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Arsenic sulfide combined with JQ1, chemotherapy agents, or celecoxib inhibit gastric and colon cancer cell growth

Authors Zhang L, Tong Y, Zhang X, Pan M, Chen S

Received 23 July 2015

Accepted for publication 30 September 2015

Published 30 October 2015 Volume 2015:9 Pages 5851—5862


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 4

Editor who approved publication: Prof. Dr. Wei Duan

Lian Zhang,1 Yingying Tong,1 Xiuli Zhang,1 Minggui Pan,2,3 Siyu Chen1

1Department of Oncology, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, People’s Republic of China; 2Department of Oncology and Hematology, Kaiser Permanente Medical Center, Santa Clara, 3Division of Research, Kaiser Permanente, Oakland, CA, USA

Background: Arsenic compounds have modest cytotoxic activity in solid tumors. We investigated if arsenic sulfide (As4S4) in combination with other distinct agents could enhance its cytotoxic activity.
Methods: We used gastric and colon cancer cell lines to study the synergistic effect of As4S4 in combination with BRD4 inhibitor JQ1, or with chemotherapy drug cisplatin and irinotecan or with COX2 inhibitor celecoxib. We investigated the mechanism of the cytotoxic effect of these novel combinations.
Results: We found that when As4S4 was combined with JQ1, cisplatin, irinotecan or celecoxib, its cytotoxic activity was dramatically enhanced in both gastric and colon cancer cell lines. As4S4 and JQ1 inhibited BRD4 and c-Myc while activating p53 expression synergistically. As4S4 inhibited COX2 and cyclin D1 expression. When As4S4 was combined with chemotherapy drug cisplatin or COX2 inhibitor celecoxib, its inhibition of COX2, BCL2, and p38 expression was enhanced. As4S4 and cisplatin synergistically stimulated p53, phosphor-p38 (p-p38), and increased cleaved caspase 3 (c-caspase 3).
Conclusion: As4S4 in combination with JQ1, cisplatin, irinotecan or celecoxib showed enhanced cytotoxic effect on gastric and colon cancer cells, indicating the potential application of these novel drug combinations as part of treatment strategy that warrants further investigation. As4S4 and JQ1 demonstrate synergistic activation of p53 and inhibition of c-Myc. As4S4 and cisplatin and celecoxib activated multiple apoptosis pathways.

Keywords: As4S4, JQ1, cisplatin, irinotecan, celecoxib, gastric cancer, colon cancer

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