Polyphenols are one of most important
phytochemicals distributing in herb plants, vegetables and fruits, which known as important
anticancer agents. Given the high incidence and mortality of
skin cancer, this study aimed to uncover the chemopreventive effects of
polyphenols against
skin cancer metastasis. Electronic databases including Scopus, PubMed, and Cochrane library were used to compile the literature from 2000 to August 2019. Only in vivo mechanistic studies with English full-texts were chosen for this review.
Polyphenols were included in this study if they were administered in purified form; while total extract and fractions were excluded. Among the 8254 primarily selected papers, only a final number of 34 studies were included. The chemopreventive effects of
polyphenols as
anthocyanins, ellagitanins, EGCG, oleuropeindihydroxy phenyl,
punicalagin,
quercetin,
resveratrol and
theaflavin, were mainly examined in treatment of
melanoma as the highly metastatic form of this cutaneous
cancer. Those properties are mediated by modulation of angiogenesis, apoptosis,
inflammation,
metastasis, proliferation, pathways such as EGFR/MAPK, mTOR/PI3K/Akt, JAK/STAT, FAK/RTK2,
PGE-2/
VEGF,
PGE-1/ERK/HIIF-1α, and modulation of related signals including NF-κB, P21WAF/CIP1, Bim, Bax, Bcl2, Bclx, Bim, Puma, Noxa, ILs and
MMPs. Chemopreventive effects of
polyphenols are mediated by several signaling pathways against skin
carcinogenesis and
metastasis, implying the importance of
polyphenols to open up new horizons in development of anti-
skin cancer therapeutic strategies.