Terrein inhibits keratinocyte proliferation via ERK inactivation and G2/M cell cycle arrest

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Title
Terrein inhibits keratinocyte proliferation via ERK inactivation and G2/M cell cycle arrest
Author(s)
D S Kim; H K Lee; S H Park; Sangku LeeIn Ja RyooWon Gon Kim; Ick Dong Yoo; J I Na; S B Kwon; K C Park
Bibliographic Citation
Experimental Dermatology, vol. 17, no. 4, pp. 312-317
Publication Year
2008
Abstract
Terrein, a fungal metabolite, has been recently shown to have a strong antiproliferative effect on skin equivalents. In the present study, we further investigated the effects of terrein on the possible signalling pathways involved in the growth inhibition of human epidermal keratinocytes by examining the regulations of extracellular signal-regulated protein kinase (ERK) and of the Akt pathway by terrein. It was observed that ERK was inactivated by terrein and that keratinocyte proliferation was inhibited, whereas Akt was unaffected. The inhibition of the ERK pathway by U0126 (a specific ERK inhibitor) also had a dose-dependent antiproliferative effect on human keratinocytes. These results indicate that ERK inhibition is involved in keratinocyte growth inhibition by terrein. Moreover, flow cytometric analysis showed that terrein inhibits DNA synthesis, as evidenced by a reduction in the S phase and an increase in the G2/M phase of the cell cycle. Thus, we next examined changes in the expressions of G2/M cell cycle-related proteins. Terrein was found to downregulate cyclin B1 and Cdc2 without Cdc2 phosphorylation, but upregulated p27KIP1 (p27), a known inhibitor of cyclin-dependent kinase. These results suggest that terrein reduces human keratinocyte proliferation by inhibiting ERK and by decreasing the expressions of cyclin B1 and Cdc2 complex.
Keyword
cell cycleERKkeratinocytesproliferationterrein
ISSN
0906-6705
Publisher
Wiley
DOI
http://dx.doi.org/10.1111/j.1600-0625.2007.00646.x
Type
Article
Appears in Collections:
Ochang Branch Institute > Chemical Biology Research Center > 1. Journal Articles
Division of Research on National Challenges > Infectious Disease Research Center > 1. Journal Articles
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