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during Thyroid Carcinogenesis
Laboratory of Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892-4264 [H. Y., H. S., L. Z., S-Y. C.]; National Human Genome Research Institute, NIH, Bethesda, Maryland 20892-4264 [P. M.]; and Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157-1072 [M. C. W.]
The molecular genetics underlying thyroid carcinogenesis is not clear. Recent identification of a PAX8-peroxisome proliferator-activated receptor
(PPAR
) fusion gene in human thyroid follicular carcinoma suggests a tumor suppressor role of PPAR
in thyroid carcinogenesis. Mice harboring a knockin mutant thyroid hormone ß receptor (TRßPV) spontaneously develop thyroid follicular carcinoma through pathological progression of hyperplasia, capsular invasion, vascular invasion, anaplasia, and eventually, distant organ metastasis. This mutant mouse (TRßPV/PV mouse) provides an unusual opportunity to ascertain the role of PPAR
in thyroid carcinogenesis. Here, we show that the expression of PPAR
mRNA was repressed in the thyroid gland of mutant mice during carcinogenesis. In addition, TRßPV acted to abolish the ligand (troglitazone)-mediated transcriptional activity of PPAR
. These results indicate that repression of PPAR
expression and its transcriptional activity are associated with thyroid carcinogenesis and raise the possibility that PPAR
could be tested as a therapeutic target in thyroid follicular carcinoma.
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