Placentation and fetal membrane development in the South American coati, Nasua nasua (Mammalia, Carnivora, Procyonidae)

Reproductive Biology and Endocrinology

Carlos E Ambrósio¹  Maria A Miglino²  Andrea M Mess²  João C Morini²  Phelipe O Favaron² 

[1] Department of Veterinary Medicine, FZEA, University of São Paulo, Av. Duque de Caxias Norte, 225, ZMV, 13635-900 Pirassununga, SP, Brazil;Department of Surgery, School of Veterinary Medicine and Animal Science, University of Sao Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, Cidade Universitária, 05508-270 São Paulo, SP, Brazil

关键词: Yolk sac;    Hemophagous organ;    Endotheliochorial placenta;    Carnivore;   

Others  :  1149553
DOI  :  10.1186/1477-7827-12-57

 received in 2014-04-08, accepted in 2014-06-14,  发布年份 2014

【 摘 要 】

Background

Placental research in carnivores has concentrated on domestic species, which have zonary, labyrinthine placentas with an endotheliochorial barrier. Although the coati, Nasua nasua, is a widely distributed species in South America, data on the development of the placenta and the fetal membranes in this species are very sparse.

Findings

Four placentas from mid-gestation to near term were collected from wild individuals and were investigated based on gross morphology, histology, immunohistochemistry and electron microscopy. The available data support the concept that the ancestral condition of placentation in carnivores is phylogenetically characterized by a zonary and labyrinthine placental type with an endotheliochorial fetomaternal barrier, comprising extended epitheliochorial and haemochorial zones, such as hemophagous organs for iron supply and histiotrophe uptake and a yolk sac placenta.

Conclusions

Because of the foundational mechanisms that lead to the considerable complexity of fetomaternal contact zones in carnivores have not been studied, carnivores are interesting animal models for interhaemal barrier differentiation.

【 授权许可】

   
2014 Favaron et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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