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Department of Medicine, University of California, San Diego, California 92093-0618; Bristol-Myers Squibb Co. (D.B.W.-I., H.Z., T.V., G.J.G.), Princeton, New Jersey 08543; and Metabolic Research Unit (J.D.B.) and Departments of Pharmaceutical Chemistry (G.C., T.S.S.) and Molecular and Cellular Pharmacology (G.C., T.S.S.), University of California, San Francisco, California 94143
Address all correspondence and requests for reprints to: Wolfgang H. Dillmann M.D., Department of Medicine, 9500 Gilman Drive (BSB 5063), La Jolla, California 92093-0618. E-mail: wdillmann{at}ucsd.edu
Thyroid hormones influence the function of many organs and mediate
their diverse actions through two types of thyroid hormone receptors,
TR
and TRß. Little is known about effects of ligands that
preferentially interact with the two different TR subtypes. In the
current study the comparison of the effects of the novel synthetic
TRß-selective compound GC-1 with T3 at
equimolar doses in hypothyroid mice revealed that GC-1 had better
triglyceride-lowering and similar cholesterol-lowering effects than
T3. T3, but not GC-1, increased heart rate and
elevated messenger RNA levels coding for the If channel
(HCN2), a cardiac pacemaker that was decreased in hypothyroid mice.
T3 had a larger positive inotropic effect than GC-1.
T3, but not GC-1, normalized heart and body weights and
messenger RNAs of myosin heavy chain
and ß and the sarcoplasmic
reticulum adenosine triphosphatase (Serca2). Additional dose-response
studies in hypercholesteremic rats confirmed the preferential effect of
GC-1 on TRß-mediated parameters by showing a much higher potency to
influence cholesterol and TSH than heart rate. The preferred
accumulation of GC-1 in the liver vs. the heart probably
also contributes to its marked lipid-lowering effect vs.
the absent effect on heart rate. These data indicate that GC-1 could
represent a prototype for new drugs for the treatment of high lipid
levels or obesity.
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M. A. Lazar Editorial: A Sweetheart Deal for Thyroid Hormone Endocrinology, September 1, 2000; 141(9): 3055 - 3056. [Full Text] [PDF] |
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