Mechanistic basis of a combination d-penicillamine and platinum drugs synergistically inhibits tumor growth in oxaliplatin-resistant human cervical cancer cells in vitro and in vivo

Szu Jung Chen, Ching Chuan Kuo, Hsin Yi Pan, Tsui Chun Tsou, Szu Ching Yeh, Jang Yang Chang

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The platinum-based regimen is the front-line treatment of chemotherapy. However, development of platinum resistance often causes therapeutic failure in this disease. We previously have generated an oxaliplatin-resistant subline, named S3, from human cervical carcinoma SiHa cells, and its resistant phenotype was well-characterized. In the present study, we aimed to identify the novel therapeutic strategy by combining copper chelator d-penicillamine with oxaliplatin, and to elucidate the underlying mechanisms for overcoming oxaliplatin resistance. As the result, d-penicillamine exerted synergistic killing effects only in S3 cells when combined with oxaliplatin and cisplatin by using Chou-Talalay method. Further study showed that the amounts of platinum DNA adduct formed were positively correlated to the percentage of cell death in S3 cells when co-treated d-penicillamine with oxaliplatin and cisplatin. d-penicillamine promoted copper influx transporter hCtr1 expression through upregulation of Sp1. Sp1 overexpression induced p53 translocation from nucleus to cytosol and caused p53 degradation through ubiquitination, which subsequently suppressed the expression of the copper efflux transporter ATP7A. Importantly, co-treatment of cisplatin with d-penicillamine enhanced oxaliplatin-elicited antitumor effect in the oxalipatin-resistant S3 xenograft tumors, but not found in SiHa xenograft model. Notably, Mice received d-penicillamine alone or in combination of d-penicillamine ad oxalipatin, increased hCtrl protein level in S3 xenograft tumor, however, the protein level of ATP7A was decreased. Taken together, this study provides insight into that the co-manipulation of hCtrl and ATP7A by d-penicillamine could increase the therapeutic efficacy of platinum drugs in oxaliplatin resistant tumors, especially in resistant phenotype with downexpression of hCtrl and overexpression of ATP7A.

Original languageEnglish
Pages (from-to)28-37
Number of pages10
JournalBiochemical Pharmacology
Volume95
Issue number1
DOIs
Publication statusPublished - 2015 May 1

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Pharmacology

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