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Foo SA, Deaker D, Byrne M. Cherchez la femme - impact of ocean acidification on the egg jelly coat and attractants for sperm. J Exp Biol 2018; 221:jeb.177188. [DOI: 10.1242/jeb.177188] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Accepted: 04/16/2018] [Indexed: 01/03/2023]
Abstract
The impact of ocean acidification on marine invertebrate eggs and consequences for sperm chemotaxis are unknown. In the sea urchins Heliocidaris tuberculata and H. erythrogramma, with small (93µm) and large (393µm) eggs, respectively, we documented the effect of decreased pH on the egg jelly coat, an extracellular matrix that increases target size for sperm and contains sperm attracting molecules. In near future conditions (pH 7.8, 7.6) the jelly coat of H. tuberculata decreased by 11 and 21%, reducing egg target size by 9 and 17%, respectively. In contrast, the egg jelly coat of H. erythrogramma was not affected. The reduction in the jelly coat has implications for sperm chemotaxis in H. tuberculata. In the presence of decreased pH and egg chemicals, the sperm of this species increased their velocity, motility and linearity, behaviour that was opposite to that seen for sperm exposed to egg chemicals in ambient conditions. Egg chemistry appears to cause a reduction in sperm velocity where attractants guide them in the direction of the egg. Investigation of the effects of decreased pH on sperm isolated from egg chemistry does not provide an integrative assessment of the effects of ocean acidification on sperm function. Differences in the sensitivity of the jelly coat of the two species is likely associated with egg evolution in H. erythrogramma. We highlight important unappreciated impacts of ocean acidification on marine gamete functionality, and insights into potential winners and losers in a changing ocean, pointing to the advantage conveyed by evolution of large eggs.
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Affiliation(s)
- Shawna A. Foo
- Department of Global Ecology, Carnegie Institution for Science, Stanford, CA, USA
| | - Dione Deaker
- School of Medical Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Maria Byrne
- School of Medical Sciences and School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
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Moiseeva E, Rabinowitz C, Paz G, Rinkevich B. Histological study on maturation, fertilization and the state of gonadal region following spawning in the model sea anemone, Nematostella vectensis. PLoS One 2017; 12:e0182677. [PMID: 28796817 PMCID: PMC5552035 DOI: 10.1371/journal.pone.0182677] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 07/22/2017] [Indexed: 12/26/2022] Open
Abstract
The starlet sea-anemone Nematostella vectensis has emerged as a model organism in developmental biology. Still, our understanding of various biological features, including reproductive biology of this model species are in its infancy. Consequently, through histological sections, we study here key stages of the oogenesis (oocyte maturation/fertilization), as the state of the gonad region immediately after natural spawning. Germ cells develop in a secluded mesenterial gastrodermal zone, where the developing oocytes are surrounded by mucoid glandular cells and trophocytes (accessory cells). During vitellogenesis, the germinal vesicle in oocytes migrates towards the animal pole and the large polarized oocytes begin to mature, characterized by karyosphere formation. Then, the karyosphere breaks down, the chromosomes form the metaphase plate I and the eggs are extruded from the animal enclosed in a sticky, jelly-like mucoid mass, along with numerous nematosomes. Fertilization occurs externally at metaphase II via swimming sperm extruded by males during natural spawning. The polar bodies are ejected from the eggs and are situated within a narrow space between the egg's vitelline membrane and the adjacent edge of the jelly coat. The cortical reaction occurs only at the polar bodies' ejection site. Several spermatozoa can penetrate the same egg. Fertilization is accompanied by a strong ooplasmatic segregation. Immediately after spawning, the gonad region holds many previtellogenic and vitellogenic oocytes, though no oocytes with karyosphere. Above are the first histological descriptions for egg maturation, meiotic chromosome's status at fertilization, fertilization and the gonadal region's state following spawning, also documenting for the first time the ejection of the polar body.
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Affiliation(s)
- Elizabeth Moiseeva
- Israel Oceanography and Limnological Research, National Institute of Oceanography, Tel-Shikmona, Haifa, Israel
| | - Claudette Rabinowitz
- Israel Oceanography and Limnological Research, National Institute of Oceanography, Tel-Shikmona, Haifa, Israel
| | - Guy Paz
- Israel Oceanography and Limnological Research, National Institute of Oceanography, Tel-Shikmona, Haifa, Israel
| | - Baruch Rinkevich
- Israel Oceanography and Limnological Research, National Institute of Oceanography, Tel-Shikmona, Haifa, Israel
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Li C, Blencke HM, Haug T, Stensvåg K. Antimicrobial peptides in echinoderm host defense. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2015; 49:190-197. [PMID: 25445901 DOI: 10.1016/j.dci.2014.11.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Revised: 10/02/2014] [Accepted: 11/03/2014] [Indexed: 06/04/2023]
Abstract
Antimicrobial peptides (AMPs) are important effector molecules in innate immunity. Here we briefly summarize characteristic traits of AMPs and their mechanisms of antimicrobial activity. Echinoderms live in a microbe-rich marine environment and are known to express a wide range of AMPs. We address two novel AMP families from coelomocytes of sea urchins: cysteine-rich AMPs (strongylocins) and heterodimeric AMPs (centrocins). These peptide families have conserved preprosequences, are present in both adults and pluteus stage larvae, have potent antimicrobial properties, and therefore appear to be important innate immune effectors. Strongylocins have a unique cysteine pattern compared to other cysteine-rich peptides, which suggests a novel AMP folding pattern. Centrocins and SdStrongylocin 2 contain brominated tryptophan residues in their native form. This review also includes AMPs isolated from other echinoderms, such as holothuroidins, fragments of beta-thymosin, and fragments of lectin (CEL-III). Echinoderm AMPs are crucial molecules for the understanding of echinoderm immunity, and their potent antimicrobial activity makes them potential precursors of novel drug leads.
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Affiliation(s)
- Chun Li
- Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Breivika, N-9037 Tromsø, Norway.
| | - Hans-Matti Blencke
- Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Breivika, N-9037 Tromsø, Norway; Centre for Research-based Innovation on Marine Bioactives and Drug Discovery (MabCent-SFI), UiT The Arctic University of Norway, N-9037 Tromsø, Norway
| | - Tor Haug
- Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Breivika, N-9037 Tromsø, Norway; Centre for Research-based Innovation on Marine Bioactives and Drug Discovery (MabCent-SFI), UiT The Arctic University of Norway, N-9037 Tromsø, Norway
| | - Klara Stensvåg
- Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Breivika, N-9037 Tromsø, Norway; Centre for Research-based Innovation on Marine Bioactives and Drug Discovery (MabCent-SFI), UiT The Arctic University of Norway, N-9037 Tromsø, Norway.
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Li C, Blencke HM, Haug T, Jørgensen Ø, Stensvåg K. Expression of antimicrobial peptides in coelomocytes and embryos of the green sea urchin (Strongylocentrotus droebachiensis). DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2014; 43:106-113. [PMID: 24239709 DOI: 10.1016/j.dci.2013.10.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 10/28/2013] [Accepted: 10/29/2013] [Indexed: 06/02/2023]
Abstract
Antimicrobial peptides (AMPs) play a crucial role in innate immunity. We have previously reported the isolation and characterization of the AMPs, strongylocins 1 and 2, and centrocin 1, from coelomocyte extracts of Strongylocentrotus droebachiensis. Here we show that these AMPs were expressed in phagocytes. In addition, transcripts of strongylocin 1 were detected in vibratile cells and/or colorless spherule cells, while transcripts of strongylocin 2 were found in red spherule cells. Results from immunoblotting and immunocytochemistry studies showed that centrocin 1 was produced by phagocytes and stored in granular vesicles. Co-localization of centrocin 1 and phagocytosed bacteria suggests that the granular vesicles containing centrocin 1 may be involved in the formation of phagolysosomes. We also analyzed the temporal and spatial expression of AMPs throughout larval development. Strongylocins were expressed in the early pluteus stage, while centrocin 1 was expressed in the mid pluteus stage. The spatial expression pattern showed that centrocin 1 was mainly located in blastocoelar cells (BCs) around the stomach and the esophagus. In addition, a few patrolling BCs were detected in some larval arms. Together, these results suggest that AMPs are expressed in different types of coelomocytes and that centrocin 1 is involved in response against bacteria. Furthermore, the expression of AMPs in larval pluteus stage, especially in BCs, indicates that AMPs and BCs are engaged in the larval immune system.
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Affiliation(s)
- Chun Li
- Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, University of Tromsø, Breivika, N-9037 Tromsø, Norway; Centre for Research-based Innovation on Marine Bioactives and Drug Discovery (MabCent-SFI), University of Tromsø, N-9037 Tromsø, Norway.
| | - Hans-Matti Blencke
- Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, University of Tromsø, Breivika, N-9037 Tromsø, Norway; Centre for Research-based Innovation on Marine Bioactives and Drug Discovery (MabCent-SFI), University of Tromsø, N-9037 Tromsø, Norway
| | - Tor Haug
- Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, University of Tromsø, Breivika, N-9037 Tromsø, Norway; Centre for Research-based Innovation on Marine Bioactives and Drug Discovery (MabCent-SFI), University of Tromsø, N-9037 Tromsø, Norway
| | | | - Klara Stensvåg
- Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, University of Tromsø, Breivika, N-9037 Tromsø, Norway; Centre for Research-based Innovation on Marine Bioactives and Drug Discovery (MabCent-SFI), University of Tromsø, N-9037 Tromsø, Norway.
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Cinelli LP, Andrade L, Valente AP, Mourão PAS. Sulfated alpha-L-galactans from the sea urchin ovary: selective 6-desulfation as eggs are spawned. Glycobiology 2010; 20:702-9. [PMID: 20147451 DOI: 10.1093/glycob/cwq017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The sea urchin eggs are surrounded by a jelly coat, which contains sulfated polysaccharides with unique structures. These molecules are responsible for inducing the species-specific acrosome reaction, an obligatory event for the binding of sperm and fusion with the egg. The mechanism of biosynthesis of these sulfated polysaccharides is virtually unknown. The egg jelly of the sea urchin Echinometra lucunter contains a simple 2-sulfated, 3-linked alpha-L-galactan. Here, we pulse labeled the sea urchin ovary in vitro with (35)S-sulfate to follow the biosynthesis of the sulfated alpha-L-galactan. We found that the ovary contains a 2,6-disulfated, 3-linked alpha-L-galactan, which incorporates (35)S-sulfate more avidly than the 2-sulfated isoform. The 2,6-disulfated alpha-L-galactan was purified by anion exchange chromatography, analyzed by electrophoresis and characterized by 1D and 2D nuclear magnetic resonance spectra. We also investigated the location of the sulfated polysaccharides on the oocytes using histochemical procedures. The stain revealed high amounts of sulfated polysaccharide in mature oocytes and accessory cells. The amount of intracellular sulfated polysaccharides decreased as oocytes are spawned. We speculate that 2,6-disulfated galactan is initially synthesized in the ovary and that 6-sulfate ester is removed when the polysaccharide is secreted into the egg jelly. Similar events related to remodeling of sulfated polysaccharides have been reported in other biological systems.
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W Walker C, Unuma T, P Lesser M. Chapter 2 Gametogenesis and reproduction of sea urchins. DEVELOPMENTS IN AQUACULTURE AND FISHERIES SCIENCE 2007. [DOI: 10.1016/s0167-9309(07)80066-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Walker CW, Harrington LM, Lesser MP, Fagerberg WR. Nutritive phagocyte incubation chambers provide a structural and nutritive microenvironment for germ cells of Strongylocentrotus droebachiensis, the green sea urchin. THE BIOLOGICAL BULLETIN 2005; 209:31-48. [PMID: 16110092 DOI: 10.2307/3593140] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Here we characterize the germinal epithelia of both sexes of Strongylocentrotus droebachiensis, the green sea urchin, throughout its annual gametogenic cycle, using light and electron microscopy and cytochemistry. In both sexes, germinal epithelia include two interacting cellular populations: nutritive phagocytes (NPs) and germ cells. After spring spawning, NPs accumulate nutrients; amitotic oogonia and often mitotic spermatogonia occur in clusters beneath NPs; and subsequent gametogenic stages are residual or absent. During the summer, NP nutrients are mobilized for use in vitellogenesis by residual primary oocytes or to support limited spermatogenesis. In addition, some residual primary oocytes may degenerate and be phagocytized by NPs. Significant nutrient mobilization from NPs and substantial gonial cell mitoses (indicative of new gametogenesis) occur in the fall. In both sexes, all of these changes are facilitated by NPs that form basal incubation chambers near the gonadal wall and within which germ cells are surrounded by nutrients released from the NPs. In females, germ cells at several stages of gametogenesis may be housed in separate chambers in the same NP. Primary oocytes also carry out jelly coat formation, meiosis, and cortical granule translocation within NP incubation chambers. In males, many NPs cooperate to provide large continuous chambers that contain spermatogenic cells at diverse stages. In both sexes these chambers persist throughout the year and isolate gametogenesis from the gonadal lumen. NPs become slender and shorten as their nutrients are depleted. Ova or spermatozoa are stored in the gonadal lumen. Post-spawning, NPs phagocytize differentiated germ cells while simultaneously enclosing intact gonial and residual gametogenic cells in basal chambers near the gonadal wall. In light of our observations, we suggest investigating proteins that may be important in the structural, phagocytic, and nutritive functions of NPs and for which corresponding genes have already been identified in the genome of S. purpuratus, the closely related purple sea urchin.
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Affiliation(s)
- Charles W Walker
- Department of Zoology, Marine Biomedical Research Group, Center for Marine Biology, University of New Hampshire, Durham, New Hampshire 03824, USA.
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Abe H, Kinoh H, Suzuki N. Seasonal variations in the production of the egg-jelly macromolecule, a fucose sulphate glycoconjugate, by the accessory cells in the ovary of the sea urchin Hemicentrotus pulcherrimus. ACTA ACUST UNITED AC 1994; 203:402-410. [DOI: 10.1007/bf00188689] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/1993] [Accepted: 01/20/1994] [Indexed: 10/26/2022]
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The egg-jelly macromolecule, a fucose sulphate glycoconjugate, originates from the accessory cells of the ovary in the sea urchin Hemicentrotus pulcherrimus. ACTA ACUST UNITED AC 1992; 201:179-189. [DOI: 10.1007/bf00188717] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/1991] [Accepted: 02/06/1992] [Indexed: 10/26/2022]
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Van Winkle LJ. Amino acid transport in developing animal oocytes and early conceptuses. BIOCHIMICA ET BIOPHYSICA ACTA 1988; 947:173-208. [PMID: 3278739 DOI: 10.1016/0304-4157(88)90024-x] [Citation(s) in RCA: 79] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- L J Van Winkle
- Department of Biochemistry, Chicago College of Osteopathic Medicine, IL 60615
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Amikura RM, Ihnuma M. Fate of argyrophilic proteins during sea-urchin (Hemicentrotus pulcherrimus) oogenesis detected by NOR-silver staining. ACTA ACUST UNITED AC 1984. [DOI: 10.1002/mrd.1120100404] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Jondeung A, Czihak G. Histochemical study of globules in accessory cells of sea-urchin ovary: in relation to jelly coat substance. Acta Histochem 1983; 73:9-15. [PMID: 6195882 DOI: 10.1016/s0065-1281(83)80065-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Accessory cells of the sea-urchin ovary were studied histologically and histochemically. Different types of globules in these cells were distinguished. Histochemical observations suggest that the accessory cells synthesize neutral mucosubstances, sulfo- and sialopolysaccharides, which might be precursors for jelly formation.
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