Document Detail


Fatty acid composition of tissue phospholipids and prostaglandin excretion in hyperlipidemia induced in rats by implantation of the mammotropic pituitary tumor MtT-F4.
MedLine Citation:
PMID:  6877047     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A mammotropic pituitary tumor, MtT-F4, was implanted into male Fisher 344 rats for a period of 4 weeks. This tumor induced growth retardation, hyperlipidemia, hepatic hypertrophy and adrenal hyperplasia. Lipids were extracted from various tissues. In tumor-bearing rats, phospholipid concentration was found to be increased in plasma, spleen and testis. Distribution among the various phospholipid classes was similar to that of controls except in liver and heart, where phosphatidylcholine was increased at the expense of phosphatidylinositol and phosphatidylserine. The main difference was in the fatty acid composition of major phospholipids. The proportion of omega 6 fatty acids was lower and that of docosahexaenoic acid of the omega 3 series (22:6 omega 3) was higher in most tissues, especially in plasma, liver, heart and kidney. Concurrently, the urinary excretion of two endogenous metabolites of PGI2 (2,3-dinor-6-keto-PGF1 alpha and 6,15-diketo-13,14-dihydro-2,3-dinor-PGF1 alpha) was found to be increased significantly in tumor-bearing rats. The results raise the hypothesis that hormonal changes induced by the MtT-F4 tumor accelerate the conversion of arachidonic acid (20:4 omega 6) to prostaglandins. This effect, perhaps coupled with a diversion of linoleic acid (18:2 omega 6) towards other metabolic processes, would account for a partial depletion of membrane phospholipids in 18:2 omega 6 and for the reduced production of longer chain omega 6 unsaturated acids from 20:4 omega 6, creating a state of "relative essential fatty acid deficiency." As a result, the metabolism of omega 3 fatty acids is altered towards an enhanced production of 22:6 omega 3 which accumulates in the lipids of cell membranes to compensate for the depletion of unsaturated acids of the omega 6 series.
Authors:
Y S Huang; A Martineau; P Falardeau; J Davignon
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Lipids     Volume:  18     ISSN:  0024-4201     ISO Abbreviation:  Lipids     Publication Date:  1983 Jun 
Date Detail:
Created Date:  1983-09-23     Completed Date:  1983-09-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0060450     Medline TA:  Lipids     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  412-22     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Cell Line
Fatty Acids / analysis
Hyperlipidemias / etiology,  physiopathology*
Male
Neoplasms, Experimental / complications,  physiopathology
Phospholipids / isolation & purification,  metabolism*
Pituitary Neoplasms / complications,  physiopathology*
Prostaglandins / isolation & purification,  metabolism*
Rats
Rats, Inbred F344
Chemical
Reg. No./Substance:
0/Fatty Acids; 0/Phospholipids; 0/Prostaglandins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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