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Sant'Anna JFM, Moraes-Neto A, Castro JP, Sczepanski TS, Pohv JA, Lopera-Barrero N, Artoni RF. Quantitative and qualitative variables of semen from surubim do Iguaçu, Steindachneridion melanodermatum Garavello, 2005 (Siluriformes: Pimelodidae). BRAZ J BIOL 2018; 79:1-5. [PMID: 29590249 DOI: 10.1590/1519-6984.09016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 08/30/2017] [Indexed: 11/22/2022] Open
Abstract
The objective of the present work was to assess the qualitative and quantitative characteristics of semen from the surubim do Iguaçu (Steindachneridion melanodermatum). Induced spermiation was achieved in eleven males with mean weight of 1.76 ± 0.48 kg and average age of two years and semen was collected by stripping. The average volume was 1.34 ± 0.73 mL. The duration of sperm motility was 154.4 ± 72.6 and 149.0 ± 77.5 seconds after activation with hatchery water and distilled water, respectively. The sperm concentration estimated by hemocytometer was 5.423 ± 2.155 x 1010 spermatozoa/mL. The results indicate that S. melanodermatum semen is easily obtained during the spawning season and the seminal characteristics are adequate insemination and subsequent in vitro fertilization.
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Affiliation(s)
- J F M Sant'Anna
- Programa de Pós-graduação em Biologia Evolutiva, Universidade Estadual de Ponta Grossa - UEPG, Av. Carlos Cavalcanti, 4748, CEP 84030-900, Ponta Grossa, PR, Brasil
| | - A Moraes-Neto
- Programa de Pós-graduação em Ciência Animal, Universidade Federal de Mato Grosso do Sul - UFMS, Av. Senador Felinto Müller, 2443, CEP 79070-900, Campo Grande, MS, Brasil
| | - J P Castro
- Programa de Pós-graduação em Genética Evolutiva e Biologia Molecular, Universidade Federal de São Carlos - UFSCar, Rodovia Washington Luiz, Km 235, CEP 13560-970, São Carlos, SP, Brasil
| | - T S Sczepanski
- Programa de Pós-graduação em Biologia Evolutiva, Universidade Estadual de Ponta Grossa - UEPG, Av. Carlos Cavalcanti, 4748, CEP 84030-900, Ponta Grossa, PR, Brasil
| | - J A Pohv
- Programa de Pós-graduação em Ciência Animal, Universidade Federal de Mato Grosso do Sul - UFMS, Av. Senador Felinto Müller, 2443, CEP 79070-900, Campo Grande, MS, Brasil
| | - N Lopera-Barrero
- Programa de Pós-graduação em Ciência Animal, Universidade Estadual de Londrina - UEL, Rod. Cendo Garcia Cid, Pr 445, Km 380, CEP 86057-970, Londrina, PR, Brasil
| | - R F Artoni
- Programa de Pós-graduação em Biologia Evolutiva, Universidade Estadual de Ponta Grossa - UEPG, Av. Carlos Cavalcanti, 4748, CEP 84030-900, Ponta Grossa, PR, Brasil.,Programa de Pós-graduação em Genética Evolutiva e Biologia Molecular, Universidade Federal de São Carlos - UFSCar, Rodovia Washington Luiz, Km 235, CEP 13560-970, São Carlos, SP, Brasil
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Abstract
In fish with external fertilization, sperm must reach the oocyte through the micropyle to enter the cytoplasm. Fertilization success is then influenced by characteristics of oocytes or sperm. In this study, we evaluated oocyte morphology and sperm motility parameters and their effects on the inseminating dose in a teleost fish Astyanax altiparanae. Interestingly, we found one of the lowest yet described inseminating doses in teleosts (2390 spermatozoa oocyte-1 ml-1). Such a fertilization efficacy may be explained by the long duration of sperm motility (>75 s), the small oocyte diameter (695.119 µm), large micropyle diameter (7.57 µm), and the presence of grooves on the oocyte surface that guides spermatozoon to the fertilization area. Additionally, we have described for the first time a structure that combines grooves on the chorion surface and a ridge in the micropylar area.
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Yanagimachi R, Harumi T, Matsubara H, Yan W, Yuan S, Hirohashi N, Iida T, Yamaha E, Arai K, Matsubara T, Andoh T, Vines C, Cherr GN. Chemical and physical guidance of fish spermatozoa into the egg through the micropyle†,‡. Biol Reprod 2017; 96:780-799. [PMID: 28371886 PMCID: PMC6355103 DOI: 10.1093/biolre/iox015] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 03/13/2017] [Accepted: 03/21/2017] [Indexed: 02/06/2023] Open
Abstract
Eggs of teleost fish, unlike those of many other animals, allow sperm entry only at a single site, a narrow canal in the egg's chorion called the micropyle. In some fish (e.g., flounder, herring, and Alaska pollock), the micropyle is a narrow channel in the chorion, with or without a shallow depression around the outer opening of micropyle. In some other fish (e.g., salmon, pufferfish, cod, and medaka), the micropyle is like a funnel with a conical opening. Eggs of all the above fish have a glycoprotein tightly bound to the chorion surface around the micropyle. This glycoprotein directs spermatozoa into the micropylar canal in a Ca2+-dependent manner. This substance, called the micropylar sperm attractant or MISA, increases fertilization efficiency and is essential in herring. In flounder, salmon, and perhaps medaka, fertilization is possible without MISA, but its absence makes fertilization inefficient because most spermatozoa swim over the micropyle without entering it. The mechanism underlying sperm-MISA interactions is yet to be determined, but at least in herring the involvement of Ca2+ and K+ channel proteins, as well as CatSper and adenylyl cyclase, is very likely. In some other fish (e.g., zebrafish, loach, and goldfish), the chorion around the micropyle is deeply indented (e.g., zebrafish and loach) or it has radially or spirally arranged grooves around the outer opening of the micropyle (e.g., goldfish). MISA is absent from the eggs of these fish and sperm entry into micropylar canal seems to be purely physical.
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Affiliation(s)
- Ryuzo Yanagimachi
- Department of Anatomy, Biochemistry and Physiology, Institute for Biogenesis
Research, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii,
USA
| | - Tatsuo Harumi
- Department of Anatomy, Asahikawa Medical University, Asahikawa, Hokkaido,
Japan
| | - Hajime Matsubara
- Department of Aquatic Biology, Tokyo University of Agriculture, Abashiri,
Hokkaido, Japan
| | - Wei Yan
- Department of Physiology and Cell Biology, University of Nevada School of
Medicine, Reno, Nevada, USA
| | - Shuiqiao Yuan
- Department of Physiology and Cell Biology, University of Nevada School of
Medicine, Reno, Nevada, USA
| | - Noritaka Hirohashi
- Oki Marine Biological Station, Shimane University, Okino-shima, Shimane,
Japan
| | - Tomohiro Iida
- Oki Marine Biological Station, Shimane University, Okino-shima, Shimane,
Japan
| | - Etsuro Yamaha
- Nanae Fresh-water Laboratory, Field Science Center for Northern Biosphere,
Hokkaido University, Nanae, Hokkaido, Japan
| | - Katsutoshi Arai
- Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido,
Japan
| | - Takahiro Matsubara
- South Ehime Fishery Research Center, Ehime University, Ainan, Ehime,
Japan
| | - Tadashi Andoh
- Seikai National Fisheries Research Institute, Japan Fisheries Research and
Education Agency, Taira-machi, Nagasaki, Japan
| | - Carol Vines
- Bodega Marine Laboratory, University of California Davis, Bodega Bay,
California, USA
| | - Gary N. Cherr
- Bodega Marine Laboratory, University of California Davis, Bodega Bay,
California, USA
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Ultrastructural morphology of the envelope of Dover sole Solea solea eggs from fertilization until hatching with emphasis on sample preparation. Micron 2017; 99:9-18. [PMID: 28395188 DOI: 10.1016/j.micron.2017.03.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 03/25/2017] [Accepted: 03/25/2017] [Indexed: 11/20/2022]
Abstract
This study is the first to describe the ultrastructural morphology of the envelope of Solea solea eggs from fertilisation until hatching. Defining the ultrastructural morphology of fish eggs is important for species identification and may assist in predicting the effect of external influences on these early life stages. In first instance, various fixation and embedding protocols were assessed to explore the morphology of the egg envelope, whereby the encountered difficulties were highlighted. The successful protocol for SEM proved to be combined fixation with 4% glutaraldehyde in 0.1M cacodylate buffer for minimum 4h with post-fixation of 2h with 1% OsO4 in 0.1M cacodylate buffer. For TEM, puncturing the egg envelope during the first steps of the fixation protocol was necessary to allow the embedding medium to penetrate through the egg envelope. Based on both scanning and transmission electron microscopical examination, three distinct layers were discerned in the egg envelope. During the development of the fish embryo, a change in the outer structure of the egg was observed. Scanning electron microscopical examination of one day post-fertilisation eggs (DPF) revealed a homogeneous outer layer, displaying a large number of pores uniformly distributed on the surface of the egg envelope. Starting from 2 DPF parts of the outermost layer or two outer layers peeled off. The second deeper layer showed larger pores, with less defined edges. In the third innermost layer irregular indentations were noted. On transmission electron microscopy the first outermost layer of 1 DPF eggs clearly folded into the pores. The second layer was more electron dense, had a uniform appearance and did not cover the surface of the pores. The third innermost layer was much thicker and possessed indentations. A total number of 12 undulating zones were discriminated based on different degrees of electron density. Prior to hatching, the compact structure of the innermost layer was distorted by dispersed holes and tears.
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Lahnsteiner F, Mansour N. The effect of temperature on sperm motility and enzymatic activity in brown trout Salmo trutta, burbot Lota lota and grayling Thymallus thymallus. JOURNAL OF FISH BIOLOGY 2012; 81:197-209. [PMID: 22747813 DOI: 10.1111/j.1095-8649.2012.03323.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The effect of temperature on sperm motility was investigated in brown trout Salmo trutta, burbot Lota lota and grayling Thymallus thymallus using water and sperm motility prolonging saline solution (SMPS) for motility activation. The effect of temperature (4-20° C) on spermatozoal enzymes for energy supply [malate dehydrogenase (MDH), pyruvate kinase (PK), adenylate kinase (AK)], flagellar movement [Mg(2+) adenosine triposphatase (ATPase)] and oxidative defence [peroxidase (POX)] were measured in S. trutta and L. lota. Temperatures yielding the highest initial sperm motility rates and swimming velocities were 4-6° C for S. trutta [investigated range (IR) = 4-12° C] and L. lota (IR = 2-8° C) and 8-16° C (IR = 4-16° C) for T. thymallus. Motility variables were re-measured after 30 s in S. trutta, after 45 s in T. thymallus and after 60 s in L. lota in water and after 2 min in all investigated species in SMPS. Motility variables were increased by low temperatures and the results differed between water and SMPS. In S. trutta and L. lota, the temperature resulting in highest activities of MDH, PK, AK and ATPase was 4° C. POX had a very narrow temperature optimum at 20° C in both species. This may indicate that the temperature optimum of enzymes of energy supply and flagellar movement are closely related to motility. The present data show that the variables are affected by temperatures in an ecologically relevant range. Too low, as well as too high temperatures affected sperm motility, and the winter spawners (S. trutta and L. lota) have a narrower temperature optimum than the spring spawner T. thymallus.
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Affiliation(s)
- F Lahnsteiner
- Department of Organismic Biology, University of Salzburg, Hellbrunnerstr. 34, A-5020 Salzburg, Austria.
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Structural analysis of oocytes, post-fertilization events and embryonic development of the Brazilian endangered teleost Brycon insignis (Characiformes). ZYGOTE 2011; 21:85-94. [DOI: 10.1017/s0967199411000396] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
SummaryThe aim of this study was to evaluate the oocytes, post-fertilization events and embryonic development in Brycon insignis, under both scanning electron microscopy and stereomicroscopy. Oocytes and embryos were sampled from spawning up to hatching. Stripped oocytes were spherical, non-adhesive, greenish-brown, possessed a single micropyle, pore-canals and had a mean diameter of 1.46 mm. In 63% of oocytes the germinal vesicle was peripheric. The main post-fertilization events were the fertilization cone formation (20 s), micropyle closure (100–180 s) and agglutination of supernumerary spermatozoa (100–180 s). Embryonic development lasted 30 h at ~24 °C and was characterized by seven stages. Zygote, cleavage, blastula and gastrula stages were first observed at 0.25, 1, 3 and 6 h post-fertilization, respectively. Fertilization rate was determined at the moment of blastopore closure, 10–11 h post-fertilization. The segmentation stage began at 11 h post-fertilization and comprised the development of somites, notochord, optic, otic and Kupffer's vesicles, neural tube, primitive intestine, and development and release of the tail. The larval stage began 21 h post-fertilization and was characterized by the presence of somites, growth and elongation of the larvae. At the hatching stage, embryos presented vigorous contractions of the tail and body leading to chorion rupture (30 h). The morphological characteristics described for B. insignis were similar to that described for other teleost species, and such knowledge is important for a better understanding of reproductive features of a species and useful for ecological and conservational studies.
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Cosson J. Frenetic activation of fish spermatozoa flagella entails short-term motility, portending their precocious decadence. JOURNAL OF FISH BIOLOGY 2010; 76:240-279. [PMID: 20738707 DOI: 10.1111/j.1095-8649.2009.02504.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In most species, fish spermatozoa activate their motility on contact with the external medium (sea or fresh water depending of their reproductive habitat). Their flagella immediately develop waves propagated at high beat frequency (up to 70 beats s(-1)), which propel these sperm cells at high velocity (6-10 mm min(-1)), but for a quite short period of time, usually limited to minutes. Their specific inability to restore their energy content (mostly adenosine triphosphate) fast enough relatively to their high rate of energy consumption by flagellar contributes mainly to the activity arrest of motility, as the spermatozoa need to rely on early accumulated energy prior to activation. This review of the published data explains the present understanding of physico-chemical mechanisms by which flagellar motility is activated (mostly through osmotic and ionic regulation) and then propels sperm cells at speed. It aims also to describe the gradual arrest of their motility much of which occurs within a few minutes.
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Affiliation(s)
- J Cosson
- Centre national de la recherche scientifique (CNRS), UMR 7009, Université P. et M. Curie, Marine Station, 06230, Villefranche sur mer, France.
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A sperm cryopreservation protocol for the loach Misgurnus anguillicaudatus and its applicability for other related species. Anim Reprod Sci 2009; 116:335-45. [DOI: 10.1016/j.anireprosci.2009.02.021] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2008] [Revised: 02/02/2009] [Accepted: 02/16/2009] [Indexed: 11/23/2022]
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Abstract
SummaryIn the present work, we analyzed the structure of oocytes and fertilized eggs of the piracanjuba fish (Brycon orbignyanus) under light and scanning electron microscopy. After inducing spawning, samples were collected at the moment of oocyte extrusion, when oocytes and semen were mixed (time 0), as well as at 10, 20 and 30 s after mixing, every minute up to 10 min, and then at 15 and 20 min. The oocytes are spherical, translucent and greenish with a mean diameter of 1.3 ± 0.11 mm. During the extrusion, cytoplasmic movement was observed in eggs towards the micropyle, characterizing the animal pole. At the moment of fertilization, the cortical cytoplasm showed a higher concentration of cortical alveoli at the animal pole than at the vegetal pole. The cortical alveoli breakdown promoted the elevation of the chorion with a consequent increase in egg diameter (1.95 ± 0.08 mm). The penetration of the spermatozoon promotes the formation of a fertilization cone of spherical external structure, which obstructs the opening of the micropyle. This structure acts as a main mechanism to avoid polyspermy, intercepting the access of supernumerary spermatozoa. Such studies about the reproductive biology of fish are important to species survival and conservation programmes.
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Cosson J, Groison AL, Suquet M, Fauvel C, Dreanno C, Billard R. Marine fish spermatozoa: racing ephemeral swimmers. Reproduction 2008; 136:277-94. [PMID: 18524881 DOI: 10.1530/rep-07-0522] [Citation(s) in RCA: 124] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
After a long period of spermatogenesis (several weeks to months), marine fish spermatozoa are delivered at male spawning in seawater (SW) at the same time as ova. In some fish species, as the ova micropyle closes quickly after release, these minute unicells, the spermatozoa, have to accomplish their task of reaching the micropyle within a very brief period (several seconds to minutes), for delivery of the haploid male genetic information to the ova. To achieve this goal, their high-performance motile equipment, the flagellum, must fully activate immediately on contact with the SW and then propel the sperm cell at an unusually high initial velocity. The cost of such 'hyperactivity' is a very rapid consumption of intracellular ATP that outstrips the supply. The spermatozoa become rapidly exhausted because mitochondria cannot compensate for this very fast flagellar energy consumption. Therefore, any spermatozoon ends up with two possibilities: either becoming exhausted and immotile or reaching the egg micropyle within its very short period of forward motility (in the range of tens of seconds) before micropyle closure in relation to both contact of SW and cortical reaction. The aim of the present review is to present step by step the successive events occurring in marine fish spermatozoa from activation until their full arrest of motility. The present knowledge of activation mechanisms is summarized, as well as a description of the motility parameters characterizing the motility period. As a complement, in vitro results on axonemal motility obtained after demembranation of flagella bring further understanding. The description of the sperm energetic content (ATP and other high energy compounds) and its evolution during the swimming period is also discussed. A general model aiming to explain all the successive cellular events occurring immediately after the activation is presented. This model is proposed as a guideline for understanding the events governing the sperm lifespan in the marine fish species that reproduce through external fertilization.
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Affiliation(s)
- Jacky Cosson
- CNRS, Univ. of Paris VI, P&M Curie, UMR 7009, Marine Station, 06230 Villefranche sur mer, France.
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Mansour N, Lahnsteiner F, Patzner RA. Seminal vesicle secretion of African catfish, its composition, its behaviour in water and saline solutions and its influence on gamete fertilizability. ACTA ACUST UNITED AC 2004; 301:745-55. [PMID: 15559936 DOI: 10.1002/jez.a.94] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The seminal vesicle secretion (SVS) of the African catfish, Clarias gariepinus, was investigated by analytical and experimental methods. SVS consists mainly of proteins and glycoproteins which are responsible for its viscous and sticky nature. The secretion contains also high activities of acid phosphatase, alkaline phosphatase, and proteases. These catabolic enzymes do not have functions in autolysis or liquefaction of SVS but are considered to eliminate aging spermatozoa from the proximal portions of seminal vesicle and from the spermatic duct. SVS of the African catfish is unstable in the environment relevant for natural spawning. When SVS was mixed with water, seminal plasma or different types of saline solutions its protein coagulated forming fibrous or granular particles of variable size within a few seconds. Pure SVS completely inhibited the motility as the sticky secretion hindered spermatozoa in free swimming. SVS had also a negative effect on sperm fertility, egg fertility, and sperm egg contact, as the fertilization was drastically suppressed in the presence of SVS. Basing on our analytical and experimental results we exclude that SVS has functions in stabilizing the viability of spermatozoa stored in the spermatic ducts or is an energy resource of spermatozoa. It also does not improve or stabilize the fertilization process and has no functions in adhering the eggs to substrates or in covering the eggs for mechanical protection or antibacterial defense. A function of SVS in the male and female communication during the prenuptial spawning behaviour is discussed.
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Affiliation(s)
- Nabil Mansour
- Institute for Zoology, University of Salzburg, A-5020 Salzburg, Austria
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Lahnsteiner F, Berger B, Horvath A, Urbanyi B, Weismann T. Cryopreservation of spermatozoa in cyprinid fishes. Theriogenology 2000; 54:1477-98. [PMID: 11191871 DOI: 10.1016/s0093-691x(00)00469-6] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The present study investigated semen cryopreservation in cyprinid fish using computer-assisted sperm motility analysis for viability control. Spermatozoa of the bleak, Chalcalbumus chalcoides, were used as a basic model to describe the toxic and cryoprotective effects of internal and external cryoprotectants, their most effective concentrations and combinations, the freezing and thawing conditions, and the effects of equilibration. We also used these data to develop a cryopreservation protocol for Barbus barbus, Chondrostoma nasus, Ctenopharyngodon idella, Cyprinus cario, Hypohtalmichthys molitrix, Leuciscus cephalus, Rutilus meidingerii, and Vimba vimba. For all investigated species the optimal extender composition was a buffered physiological sperm motility-inhibiting saline solution containing 10% DMSO and 0.5% glycin. The optimal sperm equilibration period in the extender was < or = 5 min. Freezing was performed in an insulated box in liquid nitrogen vapor and it was optimal at 4 to 5 cm above the surface of the liquid, depending on the species. Thawing was optimal in a 25 degrees C water bath whereby the thawing time ranged depending on species from 15 to 45 sec. This cryopreservation protocol resulted in frozen-thawed semen with 35 to 65% motile and 5 to 25% locally motile spermatozoa depending on the quality of fresh semen.
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Affiliation(s)
- F Lahnsteiner
- lnstitute for Zoology, University of Salzburg, Austria.
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Shibata Y, Iwamatsu T, Oba Y, Kobayashi D, Tanaka M, Nagahama Y, Suzuki N, Yoshikuni M. Identification and cDNA cloning of alveolin, an extracellular metalloproteinase, which induces chorion hardening of medaka (Oryzias latipes) eggs upon fertilization. J Biol Chem 2000; 275:8349-54. [PMID: 10722665 DOI: 10.1074/jbc.275.12.8349] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Chorion hardening is triggered by the contents of cortical alveoli that are released upon fertilization of medaka (Oryzias latipes) eggs. We purified the chorion hardening-inducing activity as a single protein from the exudate of cortical alveoli of medaka eggs. This activity was co-purified with proteolytic activity of the chorion protein ZI-1,2. Based on the amino acid sequence of purified protein, we cloned the cDNA of this protein from a medaka ovarian cDNA library. Sequence analyses revealed typical sequence features, a zinc-binding motif and a methionine turn motif, of the astacin metalloproteinase family. We termed this protein "alveolin." Alveolin has a molecular mass of 21.5 kDa deduced by the amino acid sequence and neutral optimal pH range. Alveolin hydrolyzes ZI-1,2. Alveolin activity was strongly inhibited by metal-chelating agents but not by various proteinase inhibitors. To our knowledge, this is the first description of the isolation and identification of the chorion hardening-inducing factor from cortical alveoli exudate of teleost eggs.
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Affiliation(s)
- Y Shibata
- Laboratory of Reproductive Biology, Department of Developmental Biology, National Institute for Basic Biology, Okazaki 444-8585, Japan
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Iwamatsu T, Onitake K, Matsuyama K, Satoh MA, Yukawa S. Effect of Micropylar Morphology and Size on Rapid Sperm Entry into the Eggs of the Medaka. Zoolog Sci 1997. [DOI: 10.2108/zsj.14.623] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Iwamatsu T, Yoshizaki N, Shibata Y. Changes in the chorion and sperm entry into the micropyle during fertilization in the teleostean fish, Oryzias latipes. Dev Growth Differ 1997; 39:33-41. [PMID: 9079033 DOI: 10.1046/j.1440-169x.1997.00005.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Specific antibodies against the major chorionic glycoproteins (ZI1-2 and ZI3) of unfertilized eggs were used to analyze the differences in the chorion and its surrounding constituents before and after fertilization. The glycoproteins in the inner layers of the chorion and its surrounding material were specifically stained by both of the antibodies. Thirty and 60 min after activation, the thickness of the chorion's inner layers was already reduced and the micropylar canal was closed. At the same time, the broadly diluted mucous area (DMA) of glycoproteins on the outermost layer of the chorion in unfertilized eggs was modified to a thin, compact layer. When unfertilized eggs were treated with trypsin, the inner third portion of the micropylar canal closed and the glycoproteins in the DMA were digested. The incidence of sperm entry into the micropyle of these eggs was extremely reduced. These results suggest that in medaka eggs, the chorionic glycoproteins in the DMA on the chorion surface, which have an affinity for spermatozoa, play an important role in sperm guidance into the micropyle.
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Affiliation(s)
- T Iwamatsu
- Department of Biology, Aichi University of Education, Kariya, Japan
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Sorbera LA, Mylonas CC, Zanuy S, Carrillo M, Zohar Y. Sustained administration of GnRHa increases milt volume without altering sperm counts in the sea bass. ACTA ACUST UNITED AC 1996. [DOI: 10.1002/(sici)1097-010x(19961201)276:5<361::aid-jez6>3.0.co;2-m] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Griffin FJ, Vines CA, Pillai MC, Yanagimachi R, Cherr GN. Sperm motility initiation factor is a minor component of the Pacific herring egg chorion. Dev Growth Differ 1996. [DOI: 10.1046/j.1440-169x.1996.t01-1-00009.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Fausto AM, Carcupino M, Scapigliati G, Taddei AR, Mazzini M. Fine structure of the chorion and micropyle of the sea bass eggDicentrarchus labrax(Teleostea, Percichthydae). ACTA ACUST UNITED AC 1994. [DOI: 10.1080/11250009409355871] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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