Oncotarget

Research Papers:

Antitumor activity of HPA3P through RIPK3-dependent regulated necrotic cell death in colon cancer

Eugene Cho, Jong-Kook Lee, Eunji Park, Chang Ho Seo, Tudor Luchian and Yoonkyung Park _

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Oncotarget. 2018; 9:7902-7917. https://doi.org/10.18632/oncotarget.24083

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Abstract

Eugene Cho1, Jong-Kook Lee1, Eunji Park1, Chang Ho Seo2, Tudor Luchian3 and Yoonkyung Park1,4

1Department of Biomedical Science, Chosun University, Gwangju, Korea

2Department of Bioinformatics, Kongju National University, Kongju, Korea

3Department of Physics, Alexandru I. Cuza University, Iasi, Romania

4Research Center for Proteinaceous Materials (RCPM), Chosun University, Gwangju, Korea

Correspondence to:

Yoonkyung Park, email: y_k_park@chosun.ac.kr

Keywords: HPA3P; peptide; necroptosis; RIPK3; antitumor activity

Received: July 27, 2017     Accepted: January 02, 2018     Published: January 09, 2018

ABSTRACT

The antimicrobial peptide HPA3 shows anticancer activity in gastric cancer and leukaemia. However, how HPA3 exerts its anticancer activity, as well as whether it also exhibits activity in other cancers, remains unknown. Therefore, the aim of this study was to evaluate the anticancer activity of HPA3 and its analogues in colon cancer and to elucidate the mechanisms responsible for this activity. HPA3P decreased cell viability, whereas HPA3 and HPA3P2 did not decrease cell viability in colon cancer cells compared with control cells. This reduction in cell viability occurred through necrosis, a conclusion supported by our observation of the release of cellular contents, our intracellular PI staining results, and our observation of the release of HMGB1. Moreover, RIPK3 inhibition blocks the reduction of cell viability by HPA3P. Consistent with this finding, we found that knocking down RIPK3 and MLKL, key necroptosis proteins, attenuates the reductions in cell viability induced by HPA3P. Furthermore, HPA3P can improve the anticancer activity of chemotherapeutic agents and exhibits anticancer activity in other cancer cells. These results suggest that HPA3P may have potential as an anticancer agent in the treatment of colon cancer.


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