Thyroid hormone receptor-mediated regulation of the methionine adenosyltransferase 1 gene is associated with cell invasion in hepatoma cell lines.
The thyroid hormone T(3) regulates differentiation, growth, and development. We demonstrated that methionine adenosyltransferase 1A (MAT1A) was positively regulated by T(3) identified by cDNA microarray previously. The expression of the MAT1A was upregulated by T(3) in hepatoma cell lines overexpressing thyroid hormone receptors (TRs). Additionally, these findings indicate that MAT1A may be regulated by CCAAT/enhancer binding protein (C/EBP). The critical role of the C/EBP binding sites was confirmed by the reporter or chromatin immuno-precipitation (ChIP) assay. In addition, C/EBP was upregulated in hepatoma cells after T(3) treatment and ectopic expression of MAT1A inhibited cell migration and invasion in J7 hepatoma cells. Conversely, knockdown of MAT1A expression increased cell migration. Together, these findings suggest that the expression of the MAT1A gene is mediated by C/EBP and is indirectly upregulated by T(3). Finally, TR was downregulated in a small subset of hepatocellular carcinoma cells concomitantly reduced the expression of C/EBPalpha and MAT1A.
Department of Biochemistry, School of Medicine, Chang-Gung University, 259 Wen-hwa 1 Road, Taoyuan, 333, Taiwan, ROC.
Sheng-Ming
SM
Wu
Ya-Hui
YH
Huang
Yi-Hsin
YH
Lu
Ling-Fang
LF
Chien
Chau-Ting
CT
Yeh
Ming-Ming
MM
Tsai
Chen-Hsin
CH
Liao
Wei-Jan
WJ
Chen
Chia-Jung
CJ
Liao
Wan-Li
WL
Cheng
Kwang-Huei
KH
Lin
D001483:Base Sequence; D022762:CCAAT-Enhancer-Binding Proteins / Q000378:metabolism; D006528:Carcinoma, Hepatocellular / Q000235:genetics* / Q000378:metabolism* / Q000473:pathology; D045744:Cell Line, Tumor; D002465:Cell Movement; D003513:Cycloheximide / Q000494:pharmacology; D017931:DNA Primers / Q000235:genetics; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D008113:Liver Neoplasms / Q000235:genetics* / Q000378:metabolism* / Q000473:pathology; D008716:Methionine Adenosyltransferase / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000378:metabolism; D009361:Neoplasm Invasiveness; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012334:RNA, Neoplasm / Q000235:genetics / Q000378:metabolism; D034741:RNA, Small Interfering / Q000235:genetics; D011988:Receptors, Thyroid Hormone / Q000378:metabolism*; D014284:Triiodothyronine / Q000494:pharmacology
D022762:CCAAT-Enhancer-Binding Proteins; D017931:DNA Primers; D011500:Protein Synthesis Inhibitors; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D034741:RNA, Small Interfering; D011988:Receptors, Thyroid Hormone; D014284:Triiodothyronine; D003513:Cycloheximide; C506577:MAT1A protein, human; D008716:Methionine Adenosyltransferase