| Cold acclimation induces proliferation of sarcoplasmic reticulum without increase in Ca2+-ATPase activity in white axial muscle of striped bass (Morone saxatilis). | |
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MedLine Citation:
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PMID: 11857457 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of acclimation of striped bass to cold (5 degrees C) and warm (25 degrees C) temperatures upon ultrastructural features of white axial skeletal muscle are quantified. Surface density of sarcoplasmic reticulum (SR) increased by almost 30%, and SR volume density increased by about 20% during cold acclimation. Proliferation of SR suggests an increase in available SR surface for re-sequestration of Ca2+ and a decrease in diffusion path length for Ca2+ during cold acclimation. Average cross-sectional areas and cross-sectional perimeters of myofibrils situated in the center of muscle fibers decreased during cold acclimation by approximately 20% and 11%, respectively. Additionally, average major and minor axes of ellipses fit to central myofibrillar cross-sections decreased by approximately 12% and 8%, respectively, during cold acclimation. These measurements define a decrease in average myofibrillar diameter and suggest a decrease in diffusion path length for Ca2+ to and from myofibrillar activation sites. Measurements of peripheral myofibrils that had elongated profiles in cross-sections indicate that maximum profile length of these myofibrils decreases by about 17%. Peripheral myofibrils may break up into smaller myofibrils with more rounded cross-sectional profiles during cold acclimation. SR Ca2+-ATPase of white axial muscle was also measured in unfractionated homogenates and in crude SR-enriched subcellular fractions from cold- and warm-acclimated striped bass. No difference in SR Ca2+-ATPase activity per g wet weight was observed between cold- and warm-acclimated animals. Lack of increase in SR Ca2+-ATPase per g wet weight, despite a significant proliferation of SR, probably results in a decrease in average Ca2+-ATPase pump density within the SR membrane during cold acclimation. Thus, compensation for decreased diffusion coefficient of Ca2+ during cold acclimation appears due to the combined effects of proliferation of SR surface density and a decrease in average myofibrillar diameter. |
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Authors:
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William K Riemenschneider; Bruce D Sidell |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: The Journal of experimental zoology Volume: 292 ISSN: 0022-104X ISO Abbreviation: J. Exp. Zool. Publication Date: 2002 Feb |
Date Detail:
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Created Date: 2002-02-21 Completed Date: 2002-03-14 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0375365 Medline TA: J Exp Zool Country: United States |
Other Details:
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Languages: eng Pagination: 231-40 Citation Subset: IM |
Copyright Information:
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Copyright 2002 Wiley‐Liss, Inc. |
Affiliation:
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Pathology Section, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acclimatization* Animals Bass / physiology* Calcium / pharmacokinetics Calcium-Transporting ATPases / metabolism* Cold Temperature Diffusion Muscle, Skeletal / physiology* Myofibrils / ultrastructure Sarcoplasmic Reticulum / physiology* |
| Chemical | |
Reg. No./Substance:
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7440-70-2/Calcium; EC 3.6.1.8/Calcium-Transporting ATPases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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