Placentation in the paca (Agouti paca L)

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dc.contributor.authorBonatelli, M.
dc.contributor.authorCarter, A. M.
dc.contributor.authorMachado, MRF
dc.contributor.authorDe Oliveira, M. F.
dc.contributor.authorde Lima, M. C.
dc.contributor.authorMiglino, M. A.
dc.contributor.institutionUniv So Denmark
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionMossoro Super Sch Agr
dc.date.accessioned2014-05-20T15:30:12Z
dc.date.available2014-05-20T15:30:12Z
dc.date.issued2005-02-28
dc.description.abstractBackground: the paca is a South American rodent with potential as a commercial food animal. We examined paca placenta as part of a wider effort to understand the reproductive biology of this species.Methods: Thirteen specimens between midgestation and term of pregnancy were studied by light and transmission electron microscopy.Results: the placenta is divided into several lobes separated by interlobular trophoblast. Maternal arterial channels and fetal veins are found at the centre of each lobe. In the labyrinth, maternal blood flows through trophoblast-lined lacunae in close proximity to the fetal capillaries. The interhaemal barrier is of the haemomonochorial type with a single layer of syncytiotrophoblast. Caveolae occur in the apical membrane of the syncytiotrophoblast and recesses in the basal membrane, but there is no evidence of transtrophoblastic channels. The interlobular areas consist of cords of syncytiotrophoblast defining maternal blood channels that drain the labyrinth. Yolk sac endoderm covers much of the fetal surface of the placenta. The subplacenta comprises cytotrophoblast and syncytiotrophoblast. There are dilated intercellular spaces between the cytotrophoblasts and lacunae lined by syncytiotrophoblast. In the junctional zone between subplacenta and decidua, there are nests of multinucleated giant cells with vacuolated cytoplasm. The entire placenta rests on a pedicle of maternal tissue. An inverted yolk sac placenta is also present. The presence of small vesicles and tubules in the apical membrane of the yolk sac endoderm and larger vesicles in the supranuclear region suggest that the yolk sac placenta participates in maternal-fetal transfer of protein.Conclusion: the paca placenta closely resembles that of other hystricomorph rodents. The lobulated structure allows for a larger exchange area and the development of precocial young.en
dc.description.affiliationUniv So Denmark, Dept Physiol & Pharmacol, Odense, Denmark
dc.description.affiliationUniv São Paulo, Sch Vet Med, Dept Surg, São Paulo, Brazil
dc.description.affiliationPaulista State Univ, São Paulo, Brazil
dc.description.affiliationMossoro Super Sch Agr, Natal, RN, Brazil
dc.description.affiliationUnespPaulista State Univ, São Paulo, Brazil
dc.format.extent12
dc.identifierhttp://dx.doi.org/10.1186/1477-7827-3-9
dc.identifier.citationReproductive Biology and Endocrinology. London: Biomed Central Ltd., v. 3, 12 p., 2005.
dc.identifier.doi10.1186/1477-7827-3-9
dc.identifier.fileWOS000231286400001.pdf
dc.identifier.issn1477-7827
dc.identifier.urihttp://hdl.handle.net/11449/39635
dc.identifier.wosWOS:000231286400001
dc.language.isoeng
dc.publisherBiomed Central Ltd.
dc.relation.ispartofReproductive Biology and Endocrinology
dc.relation.ispartofjcr2.852
dc.relation.ispartofsjr1,203
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.titlePlacentation in the paca (Agouti paca L)en
dc.typeArtigo
dcterms.licensehttp://www.biomedcentral.com/about/reprintsandperm
dcterms.rightsHolderBiomed Central Ltd.
unesp.author.orcid0000-0002-8359-2085[2]

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