Hexahydro-β-acids potently inhibit 12- O -tetradecanoylphorbol 13-acetate-induced skin inflammation and tumor promotion in mice

Chung-Huei Hsu, Yuan-Soon Ho, Ching Shu Lai, Shu Chen Hsieh, Li Hua Chen, Edwin Lin, Chi Tang Ho, Min Hsiung Pan

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16 Citations (Scopus)

Abstract

We previously reported that hexahydro-beta-acids (HBAs), reduced derivatives of beta-acids (BA) from hop (Humulus lupulus L.), displayed more potent anti-inflammatory activity than BA in lipopolysaccharide-stimulated murine macrophages. In this study, we investigated the effects and underlying molecular mechanisms of hexahydro-β-acids (HBAs) on 12-O- tetradecanoylphorbol-13-acetate (TPA)-stimulated mouse skin inflammation and in the two-stage carcinogenesis model. Female ICR mice pretreated with HBA at 1 and 10 μg significantly reduced ear edema, epidermal hyperplasia, and infiltration of inflammatory cells caused by TPA. Molecular analysis exhibited that HBA suppressed iNOS, COX-2, and ornithine decarboxylase (ODC) protein and gene expression through interfering with mitogen-activated protein kinases (MAPKs) and phosphatidylinositiol 3-kinase (PI3K)/Akt signaling as well as the activation of transcription factor NF-κB. Furthermore, application of HBA (1 and 10 μg) prior to each TPA treatment (17.2 ± 0.9 tumors/mouse) resulted in the significant reduction of tumor multiplicity (5.1 ± 1.2, P <0.01 and 2.3 ± 1.2, P <0.001, respectively) in 7,12-dimethyl-benzanthracene (DMBA)-initiated mouse skin. The tumor incidence was significantly lowered to 75% (P <0.05) and 58.7% (P <0.01) by HBA pretreatment, respectively, and significantly reduced the tumor weight (0.34 ± 0.14 g, P <0.01 and 0.09 ± 0.10 g, P <0.001, respectively) as compared to DMBA/TPA-induced tumors (0.76 ± 0.04 g).

Original languageEnglish
Pages (from-to)11541-11549
Number of pages9
JournalJournal of Agricultural and Food Chemistry
Volume61
Issue number47
DOIs
Publication statusPublished - Nov 27 2013

Keywords

  • cyclooxygenase-2 (COX-2)
  • hexahydro-β-acids (HBA)
  • inducible NO synthase (iNOS)
  • inflammation
  • two-stage carcinogenesis

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Chemistry(all)

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