Document Detail

Microvascularization on collared peccary placenta: a microvascular cast study [corrected] in late pregnancy.
MedLine Citation:
PMID:  22775252     Owner:  NLM     Status:  MEDLINE    
The microvascularization of the collared peccary (Tayassu tajacu) placenta was studied by vascular casts and immunolocalization of α-smooth muscle actin and vimentin, to identify the three dimensional organization and vascular flow interrelation in the microvasculature between the maternal and fetal compartments of the placentae. The immunolocalization of vimentin in the vascular endothelium and in the smooth muscle cells of blood vessels showed indented capillaries along the uterine epithelium and the trophoblast at the sides of complementary maternal and fetal microfolds, or rugae. This confers the three-dimensional structure observed in vascular casts. On the maternal side, casts demonstrated uterine folds coated by with primary and secondary ridges, and by areolae dispersed between these ridges. The arteriole runs through the center/middle of ridges, branching at the top into a microvascular network wall in a basket-like fashion. At the base of these baskets venules were formed. On the fetal side, arterioles branched centrally in the fetal rugae into a capillary network in a bulbous form, complementary to the opposite maternal depressions forming the baskets. At the base of the bulbous protrusions, the fetal venules arise. The blood vessel orientation in the materno-fetal interface of the placentae of collared peccaries suggests a blood flow pattern of the type countercurrent to cross current. The same pattern has been reported in domestic swine demonstrating that, even after 38 million years, the Tayassuidae and Suidae families exhibit similar placental morphology, which is here characterized at the microvascular level.
Tatiana Carlesso Santos; Moacir Franco Oliveira; Vibeke Dantzer; Maria Angélica Miglino
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Zoological science     Volume:  29     ISSN:  0289-0003     ISO Abbreviation:  Zool. Sci.     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-07-10     Completed Date:  2012-09-06     Revised Date:  2012-09-10    
Medline Journal Info:
Nlm Unique ID:  8702287     Medline TA:  Zoolog Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  437-43     Citation Subset:  IM    
Department of Animal Science, State University of Maringá, Paraná, Brazil.
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MeSH Terms
Actins / genetics,  metabolism
Artiodactyla / anatomy & histology*,  physiology*
Fetus / blood supply
Gene Expression Regulation
Neovascularization, Physiologic / physiology
Placenta / blood supply*,  ultrastructure
Vimentin / genetics,  metabolism
Reg. No./Substance:
0/Actins; 0/Vimentin
Erratum In:
Zoolog Sci. 2012 Aug;29(8):546

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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