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Volume 271, Number 29,
Issue of July 19, 1996
pp. 17147-17151
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
Thyroid Hormone Export Regulates Cellular Hormone Content and
Response
(Received for publication, February 6, 1996)
Ralff C. J.
Ribeiro
,
Ralph R.
Cavalieri
¶
,
Noureddine
Lomri
,
Cherradi M.
Rahmaoui
,
John D.
Baxter
and
Bruce F.
Scharschmidt
From the Metabolic Research Unit and
Gastroenterology Division, Department of Medicine, and
¶ Veterans Affairs Medical Center, University of California,
San Francisco, California 94143-0540
Actions of thyroid hormones (THs) are determined
by intracellular free hormone concentration. Here we report that
enhanced TH extrusion via a saturable, cold-sensitive mechanism lowers
intracellular TH and causes TH resistance in hepatoma cells. Since
these cells overexpress multidrug resistance P-glycoproteins and TH
extrusion and resistance are blunted by verapamil, P-glycoproteins may
mediate this resistance. Verapamil-inhibitable TH efflux was also found
in primary hepatocytes, cardiocytes, and fibroblasts. These findings
demonstrate that TH extrusion can modulate TH availability and action
in mammalian cells.

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Copyright © 1996 by the American Society for Biochemistry and Molecular Biology.
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