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(Received for publication, December 19, 1996, and in revised form, April 24, 1997)
From the Department of Pathology and Laboratory of Medicine, the
University of North Carolina,
Chapel Hill, North Carolina 27599-7525, the ¶ Institut Pasteur
de Lille U-235, Lille, France, and the ** Department of Medicine,
Durham VA Hospital and Duke University Medical Center,
Durham, North Carolina 27705
Apolipoprotein (apo) E, a constituent of several
lipoproteins, is a ligand for the low density lipoprotein receptor, and
this interaction is important for maintaining cholesterol and
triglyceride homeostasis. We have used a gene replacement strategy to
generate mice that express the human apoE3 isoform in place of the
mouse protein. The levels of apoE mRNA in various tissues are
virtually the same in the human apoE3 homozygous (3/3) mice and their
littermates having the wild type mouse allele (+/+). Total cholesterol
and triglyceride levels in fasted plasma from the 3/3 mice were not different from those in the +/+ mice, when maintained on a normal (low
fat) chow diet. We found, however, notable differences in the
distribution of plasma lipoproteins and apolipoprotein E between the
two groups:
-migrating lipoproteins and plasma apoB100 levels are
decreased in the 3/3 mice, and the apoE distribution is shifted from
high density lipoproteins to larger lipoprotein particles. In addition,
the fractional catabolic rate of exogenously administered remnant
particles without apoE was 6-fold slower in the 3/3 mice compared with
the +/+ mice. When the 3/3 and +/+ animals were fed a high fat/high
cholesterol diet, the 3/3 animals responded with a dramatic increase
(5-fold) in total cholesterol compared with the +/+ mice (1.5-fold),
and after 12 weeks on this same diet the 3/3 animals developed
significantly (at least 13-fold) larger atherosclerotic plaques in the
aortic sinus area than the +/+ animals. Thus the structural differences
between human APOE3 and mouse ApoE proteins are sufficient to cause an
increased susceptibility to dietary-induced hypercholesterolemia and
atherosclerosis in the 3/3 mice.
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