| Digestion under Duress: Nutrient Acquisition and Metabolism during Hypoxia in the Pacific Hagfish. | |
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MedLine Citation:
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PMID: 22030853 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Abstract Hagfish feed by immersing themselves in the body cavities of decaying animals. This ensures a rich nutrient source for absorption via the gills, skin, and gut, but it may also subject hagfish to reduced levels of dissolved oxygen and elevated levels of the products of biological degradation. This study investigated the impacts of hypoxia and ammonia on the assimilation and metabolism of selected nutrients (glycine, l-alanine, and glucose) in Pacific hagfish (Eptatretus stoutii). Throughout exposure to hypoxia, plasma glucose levels increased. This was not accompanied by an increase in gut glucose transport, which suggests mobilization of glucose from body glycogen stores. Hypoxia preexposure enhanced glycine absorption across the gut and the gill, although l-alanine uptake was unchanged in these tissues. A 24-h period of exposure to hypoxia in hagfish concurrently exposed to waterborne radio-labeled glycine led to a large (5.7-fold) increase in brain glycine accumulation. Preexposure to high levels of waterborne ammonia (10 mM) for 24 h had no impact on gut or skin glycine uptake. These results indicate that hagfish are adapted to maintain nutrient assimilation despite environmental stressors and that tissue-specific absorption of key nutrients such as glycine can even be enhanced in order to sustain critical functions during hypoxia. |
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Authors:
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Carol Bucking; Chris N Glover; Chris M Wood |
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Publication Detail:
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Type: Journal Article Date: 2011-10-14 |
Journal Detail:
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Title: Physiological and biochemical zoology : PBZ Volume: 84 ISSN: 1537-5293 ISO Abbreviation: Physiol. Biochem. Zool. Publication Date: 2011 Nov |
Date Detail:
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Created Date: 2011-10-27 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100883369 Medline TA: Physiol Biochem Zool Country: United States |
Other Details:
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Languages: eng Pagination: 607-17 Citation Subset: IM |
Affiliation:
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Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada; and Department of Biology, University of Ottawa, Ontario, Canada; 2Bamfield Marine Sciences Centre, Bamfield, British Columbia, Canada; 3School of Biological Sciences, University of Canterbury, Christchurch, New Zealand; 4Department of Biology, McMaster University, Hamilton, Ontario, Canada. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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