Document Detail

Differential effects of dietary fish oil on myocardial prostaglandin I2 and thromboxane A2 production.
MedLine Citation:
PMID:  1899979     Owner:  NLM     Status:  MEDLINE    
Marmoset monkeys (Callithrix jacchus) were maintained for 24 mo on a standard primate diet [reference (Ref) diet] or this diet supplemented (8% wt/wt) with either sheep fat (SF), sunflower seed oil (SSO), or tuna fish oil (TFO). The polyunsaturated fatty acids (PUFA) of myocardial phospholipids demonstrated significant alterations as a result of the dietary (n-3) or (n-6) lipid supplementation. The reduction (P less than 0.05) in prostaglandin (PG) I2 in PUFA diet-fed groups (SSO, 113.8 +/- 7.8; TFO, 87.9 +/- 8.2 compared with Ref, 153.9 +/- 7.4 pg/mg dry wt) seems to be due to the rate limitation of the endogenous substrate, because the addition of exogenous arachidonic acid (AA) has obliterated the dietary difference. However, AA did not increase the basal PGI2 production in the Ref or SF dietary groups, which differed from that for thromboxane (Tx) A2 where 2- to 5-fold stimulation was observed. It is suggested that there exists a preferential channeling mechanism to direct AA derived from phospholipase hydrolysis of membrane phospholipids toward PGI2 synthesis. Conversely, the bulk of the AA for TxA2 biosynthesis appears to be supplied by a cytosolic nonesterified fatty acid pool. The effective replacement of AA of this pool and a specific inhibition of TxA2 synthetase enzyme complex by the (n-3) PUFA of fish oil are offered as likely mechanisms for the greater inhibition of TxA2 compared with PGI2 production observed in the present and previous studies. The present data on myocardial eicosanoids correlate well with the beneficial qualities of (n-3) and (n-6) dietary PUFA on cardiac function that we have reported previously.
M Y Abeywardena; P L McLennan; J S Charnock
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of physiology     Volume:  260     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1991 Feb 
Date Detail:
Created Date:  1991-03-22     Completed Date:  1991-03-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H379-85     Citation Subset:  IM    
Division of Human Nutrition, Glenthorne Laboratory, Commonwealth Scientific and Industrial Research Organization, Australia.
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MeSH Terms
Dietary Fats, Unsaturated / pharmacology*
Eicosanoids / metabolism
Epoprostenol / biosynthesis*
Fatty Acids / metabolism
Fish Oils / pharmacology*
Myocardium / metabolism*
Thromboxane A2 / biosynthesis*
Reg. No./Substance:
0/Dietary Fats, Unsaturated; 0/Eicosanoids; 0/Fatty Acids; 0/Fish Oils; 35121-78-9/Epoprostenol; 57576-52-0/Thromboxane A2

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