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Caffeic acid directly targets ERK1/2 to attenuate solar UV-induced skin carcinogenesis

Ge Yang1, Yang Fu2, Margarita Malakhova3

  • 1The Hormel Institute, University of Minnesota, Austin, Minnesota. Physiology and Pathophysiology, Basic Medical College, Zhengzhou University, ZhengZhou, China. The First Affiliated Hospital of Zhengzhou University, ZhengZhou, China.

Cancer Prevention Research (Philadelphia, Pa.)
|August 9, 2014
PubMed

Insights

Caffeic acid, a coffee phytochemical, inhibits skin cancer development by targeting ERK1 and ERK2 signaling pathways. This study reveals its chemopreventive potential against UV-induced skin carcinogenesis.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Dermatology

Background:

  • Caffeic acid (3,4-dihydroxycinnamic acid) is a phenolic compound found in coffee with reported anticancer properties.
  • The precise molecular mechanisms and protein targets underlying caffeic acid's chemopreventive effects, particularly against skin carcinogenesis, remain largely unelucidated.

Purpose of the Study:

  • To investigate the molecular mechanisms by which caffeic acid suppresses skin carcinogenesis.
  • To identify the specific protein targets of caffeic acid involved in inhibiting cancer cell proliferation and transformation.

Main Methods:

  • Assessed caffeic acid's effects on human skin cancer cell colony formation and HaCaT cell neoplastic transformation.
  • Utilized a solar UV (SUV)-induced skin carcinogenesis mouse model to evaluate topical caffeic acid application.
  • Analyzed mitogen-activated protein kinase (MAPK) signaling phosphorylation levels in treated mice.
  • Performed in vitro kinase assays and determined the co-crystal structure of ERK2 complexed with caffeic acid.
  • Investigated the role of ERK2 in cancer cell sensitivity to caffeic acid using knockdown experiments in a xenograft model.

Main Results:

  • Caffeic acid dose-dependently inhibited skin cancer cell colony formation and UV-induced neoplastic transformation.
  • Topical caffeic acid application significantly reduced tumor incidence and volume in the mouse skin carcinogenesis model.
  • Treatment with caffeic acid led to a notable reduction in MAPK signaling phosphorylation.
  • Caffeic acid directly interacted with and inhibited the activity of ERK1/2 kinases in vitro.
  • The co-crystal structure revealed caffeic acid binding to specific residues (Q105, D106, M108) on ERK2.
  • ERK2 knockdown rendered cancer cells insensitive to caffeic acid's effects in vivo.

Conclusions:

  • Caffeic acid exhibits significant chemopreventive activity against solar UV-induced skin carcinogenesis.
  • The primary mechanism involves the direct targeting and inhibition of ERK1 and ERK2 signaling pathways.
  • Caffeic acid represents a potential therapeutic agent for the prevention of skin cancer.

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