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Xu B, Wang R, Wang Z, Liu H, Wang Z, Zhang W, Zhang Y, Su R, Liu Z, Liu Y, Li J, Zhang J. Evaluation of lipidomic change in goat sperm after cryopreservation. Front Vet Sci 2022; 9:1004683. [PMID: 36337197 PMCID: PMC9630556 DOI: 10.3389/fvets.2022.1004683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 09/12/2022] [Indexed: 11/13/2022] Open
Abstract
The current study aimed to detect the relationship between the spermatozoa cryotolerance and the post-thawed sperm lipidome. Ejaculates from 20 goats, and performed a uniform frozen-thawed procedure in this study. According to the total motility of thawed sperm of goats, semen samples were classified into HF group (High Freezers, n = 8) with >60% total motility and LF group (Low Freezers, n = 8) with < 45% total motility. The lipidomic analysis based on UHPLC-MS/MS was utilized to investigate the relationship between sperm cryotolerance and their lipid metabolites expression. The results showed that the cryotolerance of sperm from different individual goats were in great variation. The total motility of post-thawed sperm in HF group (60.93 ± 2.43%) is significantly higher than that in LF group (34.04 ± 3.41%, P < 0.01). And the post-thawed sperm in HF group exhibited significantly higher plasma membrane (59.06 ± 2.34%) and acrosome integrity (62.93 ± 1.15%) than that in LF group (34.06 ± 4.85%, 44.92 ± 2.19% respectively, P < 0.01). The total of 29 lipid subclasses and 1,133 lipid molecules in the post-thawed goat sperm were identified by lipidomics analysis. The lipid content of thawed sperm in HF group was higher than that in LF group, the lipid profile in HF group was significantly separated from LF group, which indicated that the difference in lipid composition and lipid metabolism mode of sperm between the two groups was existed, especially the expression of phosphatidylcholine and triglyceride molecules. In conclusion, the cryotolerance of sperm from different individual goats were in great variation. Sperm with high cryotolerance may be able to uptake more lipids during cryopreservation. The increase in phosphatidylcholine and triglyceride content of thawed. Sperm may relate to more active lipid anabolic processes.
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Affiliation(s)
- Bingbing Xu
- College of Animal Science, Inner Mongolia Agricultural University, Hohhot, China
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Hohhot, China
- Key Laboratory of Mutton Sheep Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Hohhot, China
| | - Ruijun Wang
- College of Animal Science, Inner Mongolia Agricultural University, Hohhot, China
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Hohhot, China
- Key Laboratory of Mutton Sheep Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Hohhot, China
| | - Zhiying Wang
- College of Animal Science, Inner Mongolia Agricultural University, Hohhot, China
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Hohhot, China
- Key Laboratory of Mutton Sheep Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Hohhot, China
| | - Hongfu Liu
- College of Animal Science, Inner Mongolia Agricultural University, Hohhot, China
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Hohhot, China
- Key Laboratory of Mutton Sheep Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Hohhot, China
| | - Zhen Wang
- College of Animal Science, Inner Mongolia Agricultural University, Hohhot, China
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Hohhot, China
- Key Laboratory of Mutton Sheep Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Hohhot, China
| | - Weihang Zhang
- College of Animal Science, Inner Mongolia Agricultural University, Hohhot, China
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Hohhot, China
- Key Laboratory of Mutton Sheep Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Hohhot, China
| | - Yanjun Zhang
- College of Animal Science, Inner Mongolia Agricultural University, Hohhot, China
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Hohhot, China
- Key Laboratory of Mutton Sheep Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Hohhot, China
| | - Rui Su
- College of Animal Science, Inner Mongolia Agricultural University, Hohhot, China
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Hohhot, China
- Key Laboratory of Mutton Sheep Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Hohhot, China
| | - Zhihong Liu
- College of Animal Science, Inner Mongolia Agricultural University, Hohhot, China
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Hohhot, China
- Key Laboratory of Mutton Sheep Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Hohhot, China
| | - Yongbin Liu
- Research Center for Animal Genetic Resources of Mongolian Plateau, College of Life Sciences, Inner Mongolia University, Hohhot, China
| | - Jinquan Li
- College of Animal Science, Inner Mongolia Agricultural University, Hohhot, China
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Hohhot, China
- Key Laboratory of Mutton Sheep Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Hohhot, China
- Inner Mongolia Jinlai Animal Husbandry Technology Co., Ltd., Hohhot, China
- *Correspondence: Jinquan Li
| | - Jiaxin Zhang
- College of Animal Science, Inner Mongolia Agricultural University, Hohhot, China
- Key Laboratory of Animal Genetics, Breeding and Reproduction, Hohhot, China
- Key Laboratory of Mutton Sheep Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Hohhot, China
- Jiaxin Zhang
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Bastos NM, Rossi GF, da Silva Leão BC, Negrão F, Ferreira CR, Vrisman DP, Rodrigues NN, Zorzetto MF, de Paula Freitas-Dell'Aqua C, Vantini R, Monteiro FM, Mercadante MEZ, Eberlin MN, de Lima VFMH, Mingoti GZ. Effects of paternal diet and antioxidant addition to the semen extender on bovine semen characteristics and on the phenotype of the resulting embryo. Theriogenology 2021; 175:23-33. [PMID: 34481227 DOI: 10.1016/j.theriogenology.2021.08.031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 07/23/2021] [Accepted: 08/18/2021] [Indexed: 10/20/2022]
Abstract
The aim of this study was to examine the effects of long-term dietary supplementation of young Nellore bulls with rumen-protected polyunsaturated fatty acids (PUFAs) and of the inclusion of catalase in the semen extender on semen quality, in vitro sperm fertilizing ability, and intracytoplasmic lipid content in the resulting embryos. Twelve Nellore bulls were supplemented with rumen-protected PUFAs or with a basal diet from 14 to 24 months of age. The semen was collected at the end of supplementation. For cryopreservation, the ejaculate was divided into two equal volumes and catalase was added to the extender in one of the fractions. Thus, the experimental design consisted of a 2 × 2 factorial scheme with two diets (control and PUFA) and two extenders (Cat+ and Cat-). Total motility and the percentage of rapid cells in fresh semen were negatively affected by dietary supplementation with PUFAs (P < 0.05), but these effects did not persist after freezing. The frozen/thawed semen of animals fed PUFAs exhibited an increase in the percentages of damaged plasma and acrosomal membranes, as well as an increase in the proportion of lipids ions at m/z 578 and m/z 757 detected by MALDI-MS. Nevertheless, there was no effect of the treatments on in vitro embryo development. However, embryos derived from bulls supplemented with PUFAs exhibited higher lipid accumulation compared to control (P < 0.05). In conclusion, PUFA supplementation promoted worsening of semen quality without affecting the in vitro sperm fertilizing ability; however, the paternal diet affected the intracytoplasmic lipid content in the resulting embryos.
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Affiliation(s)
- Natália Marins Bastos
- São Paulo State University (UNESP), Department of Animal Reproduction, Graduate Program in Genetics and Animal Breeding, School of Agrarian and Veterinary Sciences, Campus Jaboticabal, São Paulo, Brazil.
| | - Guilherme Fazan Rossi
- São Paulo State University (UNESP), Department of Animal Reproduction, Graduate Program in Veterinary Medicine, School of Agrarian and Veterinary Sciences, Campus Jaboticabal, São Paulo, Brazil
| | - Beatriz Caetano da Silva Leão
- São Paulo State University (UNESP), Department of Animal Reproduction, Graduate Program in Veterinary Medicine, School of Agrarian and Veterinary Sciences, Campus Jaboticabal, São Paulo, Brazil
| | - Fernanda Negrão
- Proteomics Center of Excellence, Northwestern University, 2170 Campus Dr, Evanston, IL, USA; ThoMSon Mass Spectrometry Laboratory, Institute of Chemistry, University of Campinas, Cidade Universitaária Zeferino Vaz, Campinas, São Paulo, Brazil
| | - Christina Ramires Ferreira
- ThoMSon Mass Spectrometry Laboratory, Institute of Chemistry, University of Campinas, Cidade Universitaária Zeferino Vaz, Campinas, São Paulo, Brazil; Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA
| | - Dayane Priscila Vrisman
- São Paulo State University (UNESP), Department of Animal Reproduction, Graduate Program in Veterinary Medicine, School of Agrarian and Veterinary Sciences, Campus Jaboticabal, São Paulo, Brazil
| | - Naiara Nantes Rodrigues
- São Paulo State University (UNESP), Department of Animal Reproduction, Graduate Program in Veterinary Medicine, School of Agrarian and Veterinary Sciences, Campus Jaboticabal, São Paulo, Brazil
| | | | | | - Roberta Vantini
- São Paulo State University (UNESP), Department of Animal Reproduction, Graduate Program in Veterinary Medicine, School of Agrarian and Veterinary Sciences, Campus Jaboticabal, São Paulo, Brazil
| | - Fabio Morato Monteiro
- São Paulo State University (UNESP), Department of Animal Reproduction, Graduate Program in Veterinary Medicine, School of Agrarian and Veterinary Sciences, Campus Jaboticabal, São Paulo, Brazil; Instituto de Zootecnia (IZ/APTA), Sertãozinho, São Paulo, Brazil
| | | | - Marcos Nogueira Eberlin
- ThoMSon Mass Spectrometry Laboratory, Institute of Chemistry, University of Campinas, Cidade Universitaária Zeferino Vaz, Campinas, São Paulo, Brazil
| | - Vera Fernanda Martins Hossepian de Lima
- São Paulo State University (UNESP), Department of Animal Reproduction, Graduate Program in Genetics and Animal Breeding, School of Agrarian and Veterinary Sciences, Campus Jaboticabal, São Paulo, Brazil
| | - Gisele Zoccal Mingoti
- São Paulo State University (UNESP), Department of Animal Reproduction, Graduate Program in Veterinary Medicine, School of Agrarian and Veterinary Sciences, Campus Jaboticabal, São Paulo, Brazil; São Paulo State University (UNESP), School of Veterinary Medicine, Laboratory of Reproductive Physiology, Campus Araçatuba, São Paulo, Brazil.
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Li H, Wang B, Yang H, Wang Y, Xing L, Chen W, Wang J, Zheng N. Furosine Posed Toxic Effects on Primary Sertoli Cells through Regulating Cep55/NF-κB/PI3K/Akt/FOX01/TNF-α Pathway. Int J Mol Sci 2019; 20:ijms20153716. [PMID: 31366014 PMCID: PMC6696181 DOI: 10.3390/ijms20153716] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 07/23/2019] [Accepted: 07/25/2019] [Indexed: 12/30/2022] Open
Abstract
As one of the Maillard reaction products, furosine has been widely reported in a variety of heat-processed foods, while the toxicity of furosine on the reproductive system and related mechanisms are unclear. Here, we constructed an intragastric gavage male mice model (42-day administration, 0.1/0.25/0.5 g furosine/Kg body weight per day) to investigate its effects on mice testicle index, hormones in serum, and mice sperm quality. Besides, the lipid metabonomics analysis was performed to screen out the special metabolites and relatively altered pathways in mice testicle tissue. Mice primary sertoli cells were separated from male mice testicle to validate the role of special metabolites in regulating pathways. We found that furosine affected testicle index, hormones expression level and sperm quality, as well as caused pathological damages in testicle tissue. Phosphatidylethanolamine (PE) (18:0/16:1) was upregulated by furosine both in mice testicle tissue and in primary sertoli cells, meanwhile, PE(18:0/16:1) was proved to activate Cep55/NF-κB/PI3K/Akt/FOX01/TNF-α pathway, and as a functional protein in dairy products, lactoferrin could inhibit expression of this pathway when combined with furosine. In conclusion, for the first time we validated that furosine posed toxic effects on mice sperms and testicle tissue through upregulating PE(18:0/16:1) and activating Cep55/NF-κB/PI3K/Akt/FOX01/TNF-α pathway.
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Affiliation(s)
- Huiying Li
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Bingyuan Wang
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Huaigu Yang
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Yizhen Wang
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Lei Xing
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Wei Chen
- Shanghai Applied Protein Technology Co., Ltd., Shanghai 200030, China
| | - Jiaqi Wang
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Nan Zheng
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
- Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
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O'Brien E, Esteso M, Castaño C, Toledano-Díaz A, Bóveda P, Martínez-Fresneda L, López-Sebastián A, Martínez-Nevado E, Guerra R, López Fernández M, Vega R, Guillamón F, Santiago-Moreno J. Effectiveness of ultra-rapid cryopreservation of sperm from endangered species, examined by morphometric means. Theriogenology 2019; 129:160-167. [DOI: 10.1016/j.theriogenology.2019.02.024] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 01/21/2019] [Accepted: 02/24/2019] [Indexed: 12/29/2022]
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Martínez-Fresneda L, O'Brien E, Velázquez R, Toledano-Díaz A, Martínez-Cáceres CM, Tesfaye D, Schellander K, García-Vázquez FA, Santiago-Moreno J. Seasonal variation in sperm freezability associated with changes in testicular germinal epithelium in domestic (Ovis aries) and wild (Ovis musimon) sheep. Reprod Fertil Dev 2019; 31:1545-1557. [DOI: 10.1071/rd18511] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 05/04/2019] [Indexed: 12/12/2022] Open
Abstract
The aim of this study was to examine ovine sperm cryoresistance during the rutting season (RS) and its association with sperm head area and seminiferous epithelium proliferation. Small ruminants show fluctuating testosterone levels throughout the year, which could interfere with spermatogenesis and sperm cryopreservation. Ejaculates, testicular biopsies and blood were collected during the middle and at the end of the RS (Middle-RS vs End-RS) during periods of high and low testosterone levels in Merino and Mouflon rams. Fresh and frozen–thawed sperm quality, sperm morphometry, seminiferous tubule morphometry and testicular proliferation markers (proliferating cell nuclear antigen, proliferation marker protein Ki-67 and transcription factor GATA-4) were evaluated. Post-thaw sperm viability was higher in the End-RS group in both Merino (69.9±8.2 vs 41.6±7.3%; P=0.020) and Mouflon rams (40.9±3.3 vs 24.2±5.0%; P=0.008). Mouflons had larger sperm head area at the End-RS (38.3±0.2 vs 34.3±0.1µm2; P=0.029), whereas there was no difference between Merino groups (35.7±0.5 vs 34.8±1.0µm2). Seminiferous tubule morphometry and proliferation markers showed higher levels of germinal epithelium proliferation in the Middle-RS of both species. In conclusion, sperm freezability is affected during the RS in domestic and wild rams, which could be correlated with changes that occur during spermatogenesis, since there is an effect of season on cell proliferation in the testis.
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Pradieé J, Sánchez-Calabuig M, Castaño C, O'Brien E, Esteso M, Beltrán-Breña P, Maillo V, Santiago-Moreno J, Rizos D. Fertilizing capacity of vitrified epididymal sperm from Iberian ibex (Capra pyrenaica). Theriogenology 2018; 108:314-320. [DOI: 10.1016/j.theriogenology.2017.11.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 11/16/2017] [Accepted: 11/20/2017] [Indexed: 12/23/2022]
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El-Shahat K, Taysser M, Badr M, Zaki K. Effect of heparin, caffeine and calcium ionophore A23187 on in vitro induction of the acrosome reaction of fresh ram spermatozoa. ASIAN PACIFIC JOURNAL OF REPRODUCTION 2016. [DOI: 10.1016/j.apjr.2016.01.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Rajasekharan A, Francis VG, Gummadi SN. Biochemical evidence for energy-independent flippase activity in bovine epididymal sperm membranes: an insight into membrane biogenesis. Reproduction 2013; 146:209-20. [PMID: 23801779 DOI: 10.1530/rep-13-0121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
During the maturation process spermatozoa undergo a series of changes in their lateral and horizontal lipid profiles. However, lipid metabolism in spermatozoa is not clearly understood for two reasons: i) the mature spermatozoa are devoid of endoplasmic reticulum, which is the major site of phospholipid (PL) synthesis in somatic cells, and ii) studies have been superficial due to the difficulty in culturing spermatozoa. We hypothesize that spermatozoa contain biogenic membrane flippases since immense changes in lipids occur during spermatogenic differentiation. To test this, we isolated spermatozoa from bovine epididymides and reconstituted the detergent extract of sperm membranes into proteoliposomes. In vitro assays showed that proteoliposomes reconstituted with sperm membrane proteins exhibit ATP-independent flip-flop movement of phosphatidylcholine (PC), phosphatidylserine, and phosphatidylglycerol. Half-life time of PC flipping was found to be ∼3.2±1 min for whole sperm membrane, which otherwise would have taken ∼11-12 h in the absence of protein. Further biochemical studies confirm the flip-flop movement to be protein-mediated, based on its sensitivity to protease and protein-modifying reagents. To further determine the cellular localization of flippases, we isolated mitochondria of spermatozoa and checked for ATP-independent flippase activity. Interestingly, mitochondrial membranes showed flip-flop movement but were specific for PC with half-life time of ∼5±2 min. Our results also suggest that spermatozoa have different populations of flippases and that their localization within the cellular compartments depends on the type of PL synthesis.
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Affiliation(s)
- Archita Rajasekharan
- Applied Industrial Microbiology Laboratory, Department of Biotechnology, Indian Institute of Technology Madras, Chennai 600 036, India
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Lahnsteiner F, Mansour N, Caberlotto S. Composition and metabolism of carbohydrates and lipids in Sparus aurata semen and its relation to viability expressed as sperm motility when activated. Comp Biochem Physiol B Biochem Mol Biol 2010; 157:39-45. [PMID: 20441800 DOI: 10.1016/j.cbpb.2010.04.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2010] [Revised: 04/23/2010] [Accepted: 04/29/2010] [Indexed: 11/30/2022]
Abstract
The present study investigated aspects of lipid and carbohydrate metabolism in Sparus aurata semen and tested the effect of lipids, carbohydrates and related metabolites on sperm viability using in vitro incubation experiments. Sparus aurata semen contained enzyme systems to metabolize sugars and lipids. Also key enzymes of the tricarboxylic acid cycle and enzymes involved in ATP metabolism were detected. When spermatozoa were incubated in sperm motility inhibiting saline solution for 48 h phospholipid levels decreased constantly and triglycerides levels during the first 24 h of incubation indicating that spermatozoa utilize lipids as energy resources. After 24 h triglycerides levels started to re-increase indicating a change in sperm metabolism, in particular the onset of triglycerides synthesis by the fatty acid synthase complex. In the incubation period from 0 to 24 h glucose levels were constant, and decreased thereafter. Glycogen levels did not change at all. Semen contained also considerable amounts of sialic acid, glucuronic acid and hexosamines, components of mucopolysaccharides. To find out whether lipids, carbohydrates, and related metabolites had a positive effect on sperm functionality semen was incubated together with the described compounds in sperm motility inhibiting saline solution and motility when activated was determined. In the control 37.2+/-10.1% of the spermatozoa were locally motile and 38.3+/-13.3% motile after 24 h, 36.4+/-5.2% were locally motile and 9.6+/-4.5% were motile after 48 h. The swimming velocity was 89.0+/-13.1 microm/s after 24 h and 61.3+/-12.6% after 48 h. Different types of lipids (arachidic acid, linoleic acid, and glycerol trimyristate) and metabolites acting as fuel for the tricarboxylic acid cycle (hydroxybutyrate, ketoglutarate, and pyruvate) had a positive effect on the sperm viability. Tested carbohydrates (fucose, galactose, glucosamine, glucose, glucoheptose, glycogen, and sialic acid) had no effect. Also lactate and fructose-6-phosphate had no effect on sperm viability while glucose-6-phosphate, oxalacetate, and phosphoglycerate had negative effects.
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Affiliation(s)
- Franz Lahnsteiner
- Department of Organismic Biology, University of Salzburg, Hellbrunnerstr. 34, A-5020 Salzburg, Austria.
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Wu C, Stojanov T, Chami O, Ishii S, Shimizu T, Li A, O'Neill C, Shimuzu T. Evidence for the autocrine induction of capacitation of mammalian spermatozoa. J Biol Chem 2001; 276:26962-8. [PMID: 11350972 DOI: 10.1074/jbc.m103107200] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Mammalian spermatozoa require a maturational event after ejaculation that allows them to acquire the capacity for fertilization. This process, known as capacitation, occurs spontaneously in simple defined medium implicating a potential role of autocrine induction. This study shows that the ether phospholipid 1-O-alkyl-2-acetyl-sn-glyceryl-3-phosphocholine (PAF) meets the criteria for an autocrine mediator of capacitation. Sperm released PAF after their dilution into capacitation medium and expressed a receptor for PAF on their membranes. PAF stimulated changes in the motility of sperm and enhanced fertilization in vitro. These actions were inhibited by a PAF receptor antagonist (UR-12519) and by extracellular recombinant PAF:acetylhydrolase (an enzyme that degrades PAF to a biologically inert form). Seminal plasma contained an acid-labile PAF:acetylhydrolase, whereas capacitation was inhibited by an acid-labile factor within seminal plasma, implicating this factor as a potential decapacitation factor within seminal plasma. Sperm from a PAF receptor knock-out mouse strain failed to express the receptor and displayed a significantly (p < 0.01) reduced rate of capacitation, as assessed by the spontaneous onset of the acrosome reaction in vitro. When used for in vitro fertilization, sperm from PAF receptor knock-out mice gave a significantly lower rate of fertilization (21.5%) than did wild-type sperm (66.7%). The study shows for the first time the operation of an autocrine loop that induces capacitation in sperm in vitro and shows that this loop acts in concert with other mediators of capacitation to promote efficient fertilization.
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Affiliation(s)
- C Wu
- Human Reproduction Unit, Department of Physiology, University of Sydney, Royal North Shore Hospital, St. Leonards, New South Wales 2065, Australia
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