Document Detail

Expression of vascular endothelial growth factor and endothelial nitric oxide synthase is increased in the placenta of sheep at high altitude in the Andes.
MedLine Citation:
PMID:  20885843     Owner:  NLM     Status:  MEDLINE    
Fetal weight and the placenta of sheep at high altitude (HA) are affected by hypoxia. Placental changes (an increase in placental size and vascularization) are greater in ewes from populations that have lived for several generations at HA than in those exposed during just 1 gestation. This study investigated placental expression of vascular endothelial growth factor (VEGF) and endothelial nitric oxide synthase (eNOS), 2 molecules involved in placental angiogenesis that could be upregulated by hypoxia. Two groups of ewes were maintained at HA (3589 m) during pregnancy: HA-native ewes (group HH) and ewes native to lowlands but moved to HA immediately after the diagnosis of pregnancy (group LH). A control group (LL) was kept at sea level. Near term, placentomes were removed, weighed, and processed for immunohistochemical detection of VEGF and eNOS, as well as for vascular area measurement. Placental weight was significantly higher in the HH group than in the LH and LL groups; between the latter 2 groups there was no significant difference. The placental area occupied by vasculature was significantly greater in both the HA groups than in the LH group; the number of placentomes was greatest in the LL group. The density of VEGF and eNOS in the placentome tissue was significantly greater in both HA groups than in the LL group. Although the density of VEGF was significantly lower in the HH group than in the LH group, no differences were observed in eNOS density between the HH and LH animals. These results demonstrate that chronic hypoxia upregulates the expression of placental VEGF and eNOS, suggesting an important role of these molecules in the placental response to HA hypoxia. In addition, an attenuated response to hypoxia in VEGF synthesis may be part of the long-term process of adaptation to HA.
Víctor H Parraguez; Miljenko A Atlagich; Bessie Urquieta; Marco Galleguillos; Mónica De Los Reyes; David L Kooyman; Silvia Araneda; Luis A Raggi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Canadian journal of veterinary research = Revue canadienne de recherche vétérinaire     Volume:  74     ISSN:  0830-9000     ISO Abbreviation:  Can. J. Vet. Res.     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-10-01     Completed Date:  2011-01-19     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  8607793     Medline TA:  Can J Vet Res     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  193-9     Citation Subset:  IM    
Faculty of Veterinary Sciences and International Center for Andean Studies, University of Chile, Casilla 2, Correo 15, La Granja, Santiago, Chile.
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MeSH Terms
Blood Gas Analysis
Fetal Development
Gene Expression Regulation, Enzymologic / physiology*
Nitric Oxide Synthase Type III / genetics,  metabolism*
Placenta / metabolism*
Vascular Endothelial Growth Factor A / genetics,  metabolism*
Reg. No./Substance:
0/Vascular Endothelial Growth Factor A; EC Oxide Synthase Type III

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

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