Document Detail

Placental function in two distantly related marsupials.
MedLine Citation:
PMID:  16750267     Owner:  NLM     Status:  MEDLINE    
The biochemical composition of uterine and fetal fluids during pregnancy of the grey short-tailed opossum was compared with new and published data on the tammar wallaby. In the grey short-tailed opossum, there are three main phases of embryonic nourishment. During the first phase, the embryo obtains nutrients from uterine secretion transferred into the yolk sac. The amount of uterine secretion declines during the second phase up to the time of shell coat rupture. As a result, the protein concentration in yolk sac fluid also declines. During phase three, which begins with shell coat rupture, nutrients are predominantly available from the maternal blood. In the grey short-tailed opossum that lacks a vesicular, fluid-filled allantois, waste products such as urea are apparently stored in the yolk sac and from there pass into the maternal circulation across the invasive yolk sac placenta. In contrast, in the tammar wallaby, the main source of nutrients available to the late term fetus is glandular secretion that is complemented by substances from the maternal circulation via the chorio-vitelline placenta, and waste products are stored in the large, fluid-filled allantois.
C Freyer; U Zeller; M B Renfree
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-06-05
Journal Detail:
Title:  Placenta     Volume:  28     ISSN:  0143-4004     ISO Abbreviation:  Placenta     Publication Date:    2007 Feb-Mar
Date Detail:
Created Date:  2006-12-22     Completed Date:  2007-03-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8006349     Medline TA:  Placenta     Country:  England    
Other Details:
Languages:  eng     Pagination:  249-57     Citation Subset:  IM    
Department of Zoology, The University of Melbourne, Victoria 3010, Australia.
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MeSH Terms
Carbohydrate Metabolism
Endometrium / anatomy & histology,  metabolism*,  secretion
Ferric Compounds / metabolism
Glycoproteins / metabolism
Lipid Metabolism
Macropodidae / anatomy & histology,  physiology*
Monodelphis / anatomy & histology,  physiology*
Placenta / physiology
Pregnancy / physiology*
Proteins / metabolism,  secretion
Urea / metabolism
Yolk Sac / physiology*
Reg. No./Substance:
0/Ferric Compounds; 0/Glycoproteins; 0/Proteins; 57-13-6/Urea

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

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