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P38? MAPK is required for arsenic-induced cell transformation.


ABSTRACT: Arsenic exposure has been reported to cause neoplastic transformation through the activation of PcG proteins. In the present study, we show that activation of p38? mitogen-activated protein kinase (MAPK) is required for arsenic-induced neoplastic transformation. Exposure of cells to 0.5 ?M arsenic increased CRE and c-Fos promoter activities that were accompanied by increases in p38? MAPK and CREB phosphorylation and expression levels concurrently with AP-1 activation. Introduction of short hairpin (sh) RNA-p38? into BALB/c 3T3 cells markedly suppressed arsenic-induced colony formation compared with wildtype cells. CREB phosphorylation and AP-1 activation were decreased in p38? knockdown cells after arsenic treatment. Arsenic-induced AP-1 activation, measured as c-Fos and CRE promoter activities, and CREB phosphorylation were attenuated by p38 inhibition in BALB/c 3T3 cells. Thus, p38? MAPK activation is required for arsenic-induced neoplastic transformation mediated through CREB phosphorylation and AP-1 activation.

SUBMITTER: Kim HG 

PROVIDER: S-EPMC4643444 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature

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p38α MAPK is required for arsenic-induced cell transformation.

Kim Hong-Gyum HG   Shi Chengcheng C   Bode Ann M AM   Dong Zigang Z  

Molecular carcinogenesis 20150512 5


Arsenic exposure has been reported to cause neoplastic transformation through the activation of PcG proteins. In the present study, we show that activation of p38α mitogen-activated protein kinase (MAPK) is required for arsenic-induced neoplastic transformation. Exposure of cells to 0.5 μM arsenic increased CRE and c-Fos promoter activities that were accompanied by increases in p38α MAPK and CREB phosphorylation and expression levels concurrently with AP-1 activation. Introduction of short hairp  ...[more]

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