Placentation in dolphins from the Amazon River Basin: the Boto, Inia geoffrensis, and the Tucuxi, Sotalia fluviatilis

Silva, Vera Maria Ferreira da; Carter, Anthony Michael; Ambrósio, Carlos Eduardo; Carvalho, Ana Flávia de; Bonatelli, Marina; Lima, Margareth Guimarães; Miglino, María Angélica

doi:10.1186/1477-7827-5-26

Cited by 21 publications

(17 citation statements)

References 36 publications

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“…The surface accretions were plaques of squamous metaplasia. They were invested with stratified squamous epithelium in accordance to da Silva et al (2007) in placentation in Dolphins and Carter et al (2008) when described that the amnion in Amazonian manatee (Trichechus inunguis) showed the inner surface was lined by simple squamous epithelium. The outer surface was covered by stratified squamous epithelium with regions of squamous metaplasia.…”

Section: Microscopymentioning

confidence: 99%

Morphological aspects of buffaloes (Bubalus bubalis) umbilical cord

et al. 2009

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RESUMO.-[Aspectos Morfológicos do cordão umbilical de búfalos (Bubalus bubalis).]Búfalo é uma importante fonte de recurso nos rebanhos animais, apresentando uma grande participação na agropecuária, provendo leite, carne e força de trabalho. O Cordão umbilical é responsável pela troca de nutrientes materno-fetais durante a gestação, e suas alterações podem comprometer o desenvolvimento fetal. Nós investigamos dez úteros gravídicos de búfalos de raças cruzadas em fases diferentes de gestação. O período de gestação e a idade fetal foram determinados pelo comprimento ápice sacral, aplicando fórmulas previamente estabelecidas. Posteriormente mediu-se o comprimento do cordão umbilical. A rede vascular do cordão umbilical e anastomoses foram observadas por injeção ou látex de neoprene. O cordão umbilical foi estudado a partir de cortes histológicos, corados por HE, picrossirius, azul de Toluidina, orceína e reação histoquímica de PAS. O cordão umbilical de bú-falos é formado por duas artérias centrais, ducto alantóide e duas veias periféricas e apresentam forma de ampulheta. A parede da artéria umbilical é composta por grande quan- Buffalo is an important livestock resource, with a great participation in agricultural systems, providing milk, meat, and work power. Umbilical cord is responsible for maternalfetal nutrients exchange during pregnancy, and its alterations can compromise the fetal development. We investigated ten pregnant uteruses collected from cross-bread buffaloes in different stages of gestation. Pregnancy and fetal age was determined by measuring the apex sacral length and development period was calculated by previously published formula. Umbilical cords were measured for length determination. Umbilical cord vascular net and anastomosis were observed by injection of Neoprene latex. Histological sections of the umbilical cord were studied after stain with HE, picrossirius, toluidine blue, orceine, and PAS reaction. Buffaloes' umbilical cord was formed by two central arteries, an allantois duct and two peripheral veins. The artery wall was composed by large quantity of collagen, elastic fibers, fibroblasts and large number of vasa vasorum. The allantois duct was located between the arteries and presented a great number of small nourishing vessels. Small nourishing vessels should be carefully considered to avoid to be mistaken to the arterials and veins vasa vasorum. Medium length of umbilical cord from buffalos was 11.8cm (minimum of 6.8cm and maximum of 17.4cm).

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Section: Microscopymentioning

confidence: 99%

Morphological aspects of buffaloes (Bubalus bubalis) umbilical cord

et al. 2009

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“…3.The black plaques consist of keratinizing squamous epithelium and keratin debris with melanin deposition (arrows).). These plaques composed of squamous metaplasia (amniotic pearls or callosities) are regarded as normal umbilical cord structures in cetacean and ungulates [3, 8, 11]. No histopathological abnormalities including necrosis or hemorrhage were observed in the umbilical cord.…”

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A Case of Meconium Aspiration Syndrome in a Bottlenose Dolphin (<i>Tursiops truncatus</i>) Calf

et al. 2014

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Stillbirth and neonatal mortality are significant problems in captive breeding of dolphins, however, the causes of these problems are not fully understood. Here, we report a case of meconium aspiration syndrome (MAS) in a male neonate of bottlenose dolphin (Tursiops truncates) who died immediately after birth. At necropsy, a true knot was found in the umbilical cord. The lungs showed diffuse intraalveolar edema, hyperemic congestion and atelectasis due to meconium aspiration with mild inflammatory cell infiltration. Although the exact cause of MAS in this case was unknown, fetal hypoxia due possibly to the umbilical knot might have been associated with MAS, which is the first report in dolphins. MAS due to perinatal asphyxia should be taken into account as a possible cause of neonatal mortality and stillbirth of dolphin calves.

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“…Like humans, squamous metaplasia is a regular feature of the mature amnion in many other species. It has been found in cattle [31], whales and sheep [35], and dolphins [36]. This study reported the first cases of squamous metaplasia of the bubaline amnion.…”

Section: Discussionmentioning

confidence: 65%

Bovine Papillomavirus Type 2 Infection Associated with Papillomatosis of the Amniotic Membrane in Water Buffaloes (Bubalus bubalis)

et al. 2020

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Multiple papillomatous nodules were observed scattered over the amniotic membrane in six water buffaloes that had recently aborted. Grossly, some of the nodules had multiple villous projections while others appeared as single prominent conical or cylindrical horns. Histology revealed folded hyperplastic and hyperkeratotic epithelium supported by a narrow fibro-vascular stalk. Using PCR, sequences of the bovine Deltapapillomavirus type 2 (BPV-2) E5 gene were amplified from the amniotic papillomas. Furthermore, expression of the E5 gene was detected using reverse transcription (RT)-PCR. Western blotting revealed BPV-2 E5 oncoprotein as well as L1 protein, suggesting both abortive and productive infection. Additionally, a functional complex composed of BPV-2 E5 oncoprotein and the phosphorylated PDGFβR was detected, which is consistent with the activation of PDGFβR by the interaction with BPV-2 E5 oncoprotein. These results demonstrate that BPV-2 can infect the amnion of water buffaloes and suggest that this infection may cause proliferation of the epithelial cells of the amnion. While the precise pathogenesis in uncertain, it is possible that BPV-2 infection of stratified squamous epithelial cells within squamous metaplasia foci and/or amniotic plaques could lead to papilloma formation. Papillomavirus-associated amniotic papillomas have not previously been reported in any species, including humans.

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Placentation in dolphins from the Amazon River Basin: the Boto, Inia geoffrensis, and the Tucuxi, Sotalia fluviatilis

Cited by 21 publications

References 36 publications

Morphological aspects of buffaloes (Bubalus bubalis) umbilical cord

Morphological aspects of buffaloes (Bubalus bubalis) umbilical cord

A Case of Meconium Aspiration Syndrome in a Bottlenose Dolphin (<i>Tursiops truncatus</i>) Calf

Bovine Papillomavirus Type 2 Infection Associated with Papillomatosis of the Amniotic Membrane in Water Buffaloes (Bubalus bubalis)

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