Abstract:
:Conjugated linoleic acid (CLA) is a collective term that describes different isomers of linoleic acid with conjugated double bonds. Although the main dietary isomer is 9cis,11trans-18:2, which is present in dairy products and ruminant fat, the biological effects of CLA generally have been studied using mixtures in which the 9cis,11trans- and the 10trans,12cis-18:2 were present at similar levels. In the present work, we have studied the impact of each isomer (9cis,11 trans- and 10trans,12cis-18:2) given separately in the diet of rats for 6 wk. The 10trans,12cis-18:2 decreased the triacylglycerol content of the liver (-32%) and increased the 18:0 content at the expense of 18:1 n-9, suggesting an alteration of the delta9 desaturase activity, as was already demonstrated in vitro. This was not observed when the 9cis,11trans-18:2 was given in the diet. Moreover, the 10trans,12cis-18:2 induced an increase in the C22 polyunsaturated fatty acids in the liver lipids. The 10trans,12cis-18:2 was mainly metabolized into conjugated 16:2 and 18:3, which have been identified. The 9cis,11trans isomer was preferentially metabolized into a conjugated 20:3 isomer. Thus, the 9cis,11trans- and the 10trans,12cis-CLA isomers are metabolized differently and have distinct effects on the metabolism of polyunsaturated fatty acids in rat liver while altering liver triglyceride levels differentially.
journal_name
Lipidsjournal_title
Lipidsauthors
Sébédio JL,Angioni E,Chardigny JM,Grégoire S,Juanéda P,Berdeaux Odoi
10.1007/s11745-001-0759-8subject
Has Abstractpub_date
2001-06-01 00:00:00pages
575-82issue
6eissn
0024-4201issn
1558-9307journal_volume
36pub_type
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