6-shogaol is more effective than 6-gingerol and curcumin in inhibiting 12-O-tetradecanoylphorbol 13-acetate-induced tumor promotion in mice

Hou Wu, Min Chi Hsieh, Chih Yu Lo, Cheng Bin Liu, Shengmin Sang, Chi Tang Ho, Min Hsiung Pan

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

We previously reported that 6-shogaol strongly suppressed lipopolysaccharide-induced overexpression of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) in murine macrophages. In this study, we further compared curcumin, 6-gingerol, and 6-shogaol's molecular mechanism of action and their anti-tumor properties. We demonstrate that topical application of 6-shogaol more effectively inhibited 12-O-tetradecanoylphorbol 13-acetate (TPA)-stimulated transcription of iNOS and COX-2 mRNA expression in mouse skin than curcumin and 6-gingerol. Pretreatment with 6-shogaol has resulted in the reduction of TPA-induced nuclear translocation of the nuclear factor-κB subunits. 6-Shogaol also reduced TPA-induced phosphorylation of IκBα and p65, and caused subsequent degradation of IκBα. Moreover, 6-shogaol markedly suppressed TPAinduced activation of extracellular signal-regulate kinase1/2, p38 mitogen-activated protein kinase, JNK1/2, and phosphatidylinositol 3-kinase/Akt, which are upstream of nuclear factor-κB and AP-1. Furthermore, 6-shogaol significantly inhibited 7,12-dimethylbenz[a]anthracene/TPA-induced skin tumor formation measured by the tumor multiplicity of papillomas at 20wk. Presented data reveal for the first time that 6-shogaol is an effective anti-tumor agent that functions by down-regulating inflammatory iNOS and COX-2 gene expression in mouse skin. It is suggested that 6-shogaol is a novel functional agent capable of preventing inflammation-associated tumorigenesis.

Original languageEnglish (US)
Pages (from-to)1296-1306
Number of pages11
JournalMolecular Nutrition and Food Research
Volume54
Issue number9
DOIs
StatePublished - Sep 2010

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Food Science

Keywords

  • 12-O-tetradecanoylphorbol 13-acetate
  • 6-Shogaol
  • Inflammation
  • Skin cancer
  • Two stage skin carcinogenesis

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