Document Detail

Dietary omega 6 fatty acids and the effects of hyperthyroidism in mice.
MedLine Citation:
PMID:  7738467     Owner:  NLM     Status:  MEDLINE    
The influence of the type of dietary fat on the effects of thyroid hormones was investigated in mice. Hyperthyroidism was achieved by providing thyroid hormones (T3 and T4) in the drinking water. Both hyperthyroid and euthyroid mice (Mus musculus) were fed isoenergetic diets containing 18% (w/w) total lipid but differing in fatty acid composition. Diets were either low in the polyunsaturated linoleic acid (18:2, omega 6) and high in saturated fatty acids (SFAs) or low in saturated fats and high in the polyunsaturated fatty acid (PUFA), linoleic acid. Treatments were maintained for 21-22 days. Plasma thyroid hormone levels, standard metabolic rate (SMR), changes in body mass, specific activities of malic enzyme (ME), Na-K-ATPase and glycerolphosphate dehydrogenase (GPDH) of the liver were measured. Fatty acid composition of the liver phospholipids was also determined. Levels of T3 (15-17 nM) and T4 (250-255 nM) were significantly higher in the respective hyperthyroid groups. There was no significant influence of the diet on hormone levels. Hyperthyroidism increased the SMR 37-44% above the euthyroid levels. A significant body weight loss of 14-18% was observed in hyperthyroid mice on the PUFA diet but not in those on the SFA diet. PUFA diet significantly reduced the activity of ME but had no effect on Na-K-ATPase or GPDH activity. Activities of Na-K-ATPase and GPDH were significantly elevated in all hyperthyroid groups. Mice on T4 and PUFA diet showed a highly significant 399% increase in GPDH activity above the euthyroid level.(ABSTRACT TRUNCATED AT 250 WORDS)
N Deshpande; A J Hulbert
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of endocrinology     Volume:  144     ISSN:  0022-0795     ISO Abbreviation:  J. Endocrinol.     Publication Date:  1995 Mar 
Date Detail:
Created Date:  1995-06-05     Completed Date:  1995-06-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375363     Medline TA:  J Endocrinol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  431-9     Citation Subset:  IM    
Department of Biological Sciences, University of Wollongong, New South Wales, Australia.
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MeSH Terms
Basal Metabolism
Body Weight
Fatty Acids / administration & dosage*,  analysis
Hyperthyroidism / metabolism*
Linoleic Acids / administration & dosage
Liver / metabolism*
Malate Dehydrogenase / metabolism*
Mice, Inbred CBA
Phospholipids / chemistry,  metabolism
Reg. No./Substance:
0/Fatty Acids; 0/Linoleic Acids; 0/Phospholipids; EC Dehydrogenase

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