididymis] are not conditioned by some specific action of epididymal secretion …’. The former view found favour in a review of the literature which concluded that, ‘… there are specific epididymal secretions necessary for sperm maturation and survival …’, although the nature of the secretions were not then known. However, this concept, currently held by most of those studying the epididymis of animals, was again contradicted on the basis of clinical work: ‘… it certainly is possible for sperm that have never passed through any length of the epididymis at all to mature on their own …’.
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22
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An G, Huang TH, Wang DG, Xie QD, Ma L, Chen DY. In vitro and in vivo studies evaluating recombinant plasmid pCXN2-mIzumo as a potential immunocontraceptive antigen. Am J Reprod Immunol 2009; 61:227-35. [PMID: 19239425 DOI: 10.1111/j.1600-0897.2009.00685.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
PROBLEMS Study on feasibility of pCXN2-mIzumo as a potential immunocontraceptive antigen. METHOD OF STUDY Two groups of mice received 100 microg/mouse plasmids of pCXN2-mIzumo and pCXN2 respectively. RT-PCR Immunofluorescence assay and ELISA were performed to observe pCXN2-mIzumo expression and antibody response in the inoculated mice. Sperm penetration assay and animal mating were employed to detect differences of in vitro fertilization (IVF) rate and mean litter size between the experimental and control groups. RESULTS Izumo cDNA positive bands were detected in sample from mice immunized with pCXN2-mIzumo. IgG response started to rise at 2 weeks after first boost and reached the highest antibody titers at 2 weeks after third boost of immunization with pCXN2-mIzumo in the experimental mice. In vitro fertilization rate in the experimental group (11.57%) was significantly lower than that in control (36.60%). Significant difference of mean litter size between female experimental and control groups was observed, and there was significant negative correlation between individual anti-serum titers and litter size (r = -0.308, P < 0.05). CONCLUSION pCXN2-mIzumo plasmid possesses appreciable anti-fertility potential.
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Affiliation(s)
- Gang An
- Research Center for Reproductive Medicine, Shantou University Medical College, Shantou, Guangdong, China
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23
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Irvine DS, Aitken RJ. Clinical evaluation of the zona-free hamster egg penetration test in the management of the infertile couple. Prospective and retrospective studies. ACTA ACUST UNITED AC 2008. [DOI: 10.1111/j.1365-2605.1986.tb00913.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Kathiravan P, Kalatharan J, Edwin MJ, Veerapandian C. Computer automated motion analysis of crossbred bull spermatozoa and its relationship with in vitro fertility in zona-free hamster oocytes. Anim Reprod Sci 2008; 104:9-17. [PMID: 17254723 DOI: 10.1016/j.anireprosci.2007.01.002] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2006] [Revised: 11/29/2006] [Accepted: 01/03/2007] [Indexed: 11/28/2022]
Abstract
The objective of this study was to determine the effective relationship between different motion characteristics of bull spermatozoa assessed by computer assisted semen analyzer (CASA) and in vitro fertilization percentage in zona-free hamster oocytes. A total of 64 frozen semen samples from 16 different crossbred bulls (Bos taurusxBos indicus) with four ejaculates from each bull were taken for analysis. Various motion characteristics of spermatozoa like progressive motility, path velocity, progressive velocity, beat cross frequency, straightness and linearity were recorded. Hypo-osmotic swelling test and sperm penetration bioassay were conducted to assess the membrane integrity and fertilization percentage of spermatozoa respectively. Significant positive correlation (P<0.01) was found between fertilization percentage and progressive motility (r=0.791) and between velocity parameters (VAP; r=0.612 and VSL; r=0.625) and fertilization percentage. Among different CASA variables, progressive motility alone contributed to 62.6% variation in the fertilization percentage. The velocity measurements (VAP and VSL) together with progressive motility and %HOS spermatozoa contributed to 66.1% of variation in fertilization percentage which was found to be significant (P<0.05).
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Affiliation(s)
- P Kathiravan
- National Bureau of Animal Genetic Resources, Karnal, India.
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26
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Collins ED, Flowers WL, Shanks RD, Miller DJ. Porcine sperm zona binding ability as an indicator of fertility. Anim Reprod Sci 2008; 104:69-82. [PMID: 17303353 PMCID: PMC2243185 DOI: 10.1016/j.anireprosci.2007.01.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2006] [Accepted: 01/12/2007] [Indexed: 11/24/2022]
Abstract
The escalated use of artificial insemination in swine has increased the importance of determining fertility of a semen sample before it is used. Multiple laboratory assays have been developed to assess fertilizing potential but they have yielded inconsistent results. This experiment sought to determine the relationship between in vitro competitive zona binding ability and in vivo fertility based on heterospermic inseminations and paternity testing. The zona pellucida binding ability and fertility of sperm from 15 boars was assessed by comparing sperm from one boar with sperm from other individual boars in a pairwise fashion using four ejaculates. The relationship of zona binding ability to the mean number of piglets sired per litter for each boar as well as historic fertility data (litter size and farrowing rate) was assessed. The in vitro competition assay consisted of labeling sperm from each boar of the pair with a different fluorophore and incubating an equal number of sperm from each boar in the same droplet with porcine oocytes. The competitive assay was highly effective in ranking boars by zona binding ability (R2=0.94). Paternity testing using microsatellite markers was used to determine the mean number of piglets sired per litter for each boar during heterospermic inseminations. The pairwise heterospermic insemination assay was effective in ranking boar fertility (R2=0.59). Using historical data from these boars, average litter size and farrowing rate were correlated (r=0.81, p<0.001). However, zona binding ability was not significantly correlated with historic farrowing rate data or historic average litter size. Boar sperm zona binding ability was also not correlated significantly with the mean number of piglets sired per litter following heterospermic insemination. But the number of piglets sired by each boar was related to a combination of zona binding ability, sperm motility, normal morphology, acrosomal integrity, and the presence of distal droplets (R2=0.70). These results suggest that zona binding ability is not an accurate predictor of fertilizing ability when used alone; however, when coupled with other sperm assessments, fertility may be predicted successfully.
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Affiliation(s)
- E D Collins
- Department of Animal Sciences, North Carolina State University, Raleigh, NC 27695, United States
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27
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Spindler RE, Huang Y, Howard JG, Wang PY, Zhang H, Zhang G, Wildt DE. Giant panda (Ailuropoda melanoleuca) spermatozoon decondensation in vitro is not compromised by cryopreservation. Reprod Fertil Dev 2007; 18:767-75. [PMID: 17032585 DOI: 10.1071/rd06030] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2006] [Accepted: 05/21/2006] [Indexed: 11/23/2022] Open
Abstract
Natural breeding of giant pandas in captivity is compromised, making artificial insemination and spermatozoa cryopreservation essential for genetic management. This study examined the influence of freeze-thawing on traditional parameters such as motility and spermatozoon functionality, specifically decondensation in vitro. Giant panda spermatozoa were assessed before and after rapid cryopreservation (4 degrees C to -130 degrees C over 2 min) in liquid nitrogen vapour. Spermatozoa pre-incubated in medium for 6 h were co-incubated with cat zonae (2 zonae microL(-1)) for 30 min to effect capacitation and an acrosome reaction. Spermatozoa were then mixed with mature cat oocyte cytoplasm (2 cytoplasm microL(-1)) for 4 h and evaluated for decondensation. Frozen spermatozoa were less motile (P < 0.05) than fresh counterparts immediately post-thawing, but not after 6 h incubation. There were more (P < 0.05) spermatozoa with completely diffused chromatin post-thaw (10.4 +/- 1.3%; mean +/- s.e.m.) compared to fresh counterparts (5.1 +/- 1.0%). However, there was no overall difference (P > 0.05) in the incidence of decondensation between fresh (4 h, 69.8 +/- 5.9%) and thawed (4 h, 71.5 +/- 4.9%) spermatozoa after exposure to cat oocyte cytoplasm. It is concluded that the 'rapid' method now used to cryopreserve giant panda spermatozoa has little impact on spermatozoon decondensation.
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Affiliation(s)
- Rebecca E Spindler
- Conservation and Research Center, Smithsonian's National Zoological Park, Front Royal, VA 22630, USA.
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28
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Roldan ERS, Gomendio M, Garde JJ, Espeso G, Ledda S, Berlinguer F, del Olmo A, Soler AJ, Arregui L, Crespo C, González R. Inbreeding and Reproduction in Endangered Ungulates: Preservation of Genetic Variation through the Organization of Genetic Resource Banks. Reprod Domest Anim 2006; 41 Suppl 2:82-92. [PMID: 16984472 DOI: 10.1111/j.1439-0531.2006.00772.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
There is a constant increase in the number of species suffering marked reductions in population size. This reduction in size and the lack of genetic flow may lead to a decrease in genetic variability and to matings between close relatives (i.e. inbreeding) with an ensuing reduction in fitness. It is thus important to understand the mechanism underlying the deleterious effects of inbreeding and to develop reproductive biotechnologies that will allow the reduction of inbreeding depression by facilitating gene exchange between populations. The study of three endangered species of gazelles, Cuvier's gazelle (Gazella cuvieri), Mohor gazelle (Gazella dama mhorr) and dorcas gazelle (Gazella dorcas neglecta) has revealed that inbreeding negatively affects several semen parameters (motility, sperm morphology, acrosome integrity). Semen cryopreservation has been achieved in the three species but success varies depending on the diluent employed and the level of inbreeding. Artificial insemination of Mohor gazelles have led to the birth of the first gazelle born using frozen-thawed semen but improvements are needed before this technology can be applied on a routine basis for the genetic management of the populations. Collection of oocytes after ovarian stimulation, followed by in vitro maturation, fertilization and culture has met with some initial success in the Mohor gazelle. These, together with other reproductive technologies, will offer an invaluable help in preserving the maximum of genetic diversity of these and related endangered ungulate species.
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Affiliation(s)
- E R S Roldan
- Grupo de Ecología y Biología de la Reproducción, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain.
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29
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Purdy PH. The post-thaw quality of ram sperm held for 0 to 48h at 5°C prior to cryopreservation. Anim Reprod Sci 2006; 93:114-23. [PMID: 16084039 DOI: 10.1016/j.anireprosci.2005.07.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2005] [Accepted: 07/06/2005] [Indexed: 11/17/2022]
Abstract
The effects of holding diluted ram semen at 5 degrees C for up to 48 h prior to cryopreservation were investigated. Semen from six rams was collected by electro-ejaculation in the autumn and again from six different rams in the spring. The sperm concentration and motility were determined using spectrophotometry and computerized automated semen analysis, respectively. Samples were diluted at 23 degrees C to 400 x 10(6)cells/ml in a one-step Tris-egg yolk-glycerol (5%, v/v) media, cooled to 5 degrees C over 2h and maintained at 5 degrees C for the duration of the experiments. Aliquots were loaded into 0.5 ml French straws at 0, 24 or 48 h after cooling, frozen in liquid nitrogen vapor for 12-13 min, 4.5 cm above the liquid nitrogen, and plunged into liquid nitrogen for storage. After thawing, autumn samples frozen after 0, 24, or 48 h of storage exhibited similar percentages of motility (29, 31, 36%, respectively), progressively motility (16, 15, 17%, respectively), plasma membrane integrity (28, 35, 29%, respectively) and live acrosome-reacted cells (0.4, 0.6, 0.8%, respectively; P>0.05). In addition, the quantity of sperm that bound to hen's egg perivitelline membranes after being held at 5 degrees C for 0, 24, or 48 h was not significantly different when the values were expressed as means of the quantity of sperm (155, 177, 106 sperm, respectively) or as the proportion of sperm inseminated (0.39, 0.49, 0.34, respectively; P>0.05). Likewise, ram sperm collected in the spring and frozen at 0, 24 and 48 h after cooling had similar (P>0.05) total motility (21, 25, 20%, respectively), progressive motility (14, 15, 11%, respectively), plasma membrane integrity (26, 33, 31%, respectively) and live acrosome-reacted cells (3.7, 3.5, 3.2%, respectively; P>0.05). The 0 h holding time had significantly less sperm bound to a hen's egg perivitelline membrane compared to the 48 h holding time (250 and 470 sperm, respectively) although the 24h holding time was not different from the 0 or 48 h holding time (281 sperm; P<0.05) but analysis of the proportion of the total sperm inseminated resulted in no significant differences observed (P>0.05). These results indicate that ram sperm can be held at 5 degrees C for up to 48 h prior to freezing with no injurious effects on motility, membrane integrity, or fertilizing potential as indicated by membrane binding ability.
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Affiliation(s)
- P H Purdy
- USDA-ARS-NCGRP, National Animal Germplasm Program, 1111 South Mason Street, Fort Collins, CO 80521-4500, USA.
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30
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Busso D, Cohen DJ, Hayashi M, Kasahara M, Cuasnicú PS. Human testicular protein TPX1/CRISP-2: localization in spermatozoa, fate after capacitation and relevance for gamete interaction. ACTA ACUST UNITED AC 2005; 11:299-305. [PMID: 15734896 DOI: 10.1093/molehr/gah156] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Testicular protein Tpx-1, also known as CRISP-2, is a cysteine-rich secretory protein specifically expressed in the male reproductive tract. Since the information available on the human protein is limited to the identification and expression of its gene, in this work we have studied the presence and localization of human Tpx-1 (TPX1) in sperm, its fate after capacitation and acrosome reaction (AR), and its possible involvement in gamete interaction. Indirect immunofluorescence studies revealed the absence of significant staining in live or fixed non-permeabilized sperm, in contrast to a clear labelling in the acrosomal region of permeabilized sperm. These results, together with complementary evidence from protein extraction procedures strongly support that TPX1 would be mainly an intra-acrosomal protein in fresh sperm. After in vitro capacitation and ionophore-induced AR, TPX1 remained associated with the equatorial segment of the acrosome. The lack of differences in the electrophoretic mobility of TPX1 before and after capacitation and AR indicates that the protein would not undergo proteolytical modifications during these processes. The possible involvement of TPX1 in gamete interaction was evaluated by the hamster oocyte penetration test. The presence of anti-TPX1 during gamete co-incubation produced a significant and dose-dependent inhibition in the percentage of penetrated zona-free hamster oocytes without affecting sperm motility, the AR or sperm binding to the oolema. Together, these results indicate that human TPX1 would be a component of the sperm acrosome that remains associated with sperm after capacitation and AR, and is relevant for sperm-oocyte interaction.
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Affiliation(s)
- D Busso
- Instituto de Biología y Medicina Experimental (IBYME), Buenos Aires (1428), Argentina
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31
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Ali BA, Huang TH, Xie QD. Detection and expression of hepatitis B virus X gene in one and two-cell embryos from golden hamster oocytes in vitro fertilized with human spermatozoa carrying HBV DNA. Mol Reprod Dev 2005; 70:30-6. [PMID: 15515054 DOI: 10.1002/mrd.20185] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The main objectives of this study were to introduce motile human sperm carrying Hepatitis B virus (HBV) DNA to golden hamster oocytes in a co-culture environment and to detect the replication and expression of the HBx gene in early embryonic cells. Zona-free hamster oocytes were inseminated with human sperm carrying pBR322-HBV DNA plasmid using the in vitro fertilization (IVF) technique. Both the one- and two-cell stages of early embryonic development were studied. PCR, RT-PCR, and Dot hybridization were performed to observe the HBx gene and its expression in these stages. "Fluorescence in situ hybridization" (FISH) was carried out to confirm the integration of HBV into the pronucleus, nucleus, and the chromosomes of embryos. The results showed that we have the ability to obtain a fertilization rate of 80%. RT-PCR showed that the HBx gene could be expressed in both one- and two-cell stages of embryonic development. The data suggested the possibility of sperm as a vector for the vertical transmission of HBV DNA to the next generation.
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MESH Headings
- Animals
- Cricetinae
- DNA, Viral/analysis
- DNA, Viral/genetics
- Embryo, Nonmammalian/chemistry
- Embryo, Nonmammalian/cytology
- Embryo, Nonmammalian/virology
- Female
- Fertilization
- Fertilization in Vitro
- Gene Expression
- Genes, Viral/genetics
- Hepatitis B/transmission
- Hepatitis B virus/genetics
- In Situ Hybridization, Fluorescence
- Infectious Disease Transmission, Vertical
- Male
- Oocytes/chemistry
- Oocytes/metabolism
- RNA, Viral/analysis
- RNA, Viral/metabolism
- Spermatozoa/chemistry
- Spermatozoa/metabolism
- Spermatozoa/virology
- Trans-Activators/genetics
- Trans-Activators/metabolism
- Viral Regulatory and Accessory Proteins
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Affiliation(s)
- Bahy-Ahmed Ali
- Research Center for Reproductive Medicine, Department of Cell Biology and Genetics, Shantou University Medical College, Shantou, Guangdong, China
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Soler AJ, Garde JJ. Relationship between the characteristics of epididymal red deer spermatozoa and penetrability into zona-free hamster ova. JOURNAL OF ANDROLOGY 2003; 24:393-400. [PMID: 12721216 DOI: 10.1002/j.1939-4640.2003.tb02688.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A heterologous (zona-free hamster oocytes) in vitro fertilization (IVF) system was used to evaluate the relationship between sperm factors and penetration capacity of epididymal red deer spermatozoa. The sperm parameters evaluated in 36 sperm samples obtained postmortem from stags selectively shot during the rutting season were sperm motility, functional integrity of plasma membrane by means of the hypo-osmotic swelling test (HOST), and, simultaneously, viability and acrosomal status via a triple-stain technique. Zona-free hamster oocytes were used to evaluate the capacity of the different sperm assays to predict in vitro penetration. In order to increase the variability in sperm quality, we recovered samples from stags at different intervals between the death of the male and the collection of the genitalia. All measures of sperm quality declined progressively (P <.001) with increasing intervals between death and sample collection. In addition, many sperm parameters were related to penetration ability in vitro. Subsequently, sperm samples were rearranged in 2 categories according to the interval that had elapsed between death and the collection of the genitalia (group 1, short interval = 0-12 h; group 2, large interval = 18-40 hours). When samples were grouped, less correlation achieved significance, especially for group 1, than when samples were not divided. Also, correlation between the number of sperm per oocyte and sperm parameters for group 1, which had the highest values of sperm quality, failed to reach significance. It is concluded that the classical parameters accepted in assessing the viability of deer spermatozoa can be good predictors of the penetrating ability of the spermatozoa when satisfactory in vitro conditions are used for the development of the IVF system. Also, this study demonstrates that compatible heterologous gamete interaction allows thorough assessment of sperm function in a wild deer.
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Affiliation(s)
- Ana J Soler
- Department of Agroforestry Science and Technology and Game Resources (IDR), Castilla-La Mancha University, Albacete, Spain
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33
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Terada Y, Nakamura S, Morita J, Simerly C, Hewitson L, Murakami T, Yaegashi N, Schatten G, Okamura K. Intracytoplasmic sperm injection: stiletto conception or a stab in the dark. ARCHIVES OF ANDROLOGY 2003; 49:169-77. [PMID: 12746095 DOI: 10.1080/01485010390196760] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
To describe the importance of molecular and cellular analyses in intracytoplasmic sperm injection (ICSI) the authors review the literature on biological challenges in ICSI and associated techniques. Several matters can be proposed in molecular and cellular challenges in ICSI for safety and efficacy: (1) a reliable and convenient animal model for understanding the molecular and cellular basis of human ICSI must be established, and molecular and cellular analysis of the first cell cycle of human fertilization should be better understood; (2) a proper assay for human sperm function that contributes to the indication for ICSI should be developed; and (3) de novo and transmitted genetic security in ICSI should be examined.
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Affiliation(s)
- Y Terada
- Department of Obstetrics and Gynecology, Tohoku University School of Medicine, Sendai, Japan.
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Fuse H, Iwasaki M, Mizuno I, Ikehara-Kawauchi Y. Evaluation of acrosome reactivity using the Acrobeads test in varicocele patients: findings before and after treatment. ARCHIVES OF ANDROLOGY 2003; 49:1-6. [PMID: 12647773 DOI: 10.1080/01485010390129124] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The Acrobeads test was performed on semen samples from 43 patients with varicocele before and after varicocelectomy. Sperm motility significantly increased after surgery (p <.05), while sperm concentration and motile sperm concentration did not alter postoperatively. Sperm motion analysis using CellSoft 3000 did not demonstrate a significant change after treatment. Acrobeads score significantly increased after the procedure (p<.005). Pregnancy was achieved in 10 patients (28%). Acrobeads score in cases that achieved pregnancy was increased postoperatively (p<.005). The percentage of patients with a postoperative increase in Acrobeads score in the group that achieved pregnancy was significantly higher than that observed in the unsuccessful group (p <.05). Sperm parameters other than the Acrobeads score did not show a significant difference between the successful and unsuccessful patients. The Acrobeads test assessed postoperatively can be useful in precisely evaluating fertility potential after varicocele repair.
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Affiliation(s)
- H Fuse
- Department of Urology, Faculty of Medicine, Toyama Medical and Pharmaceutical University, Sugitani, Toyama, Japan.
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Abstract
OBJECTIVE To assess the ability of Kruger morphology to predict the outcome of the sperm penetration assay (SPA). DESIGN A retrospective review using univariate and multivariate analysis, t tests, and logistic regression was performed to examine the correlation between Kruger morphology and the optimized zona-free hamster egg sperm penetration assay (O-HESPA). SETTING University hospital. PATIENT(S) One hundred fifteen private-practice patients who underwent semen analysis, including Kruger morphology and O-HESPA, as part of an infertility evaluation between 1997-2000 were retrospectively reviewed. INTERVENTION(S) Retrospective analysis of the sperm penetration assay. MAIN OUTCOME MEASURE(S) Univariate and multivariate analysis, Student's t test, and logistic regression were performed to analyze Kruger morphology, count, and viability and their relationship to SCI result. RESULT(S) Univariate analysis demonstrated a statistically significant correlation between SCI and sperm count, viability, and Kruger morphology. Multivariate analysis demonstrated statistically significant correlations between SCI and count and viability. There was no correlation between Kruger morphology and SCI. Logistic regression was performed on the SCI results, using count, Kruger morphology, and viability. Sperm count was found to be the only variable that was statistically significant with respect to SCI results. CONCLUSION This study demonstrated that Kruger morphology assessment cannot be used to predict the results of SCI or replace it in the management of the infertile couple.
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Affiliation(s)
- Michael P Zahalsky
- Department of Urology, Beth Israel Medical Center, New York, New York 10003, USA
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Gadkar S, Shah CA, Sachdeva G, Samant U, Puri CP. Progesterone Receptor as an Indicator of Sperm Function. Biol Reprod 2002; 67:1327-36. [PMID: 12297552 DOI: 10.1095/biolreprod67.4.1327] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Expression of progesterone receptor (PR) localization on spermatozoa was determined in men with normal and abnormal spermiograms. Studies were also carried out to evaluate the potential of PR as a marker of sperm function. Progesterone receptor expression on spermatozoa from men with normozoospermia (n = 8), oligozoospermia (n = 7), asthenozoospermia (n = 8), oligoasthenozoospermia (n = 7), and teratozoospermia (n = 11) was analyzed using an immunocytochemical method with monoclonal antibodies against PR, and flow cytometry using a cell-impermeable fluorescein-tagged progesterone coupled to BSA complex (P-FITC-BSA). Both methods revealed significantly fewer (P < 0.05) PR-positive spermatozoa in men with oligozoospermia, asthenozoospermia, oligoasthenozoospermia, and teratozoospermia compared with men with normozoospermia, thereby suggesting that down-regulation of PR expression in spermatozoa may be one of the causes of male infertility. Spermatozoa from men with normozoospermia (n = 12), oligozoospermia (n = 12), asthenozoospermia (n = 12), oligoasthenozoospermia (n = 9), and teratozoospermia (n = 10) were exposed to low osmotic conditions in the hypoosmotic swelling (HOS) test and then analyzed for PR expression using P-FITC-BSA complex. A significantly higher percentage (P < 0.05) of spermatozoa with physiologically active plasma membrane (HOS+) lacked PR expression (HOS+PR-) in all categories of men with infertility, thereby suggesting that compared to the HOS test, PR expression is a better indicator of sperm function. Furthermore, PR expression in spermatozoa showed a strong (P < 0.05) positive correlation with their ability to undergo an in vitro acrosome reaction. This was observed in all study groups (i.e., normozoospermia, r = 0.8545; oligozoospermia, r = 0.8711; asthenozoospermia, r = 0.7645; oligoasthenozoospermia, r = 0.9003; and teratozoospermia, r = 0.8676). This suggests a potential role for PR in the events leading to the acrosome reaction in sperm.
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Affiliation(s)
- Sushama Gadkar
- Institute for Research in Reproduction, Indian Council of Medical Research, Parel, Mumbai 400 012, India
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MATSUKAWA K, TAKAHASHI M, HANADA A. Assay for Penetrability of Frozen-thawed Stallion Spermatozoa into Zona-free Hamster Oocytes. J Reprod Dev 2002. [DOI: 10.1262/jrd.48.539] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | - Masayoshi TAKAHASHI
- National Institute of Livestock and Grassland Science
- Tohoku National Agricultural Experiment Station
| | - Akira HANADA
- Faculty of Textile Science and Technology, Shinshu University
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Cohen DJ, Ellerman DA, Busso D, Morgenfeld MM, Piazza AD, Hayashi M, Young ET, Kasahara M, Cuasnicu PS. Evidence that human epididymal protein ARP plays a role in gamete fusion through complementary sites on the surface of the human egg. Biol Reprod 2001; 65:1000-5. [PMID: 11566719 DOI: 10.1095/biolreprod65.4.1000] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Human epididymal sperm protein ARP, a member of the cysteine-rich secretory proteins (CRISP) family, exhibits significant homology with rat epididymal protein DE, a candidate molecule for mediating sperm-egg fusion in rodents. The aim of this study was to investigate the involvement of ARP in human gamete fusion. Sequential extraction of proteins from ejaculated human sperm revealed the existence of a population of ARP that is tightly associated with the sperm surface and thus, potentially capable of participating in gamete interaction. Exposure of capacitated human sperm to a polyclonal antibody against recombinant ARP (anti-ARP) produced a significant and concentration-dependent inhibition in the ability of human sperm to penetrate zona-free hamster eggs. This inhibition was not due to a deleterious effect on the gametes because anti-ARP affected neither sperm viability or motility, nor egg penetrability. The antibody did not inhibit the occurrence of spontaneous or Ca(2+) ionophore-induced acrosome reaction, nor did it inhibit the ability of sperm to bind to the oolema, supporting a specific inhibition of the antibody at the sperm-egg fusion level. As a relevant evidence for a role of ARP in gamete fusion, the existence of complementary sites for this protein on the surface of human eggs was investigated. Experiments in which zona-free human oocytes discarded from in vitro fertilization programs were exposed to ARP, fixed, and subjected to indirect immunofluorescence revealed the presence of specific ARP-binding sites on the entire surface of the human egg, in agreement with the fusogenic properties of the human oolema. Together, these results strongly support the participation of ARP in the sperm-egg fusion process, suggesting that this protein would be the functional homologue of DE in humans.
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Affiliation(s)
- D J Cohen
- Instituto de Biología y Medicina Experimental, (1428) Buenos Aires, Argentina
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39
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Landim-Alvarenga FC, Alvarenga MA, Seidel GE, Squires EL, Graham JK. Penetration of zona-free hamster, bovine and equine oocytes by stallion and bull spermatozoa pretreated with equine follicular fluid, dilauroylphosphatidylcholine or calcium ionophore A23187. Theriogenology 2001; 56:937-53. [PMID: 11665894 DOI: 10.1016/s0093-691x(01)00620-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Experiments evaluated the ability of follicular fluid (FF), dilauroylphosphatidylcholine (PC12) and the calcium ionophore A23187 (A23187) to induce capacitation in stallion and bull spermatozoa, determined by the ability of the spermatozoa to penetrate zona-free hamster, bovine and equine oocytes. Spermatozoa suspensions were incubated at 37 degrees C in one of the following treatments: 1) a modified Tyrode's medium (BGM3) alone; 2) BGM3 + FF; 3) BGM3 + PC12; 4) BGM3 + FF + PC12; 5) BGM3 + A23187; and 6) BGM3 + FF + A23187. Treated spermatozoa were incubated with zona-free hamster, bovine and equine oocytes for 3 h, after which oocytes were stained to assess spermatozoa penetration. The number of hamster oocytes penetrated by spermatozoa incubated in BGM3 alone (1/30) or in presence of FF (2/31) was significantly lower (P < 0.05) than by spermatozoa treated with PC12 or A23187 (16/30 and 17/30, respectively). Processing stallion spermatozoa either by a swim-up procedure or by centrifugation through a Percoll gradient increased the percentages of motile spermatozoa in the final sample, and spermatozoa collected by both processes penetrated similar numbers of zona-free hamster oocytes (P > 0.05). Although treating spermatozoa with PC12 or A23187 enabled both stallion and bull spermatozoa to penetrate oocytes, higher numbers of bovine oocytes were penetrated by bull spermatozoa (25/30) than by stallion spermatozoa (4/30) regardless of spermatozoal treatment. However, the number of zona-free hamster and equine oocytes penetrated by bull spermatozoa (25/30 and 12/18 respectively) and stallion spermatozoa (17/30 and 15/21 respectively) were similar (P > 0.05). We conclude that both PC12 and A23187 capacitate stallion and bull spermatozoa sufficiently to permit the acrosome reaction to occur, enabling spermatozoa to penetrate homologous and heterologous zona-free oocytes.
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Affiliation(s)
- F C Landim-Alvarenga
- Department of Animal Reproduction and Veterinary Radiology, UNESP, Botucatu, SP, Brazil
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Abstract
Fertilization is defined as the process of union of two gametes, eggs and sperm. When mammalian eggs and sperm come into contact in the female oviduct, a series of steps is set in motion that can lead to fertilization and ultimately to development of new individuals. The pathway begins with species-specific binding of sperm to eggs and ends a relatively short time later with fusion of a single sperm with each egg. Although this process has been investigated extensively, only recently have the molecular components of egg and sperm that participate in the mammalian fertilization pathway been identified. Some of these components may participate in gamete adhesion and exocytosis, whereas others may be involved in gamete fusion. Here we describe selected aspects of mammalian fertilization and address some of the latest experimental evidence that bears on this important area of research.
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Affiliation(s)
- P M Wassarman
- Department of Biochemistry and Molecular Biology, Mount Sinai School of Medicine, 1 Gustave L. Levy Place, New York, New York 10029-6574, USA.
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HAMANO KI, SASAKI K, MASAKI J, KANG MS, SASADA H, SATO E, TSUJII H. Effect of Maitotoxin on the Acrosome Reaction in Bull Spermatozoa. J Reprod Dev 2001. [DOI: 10.1262/jrd.47.295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | - Katsuhiko SASAKI
- Maebashi Institute of Animal Science, Livestock Improvement Association of Japan
| | - Junji MASAKI
- Maebashi Institute of Animal Science, Livestock Improvement Association of Japan
| | | | - Hiroshi SASADA
- Laboratory of Animal Reproduction, Graduate School of Agricultural Science, Tohoku University
| | - Eimei SATO
- Laboratory of Animal Reproduction, Graduate School of Agricultural Science, Tohoku University
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42
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Terada Y, Luetjens CM, Sutovsky P, Schatten G. Atypical decondensation of the sperm nucleus, delayed replication of the male genome, and sex chromosome positioning following intracytoplasmic human sperm injection (ICSI) into golden hamster eggs: does ICSI itself introduce chromosomal anomalies? Fertil Steril 2000; 74:454-60. [PMID: 10973637 DOI: 10.1016/s0015-0282(00)00671-3] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE To examine nuclear decondensation, positioning of sex chromosomes, and the S-phase in human sperm nuclei following intracytoplasmic sperm injection (ICSI) into hamster eggs. DESIGN Prospective analysis of hamster eggs and human sperm following ICSI. SETTING Division of Reproductive Sciences, Oregon Health Sciences University and Oregon Regional Primate Research Center. PATIENT(S) Fertile donor sperm from a commercial source. INTERVENTION(S) Human sperm were examined by immunofluorescence stain, bromodioxyuridine (BrdU) uptake assay and fluorescence in situ hybridization following ICSI into hamster eggs. MAIN OUTCOME MEASURE(S) Immunostaining and fluorescence in situ hybridization. RESULT(S) Decondensation of human sperm nuclei occurred initially in the basal region, and perinuclear theca of sperm persisted around the condensed apical region. In some sperm nuclei, following ICSI the sex chromosomes were in the apical region, remaining condensed for longer than in the basal region. S-phase entry of human sperm nuclei following ICSI was delayed compared to the zona-free hamster egg penetration assay. CONCLUSION(S) These results force questions about the mechanism of male pronuclear formation after ICSI and suggest new strategies for understanding the basis of chromosomal anomalies leading to birth defects as well as continuing improvements in the safety and efficacy of infertility therapies.
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Affiliation(s)
- Y Terada
- Division of Reproductive Sciences, Oregon Regional Primate Research Center, Beaverton, Oregon, USA
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Abstract
The purpose of this study was to determine if sperm and oocyte proteins that mediate plasma membrane interaction during mammalian fertilization are conserved among porcine and bovine gametes. We examined homologous and heterologous sperm and zona-free oocyte interactions to determine the extent of cross-reactivity between the gametes of these two ungulate species. First, the numbers of ejaculated porcine and bovine sperm bound to the oocyte plasma membrane of intact porcine and bovine oocytes were determined in vitro. There was no significant difference between the number of porcine or bovine sperm that bound to porcine or bovine oocytes (P > 0.25). Second, individual porcine and bovine sperm plasma membrane proteins were identified by binding of homologous or heterologous oocyte plasma membrane to whole sperm plasma membrane on Western ligand blots. The relative amount of labeled oocyte plasma membrane bound to individual sperm plasma membrane proteins was analyzed by laser densitometry. Eight porcine sperm plasma membrane proteins and seven bovine sperm plasma membrane proteins were bound by both porcine and bovine oocyte plasma membrane. A significantly greater relative amount of porcine oocyte plasma membrane than bovine oocyte plasma membrane was bound to the 14- and 10-kD porcine sperm plasma membrane proteins (P < 0.001 and P < 0.01, respectively). A 27-kD bovine sperm plasma membrane protein bound proportionally more bovine oocyte plasma membrane probe than porcine oocyte plasma membrane probe (P < 0.04). These results are consistent with conservation of similar receptor ligand interactions at the gamete plasma membrane among porcine and bovine gametes.
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Affiliation(s)
- B L Sartini
- Department of Animal Science, University of California, Davis, California 95616-8521, USA.
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44
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Kobayashi J, Kohsaka T, Sasada H, Umezu M, Sato E. Fluorescence in situ hybridization with Y chromosome-specific probe in decondensed bovine spermatozoa. Theriogenology 1999; 52:1043-54. [PMID: 10735111 DOI: 10.1016/s0093-691x(99)00193-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
This study was carried out to demonstrate bovine Y chromosome-bearing spermatozoa by rapid fluorescence in situ hybridization (FISH), using a digoxigenin (Dig)-labeled DNA probe specific to bovine Y chromosome. Before the FISH procedure, sperm heads were treated for decondensation with dithiothreitol (DTT) and glutathione (GSH) with or without heparin supplementation. Concentrations of either above 2 mM DTT or above 100 mM GSH induced swelling of the sperm head, which resulted in sufficient detection of the Y chromosome signal in sperm nuclei by rapid FISH (49.8 to 53.4%). When FISH was used with 2 mM DTT or 100 mM GSH on specimens from 7 sires, the rate of detection of the Y chromosome signal varied among sires (5.4 to 49.6%), especially that of the GSH treatment. Supplementation of GSH with heparin (100 U/mL), however, could induce reliable, repeatable detection of the Y chromosome signal in sperm nuclei of all the 7 sires (48.4 to 50.3%). These results show that in bovine spermatozoa decondensed with GSH and heparin, rapid FISH can detect Y chromosome-bearing spermatozoa.
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45
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Neuber E, Havari E, Aquiles Sanchez J, Powers RD, Wangh LJ. Efficient human sperm pronucleus formation and replication in Xenopus egg extracts. Biol Reprod 1999; 61:912-20. [PMID: 10491624 DOI: 10.1095/biolreprod61.4.912] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
We have achieved efficient in vitro reactivation and replication of human sperm nuclei in frog egg extracts by constructing a 4-step protocol that mimics the events of fertilization and pronucleus formation in mammalian eggs. With use of this protocol, 78-97% of human sperm nuclei from fertile donors synchronously swelled and completed full genome replication in about 2 h. We document the changes in nuclear structure that accompany efficient DNA synthesis and discuss future research and potential clinical implications of this new system.
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Affiliation(s)
- E Neuber
- Department of Biology, Brandeis University, Waltham, Massachusetts 02454, USA
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Vazquez-Levin MH, Chue J, Goldberg S, Medley NE, Nagler HM. The relationship between critical evaluation of sperm morphology and the TYB-optimized zona free hamster oocyte sperm penetration assay. INTERNATIONAL JOURNAL OF ANDROLOGY 1999; 22:329-35. [PMID: 10509234 DOI: 10.1046/j.1365-2605.1999.00188.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The objective of this study was to analyse the relationship between the percentage of spermatozoa in semen with normal morphology, assessed using the Tygerberg criteria, and sperm fertilizing ability assessed using the TYB-optimized zona free hamster oocyte sperm penetration assay (TYB-optimized SPA), to evaluate the predictive value of strict morphology on outcome of the SPA. In a retrospective study, 56 samples were analysed. In addition to routine semen parameters, the percentage of spermatozoa with normal morphology (A forms) and the average number of penetrations per oocyte (Sperm Capacitation Index) was evaluated in all cases. Using a multiple linear regression analysis with all semen parameters, sperm morphology was the best predictor (p = 0.001) of the SPA score. The agreement between the percentage of A forms and the Sperm Capacitation Index beyond chance (kappa coefficient) was 0.5842. Twenty-two specimens had abnormal SPA scores, with 21 exhibiting abnormal sperm morphology (Sensitivity = 96%). The remaining 34 samples had normal Sperm Capacitation Index values; of these, 23 had normal sperm morphology in semen (Specificity = 68%). The positive predictive value was 96%, and the negative predictive value was 66%. All semen samples from control donors had normal semen parameters and Sperm Capacitation Index values. In conclusion, the percentage of spermatozoa with normal morphology assessed using Tygerberg criteria (> 14% A forms) are predictive of the results in the TYB-optimized SPA. However, sperm morphology appears to be a better predictor when it is normal than when it is abnormal.
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Affiliation(s)
- M H Vazquez-Levin
- Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
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47
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Pukazhenthi B, Pelican K, Wildt D, Howard J. Sensitivity of domestic cat (Felis catus) sperm from normospermic versus teratospermic donors to cold-induced acrosomal damage. Biol Reprod 1999; 61:135-41. [PMID: 10377041 DOI: 10.1095/biolreprod61.1.135] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Freeze-thawing cat sperm in cryoprotectant results in extensive membrane damage. To determine whether cooling alone influences sperm structure and viability, we compared the effect of cooling rate on sperm from normospermic (N; > 60% normal sperm per ejaculate) and teratospermic (T; < 40% normal sperm per ejaculate) domestic cats. Electroejaculates were divided into raw or washed (Ham's F-10 + 5% fetal calf serum) aliquots, with the latter resuspended in Ham's F-10 medium or Platz Diluent Variant Filtered without glycerol (20% egg yolk, 11% lactose). Aliquots were 1) maintained at 25 degrees C (no cooling; control), 2) cooled to 5 degrees C in a commercial refrigerator for 30 min (rapid cooling; approximately 4 degrees C/min), 3) placed in an ice slush at 0 degrees C for 10 min (ultrarapid cooling; approximately 14 degrees C/min), or 4) cooled to 0 degrees C at 0.5 degrees C/min in a programmable alcohol bath (slow cooling); and aliquots were removed every 4 degrees C. All samples then were warmed to 25 degrees C and evaluated for percentage sperm motility and the proportion of intact acrosomes using a fluorescein-conjugated peanut agglutinin stain. In both cat populations, sperm percentage motility remained unaffected (p > 0.05) immediately after exposure to low temperatures and after warming to 25 degrees C. However, the proportion of spermatozoa with intact acrosomes declined (p < 0.05) after rapid cooling ( approximately 4 degrees C/min) to 5 degrees C (N, 65.6%; T, 27.5%) or ultrarapid cooling ( approximately 14 degrees C/min) to 0 degrees C (N, 62.1%; T, 23.0%) in comparison to the control value (N, 81.5%; T, 77.5%). Transmission electron microscopy of cooled sperm revealed extensive damage to acrosomal membranes. In contrast, slow cooling (0.5 degrees C/min) to 5 degrees C maintained (p > 0.05) a high proportion of spermatozoa with intact acrosomes (N, 75.5%; T, 68.3%), which also remained similar (p > 0.05) between cat populations (N, 64.7%; T, 56.8%) through continued cooling to 0 degrees C. Results demonstrate that 1) rapid cooling of domestic cat sperm induces significant acrosomal damage without altering sperm motility, 2) spermatozoa from teratospermic males are more susceptible to cold-induced acrosomal damage than normospermic counterparts, and 3) reducing the rate of initial cooling markedly decreases sperm structural damage.
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Affiliation(s)
- B Pukazhenthi
- Conservation & Research Center, National Zoological Park, Smithsonian Institution, Front Royal, Virginia 22630, USA.
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48
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Roth TL, Bush LM, Wildt DE, Weiss RB. Scimitar-horned oryx (Oryx dammah) spermatozoa are functionally competent in a heterologous bovine in vitro fertilization system after cryopreservation on dry ice, in a dry shipper, or over liquid nitrogen vapor. Biol Reprod 1999; 60:493-8. [PMID: 9916019 DOI: 10.1095/biolreprod60.2.493] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
A heterologous bovine in vitro fertilization (IVF) system was used to study the functional competence of scimitar-horned oryx spermatozoa after cryopreservation. Four sperm-freezing methods were compared after dilution of ejaculates from six oryx with an equine semen extender: 1) dry ice, 2) dry shipper one-step, 3) dry shipper two-step, and 4) liquid nitrogen vapor. Post-thaw sperm motility, longevity, and acrosomal status were assessed and zona pellucida penetration, fertilization, and embryo cleavage were evaluated after coincubation of thawed oryx spermatozoa with in vitro-matured domestic cow oocytes. Sperm motility index (SMI) decreased (p < 0.05) over a 6-h period, but a high percentage (>/= 65%) of spermatozoa contained intact acrosomes in all treatments. Despite differences in sperm motility among methods, oocyte penetration, fertilization, and embryo cleavage did not differ (p >/= 0.05). However, cleavage success was < 50% across all treatments. There were positive correlations (p < 0.05; r = 0.81-0.97) between sample SMI at 3 and 6 h and fertilization, penetration, and cleavage, but no correlations (p >/= 0.05) between SMI at 0 or 1 h and IVF success. This study demonstrates that compatible heterologous gamete interaction allows thorough assessment of post-thaw sperm function in an endangered antelope. Scimitar-horned oryx spermatozoa appear relatively tolerant of varied cryopreservation methods, and preserved samples exhibit adequate post-thaw function to warrant use for assisted reproduction.
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Affiliation(s)
- T L Roth
- Center for Research of Endangered Wildlife, Cincinnati Zoo and Botanical Garden, Cincinnati, Ohio 45220, USA
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49
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Brahmkshtri BP, Edwin MJ, John MC, Nainar AM, Krishnan AR. Relative efficacy of conventional sperm parameters and sperm penetration bioassay to assess bull fertility in vitro. Anim Reprod Sci 1999; 54:159-68. [PMID: 10066103 DOI: 10.1016/s0378-4320(98)00108-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Frozen semen samples from 10 bulls were thawed and actively motile sperm recovered using a swim-up technique. Calcium ionophore A23187 at 0.5 microM concentration was used for 1 min to induce the acrosome reaction in the sperm. Mature female golden hamsters were superovulated with 50 IU of equine chorionic gonadotrophin followed 56 h later with 75 IU of human chorionic gonadotrophin. The cumulus mass was recovered 17 h after hCG treatment by puncturing the oviducts in the infundibulum region. Subsequently, cumulus cell mass and zona pellucida were digested by 0.1% hyaluronidase and 0.1% trypsin, respectively, to yield zona-free hamster eggs (ZFE). A sperm penetration bioassay was performed by coincubating capacitated sperm at 5 X 10(6) concentration and ZFE for 3 h at 38 degrees C in an air incubator. The conception rate of the bulls was based of an average of 82.6 cows per bull with pregnancy status confirmed by rectal palpation. It was found to be strongly correlated (p < 0.01, r = 0.723) with fertilization percentage, whereas percent motile sperm, percent viable sperm and percent sperm with intact acrosomes were not significantly correlated with the conception rate (r = 0.210, -0.021 and -0.468, respectively). Results of the present study suggest that the sperm penetration bioassay can be reliably used to test the fertilizing potential of bull sperm in vitro.
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Affiliation(s)
- B P Brahmkshtri
- Department of Animal Genetics and Breeding, College of Veterinary Science and Animal Husbandry, Gujarat Agricultural University, Anand, India
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Hewitt DA, England GC. The canine oocyte penetration assay; its use as an indicator of dog spermatozoal performance in vitro. Anim Reprod Sci 1998; 50:123-39. [PMID: 9615185 DOI: 10.1016/s0378-4320(97)00083-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In vitro maturation and fertilisation has yet to be thoroughly investigated in the dog and is work that is required before gamete salvage programmes can be established in endangered canine species. Due to the differences which exist between the reproductive function of Canidae and other domestic species, in vitro requirements of both the oocyte and spermatozoa may also differ, and these remain to be established. The objective of this study was to investigate the ability of in vitro capacitated canine spermatozoa to penetrate the zona pellucida of in vitro matured canine oocytes. Two methods, one which utilised the fluorescent nuclear label Hoechst 33258 in combination with an aceto-orcein stain with light microscopy, and another using the fluorescence microscopy method alone were effective for staining both oocyte nuclear material and penetrated spermatozoal heads. These techniques only rarely allowed identification of both in the same oocyte. Using this assay, two to capacitate and acrosome react in vitro as measured by the chlortetracycline and Hoechst 33258 dual fluorescence staining method. No correlation however was found between acrosomal status of spermatozoa and spermatozoal penetration of homologous oocytes, although some relationship was observed. In addition, it was found that the effect of the stage of oocyte nuclear maturation had no effect upon spermatozoal penetration and that immature oocytes could be penetrated by spermatozoa in this species.
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Affiliation(s)
- D A Hewitt
- Department of Farm Animal and Equine Medicine and Surgery, Royal Veterinary College, University of London, Hatfield, UK.
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