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Updated: May 4, 2026

Chemical-Induced Skin Carcinogenesis Model Using Dimethylbenz[a]Anthracene and 12-O-Tetradecanoyl Phorbol-13-Acetate DMBA-TPA
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Chemical-Induced Skin Carcinogenesis Model Using Dimethylbenz[a]Anthracene and 12-O-Tetradecanoyl Phorbol-13-Acetate DMBA-TPA

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Naturally occurring phenolic acids modulate TPA-induced activation of EGFR, AP-1, and STATs in mouse epidermis

Michał Cichocki1, Miłosz Dałek, Mateusz Szamałek

  • 1a Department of Pharmaceutical Biochemistry , Poznan University of Medical Sciences , Poznań , Poland.

Nutrition and Cancer
|January 2, 2014
PubMed

Insights

Naturally occurring phenolic acids inhibit tumor development by blocking key signaling pathways. These compounds, like tannic and protocatechuic acid, reduce epidermal growth factor receptor (EGFR) and activator protein-1 (AP-1) activation, and inhibit signal transducers and activators of transcription (STATs).

Area of Science:

  • Oncology
  • Molecular Biology
  • Natural Products Chemistry

Background:

  • Epidermal growth factor receptor (EGFR) is crucial in epithelial carcinogenesis and STATs activation.
  • Tumor promoters like 12-O-tetradecanoylphorbol-13-acetate (TPA) activate EGFR, AP-1, and STATs pathways in the epidermis.
  • Naturally occurring phenolic acids are investigated for their potential to modulate these cancer-related signaling pathways.

Purpose of the Study:

  • To investigate the interference of phenolic acids with EGFR, AP-1, and STATs pathways activated by TPA in mouse epidermis.
  • To determine the specific effects of tannic acid, chlorogenic acid, and protocatechuic acid on these signaling cascades.
  • To elucidate the potential of phenolic acids in inhibiting tumor development by modulating these pathways.

Main Methods:

  • Topical application of TPA to Balb/c mice epidermis.
  • Pretreatment with naturally occurring phenolic acids (tannic, chlorogenic, protocatechuic acid).
  • Analysis of EGFR phosphorylation (Y-1068, Y-1173), AP-1 activation, c-Jun levels, JNK activity, and STATs activation.

Main Results:

  • Tannic and chlorogenic acids significantly decreased EGFR phosphorylation and AP-1 activation.
  • Tannic acid reduced c-Jun levels and binding to the TPA response element (TRE).
  • Protocatechuic acid inhibited STATs activation and increased JNK activity, while other phenolics primarily affected the EGFR/AP-1 pathway.

Conclusions:

  • Naturally occurring phenolic acids can inhibit tumor development by modulating EGFR, AP-1, and STATs activation.
  • Complex phenolics primarily target the EGFR/AP-1 pathway.
  • Simple phenolic compounds, like protocatechuic acid, are particularly effective inhibitors of STATs activation.

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