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MicroRNA-16 Down-regulates BCL2 Expression and Induces Papillary Thyroid Carcinoma Cell Apoptosis Via Extracellular-regulated Kinase Pathway

MicroRNA-16 Down-regulates BCL2 Expression and Induces Papillary Thyroid Carcinoma Cell Apoptosis Via Extracellular-regulated Kinase Pathway

Jie Yang

Central Laboratory, Danyang People’s Hospital of Jiangsu Province, Danyang Hospital Affliated to Nantong University, Jiangsu, China

*      Corresponding author: yctcyangjie@163.com

ABSTRACT

Papillary thyroid cancer is one of the most common tumours subtype in thyroid cancers. Substantial amount of data have indicated that miR-16 is an important regulator of various tumours; however, the molecular functions of miR-16 in papillary thyroid cancer remained largely elusive. In order to investigate the regulation of miR-16, human papillary thyroid carcinoma cells are transfected with miR-16 mimics or inhibitors. Targeting miR-16 and using dual-luciferase reporter assay, qRT-PCR and Western blot, the mRNA and protein expression were detected, respectively. Cellular apoptosis were examined by flow cytometry and Western blots was applied to assess the cleaved caspase-3, -8, -9, and cleaved poly-ADP-ribose polymerase. Protein expression of extracellular-regulated kinase were detected. Finally, data analysed statistically to determine significantly differences among groups. Results showed that breakpoint cluster 2 was a direct target of miR-16, and the expression was negatively correlated. Moreover, miR-16 promoted apoptosis suppressing breakpoint cluster 2 through phosphorylation of extracellular-regulated kinase. The study validates miR-16 as a tumour suppressor gene in papillary thyroid cancer cells, and revealed a novel mechanism of miR-16-mediated apoptosis through extracellular-regulated kinase pathway.

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Pakistan Journal of Zoology

June

Pakistan J. Zool., Vol. 56, Iss. 3, pp. 1001-1500

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