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Planta Med 2010; 76(10): 963-968
DOI: 10.1055/s-0029-1240900
Pharmacology
Original Papers
© Georg Thieme Verlag KG Stuttgart · New York

The Potential Mechanism of Tiliroside-Dependent Inhibition of t-Butylhydroperoxide-Induced Oxidative Stress in Endometrial Carcinoma Cells

Michal Tomczyk1 , Aleksander Tumanov2 , Agnieszka Zaniewska3 , Arkadiusz Surazynski3
  • 1Department of Pharmacognosy, Faculty of Pharmacy, Medical University of Białystok, Poland
  • 2Institute for Pharmacology and Biochemistry, National Academy of Sciences, Grodno, Belarus
  • 3Department of Medicinal Chemistry, Faculty of Pharmacy, Medical University of Białystok, Poland
Further Information

Publication History

received July 27, 2009 revised January 14, 2010

accepted January 26, 2010

Publication Date:
25 February 2010 (online)

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Abstract

The effects of oxidative stress on collagen and DNA biosynthesis, β-galactosidase activity, the expression of the β-integrin receptor, FAK, the insulin-like growth factor-I receptor (IGF‐IR), the hypoxia-inducible factor-1 (HIF-1), and the mitogen-activated protein kinases (MAP/ERK1, ERK2) were evaluated in human endometrial carcinoma cells. Subconfluent cells were subjected to oxidative stress with 30 µM t-butylhydroperoxide (t-BHP) for 1 h per day over the course of 5 days. It was found that oxidative stress contributed to an increase in the β-galactosidase activity as well as to the inhibition of collagen and DNA biosynthesis. The mechanism of the process was found at the level of IGF‐IR and HIF-1α. An increase in the expression of HIF-1α and a decrease in the expression of IGF‐IR were observed in the cells subjected to oxidative stress. The role of IGF‐IR signalling in the process was confirmed by an experiment showing downregulation of MAP kinases ERK1 and ERK2 expression in the studied cells. This phenomenon is probably responsible for the drastic inhibition of protein (up to 40 % of control) and DNA biosynthesis (up to 65 % of control) in the cells. An addition of tiliroside to the cells medium restored all parameters to the control level, including IGF‐IR and HIF-1α expressions. The data suggest that the antioxidative activity of tiliroside isolated from Potentilla argentea may originate at the level of IGF‐IR and HIF-1α signalling.

Key words

IGF‐I receptor - MAPK - HIF‐1α - oxidative stress - tiliroside - Potentilla argentea - Rosaceae

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Arkadiusz Surażyński

Department of Medicinal Chemistry
Faculty of Pharmacy
Medical University of Białystok

ul. Kilińskiego 1

15–089 Białystok

Poland

Phone: + 48 8 57 48 57 04

Fax: + 48 8 57 48 54 16

Email: arek@umwb.edu.pl

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