Increased formation of lysophosphatidic acids by lysophospholipase D in serum of hypercholesterolemic rabbits.
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| Abstract |
Lysophosphatidic acid (LPA) is a biologically active phospholipid that has been identified as a vasoactive principle in incubated plasma and serum of mammals. Previously, we found that mammalian plasma and serum contain a lysophospholipase D, which hydrolyzes lysophosphatidylcholines (LPCs) with different fatty acyl groups to the corresponding LPAs during its incubation at 37 degree C. In this study, we examined whether lysophospholipase D activity and levels of LPCs in rabbit serum were modulated by feeding rabbits a high cholesterol diet. Results showed that the serum levels of LPCs increased gradually in animals fed a high cholesterol diet for 12 weeks. We found that the levels of individual LPAs formed on incubation of serum for 24 h increased with an increase in the period of feeding of rabbits a high cholesterol diet. LPA with a linoleate residue was the most abundant LPA, followed in order by 16:0-, 18:1- and 18:0-LPAs. LPA was found to increase attachment of the monocytic cell line THP-1 to vascular endothelial cells pre-stimulated with tumor necrosis factor-alpha. These results indicated that increases in the levels of LPAs generated by lysophospholipase D in the blood of hypercholesterolemic rabbits may be relevant to attachment of monocytes to vascular walls, a key phenomenon observed at an early stage of atherosclerosis.
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| Authors | Akira Tokumura, Yumi Kanaya, Masaki Kitahara, Maki Miyake, Yasuko Yoshioka, Kenji Fukuzawa |
| Journal | Journal of lipid research (J Lipid Res) Vol. 43 Issue 2 Pg. 307-15 (Feb 2002) ISSN: 0022-2275 [Print] United States |
| PMID | 11861673 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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