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KMID : 1034820170130020189
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Molecular & Cellular Toxicology
2017 Volume.13 No. 2 p.189 ~ p.196
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PGA2 induces the expression of HO-1 by activating p53 in HCT116 cells
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Lee Hye-In
Lee Sang-Sun
Park Ji-Young
Choe Yun-Jeong
Lee Sun-Young
Kim Ho-Shik
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Abstract
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Prostaglandin (PG) A2 which is a cytotoxic PG, was reported to induce the expression of heme oxygenase (HO)-1 via activation of p38MAPK to keep U2OS cells from cell cycle arrest in G2M phase. The expression of HO-1 is primarily regulated at the level of transcription. But the transcription factors that are responsible for PGA2-induced HO-1 expression were not clarified yet. Here, we report that PGA2-induced transcription of HO-1 is mediated by p53, a tumor suppressive transcription factor. In HCT116 cells, PGA2 treatment led to the phosphorylation of p53 and an increase of p21WAF1 transcription as well as the activation of HO-1 transcription. Knocking p53 down via RNA interference or inhibiting the p53’s transcriptional activity by pifithrin-α treatment led to suppression of the increase in the level of both HO-1 expression and activity of HO-1 promoter. Pretreatment of NU-7441, a chemical inhibitor of DNA-activated protein kinase (DNA-PK), prevented both the PGA2-induced phosphorylation of p53 and an increase of HO-1 transcription. In addition, N-acetyl-l-cysteine, a scavenger of reactive oxygen species (ROS), also mimicked the effect of NU-7441 on the PGA2-induced activation of p53 and HO-1 transcription. Collectively, these results suggest that PGA2 induces the expression of HO-1 via activation of p53, which is mediated by the ROS-DNA-PK pathway.
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KEYWORD
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Prostaglandin A2, Heme oxygenase-1, Tumor suppressor protein p53, Reactive oxygen species, DNA-activated protein kinase
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