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From the Department of Genetics and Department of Meat & Animal Sciences, University of Wisconsin, Madison (J.H.-R., J.R.); F. Hoffmann-LaRoche Ltd, Basel, Switzerland (H.J.K.); TNO-PG, The Gaubius Laboratory, Leiden, the Netherlands (H.M.G.P.); and the Department of Biochemistry and Molecular Biology, University of North Texas Health Sciences Center, Fort Worth (B.J.K., A.L.).
Correspondence to Jan Rapacz, PhD, Immunogenetics Laboratory, University of Wisconsin-Madison, 666 Animal Sciences Bldg, 1675 Observatory Dr, Madison, WI 53706-1284. E-mail rapacz@calshp.cals.wisc.edu.
Abstract Familial
hypercholesterolemia (FHC) in swine, which
resembles human familial combined hyperlipidemia, is a
complex lipid and lipoprotein disorder associated with the development
of severe coronary lesions similar to those occurring in
advanced human coronary disease. The disorder is characterized
by elevated plasma total cholesterol (TC),
triglycerides (TG), LDL-cholesterol (LDL-C),
apolipoproteins (apo) B, C-III, and E, and by decreased levels of
HDL-cholesterol (HDL-C), apoA-I, and
lecithin:cholesterol acyltransferase (LCAT) activity. A
dose-response study with simvastatin, a specific
inhibitor of 3-hydroxy-3-methylglutaryl coenzyme A
(HMG-CoA) reductase, was conducted in four treatment groups of FHC
animals, exhibiting TC
250 mg/dL. The animals were fed 0, 80, 200, or
400 mg simvastatin daily for 3 weeks. The measured serum
parameters included the levels of TC, VLDL-C, LDL-C, HDL-C,
TG, lathosterol, apoA-I, B, C-III, and E, as well as LCAT activity.
Simvastatin at 200 mg/d significantly decreased the levels
of TC (-25%), LDL-C (-27%), lathosterol (-40%), apoB
(-22%),
apoC-III (-37%), and apoE (-24%) and modestly decreased the levels
of HDL-C (-12%) and apoA-I (-11%) (percent relative to the average
pretreatment and posttreatment baseline values) but did not affect the
levels of TG, VLDL-C, the lathosterol/TC ratio, or LCAT activity. The
levels of TC, LDL-C, apoB, and E were also lowered by
simvastatin at 80 or 400 mg/d, but to a lesser extent than
at 200 mg/d, while the other parameters were not influenced
at these doses. The simvastatin-induced decreases of
LDL-C, HDL-C, and apoA-I, B, C-III, and E were significantly correlated
among each other. These results show that the trend of responses in TC,
LDL-C, apoB, apoC-III, and apoE to simvastatin in the FHC
swine is similar to that observed in humans, although the drug is less
potent and efficacious in swine, while the results are different from
those in humans with regard to the remaining parameters.
Key Words: swine simvastatin animal model familial hypercholesterolemia apolipoproteins
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