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Chen B, Lan Z, Sun WQ, Cui Q, Si W. Cryopreservation did not affect sperm DNA methylation levels of genes related to fertilization and embryonic development of cynomolgus macaque (Macaca fascicularis). Cryobiology 2022; 108:51-56. [PMID: 35926569 DOI: 10.1016/j.cryobiol.2022.07.004] [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: 03/10/2022] [Revised: 07/27/2022] [Accepted: 07/27/2022] [Indexed: 11/28/2022]
Abstract
DNA methylation alters gene expression in numerous biological processes, including embryonic development. It is little known about the effect of cryopreservation on sperm DNA methylation. The present study has investigated whether cryopreservation causes abnormal DNA methylation in cynomolgus macaque sperm for five critical genes that includes the maternally imprinted gene (SNRPN), genes associated with male infertility (HSPA1L, MTHFR) and genes involved in embryonic development (TET3, LZTR1). Our results showed that sperm motility, the percentage of acrosomal integrity, DNA integrity and mitochondrial membrane potential were decreased after cryopreservation either being frozen with penetrating cryoprotectant, glycerol (Gly) or ethylene glycol (EG), compared to fresh sperm (p = 0.000), but the methylation patterns of the five target genes from cynomolgus macaque sperm samples were not affected after cryopreservation as evaluated by the Bisulfite Sequencing PCR (BSP) method. The data indicates that the current protocol for sperm cryopreservation of cynomolgus macaque is safe in terms of DNA methylation levels in these genes related to critical sperm functions.
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Affiliation(s)
- Bingbing Chen
- Institute of Biothermal Science and Technology, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China; State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China
| | - Zhenwei Lan
- Laboratory of Biochemistry and Molecular Biology, School of Life Sciences, Yunnan University, Yunnan, 650091, China
| | - Wendell Q Sun
- Institute of Biothermal Science and Technology, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China
| | - Qinghua Cui
- Laboratory of Biochemistry and Molecular Biology, School of Life Sciences, Yunnan University, Yunnan, 650091, China.
| | - Wei Si
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China.
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Silva AM, Pereira AG, Bezerra LGP, Jerônimo Moreira SS, Pereira AF, Oliveira MF, Comizzoli P, Silva AR. Cryopreservation of Testicular Tissue from Adult Red-Rumped Agoutis (Dasyprocta leporina Linnaeus, 1758). Animals (Basel) 2022; 12:ani12060738. [PMID: 35327135 PMCID: PMC8944822 DOI: 10.3390/ani12060738] [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: 02/18/2022] [Revised: 03/09/2022] [Accepted: 03/14/2022] [Indexed: 12/03/2022] Open
Abstract
Simple Summary Testicular tissues are composed of many types of germ cells, including early stages which can be grown up to fully formed spermatozoa following grafting or in vitro culture. The systematic banking of testicular tissues at freezing temperatures is useful for future use in assisted reproduction and to improve the reproductive management of rare mammalian species. The present study explored testicular tissue cryopreservation in the red-rumped agouti by slow freezing or vitrification methods, using different combinations of cryoprotectants. Solid-surface vitrification using the combination of dimethyl sulfoxide and ethylene glycol was the most effective protocol to preserve testicular cell morphology and proliferative potential. Abstract This study measured the effects of different freezing techniques and permeating cryoprotectants on the preservation of testicular tissues from adult red-rumped agoutis. Tissue biopsies (3.0 mm3) from five individuals were allocated to different experimental groups: control (non-cryopreserved); slow freezing (SF), solid-surface vitrification (SSV), and conventional vitrification (CV). Each method used dimethyl sulfoxide (DMSO), ethylene glycol (EG), or a DMSO + EG combination. Morphology, viability, mitochondrial activity, and proliferative potential were assessed in fresh and frozen tissue samples. Testicular morphology was better using SSV with a combination of DMSO and EG. Across the different cryopreservation approaches, as well as cryoprotectant combinations, cell viability was comparable. Regarding mitochondrial activity, DMSO + EG/SSV or CV, and DMSO + EG/CV were similar to the EG/SF group, which was the best group that provided values similar to fresh control groups. Adequate preservation of the proliferative potential of spermatogonia, Leydig cells, and Sertoli cells was obtained using SSV with DMSO + EG. Overall, the use of SSV with DMSO + EG was the best protocol for the preservation of testicular tissues from adult red-rumped agoutis.
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Affiliation(s)
- Andréia M. Silva
- Laboratory of Animal Germplasm Conservation, Department of Animal Sciences, Federal University of Semiarid Region–UFERSA, Mossoró 59625-900, RN, Brazil; (A.M.S.); (A.G.P.); (L.G.P.B.); (S.S.J.M.); (A.F.P.); (M.F.O.)
| | - Ana G. Pereira
- Laboratory of Animal Germplasm Conservation, Department of Animal Sciences, Federal University of Semiarid Region–UFERSA, Mossoró 59625-900, RN, Brazil; (A.M.S.); (A.G.P.); (L.G.P.B.); (S.S.J.M.); (A.F.P.); (M.F.O.)
| | - Luana G. P. Bezerra
- Laboratory of Animal Germplasm Conservation, Department of Animal Sciences, Federal University of Semiarid Region–UFERSA, Mossoró 59625-900, RN, Brazil; (A.M.S.); (A.G.P.); (L.G.P.B.); (S.S.J.M.); (A.F.P.); (M.F.O.)
| | - Samara S. Jerônimo Moreira
- Laboratory of Animal Germplasm Conservation, Department of Animal Sciences, Federal University of Semiarid Region–UFERSA, Mossoró 59625-900, RN, Brazil; (A.M.S.); (A.G.P.); (L.G.P.B.); (S.S.J.M.); (A.F.P.); (M.F.O.)
| | - Alexsandra F. Pereira
- Laboratory of Animal Germplasm Conservation, Department of Animal Sciences, Federal University of Semiarid Region–UFERSA, Mossoró 59625-900, RN, Brazil; (A.M.S.); (A.G.P.); (L.G.P.B.); (S.S.J.M.); (A.F.P.); (M.F.O.)
| | - Moacir F. Oliveira
- Laboratory of Animal Germplasm Conservation, Department of Animal Sciences, Federal University of Semiarid Region–UFERSA, Mossoró 59625-900, RN, Brazil; (A.M.S.); (A.G.P.); (L.G.P.B.); (S.S.J.M.); (A.F.P.); (M.F.O.)
| | - Pierre Comizzoli
- Smithsonian Conservation Biology Institute, National Zoological Park, Veterinary Hospital, Washington, DC 20008, USA;
| | - Alexandre R. Silva
- Laboratory of Animal Germplasm Conservation, Department of Animal Sciences, Federal University of Semiarid Region–UFERSA, Mossoró 59625-900, RN, Brazil; (A.M.S.); (A.G.P.); (L.G.P.B.); (S.S.J.M.); (A.F.P.); (M.F.O.)
- Correspondence:
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Chen B, Wang S, Inglis BM, Ding H, Suo A, Qiu S, Duan Y, Li X, Li S, Sun WQ, Si W. Improving Sperm Cryopreservation With Type III Antifreeze Protein: Proteomic Profiling of Cynomolgus Macaque ( Macaca fascicularis) Sperm. Front Physiol 2021; 12:719346. [PMID: 34671271 PMCID: PMC8521148 DOI: 10.3389/fphys.2021.719346] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 09/02/2021] [Indexed: 12/04/2022] Open
Abstract
Antifreeze protein III (AFP III) is used for the cryopreservation of germ cells in various animal species. However, the exact mechanism of its cryoprotection is largely unknown at the molecular level. In this study, we investigated the motility, acrosomal integrity, and mitochondrial membrane potential (MMP), as well as proteomic change, of cynomolgus macaque sperm after cryopreservation. Sperm motility, acrosomal integrity, and MMP were lower after cryopreservation (p < 0.001), but significant differences in sperm motility and MMP were observed between the AFP-treated sperm sample (Cryo+AFP) and the non-treated sample (Cryo–AFP) (p < 0.01). A total of 141 and 32 differentially expressed proteins were, respectively, identified in cynomolgus macaque sperm cryopreserved without and with 0.1 μg/ml AFP III compared with fresh sperm. These proteins were mainly involved in the mitochondrial production of reactive oxygen species (ROS), glutathione (GSH) synthesis, and cell apoptosis. The addition of AFP III in the sperm freezing medium resulted in significant stabilization of cellular molecular functions and/or biological processes in sperm, as illustrated by the extent of proteomic changes after freezing and thawing. According to the proteomic change of differentially expressed proteins, we hypothesized a novel molecular mechanism for cryoprotection that AFP III may reduce the release of cytochrome c and thereby reduce sperm apoptosis by modulating the production of ROS in mitochondria. The molecular mechanism that AFP III acts with sperm proteins for cellular protection against cryoinjuries needs further study.
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Affiliation(s)
- Bingbing Chen
- Institute of Biothermal Science and Technology, School of Medical Instruments and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China.,State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
| | - Shengnan Wang
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
| | - Briauna Marie Inglis
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
| | - Hao Ding
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
| | - Angbaji Suo
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
| | - Shuai Qiu
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
| | - Yanchao Duan
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
| | - Xi Li
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
| | - Shanshan Li
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
| | - Wendell Q Sun
- Institute of Biothermal Science and Technology, School of Medical Instruments and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Wei Si
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
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Wei YL, She ZY, Huang T, Zhang HT, Wang XR. Male reproductive systems of Macaca mulatta: Gonadal development, spermatogenesis and applications in spermatogonia stem cell transplantation. Res Vet Sci 2021; 137:127-137. [PMID: 33965833 DOI: 10.1016/j.rvsc.2021.04.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 04/16/2021] [Accepted: 04/29/2021] [Indexed: 10/21/2022]
Abstract
Rhesus macaque (Macaca mulatta) is widely applied in animal model construction of infertility, spermatogonia stem cell transplantation and male reproductive diseases. In this review, we describe the seasonal changes of the reproductive system in rhesus macaques, the regular pattern of spermatogenesis and spermatozoa maturation, and the differentiation of spermatogonia and spermatocytes. The duration of the M. mulatta spermatogenesis is approximately 10 days and seminiferous epithelium cycles mainly consist of 12 stages, which provide a suitable model for reproductive studies in non-human primates. Here, we summarize the features of gonadal development and sperm maturation in the rhesus monkeys, which provide important information in the studies of reproductive biology. Rhesus macaque is an excellent animal model in spermatogonia stem cell transplantation. We discuss the applications and progresses of assisted reproductive technologies in sperm liquefaction, semen cryopreservation and spermatogonia stem cell transplantation of rhesus macaques. Besides, we sort out recent proteomic analyses of male reproductive systems and semen samples in rhesus macaques. This review mainly focuses on male reproductive biology and application studies using M. mulatta, which would promote the development of new therapeutic interventions on assisted reproduction and reproductive disease studies in the future.
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Affiliation(s)
- Ya-Lan Wei
- Fujian Obstetrics and Gynecology Hospital, Fuzhou, Fujian 350011, China; Medical Research Center, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350001, China; Key Laboratory of Technical Evaluation of Fertility Regulation for Non-human Primate, National Health Commission, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350013, China.
| | - Zhen-Yu She
- Department of Cell Biology and Genetics, The School of Basic Medical Sciences, Fujian Medical University, Fuzhou, Fujian 350122, China
| | - Tao Huang
- Medical Research Center, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350001, China; Key Laboratory of Technical Evaluation of Fertility Regulation for Non-human Primate, National Health Commission, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350013, China
| | - Hai-Tao Zhang
- Medical Research Center, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350001, China; Key Laboratory of Technical Evaluation of Fertility Regulation for Non-human Primate, National Health Commission, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350013, China
| | - Xin-Rui Wang
- Medical Research Center, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350001, China; Key Laboratory of Technical Evaluation of Fertility Regulation for Non-human Primate, National Health Commission, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350013, China.
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Strelchenko NS, Schmidt JK, Mean KD, Schotzko ML, Golos TG, Slukvin II. Cryopreservation of Mauritian Cynomolgus Macaque ( Macaca fascicularis) Sperm in Chemically Defined Medium. JOURNAL OF THE AMERICAN ASSOCIATION FOR LABORATORY ANIMAL SCIENCE 2020; 59:681-686. [PMID: 32878681 DOI: 10.30802/aalas-jaalas-20-000059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The objective of this study was to optimize cryopreservation of sperm from Mauritian cynomolgus macaques (MCM) in defined conditions. Sperm viability and motility were compared between sperm cryopreserved in chemically-defined freezing media with variable osmolarity and the presence of either ethylene glycol or glycerol. The highest percentage viability (after freeze-thaw) was seen in sperm samples that were cryopreserved in medium with an osmolarity of 310 mOsm, while higher osmolarities markedly decreased sperm viability. Ethylene glycol and glycerol at concentrations of 4.6% and 5%, respectively, preserved sperm viability to an equivalent degree. Although higher motility rates and higher straight-line velocities were observed in sperm samples frozen in glycerol compared with ethylene glycol, these differences were not statistically significant. Thawed sperm frozen in defined conditions with glycerol were capable of fertilizing MCM oocytes in vitro, with development to the blastocyst stage. The protocol described here provides an effective method for cryopreservation of sperm to facilitate subsequent in vitro fertilization and genome editing of embryos in MCM species.
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Affiliation(s)
- Nick S Strelchenko
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, Wisconsin
| | - Jenna Kropp Schmidt
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, Wisconsin
| | - Katherine D Mean
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, Wisconsin
| | - Michele L Schotzko
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, Wisconsin
| | - Thaddeus G Golos
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, Wisconsin; Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, Wisconsin; Department of Obstetrics and Gynecology, University of Wisconsin-Madison, Madison, Wisconsin
| | - Igor I Slukvin
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, Wisconsin; Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison, Madison, Wisconsin; Department of Cell and Regenerative Biology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin;,
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6
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Wang S, Duan Y, Yan Y, Adar C, Braslavsky I, Chen B, Huang T, Qiu S, Li X, Inglis BM, Ji W, Si W. Improvement of sperm cryo-survival of cynomolgus macaque (Macaca fascicularis) by commercial egg-yolk-free freezing medium with type III antifreeze protein. Anim Reprod Sci 2019; 210:106177. [PMID: 31635783 DOI: 10.1016/j.anireprosci.2019.106177] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 08/24/2019] [Accepted: 09/04/2019] [Indexed: 11/26/2022]
Abstract
When nonhuman primate sperm undergoes cryopreservation in an egg yolk medium there is an increased risk that the egg yolk might adversely affect the sperm due to containing of avian pathogens. Although commercial egg-yolk-free medium for human sperm cryopreservation has been used for macaque sperm, the cryo-survival remains less than optimal. The present study, therefore, was conducted to determine the optimal concentration of antifreeze protein (AFP) III supplemented in a commercial egg-yolk-free medium for cynomolgus macaque (Macaca fascicularis) sperm cryo-survival. The function of frozen-thawed sperm was evaluated by post-thaw sperm motility, acrosome integrity, and mitochondrial function. Results indicate that the sperm motilities were greater when 0.1, 1, and 10 μg/ml of AFP III were supplemented into the sperm freezing medium (P < 0.05). In addition, the mitochondrial membrane potential was greater in the sperm cryopreserved with the medium that was supplemented with 0.1 μg/ml of AFP III (P < 0.05). The addition of AFP III at any of the concentrations, however, did not have any cryoprotection effect on the sperm acrosome, and the greatest concentrations of AFP III at 100 and 200 μg/ml had detrimental effects on acrosomal integrity (P < 0.05). Results of the present study indicated the methods used are effective for the cryopreservation of cynomolgus monkey sperm while reducing associated health risks due to avian pathogens being present in egg yolk-based extenders.
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Affiliation(s)
- Shengnan Wang
- Yunnan Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
| | - Yanchao Duan
- Yunnan Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
| | - Yaping Yan
- Yunnan Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
| | - Chen Adar
- Institute of Biochemistry, Food Science, and Nutrition, Robert H. Smith Faculty of Agriculture, Food, and Environment, & Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Rehovot 7610001, Israel
| | - Ido Braslavsky
- Institute of Biochemistry, Food Science, and Nutrition, Robert H. Smith Faculty of Agriculture, Food, and Environment, & Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Rehovot 7610001, Israel
| | - Bingbing Chen
- Yunnan Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
| | - Tianzhuang Huang
- Yunnan Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
| | - Shuai Qiu
- Yunnan Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
| | - Xi Li
- Yunnan Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
| | - Briauna Marie Inglis
- Yunnan Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
| | - Weizhi Ji
- Yunnan Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
| | - Wei Si
- Yunnan Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming 650500, Yunnan, China.
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Cryopreservation of cynomolgus macaque (Macaca fascicularis) sperm with glycerol and ethylene glycol, and its effect on sperm-specific ion channels - CatSper and Hv1. Theriogenology 2017; 104:37-42. [PMID: 28806626 DOI: 10.1016/j.theriogenology.2017.08.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 08/04/2017] [Accepted: 08/04/2017] [Indexed: 12/13/2022]
Abstract
The cryoprotective agent (CPA) is one of the most important factors that affects the cryosurvival of sperm. The aim of the present study was to compare two different CPAs, glycerol (Gly) and ethylene glycol (EG), on the cryopreservation of cynomolgus macaques sperm and evaluate the effects of cryopreservation on sperm motility, acrosomal integrity, DNA integrity, mitochondrial function and the sperm membrane ion channels CatSper and Hv1. Compared to fresh sperm, cryopreservation with either 0.7 M Gly or EG decreased the sperm motility (79.8 ± 1.5% Vs. 47.3 ± 1.8% and 47.6 ± 1.4%), acrosomal integrity (89.6 ± 1.2% Vs. 80.1 ± 1.8% and 79.6 ± 1.7%), DNA integrity (91.9 ± 0.7% Vs. 82.9 ± 1.0% and 82.3 ± 1.0%) and mitochondrial membrane potential (87.9 ± 1.8% Vs. 70.6 ± 2.7% and 67.9 ± 2.5%) and the quantity of the CatSper and Hv1 channels determined by Western Blot (p < 0.05), and EG showed equal cryoprotection to cynomolgus sperm in all of the sperm parameters. Our results indicated, for the first time, that cryopreservation decreases the quantity of sperm membrane ion channels (CatSper and Hv1), which might be one of the reasons that frozen sperm have a low fertilizing ability. The study will be beneficial to understand the biological process involved in sperm cryopreservation of nonhuman primates and contribute to improving cryopreservation protocols than can maintain sperm function and fertilizing ability.
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Induced pluripotent stem cells from highly endangered species. Nat Methods 2011; 8:829-31. [PMID: 21892153 DOI: 10.1038/nmeth.1706] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Accepted: 08/19/2011] [Indexed: 12/19/2022]
Abstract
For some highly endangered species there are too few reproductively capable animals to maintain adequate genetic diversity, and extraordinary measures are necessary to prevent extinction. We report generation of induced pluripotent stem cells (iPSCs) from two endangered species: a primate, the drill, Mandrillus leucophaeus and the nearly extinct northern white rhinoceros, Ceratotherium simum cottoni. iPSCs may eventually facilitate reintroduction of genetic material into breeding populations.
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