| Effects of dehydration on cardiovascular development in the embryonic American alligator (Alligator mississipiensis). | |
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MedLine Citation:
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PMID: 22484708 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Effects of dehydration on reptilian embryonic cardiovascular function are unknown. Here, we present the first morphological and physiological data quantifying the cumulative effects of four acute dehydration events on the embryonic American alligator, Alligator mississipiensis. We hypothesized that dehydration would alter embryonic morphology, reduce blood volume and augment the response to angiotensin II (Ang II), a key osmotic and blood volume regulatory response element in adult vertebrates. Drying events at 30%, 40%, 50%, and 60% of embryonic incubation reduced total egg water content by 14.43 ± 0.37 g, a 3.4 fold increase relative to controls. However, embyronic blood volume was greater in the dehydration group at 70% of embryonic incubation compared to controls (0.39 ± 0.044 mLg(-1) and 0.22 ± 0.03 mLg(-1), respectively), however, both groups were similar at 90% of incubation (0.18 ± 0.02 mLg(-1) in the controls and 0.23 ± 0.03 mLg(-1) in the dehydrated group). Dehydration altered the morphological phenotype and resulted in an overall reduction in embryonic mass at both incubation time points measured. Dehydration also altered the physiological phenotype, resulting in embryonic alligators that were relatively bradycardic at 90% of incubation. Arterial Ang II injections resulted in a dose dependent hypertension, which increased in intensity over the span of incubation studied. While progressive incubation altered the Ang II response, dehydration had no impact on the cardiovascular responses to the peptide. Quantification of Ang II type-1 receptor protein using western blot analysis illustrated that dehydration condition and incubation time point did not alter protein quantity. Collectively, our results show that dehydration during embryonic development of the American alligator alters embryonic morphology and baseline heart rate without altering arterial pressure and response to Ang II. |
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Authors:
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Kevin B Tate; John Eme; Justin Swart; J Michael Conlon; Dane A Crossley |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. Date: 2012-03-29 |
Journal Detail:
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Title: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology Volume: 162 ISSN: 1531-4332 ISO Abbreviation: Comp. Biochem. Physiol., Part A Mol. Integr. Physiol. Publication Date: 2012 Jul |
Date Detail:
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Created Date: 2012-05-07 Completed Date: 2012-09-07 Revised Date: 2012-09-19 |
Medline Journal Info:
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Nlm Unique ID: 9806096 Medline TA: Comp Biochem Physiol A Mol Integr Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 252-8 Citation Subset: IM |
Copyright Information:
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Copyright © 2012 Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Biological Sciences, University of North Texas, Denton, TX 76203, USA. kevintate@my.unt.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Alligators and Crocodiles
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embryology*,
metabolism Angiotensin II / pharmacology Animals Blood Pressure / drug effects, physiology Blood Volume / drug effects, physiology Cardiovascular System / drug effects, embryology*, metabolism Dehydration / embryology, metabolism, physiopathology* Female Heart Rate / drug effects, physiology Hypertension / chemically induced, embryology, metabolism, physiopathology Receptor, Angiotensin, Type 1 / metabolism Zygote / growth & development, metabolism, physiology |
| Chemical | |
Reg. No./Substance:
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0/Receptor, Angiotensin, Type 1; 11128-99-7/Angiotensin II |
| Comments/Corrections | |
Erratum In:
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Comp Biochem Physiol A Mol Integr Physiol. 2012 Sep;163(1):174-6 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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