title: Docosahexaenoic acid- and eicosapentaenoic acid-enriched cardiolipin in the Manila clam Ruditapes philippinarum.
abstract: The FA composition of cardiolipin (CL) from the Manila clam Ruditapes philippinarum was investigated in whole body and individual organs. CL was isolated by HPLC and its chemical structure characterized using NMR spectroscopy. Two prominent FA, EPA and DHA, were found in approximately equal proportions, contributing together up to 73 mol% of the total FA. The FA composition of CL is presumed to reflect a specific synthesis pathway independent of diet and of total glycerophospholipid FA composition. To the best of our knowledge, this is the first time that a CL dominated by the two PUFA 22:6n-3 and 20:5n-3 has been characterized and described. This EPA + DHA specificity of the CL in the Manila clam is thought to reflect a functional and structural modification of mitochondrial membranes of this bivalve species compared with scallops, oysters, and mussels that possess a CL dominated by DHA. The FA composition and levels of CL differed little between separated organs, and the large pool of DHA and EPA was found fairly equally distributed in gills, mantle, foot, siphon, and muscle. However, whereas DHA and PUFA levels were most stable between organs, EPA and arachidonic acid were significantly more variable and seemed to be interrelated.
authors.affiliation: Unité mixte Centre National de la Recherche Scientifique 6521, Université de Bretagne Occidentale, 29238 Brest cedex, France.
authors.forename: Edouard
authors.initials: E
authors.lastname: Kraffe
authors.forename: Philippe
authors.initials: P
authors.lastname: Soudant
authors.forename: Yanic
authors.initials: Y
authors.lastname: Marty
authors.forename: Nelly
authors.initials: N
authors.lastname: Kervarec
mesh_terms: D000818:Animals; D049872:Bivalvia / Q000737:chemistry* / Q000378:metabolism; D002308:Cardiolipins / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D004281:Docosahexaenoic Acids / Q000032:analysis / Q000378:metabolism*; D015118:Eicosapentaenoic Acid / Q000032:analysis / Q000378:metabolism*; D005121:Extremities; D005227:Fatty Acids / Q000032:analysis; D005880:Gills / Q000737:chemistry; D008055:Lipids / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D009132:Muscles / Q000737:chemistry
chemical_list: D002308:Cardiolipins; D005227:Fatty Acids; D008055:Lipids; D004281:Docosahexaenoic Acids; D015118:Eicosapentaenoic Acid