Comparación morfológica entre el útero fetal y el útero adulto de la alpaca (Vicugna pacos) y la llama (Lama glama)

Mendoza, Galy; Echevarría, Luisa; Llerena, Cielo; Castro, Alejandra; Domínguez, M. J.; Gómez, Susana; Ghezzi, Marcelo Daniel; Barbeito, Claudio Gustavo

doi:10.20453/stv.2013.103

Cited by 1 publication

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“…In different mammals, including camelids, macroscelides, cervids, pholidotas, glossophagine bats, and scandentia, the uterus has particular areas in which the development, growth, and survival of the embryo/fetus take place (Hayssen & Orr, 2017; Jones et al, 2019; Mendoza et al, 2013). In L. maximus , the implantation sites analyzed in this study were located between the cranial and caudal uterine segments.…”

Section: Discussionmentioning

confidence: 99%

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Prenatal development in Lagostomus maximus (Rodentia, Chinchillidae): A unique case among eutherian mammals of physiological embryonic death

Acuña

Barbeito

Portiansky

et al. 2021

Journal of Morphology

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Embryonic death followed by resorption is a conserved process in mammals. Among the polyovular species, Lagostomus maximus (plains viscacha) constitutes a model of early and physiological embryonic death, since out of a total of 10–12 implants, 8–10 are resorbed during early/intermediate gestation, surviving are only the most caudal implantations of each uterine horn. This regular reproductive event is unique to this species, but many characteristics of the implantations during the early gestation of L. maximus, when embryonic death processes begin are unknown. The aim of the present work was to analyze the implantation sites of this species using morphological, morphometric, histochemical, lectinhistochemical, and immunohistochemical techniques to infer the possible causes of this event. Macroscopically, the length and width of the implantation sites significantly increased in a craniocaudal direction. Histochemically, the implantation sites did not differ in the expression of glycoconjugates and glycosidic residues. Furthermore, no variations were observed in cell renewal, hormone receptor expression, and decidualization. Both the glandular and vascular areas of the implantation sites significantly increased in the craniocaudal axis. Some necrotic cells and an inflammatory response with a predominance of lymphocytes and fibrin were observed in the cranial and middle but not in the caudal implantation sites. We conclude that signs of embryonic death and resorption are already observed in the early gestation of L. maximus. Our results reaffirm the hypothesis that postulates the key potential role of uterine glands and blood vessels in the gestation of the species, with emphasis on embryonic death. This pattern of embryonic death in L. maximus makes this species an unconventional mammalian model, which adds to the peculiarities of polyovulation (200–800 oocytes/estrus) and hemochorial placentation.

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Section: Discussionmentioning

confidence: 99%

“…In the first species, it was found that the vasculature is more developed in the left horn from prenatal and even postnatal life. This horn is the site where implantation occurs (Mendoza et al, 2013). In the second species, the right horn is the most vascularized (Jones et al, 2019).…”

Section: Discussionmentioning

confidence: 99%