CCAAT/Enhancer-binding Protein-Homologous Protein Sensitizes to SU5416 by Modulating p21 and PI3K/Akt Signal Pathway in FRO Anaplastic Thyroid Carcinoma Cells

S. H. Kim; J. G. Kang; C. S. Kim; S.-H. Ihm; M. G. Choi; H. J. Yoo; S. J. Lee

doi:10.1055/s-0032-1323680

Hormone and Metabolic Research, Table of Contents

Horm Metab Res 2013; 45(01): 9-14
DOI: 10.1055/s-0032-1323680

Original Basic

CCAAT/Enhancer-binding Protein-Homologous Protein Sensitizes to SU5416 by Modulating p21 and PI3K/Akt Signal Pathway in FRO Anaplastic Thyroid Carcinoma Cells

Authors

S. H. Kim

¹Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Hallym University, Chuncheon, Republic of Korea
J. G. Kang

¹Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Hallym University, Chuncheon, Republic of Korea
C. S. Kim

¹Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Hallym University, Chuncheon, Republic of Korea
S.-H. Ihm

¹Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Hallym University, Chuncheon, Republic of Korea
M. G. Choi

¹Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Hallym University, Chuncheon, Republic of Korea
H. J. Yoo

¹Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Hallym University, Chuncheon, Republic of Korea
S. J. Lee

¹Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Hallym University, Chuncheon, Republic of Korea

Abstract

SU5416, vascular endothelial cell growth factor receptor inhibitor, suppresses hypoxia-induced angiogenesis, growth, proliferation, and metastasis in cancer cells. CCAAT/enhancer-binding protein-homologous protein (CHOP) has pivotal roles in regulation of growth and survival. In the present study, we evaluated the effects of SU5416 on cell survival, p21, and PI3K/Akt signal pathway in FRO anaplastic thyroid carcinoma (ATC) cells. Moreover, we investigated the roles of CHOP in cell survival under condition of SU5416 treatment in FRO ATC cells. After SU5416 treatment, cell viability, PARP-1, and caspase-3 protein levels were not changed. p53 and p27 protein levels decreased while p21 protein levels increased. Phospho-Akt protein levels were not altered. In SU5416-treated situation, cell viability was not different before and after administration of either p21 siRNA or LY294002 whereas it was lessened after co-administration of p21 siRNA and LY294002. Compared to SU5416 treatment alone, cell viability was reduced with CHOP plasmid but it was unchanged with CHOP siRNA. PARP-1 and caspase-3 protein levels with CHOP plasmid were elevated whereas the protein levels with CHOP siRNA were similar. While CHOP plasmid transfection diminished p21 and phospho-Akt protein levels, CHOP siRNA transfection did not alter the protein levels. In conclusion, these results suggest that CHOP may sensitize FRO ATC cells to SU5416 thereby inhibiting cell survival by modulating p21 and PI3K/Akt signal pathway. Furthermore, these findings imply that CHOP may be a possible candidate as the chemosensitizing factor for induction of cytotoxicity in ATC cells exposed to SU5416.

Key words

anaplastic thyroid carcinoma - SU5416 - CCAAT/enhancer-binding protein-homologous protein - p21 - Akt

Full Text

References

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