Exocrine glands of Lepeophtheirus salmonis (Copepoda: Caligidae): Distribution, developmental appearance, and site of secretion
Identifieur interne : 000C40 ( Main/Exploration ); précédent : 000C39; suivant : 000C41Exocrine glands of Lepeophtheirus salmonis (Copepoda: Caligidae): Distribution, developmental appearance, and site of secretion
Auteurs : Aina-Cathrine Verg Rd [Norvège] ; Lars A. Hamre [Norvège] ; Ewa Harasimczuk [Norvège] ; Sussie Dalvin [Norvège] ; Frank Nilsen [Norvège] ; Sindre Grotmol [Norvège]Source :
- Journal of Morphology [ 0362-2525 ] ; 2016-12.
Abstract
Exocrine glands of blood‐feeding parasitic copepods are believed to be important in host immune response modulation and inhibition of host blood coagulation, but also in the production of substances for integument lubrication and antifouling. In this study, we aimed to characterize the distribution of different types of salmon louse (Lepeophtheirus salmonis) exocrine glands and their site of secretion. The developmental appearance of each gland type was mapped and genes specifically expressed by glands were identified. Three types of tegumental (teg 1–3) glands and one labial gland type were found. The first glands to appear during development were teg 1 and teg 2 glands. They have ducts extending both dorsally and ventrally suggested to be important in lubricating the integument. Teg 1 glands were found to express two astacin metallopeptidases and a gene with fibronectin II domains, while teg 2 glands express a heme peroxidase. The labial glands were first identified in planktonic copepodids, with reservoirs that allows for storage of glandular products. The last gland type to appear during development was named teg 3 and was not seen before the preadult I stage when the lice become more virulent. Teg 3 glands have ducts ending ventrally at the host‐parasite contact area, and may secrete substances important for the salmon lice virulence. Salmon lice teg 3 and labial glands are thus likely to be especially important in the host‐parasite interaction. Proteins secreted from the salmon louse glands to its salmonid host skin or blood represents a potential interface where the host immune system can meet and elicit effective responses to sea lice antigens. The present study thus represents a fundamental basis for further functional studies and identification of possible vaccine candidates. J. Morphol. 277:1616–1630, 2016. © 2016 Wiley Periodicals, Inc.
Url:
DOI: 10.1002/jmor.20611
Affiliations:
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In this study, we aimed to characterize the distribution of different types of salmon louse (Lepeophtheirus salmonis) exocrine glands and their site of secretion. The developmental appearance of each gland type was mapped and genes specifically expressed by glands were identified. Three types of tegumental (teg 1–3) glands and one labial gland type were found. The first glands to appear during development were teg 1 and teg 2 glands. They have ducts extending both dorsally and ventrally suggested to be important in lubricating the integument. Teg 1 glands were found to express two astacin metallopeptidases and a gene with fibronectin II domains, while teg 2 glands express a heme peroxidase. The labial glands were first identified in planktonic copepodids, with reservoirs that allows for storage of glandular products. The last gland type to appear during development was named teg 3 and was not seen before the preadult I stage when the lice become more virulent. Teg 3 glands have ducts ending ventrally at the host‐parasite contact area, and may secrete substances important for the salmon lice virulence. Salmon lice teg 3 and labial glands are thus likely to be especially important in the host‐parasite interaction. Proteins secreted from the salmon louse glands to its salmonid host skin or blood represents a potential interface where the host immune system can meet and elicit effective responses to sea lice antigens. The present study thus represents a fundamental basis for further functional studies and identification of possible vaccine candidates. J. Morphol. 277:1616–1630, 2016. © 2016 Wiley Periodicals, Inc.</div></front></TEI><affiliations><list><country><li>Norvège</li></country></list><tree><country name="Norvège"><noRegion><name sortKey=" Verg Rd, Aina Athrine" sort=" Verg Rd, Aina Athrine" uniqKey=" Verg Rd A" first="Aina-Cathrine" last=" Verg Rd">Aina-Cathrine Verg Rd</name></noRegion><name sortKey=" Verg Rd, Aina Athrine" sort=" Verg Rd, Aina Athrine" uniqKey=" Verg Rd A" first="Aina-Cathrine" last=" Verg Rd">Aina-Cathrine Verg Rd</name><name sortKey=" Verg Rd, Aina Athrine" sort=" Verg Rd, Aina Athrine" uniqKey=" Verg Rd A" first="Aina-Cathrine" last=" Verg Rd">Aina-Cathrine Verg Rd</name><name sortKey="Dalvin, Sussie" sort="Dalvin, Sussie" uniqKey="Dalvin S" first="Sussie" last="Dalvin">Sussie Dalvin</name><name sortKey="Grotmol, Sindre" sort="Grotmol, Sindre" uniqKey="Grotmol S" first="Sindre" last="Grotmol">Sindre Grotmol</name><name sortKey="Hamre, Lars A" sort="Hamre, Lars A" uniqKey="Hamre L" first="Lars A." last="Hamre">Lars A. 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