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American Journal of Pathology, Vol 149, 1831-1838, Copyright © 1996 by American Society for Investigative Pathology
REGULAR ARTICLES |
K Nakazato, T Ishibashi, J Shindo, M Shiomi and Y Maruyama
First Department of Internal Medicine, Fukushima Medical College, Japan.
The expression of very low density lipoprotein (VLDL) receptor mRNA in atherosclerotic lesions in rabbits was investigated. To examine the expression of the VLDL receptor in the vascular wall, poly(A)+ RNA was isolated from whole aortas of cholesterol-fed New Zealand White (NZW), Watanabe heritable hyperlipidemic (WHHL), and normal NZW rabbits, and then Northern blot analysis was performed. The VLDL receptor mRNA was detected in aortas from both NZW rabbits fed 0.5% cholesterol for 16 weeks and 12-month-old WHHL rabbits, whereas no expression was seen in normal NZW rabbit aortas. To further determine the localization of the VLDL receptor mRNA, in situ hybridization using digoxigenin-labeled riboprobes and immunohistochemistry using monoclonal antibodies against each cell component were performed. Early atherosclerotic lesions, termed fatty streaks, in the NZW rabbits fed 0.5% cholesterol for 4 weeks demonstrated strong expression of the VLDL receptor mRNA by macrophages. The VLDL receptor mRNA was also expressed in more advanced atherosclerotic lesions from both atherogenic animal models. The predominant origin of the VLDL receptor mRNA-positive cells was macrophages, and some intimal smooth muscle cells appeared to express a weak but significant signal in these advanced lesions. Our findings suggest that the VLDL receptor expression may play a role in the development of atherosclerosis.
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