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Time course of thermal adaptation in plasma membranes of trout kidney. I. Headgroup composition

Time course of thermal adaptation in plasma membranes of trout kidney. I. Headgroup composition IN ECTOTHERMS, in body temperature initiate metabolic responses that alter the composition of biological membranes, thus ensuring that membrane constituents with appropriate physical properties are matched to the prevailing ambient temperature and resulting in the compensation of membrane function (12). Several aspects of membrane organization are subject to modulation, including 1) the degree of acyl-chain unsaturation (lo), 2) the molecular species composition of s (15), 3) composition (l3), 4) the relative proportions of diacyl vs. plasmalogen s (25), and 5)) the cholesterolto- ratio (30). However, the relative contributions of these various compositional adjustments to the process of homeoviscous adaptation, either in different membranes or in the same membrane at different times the response, have not been evaluated. R622 Existing evidence suggeststhat not all aspects of membrane composition change with a similar time course from one temperature to another. Although increased acyl-chain unsaturation is a nearly ubiquitous response of winter-active ectotherms to cold temperatures, altered levels of desaturase enzyme activity (9) and polyunsaturated fatty acid content (26) are not evident for 3-6 days after a change in temperature. Other aspects of membrane structure, including molecular species composition (24), appear to change more rapidly. Of particular interest is the possibility http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Regulatory, Integrative and Comparative Physiology The American Physiological Society

Time course of thermal adaptation in plasma membranes of trout kidney. I. Headgroup composition

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Publisher
The American Physiological Society
Copyright
Copyright © 1988 the American Physiological Society
ISSN
0363-6119
eISSN
1522-1490
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Abstract

IN ECTOTHERMS, in body temperature initiate metabolic responses that alter the composition of biological membranes, thus ensuring that membrane constituents with appropriate physical properties are matched to the prevailing ambient temperature and resulting in the compensation of membrane function (12). Several aspects of membrane organization are subject to modulation, including 1) the degree of acyl-chain unsaturation (lo), 2) the molecular species composition of s (15), 3) composition (l3), 4) the relative proportions of diacyl vs. plasmalogen s (25), and 5)) the cholesterolto- ratio (30). However, the relative contributions of these various compositional adjustments to the process of homeoviscous adaptation, either in different membranes or in the same membrane at different times the response, have not been evaluated. R622 Existing evidence suggeststhat not all aspects of membrane composition change with a similar time course from one temperature to another. Although increased acyl-chain unsaturation is a nearly ubiquitous response of winter-active ectotherms to cold temperatures, altered levels of desaturase enzyme activity (9) and polyunsaturated fatty acid content (26) are not evident for 3-6 days after a change in temperature. Other aspects of membrane structure, including molecular species composition (24), appear to change more rapidly. Of particular interest is the possibility

Journal

AJP - Regulatory, Integrative and Comparative Physiology – The American Physiological Society

Published: Oct 1, 1988

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