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Astaxanthin enhances pemetrexed-induced cytotoxicity by downregulation of thymidylate synthase expression in human lung cancer cells.
Liao, Kai-Sheng; Wei, Chia-Li; Chen, Jyh-Cheng; Zheng, Hao-Yu; Chen, Wen-Ching; Wu, Chia-Hung; Wang, Tai-Jing; Peng, Yi-Shuan; Chang, Po-Yuan; Lin, Yun-Wei.
Afiliação
  • Liao KS; Department of Pathology, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chiayi, Taiwan; School of Nursing, Chung Jen Junior College of Nursing, Health Science and Management, Chiayi, Taiwan.
  • Wei CL; Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan.
  • Chen JC; Department of Food Science, National Chiayi University, Chiayi, Taiwan.
  • Zheng HY; Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan.
  • Chen WC; Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan.
  • Wu CH; Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan.
  • Wang TJ; Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan.
  • Peng YS; Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan.
  • Chang PY; Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan.
  • Lin YW; Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan. Electronic address: linyw@mail.ncyu.edu.tw.
Regul Toxicol Pharmacol ; 81: 353-361, 2016 Nov.
Article em En | MEDLINE | ID: mdl-27693704
Pemetrexed, a multitargeted antifolate agent, has demonstrated clinical activity in non-small cell lung cancer (NSCLC) cells. Increased expression of thymidylate synthase (TS) is thought to be associated with resistance to pemetrexed. Astaxanthin exhibits a wide range of beneficial effects including anti-cancer and anti-inflammatory properties. In this study, we showed that down-regulating of TS expression in two NSCLC cell lines, human lung adenocarcinoma H1650 and squamous cell carcinoma H1703 cells, with astaxanthin were associated with decreased MKK1/2-ERK1/2 activity. Enforced expression of constitutively active MKK1 (MKK1-CA) vector significantly rescued the decreased TS mRNA and protein levels in astaxanthin-treated NSCLC cells. Combined treatment with a MKK1/2 inhibitor (U0126 or PD98059) further decreased the TS expression in astaxanthin-exposed NSCLC cells. Knockdown of TS using small interfering RNA (siRNA) or inhibiting ERK1/2 activity enhanced the cytotoxicity and cell growth inhibition of astaxanthin. Combination of pemetrexed and astaxanthin resulted in synergistic enhancing cytotoxicity and cell growth inhibition in NSCLC cells, accompanied with reduced activation of phospho-MKK1/2, phopho-ERK1/2, and TS expression. Overexpression of MKK1/2-CA reversed the astaxanthin and pemetrexed-induced synergistic cytotoxicity. Our findings suggested that the down-regulation of MKK1/2-ERK1/2-mediated TS expression by astaxanthin is an important regulator of enhancing the pemetrexed-induced cytotoxicity in NSCLC cells.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Timidilato Sintase / Regulação para Baixo / Regulação Neoplásica da Expressão Gênica / Pemetrexede / Neoplasias Pulmonares / Antineoplásicos Limite: Humans Idioma: En Revista: Regul Toxicol Pharmacol Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Taiwan País de publicação: Holanda

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Timidilato Sintase / Regulação para Baixo / Regulação Neoplásica da Expressão Gênica / Pemetrexede / Neoplasias Pulmonares / Antineoplásicos Limite: Humans Idioma: En Revista: Regul Toxicol Pharmacol Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Taiwan País de publicação: Holanda