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Oxidation of low density lipoprotein by bovine and porcine aortic endothelial cells and porcine endocardial cells in culture

Morgan, J., Warden-Smith, Jeremy, Wilkins, G. M. and Leake, D. S. 1993. Oxidation of low density lipoprotein by bovine and porcine aortic endothelial cells and porcine endocardial cells in culture. Atherosclerosis 102 (2) , pp. 209-216. 10.1016/0021-9150(93)90163-O

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Oxidation of low density lipoprotein (LDL) in atherosclerotic lesions may be involved in converting macrophages into cholesterol-laden foam cells, a major characteristic of atherosclerotic lesions. It has been reported, and is widely believed, that endothelial cells derived from rabbit, pig and human aortas, but not those derived from bovine aortas, are capable of oxidising LDL in vitro. We have re-investigated this subject and found that during a 48-h incubation period bovine aortic endothelial cells (both in primary culture and in subcultures) were capable of consistently modifying LDL, increasing its uptake and degradation by macrophages by more than 4-fold. Incubation of LDL with bovine aortic endothelial cells for only 24 h, however, produced inconsistent modification of the LDL, whereas mouse peritoneal macrophages consistently modified LDL in 24 h. The modification of LDL by bovine aortic endothelial cells was an oxidative process, as the chain-breaking antioxidants, alpha-tocopherol and probucol, completely or greatly inhibited it. Thus, bovine aortic endothelial cells are capable of oxidising LDL but they are slower at doing so than are certain other types of cells. Nitric oxide generated by activated macrophages has very recently been shown to inhibit their oxidation of LDL. We have therefore investigated whether or not the inhibition of the constitutive nitric oxide synthase of bovine or porcine aortic endothelial cells would increase their rate of oxidation of LDL.(ABSTRACT TRUNCATED AT 250 WORDS)

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > QH Natural history > QH301 Biology
R Medicine > RM Therapeutics. Pharmacology
Uncontrolled Keywords: Atherosclerosis; Endocardial cells; Endothelial cells; Low density lipoprotein; Oxidation
Publisher: Elsevier
ISSN: 0021-9150
Last Modified: 04 Jun 2017 02:12

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