Macroscopic and Microscopic Aspects of Collared Peccary and White-lipped Peccary Placenta

Santos, T. C.; Dantzer, V.; Jones, Carolyn J.P.; Oliveira, Moacir Franco de; Miglino, María Angélica

doi:10.1016/j.placenta.2005.02.017

Cited by 9 publications

(9 citation statements)

References 37 publications

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“…Generally speaking, the morphological and histochemical characteristics of the areolae in our study were very similar to those described in peccaries (Santos 2006), sows (Dantzer 1984) and alpacas (Olivera 2002, Olivera et al 2003a. The classification of regular and irregular areolae as observed in sows was not found in the llama (Abd-Elnaeim et al 2003).…”

Section: Discus Discus Discus Discus Discussion Sion Sion Sion Sionsupporting

confidence: 85%

“…The classification of regular and irregular areolae as observed in sows was not found in the llama (Abd-Elnaeim et al 2003). In sows there is a system of specific vessels for the areolae, suggesting that this system is important for maintaining the transfer of substances in the areolae, as well as their secretion, metabolism and absorption (Dantzer 1984, Danzer & Leiser 1993, Santos 2006.…”

Section: Discus Discus Discus Discus Discussion Sion Sion Sion Sionmentioning

confidence: 99%

“…Another characteristic shared by many epitheliochorial placentae is the presence of areolae on the surface of the chorium, as found in swine (Dantzer 1984), equines (Ginther 1992), peccaries (Santos et al 2006), and camelids (Abd-Elnaeim 2003) among others. They are related to the opening of one or more (Leiser & Dantzer 1988) uterine glands responsible for the secretion of glycoproteins, including uteroferrin (Roberts et al 1986).…”

Section: Introduction Introduction Introduction Introduction Introducmentioning

confidence: 99%

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The materno-fetal interface in llama (Lama guanicoe glama)

et al. 2007

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Samples from 9 llamas (28 through 36 weeks of gestation) were collected and fixed in 4% buffered paraformaldehyde (light microscopy) and in 2.5% buffered glutaraldehyde (transmission and scanning electron microscopy). The material was processed in paraplast and slides (5mm) were stained with HE, PAS, Masson-Trichrome, acid phosphatase and Perl's. The uteroferrin was immunolocalized. The results show that llama placenta is chorioallantoic, diffuse, folded and epitheliochorial, and the fetus is covered with an epidermal membrane. The trophoblast cells have variable morphology: cubic, rounded and triangular cells, with cytoplasm containing PAS-positive granules. Binucleated cells with large cytoplasm and rounded nuclei, as well as giant trophoblastic cells with multiple nuclei were also observed. Numerous blood vessels were observed beneath the cells of the uterine epithelium and around the chorionic subdivided branches. Glandular activity was shown by PAS, Perl's, and acid phosphatase positive reactions in the cytoplasm and glandular lumen, and by immunolocalization of the uteroferrin in the glandular epithelium. The uterine glands open in spaces formed by the areoles, which are filled by PAS-positive material. The llama fetus was covered by the epidermal membrane, composed of stratified epithelium, with up to seven layers of mono-, bi- or trinucleated cells. The high level of maternal and fetal vascularization surfaces indicates an intense exchange of substances across both surfaces. The metabolic activity shown in the uterine glands suggests an adaptation of the gestation to the high altitudes of the natural habitat of this species.

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Section: Discus Discus Discus Discus Discussion Sion Sion Sion Sionsupporting

confidence: 85%

Section: Discus Discus Discus Discus Discussion Sion Sion Sion Sionmentioning

confidence: 99%

Section: Introduction Introduction Introduction Introduction Introducmentioning

confidence: 99%

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The materno-fetal interface in llama (Lama guanicoe glama)

et al. 2007

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“…The typical capillary indentation on both sides of the placental barrier that occurs in pigs [26,27] has also been observed in the placentas of Tayassuidae [1]. These characteristics appear to be common to other suiforms, as Macdonald and Fowden [28] described that the microscopic anatomy of placenta of the genus Sus, Hylochoerus, Babyrousa, Phacochoerus, and Pecari is similar to that of domestic pigs.…”

Section: Introductionmentioning

confidence: 85%

“…The collared peccary (Pecari tajacu) is a mammal that belongs to the same order as large ruminants and to the same family as the domestic swine and has a diffuse, folded, epitheliochorial, chorioallantoic placenta with an areolar gland complex [1]. The peccaries are polytocous with a gestation periods of 144 to 148 days and normally with 2 offspring per parturition [2].…”

Section: Introductionmentioning

confidence: 99%

VEGF system expression by immunohistochemistry and real-time RT-PCR study on collared peccary placenta

et al. 2014

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Evolution of Suiform Aromatases: Ancestral Duplication with Conservation of Tissue-Specific Expression in the Collared Peccary (Pecari tayassu)

et al. 2007

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Aromatase cytochrome P450 (P450arom), the enzyme that catalyzes estrogen synthesis, is required for successful reproduction and is encoded by a single copy gene (CYP19) in most mammals. However, pigs and their distant suiform relatives the peccaries experienced CYP19 duplication. Here, the evolutionary origin of CYP19 duplication, and the evolution of the gene paralogs, was explored further in collared peccaries (Pecari tayassu). Exons IV and V, and the intervening intron, representing duplicated CYP19 genes, were cloned and sequenced from collared peccary, pig, and hippopotamus. Sequence alignment and analysis identified a gene conversion in collared peccary with a breakpoint 102 base pairs (bp) upstream of exon V. Phylogenetic analyses of nucleotide and amino acid sequence upstream of the breakpoint supported a tree in which one peccary sequence was orthologous with the porcine gonadal gene. Cloning and sequencing of tissue transcripts, using reverse-transcriptase polymerase chain reaction techniques (RT-PCR), confirmed that the gonadal ortholog was expressed in collared peccary testis. Orthology of the other genomic sequence with the porcine placental gene was not resolved, but its placenta-specific expression in collared peccary was confirmed by similar transcript analysis. Immunoblot and enzyme activity in collared peccary testes demonstrated much lower levels of P450arom than in pig testis. Collared peccary placental P450arom expression also seemed much lower than pigs. Thus, suiform CYP19 genes arose from an ancestral duplication that has maintained gonad- and placenta-specific expression, but at lower levels in peccaries than pigs, perhaps facilitating the emergence of different reproductive strategies as Suiformes diverged and evolved.

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Macroscopic and Microscopic Aspects of Collared Peccary and White-lipped Peccary Placenta

Cited by 9 publications

References 37 publications

The materno-fetal interface in llama (Lama guanicoe glama)

The materno-fetal interface in llama (Lama guanicoe glama)

VEGF system expression by immunohistochemistry and real-time RT-PCR study on collared peccary placenta

Evolution of Suiform Aromatases: Ancestral Duplication with Conservation of Tissue-Specific Expression in the Collared Peccary (Pecari tayassu)

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