| Placental function in two distantly related marsupials. | |
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MedLine Citation:
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PMID: 16750267 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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C Freyer; U Zeller; M B Renfree |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2006-06-05 |
Journal Detail:
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Title: Placenta Volume: 28 ISSN: 0143-4004 ISO Abbreviation: Placenta Publication Date: 2007 Feb-Mar |
Date Detail:
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Created Date: 2006-12-22 Completed Date: 2007-03-28 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8006349 Medline TA: Placenta Country: England |
Other Details:
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Languages: eng Pagination: 249-57 Citation Subset: IM |
Affiliation:
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Department of Zoology, The University of Melbourne, Victoria 3010, Australia. claudia.freyer@princehenrys.org |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Carbohydrate Metabolism Endometrium / anatomy & histology, metabolism*, secretion Female Ferric Compounds / metabolism Glycoproteins / metabolism Lipid Metabolism Macropodidae / anatomy & histology, physiology* Male Monodelphis / anatomy & histology, physiology* Placenta / physiology Pregnancy / physiology* Proteins / metabolism, secretion Urea / metabolism Yolk Sac / physiology* |
| Chemical | |
Reg. No./Substance:
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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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