Dependence on the phospholipid polyunsaturated fatty acids of the oxidative injury of isolated cardiomyocytes.
We investigated the influence of PUFA in phospholipids (PL) on the functional characteristics of cultured cardiomyocytes (CM) in basal conditions and during free radical (FR) stress provoked either by the xanthine/xanthine oxidase (X/XO) system or by a (9Z, 11E, 13 (S), 15Z)-13-hydroperoxyoctadecatrienoic acid (13-HpOTrE). CM were grown in media containing either n - 3 (eicosapentaenoic acid, EPA, and docosahexaenoic acid, DHA) or n - 6 (arachidonic acid, AA). These two groups of CM displayed different PUFA n - 6/n - 3 ratio in PL. However, their basal electromechanical characteristics were similar. The X/XO system drastically altered CM functions, without difference between the two groups of CM. 13-HpOTrE caused a moderate and reversible depression in action potential parameters, which was dependent upon the PL PUFA, since the n - 3-enriched CM exhibited an earlier functional depression but faster recovery. Thus, the peroxidative damage of CM depended on a cross relationship between FR species and the PL PUFA composition.
Laboratory of Cardiovascular Physiopathology and Pharmacology, Institute of Cardiovascular Research, University Hospital Center, 21079 Dijon, France.
Isabelle
I
Durot
Lisa
L
Devillard
Cindy
C
Tissier
David
D
Vandroux
Sophie
S
Voisin
Sabir
S
Jaquir
Luc
L
Rochette
Pierre
P
Athias
D000818:Animals; D002478:Cells, Cultured; D005231:Fatty Acids, Unsaturated / Q000378:metabolism*; D005609:Free Radicals / Q000378:metabolism; D008041:Linoleic Acids / Q000378:metabolism; D008054:Lipid Peroxides / Q000378:metabolism; D032383:Myocytes, Cardiac / Q000166:cytology / Q000378:metabolism*; D018384:Oxidative Stress; D010743:Phospholipids / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D019820:Xanthine / Q000378:metabolism; D014969:Xanthine Oxidase / Q000378:metabolism
D005231:Fatty Acids, Unsaturated; D005609:Free Radicals; D008041:Linoleic Acids; D008054:Lipid Peroxides; D010743:Phospholipids; D019820:Xanthine; C038649:13-hydroperoxy-9,11-octadecadienoic acid; D014969:Xanthine Oxidase