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Originally published In Press as doi:10.1074/jbc.M109966200 on January 14, 2002
J. Biol. Chem., Vol. 277, Issue 12, 10037-10043, March 22, 2002
Very Low Density Lipoprotein (VLDL) Receptor-deficient Mice Have
Reduced Lipoprotein Lipase Activity
POSSIBLE CAUSES OF HYPERTRIGLYCERIDEMIA AND REDUCED BODY MASS
WITH VLDL RECEPTOR DEFICIENCY*
Hiroaki
Yagyu §,
E. Peer
Lutz ,
Yuko
Kako ,
Steven
Marks ,
Yunying
Hu ,
Sungshin Y.
Choi¶,
Andrè
Bensadoun , and
Ira J.
Goldberg **
From the Department of Medicine, Columbia University,
New York, New York 10032, ¶ Palo Alto Medical Foundation, Palo
Alto, California 94301, and Division of Nutritional Sciences,
Cornell University, Ithaca, New York 14853
Although very low density lipoprotein
(VLDL) receptor (VLDLr) knockout mice have been reported to have no
lipoprotein abnormalities, they develop less adipose tissue than
control mice when fed a high calorie diet. Mice that are deficient in
adipose tissue expression of lipoprotein lipase (LpL) also have less
fat, but only when crossed with ob/ob mice. We hypothesized that the
VLDLr, a protein that will bind and transport LpL, is required for
optimal LpL actions in vivo and that hypertriglyceridemia
due to VLDLr deficiency is exacerbated by either LpL deficiency or VLDL
overproduction. Fasted VLDLr knockout (VLDLr0) mice were more
hypertriglyceridemic than controls (2-fold greater triglyceride
levels). The hypertriglyceridemia due to VLDLr0 was even more evident
when VLDLr0 mice were crossed with heterozygous LpL-deficient (LpL1)
and human apolipoprotein B (apoB) transgenic mice. This was due to an
increase in apoB48-containing VLDL. [3H]VLDL turnover
studies showed that VLDL-triglyceride clearance in VLDLr0/LpL1
mice was impaired by 50% compared with LpL1 mice. VLDLr0/LpL1 mice had
less LpL activity in postheparin plasma, heart, and skeletal muscle.
Infection of mice with an adenovirus-expressing receptor-associated
protein, an inhibitor of the VLDLr, reduced LpL activity in wild type
but not VLDLr0 mice. Therefore, the VLDLr is required for normal LpL
regulation in vivo, and the disruption of VLDLr results in
hypertriglyceridemia associated with decreased LpL activity.
*
This work was supported by NHLBI, National Institutes of
Health Grants HL45095 (to I. J. G.) and HL 14990 (to A. B.) and
Deutsche Forschungsgemeinschaft Grant Ra914/1-1 (to E. P. L.). The
atherosclerosis assays were performed with assistance for a core
pathology laboratory supported by NIH Grant HL56984.The costs of publication of this article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
§
Supported in part by a grant from the Japan Health Science Foundation.
**
To whom correspondence should be addressed: Dept. of Medicine,
Columbia University, 630 W. 168th St., New York, NY 10032. Tel.:
212-305-3678; Fax: 212-305-5384; E-mail: ijg3@columbia.edu.
Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2002 by the American Society for Biochemistry and Molecular Biology.
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