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Hossen S, Sukhan ZP, Cho Y, Kho KH. Physiological evaluation of seasonal sperm quality in a biannual spawner, Pacific abalone: Effects on in-vitro fertilization and cryotolerance. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 269:115809. [PMID: 38086264 DOI: 10.1016/j.ecoenv.2023.115809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 12/04/2023] [Accepted: 12/08/2023] [Indexed: 01/12/2024]
Abstract
Pacific abalone, Haliotis discus hannai, is a highly valuable gastropod mollusk commonly found in Southeast Asia. The present study aims to analyze the seminal plasma quality, sperm quality, and cryotolerance of the Pacific abalone sperm during its reproductive season. The seminal plasma quality was evaluated by analyzing biochemical and metabolite composition, enzymatic activity (superoxide dismutase, catalase, and glutathione), and lipid peroxidation (LPO) activity. The sperm quality was evaluated by analyzing motility, concentration, volume, ATP content, acrosome integrity (AI), plasma membrane integrity (PMI), mitochondrial membrane potential (MMP), DNA integrity, and fertilization potential. The cryotolerance capacity was evaluated by analyzing post-thaw motility, AI, PMI, MMP, and DNA integrity. Seminal plasma osmolarity was significantly higher (1123.3 ± 1.5 mOsmL-1) in May compared to other reproductive periods, with Cl- (516.8 ± 0.5 mM) and Na+ (460.2 ± 0.4 mM) as the dominant ions. The seminal plasma pH remained constant at 6.8 throughout the reproductive season. Improved enzymatic activity and lower LPO were detected in May or June. Sperm quality indicators were similar in May and June, except for sperm production. The fertilization potential (May: 93.0 ± 4.4%, June: 86.0 ± 7.2%) and hatching rate (May: 86.6 ± 5.78%, June: 82.3 ± 3.2%) of Pacific abalone were significantly higher in May or June than they were in other reproductive seasons. The motility (May: 50.19 ± 2.35%, June: 49.96 ± 1.60%), AI (May: 44.02 ± 3.46%, June: 42.16 ± 3.61%), PMI (May: 54.12 ± 3.29%, June: 52.82 ± 2.58%), and MMP (May: 44.02 ± 3.46%, June: 42.16 ± 3.61%) of the cryopreserved sperm were similar in May and June compared with those preserved in other reproductive seasons. The DNA integrity of the cryopreserved sperm was similar in May (80.3 ± 6.7%) or June (78.9 ± 7.4%) and had a higher cryotolerance than in other reproductive seasons. Hence, it can be suggested that May and/or June are suitable periods for sperm physiology experiments, artificial reproduction, and sperm cryopreservation of Pacific abalone.
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Affiliation(s)
- Shaharior Hossen
- Department of Fisheries Science, Chonnam National University, 50 Daehak-ro, Yeosu, Jeollanam-do, South Korea
| | - Zahid Parvez Sukhan
- Department of Fisheries Science, Chonnam National University, 50 Daehak-ro, Yeosu, Jeollanam-do, South Korea
| | - Yusin Cho
- Department of Fisheries Science, Chonnam National University, 50 Daehak-ro, Yeosu, Jeollanam-do, South Korea
| | - Kang Hee Kho
- Department of Fisheries Science, Chonnam National University, 50 Daehak-ro, Yeosu, Jeollanam-do, South Korea.
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Herrera F, Bondarenko O, Boryshpolets S. Osmoregulation in fish sperm. FISH PHYSIOLOGY AND BIOCHEMISTRY 2021; 47:785-795. [PMID: 34076793 DOI: 10.1007/s10695-021-00958-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 04/27/2021] [Indexed: 06/12/2023]
Abstract
In most fish exhibiting external fertilization, spermatozoa become motile after release into water, triggered by differences between intracellular and extracellular conditions such as osmotic pressure, ion composition, and pH. The rapid change in osmolarity initiating spermatozoon motility induces osmotic pressure, resulting in active water movement across the cell membrane. Mechanisms of ion and water transport across the plasma membrane and cell volume regulation are important in maintaining structure and functional integrity of the cell. The capacity of the fish spermatozoon plasma membrane to adapt to dramatic environmental changes is an essential prerequisite for motility and successful fertilization. Adaptation to change in external osmolality may be the basis of spermatozoon function and an indicator of sperm quality. The involvement of specific water channels (aquaporins) in cell volume regulation and motility is highly likely. The goal of this review is to describe basic mechanisms of water transport and their role in fish spermatozoon physiology, focusing on osmoresistance, cell volume regulation, motility, and survival.
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Affiliation(s)
- Fabio Herrera
- Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, University of South Bohemia in České Budějovice, Zátiší 728/II, 389 25, Vodňany, Czech Republic.
| | - Olga Bondarenko
- Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, University of South Bohemia in České Budějovice, Zátiší 728/II, 389 25, Vodňany, Czech Republic
| | - Sergii Boryshpolets
- Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, University of South Bohemia in České Budějovice, Zátiší 728/II, 389 25, Vodňany, Czech Republic
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3
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Nichols ZG, Rikard S, Alavi SMH, Walton WC, Butts IAE. Regulation of sperm motility in Eastern oyster (Crassostrea virginica) spawning naturally in seawater with low salinity. PLoS One 2021; 16:e0243569. [PMID: 33735238 PMCID: PMC7971463 DOI: 10.1371/journal.pone.0243569] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Accepted: 12/28/2020] [Indexed: 01/04/2023] Open
Abstract
Oyster aquaculture is expanding worldwide, where many farms rely on seed produced by artificial spawning. As sperm motility and velocity are key determinants for fertilization success, understanding the regulation of sperm motility and identifying optimal environmental conditions can increase fertility and seed production. In the present study, we investigated the physiological mechanisms regulating sperm motility in Eastern oyster, Crassostrea virginica. Sperm motility was activated in ambient seawater with salinity 4-32 PSU with highest motility and velocity observed at 12-24 PSU. In artificial seawater (ASW) with salinity of 20 PSU, sperm motility was activated at pH 6.5-10.5 with the highest motility and velocity recorded at pH 7.5-10.0. Sperm motility was inhibited or totally suppressed in Na+, K+, Ca2+, and Mg2+-free ASW at 20 PSU. Applications of K+ (500 μM glybenclamide and 10-50 mM 4-aminopyridine), Ca2+ (1-50 μM mibefradil and 10-200 μM verapamil), or Na+ (0.2-2.0 mM amiloride) channel blockers into ASW at 20 PSU inhibited or suppressed sperm motility and velocity. Chelating extracellular Ca2+ ions by 3.0 and 3.5 mM EGTA resulted in a significant reduction and full suppression of sperm motility by 4 to 6 min post-activation. These results suggest that extracellular K+, Ca2+, and Na+ ions are involved in regulation of ionic-dependent sperm motility in Eastern oyster. A comparison with other bivalve species typically spawning at higher salinities or in full-strength seawater shows that ionic regulation of sperm motility is physiologically conserved in bivalves. Elucidating sperm regulation in C. virginica has implications to develop artificial reproduction, sperm short-term storage, or cryopreservation protocols, and to better predict how changes in the ocean will impact oyster spawning dynamics.
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Affiliation(s)
- Zoe G. Nichols
- School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, Alabama, United States of America
| | - Scott Rikard
- School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, Alabama, United States of America
- Auburn University Shellfish Lab, Dauphin Island, Alabama, United States of America
| | | | - William C. Walton
- School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, Alabama, United States of America
- Auburn University Shellfish Lab, Dauphin Island, Alabama, United States of America
| | - Ian A. E. Butts
- School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, Alabama, United States of America
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4
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Boulais M, Demoy-Schneider M, Alavi SMH, Cosson J. Spermatozoa motility in bivalves: Signaling, flagellar beating behavior, and energetics. Theriogenology 2019; 136:15-27. [PMID: 31234053 DOI: 10.1016/j.theriogenology.2019.06.025] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2019] [Revised: 06/11/2019] [Accepted: 06/12/2019] [Indexed: 11/28/2022]
Abstract
Though bivalve mollusks are keystone species and major species groups in aquaculture production worldwide, gamete biology is still largely unknown. This review aims to provide a synthesis of current knowledge in the field of sperm biology, including spermatozoa motility, flagellar beating, and energy metabolism; and to illustrate cellular signaling controlling spermatozoa motility initiation in bivalves. Serotonin (5-HT) induces hyper-motility in spermatozoa via a 5-HT receptor, suggesting a serotoninergic system in the male reproductive tract that might regulate sperm physiology. Acidic pH and high concentration of K+ are inhibitory factors of spermatozoa motility in the testis. Motility is initiated at spawning by a Na+-dependent alkalization of intracellular pH mediated by a Na+/H+ exchanger. Increase of 5-HT in the testis and decrease of extracellular K+ when sperm is released in seawater induce hyperpolarization of spermatozoa membrane potential mediated by K+ efflux and associated with an increase in intracellular Ca2+ via opening of voltage-dependent Ca2+ channels under alkaline conditions. These events activate dynein ATPases and Ca2+/calmodulin-dependent proteins resulting in flagellar beating. It may be possible that 5-HT is also involved in intracellular cAMP rise controlling cAMP-dependent protein kinase phosphorylation in the flagellum. Once motility is triggered, flagellum beats in asymmetric wave pattern leading to circular trajectories of spermatozoa. Three different flagellar wave characteristics are reported, including "full", "twitching", and "declining" propagation of wave, which are described and illustrated in the present review. Mitochondrial respiration, ATP content, and metabolic pathways producing ATP in bivalve spermatozoa are discussed. Energy metabolism of Pacific oyster spermatozoa differs from previously studied marine species since oxidative phosphorylation synthetizes a stable level of ATP throughout 24-h motility period and the end of movement is not explained by a low intracellular ATP content, revealing different strategy to improve oocyte fertilization success. Finally, our review highlights physiological mechanisms that require further researches and points out some advantages of bivalve spermatozoa to extend knowledge on mechanisms of motility.
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Affiliation(s)
- Myrina Boulais
- University of Brest, CNRS, IRD, Ifremer, LEMAR, rue Dumont d'Urville, F-29280, Plouzané, France.
| | - Marina Demoy-Schneider
- University of French Polynesia, UMR 241 EIO, BP 6570, 98702, Faa'a Aéroport, Tahiti, French Polynesia
| | | | - Jacky Cosson
- South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Faculty of Fisheries and Protection of Waters, University of South Bohemia in České Budějovice, Vodňany 389 25, Czech Republic
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Beirão J, Boulais M, Gallego V, O'Brien JK, Peixoto S, Robeck TR, Cabrita E. Sperm handling in aquatic animals for artificial reproduction. Theriogenology 2019; 133:161-178. [PMID: 31108371 DOI: 10.1016/j.theriogenology.2019.05.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 05/01/2019] [Indexed: 12/15/2022]
Abstract
Artificial reproduction involves collection and handling of gametes in a way that secures their quality and maximizes the fertilization outcome. In addition to initial sperm quality, numerous steps can affect the final result of fertilization, from the sperm collection process until gamete mixing (or co-incubation) when the spermatozoon enters or fuses with the oocyte. In this review, we summarize the whole process of sperm handling, from collection until fertilization for fish, penaeid shrimp, bivalve mollusks and marine mammals. To obtain sperm from captive animals, techniques vary widely across taxa, and include stripping by abdominal massage or testis surgical removal in fish, spermatophore collection in penaeid shrimps, gonadal scarification or temperature shock in bivalve mollusks, and voluntary collection via positive reinforcement in mammals. In most cases, special care is needed to avoid contamination by mucus, seawater, urine, or feces that can either activate sperm motility and/or decrease its quality. We also review techniques and extender solutions used for refrigerated storage of sperm across the aforementioned taxa. Finally, we give an overview of the different protocols for in vivo and in vitro fertilization including activation of sperm motility and methods for gamete co-incubation. The present study provides valuable information regarding breeder management either for animal production or species conservation.
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Affiliation(s)
- José Beirão
- Faculty of Biosciences and Aquaculture, Nord University, NO - 8049, Bodø, Norway.
| | - Myrina Boulais
- University of Brest, CNRS, IRD, Ifremer, LEMAR, rue Dumont d'Urville, F-29280, Plouzané, France
| | - Victor Gallego
- Grupo de Acuicultura y Biodiversidad, Instituto de Ciencia y Tecnología Animal, Universitat Politècnica de València, Valencia, Spain
| | - Justine K O'Brien
- Taronga Institute of Science and Learning, Taronga Conservation Society, Bradleys Head Rd, Mosman NSW, 2088, Australia
| | - Silvio Peixoto
- Departamento de Pesca e Aquicultura, Universidade Federal Rural de Pernambuco (UFRPE), Recife, Brazil
| | - Todd R Robeck
- SeaWorld Species Preservation Lab, SeaWorld Parks and Entertainment, 2595 Ingraham Road, San Diego, CA, 92019, USA
| | - Elsa Cabrita
- CCMAR, University of Algarve, Campus of Gambelas, 8005-139 Faro, Portugal
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Zheng X, Deng Z, Qin JG, Wang A, Gu Z, Ma Z. Noble scallop, Chlamys nobilis, sperm motility duration in the post-activation phase. Anim Reprod Sci 2018; 196:197-204. [PMID: 30115521 DOI: 10.1016/j.anireprosci.2018.08.009] [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: 06/06/2018] [Revised: 07/18/2018] [Accepted: 08/07/2018] [Indexed: 10/28/2022]
Abstract
Sperm motility in the post-activation phase is important for conducting and assessing species-specific artificial fertilization protocols. This study characterizes spermatozoa movement of the noble scallop, Chlamys nobilis, during the post-activation phase. Sperm samples were diluted and activated by fresh seawater, and subsequently incubated at 26 °C for 4 h. Sperm movement variables including total motile sperm (TM), rapid sperm (RAP), curvilinear velocity (VCL), straight-line velocity (VSL), average path velocity (VAP), lateral head displacement (ALH) and beat-cross frequency (BCF) after sperm activation was recorded and analyzed using the computer assisted semen analyze system. Based on the motility index (MI), the sperm movement was categorized into four groupings (twitching before full activation, full activation, twitching after full activation, and decreasing during the latter portion of the sperm motility pattern). The full activation lasted 21 min with the greatest movement characteristics except BCF, and there was no difference with twitching before full activation except for the RAP. The greatest TM was observed at 24.5 min after activation. The RAP, VCL, VSL, VAP and ALH values in the post-activation phase increased at full activation, followed by a subsequent decrease, while the BCF continued to trend downward throughout the study. This study contributes to the understanding on the sperm property of the noble scallop for gamete management, fertilization and spat production in aquaculture.
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Affiliation(s)
- Xing Zheng
- State Key Laboratory of Marine Resource Utilization in South China Sea (Hainan University), 58 Renmin Avenue, Haikou, Hainan 570228, PR China; Ocean College, Hainan University, 58 Renmin Avenue, Haikou 570228, Hainan, PR China; Tropical Aquaculture Research and Development Center, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Sanya 572018, PR China
| | - Zhenghua Deng
- Tropical Aquaculture Research and Development Center, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Sanya 572018, PR China
| | - Jian G Qin
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - Aimin Wang
- State Key Laboratory of Marine Resource Utilization in South China Sea (Hainan University), 58 Renmin Avenue, Haikou, Hainan 570228, PR China
| | - Zhifeng Gu
- State Key Laboratory of Marine Resource Utilization in South China Sea (Hainan University), 58 Renmin Avenue, Haikou, Hainan 570228, PR China; Ocean College, Hainan University, 58 Renmin Avenue, Haikou 570228, Hainan, PR China.
| | - Zhenhua Ma
- Tropical Aquaculture Research and Development Center, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Sanya 572018, PR China.
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Boulais M, Suquet M, Arsenault-Pernet EJ, Malo F, Queau I, Pignet P, Ratiskol D, Le Grand J, Huber M, Cosson J. pH controls spermatozoa motility in the Pacific oyster ( Crassostrea gigas). Biol Open 2018; 7:bio031427. [PMID: 29483075 PMCID: PMC5898264 DOI: 10.1242/bio.031427] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 02/20/2018] [Indexed: 11/20/2022] Open
Abstract
Investigating the roles of chemical factors stimulating and inhibiting sperm motility is required to understand the mechanisms of spermatozoa movement. In this study, we described the composition of the seminal fluid (osmotic pressure, pH, and ions) and investigated the roles of these factors and salinity in initiating spermatozoa movement in the Pacific oyster, Crassostrea gigas The acidic pH of the gonad (5.82±0.22) maintained sperm in the quiescent stage and initiation of flagellar movement was triggered by a sudden increase of spermatozoa external pH (pHe) when released in seawater (SW). At pH 6.4, percentage of motile spermatozoa was three times higher when they were activated in SW containing 30 mM NH4Cl, which alkalinizes internal pH (pHi) of spermatozoa, compared to NH4Cl-free SW, revealing the role of pHi in triggering sperm movement. Percentage of motile spermatozoa activated in Na+-free artificial seawater (ASW) was highly reduced compared to ASW, suggesting that change of pHi triggering sperm motility was mediated by a Na+/H+ exchanger. Motility and swimming speed were highest in salinities between 33.8 and 42.7‰ (within a range of 0 to 50 ‰), and pH values above 7.5 (within a range of 4.5 to 9.5).
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Affiliation(s)
- Myrina Boulais
- CNRS, UMR 6539 Lemar (UBO-CNRS-IRD-Ifremer), IUEM, Plouzané 29280, France
| | - Marc Suquet
- Ifremer, UMR 6539 Lemar (UBO-CNRS-IRD-Ifremer), Site expérimental d'Argenton, Landunvez 29840, France
| | | | - Florent Malo
- Ifremer, UMR 6539 Lemar (UBO-CNRS-IRD-Ifremer), Site expérimental d'Argenton, Landunvez 29840, France
| | - Isabelle Queau
- Ifremer, UMR 6539 Lemar (UBO-CNRS-IRD-Ifremer), Site expérimental d'Argenton, Landunvez 29840, France
| | | | - Dominique Ratiskol
- Ifremer, UMR 6539 Lemar (UBO-CNRS-IRD-Ifremer), Site expérimental d'Argenton, Landunvez 29840, France
| | - Jacqueline Le Grand
- Ifremer, UMR 6539 Lemar (UBO-CNRS-IRD-Ifremer), Site expérimental d'Argenton, Landunvez 29840, France
| | - Matthias Huber
- Ifremer, UMR 6539 Lemar (UBO-CNRS-IRD-Ifremer), Site expérimental d'Argenton, Landunvez 29840, France
| | - Jacky Cosson
- University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Vodnany 38925, Czech Republic
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Boulais M, Soudant P, Le Goïc N, Quéré C, Boudry P, Suquet M. Involvement of Mitochondrial Activity and OXPHOS in ATP Synthesis During the Motility Phase of Spermatozoa in the Pacific Oyster, Crassostrea gigas. Biol Reprod 2015; 93:118. [PMID: 26423125 DOI: 10.1095/biolreprod.115.128538] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Accepted: 09/23/2015] [Indexed: 11/01/2022] Open
Abstract
In the Pacific oyster, spermatozoa are characterized by a remarkably long movement phase (i.e., over 24 h) sustained by a capacity to maintain intracellular ATP level. To gain information on oxidative phosphorylation (OXPHOS) functionality during the motility phase of Pacific oyster spermatozoa, we studied 1) changes in spermatozoal mitochondrial activity, that is, mitochondrial membrane potential (MMP), and intracellular ATP content in relation to motion parameters and 2) the involvement of OXPHOS for spermatozoal movement using carbonyl cyanide m-chlorophenyl hydrazone (CCCP). The percentage of motile spermatozoa decreased over a 24 h movement period. MMP increased steadily during the first 9 h of the movement phase and was subsequently maintained at a constant level. Conversely, spermatozoal ATP content decreased steadily during the first 9 h postactivation and was maintained at this level during the following hours of the movement phase. When OXPHOS was decoupled by CCCP, the movement of spermatozoa was maintained 2 h and totally stopped after 4 h of incubation, whereas spermatozoa were still motile in the control after 4 h. Our results suggest that the ATP sustaining flagellar movement of spermatozoa may partially originate from glycolysis or from mobilization of stored ATP or from potential phosphagens during the first 2 h of movement as deduced by the decoupling by CCCP of OXPHOS. However, OXPHOS is required to sustain the long motility phase of Pacific oyster spermatozoa. In addition, spermatozoa may hydrolyze intracellular ATP content during the early part of the movement phase, stimulating mitochondrial activity. This stimulation seems to be involved in sustaining a high ATP level until the end of the motility phase.
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Affiliation(s)
- Myrina Boulais
- Ifremer, UMR 6539 LEMAR (UBO-CNRS-IRD-Ifremer), Station Expérimentale d'Argenton, Landunvez, France
| | - Philippe Soudant
- IUEM, UMR 6539 LEMAR (UBO-CNRS-IRD-Ifremer), Université de Bretagne Occidentale, Plouzané, France
| | - Nelly Le Goïc
- IUEM, UMR 6539 LEMAR (UBO-CNRS-IRD-Ifremer), Université de Bretagne Occidentale, Plouzané, France
| | - Claudie Quéré
- Ifremer, UMR 6539 LEMAR (UBO-CNRS-IRD-Ifremer), Centre de Bretagne, Plouzané, France
| | - Pierre Boudry
- Ifremer, UMR 6539 LEMAR (UBO-CNRS-IRD-Ifremer), Centre de Bretagne, Plouzané, France
| | - Marc Suquet
- Ifremer, UMR 6539 LEMAR (UBO-CNRS-IRD-Ifremer), Station Expérimentale d'Argenton, Landunvez, France
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Alavi SMH, Matsumura N, Shiba K, Itoh N, Takahashi KG, Inaba K, Osada M. Roles of extracellular ions and pH in 5-HT-induced sperm motility in marine bivalve. Reproduction 2014; 147:331-45. [PMID: 24398874 DOI: 10.1530/rep-13-0418] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Factors that inhibit and stimulate the initiation of sperm motility were determined for Manila clam (Ruditapes philippinarum), Pacific oyster (Crassostrea gigas), and Japanese scallop (Patinopecten yessoensis). Compared with artificial seawater (ASW), serotonin (5-hydroxytryptamine creatinine sulfate, 5-HT) could fully trigger sperm motility and increase sperm velocity and motility duration. Sperm motility was decreased in ASW at pH 6.5-7.0 and suppressed at pH 4.0. In Manila clam and Pacific oyster, 5-HT could overcome the inhibitory effects of acidic pH on sperm motility. In the presence of nigericin (a K(+)/H(+) exchanger), sperm motility was only triggered at pH 8.3. Testicular fluid K(+) concentrations were two- to fourfold higher than that in ASW. Sperm motility and velocity were decreased in ASW or 5-HT containing ≥40 mM K(+) or ≥2.5 mM 4-aminopyridine, suggesting K(+) efflux requirement to initiate motility. Sperm motility and velocity were reduced in ASW or 5-HT containing EGTA or W-7, suggesting that extracellular Ca(2)(+) is required for Ca(2)(+)/calmodulin-dependent flagellar beating. Ca(2)(+) influx occurs via Ca(2)(+) channels because sperm motility and velocity were decreased in both ASW and 5-HT containing T-type and L-type Ca(2)(+) channel blockers. 5-HT-dependent initiation of sperm motility was associated with intracellular Ca(2)(+) rise, which was comparable to that seen in ASW but was not observed in the presence of EGTA or a Ca(2)(+) channel blocker. Extracellular Na(+) is also essential for sperm motility initiation via regulation of Na(+)/Ca(2)(+) exchange. Overall, 5-HT-dependent initiation of sperm motility in marine bivalve mollusks is an osmolality-independent mechanism and regulated by extracellular pH, K(+), Ca(2)(+), and Na(+).
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Affiliation(s)
- Sayyed Mohammad Hadi Alavi
- Laboratory of Aquacultural Biology, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-amamiyamachi, Sendai 981-8555, Japan
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