Date

2011

Author

Güler, Elif

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Cancer is a major health problem in developing world with mostly unsufficient treatment. Cancer prevention through dietary modification appears to be a practical and cost effective possibility. The aim of present study is to investigate the chemical components of “Urtica diocia,L (U. diocia) grown in Turkey” and the possible protective potential of its aqueous extract against breast cancer cell lines. U. diocia was extracted by maceration method which was performed for 6,12, 24, and 36 hours, at 50°C, 37°C, and 25°C for optimization of maceration condition. Total phenol and flavon contents, and radical scavenging activity (RSA) were determined. RSA was determined by DPPH (1,1diphenyl-2-picryl-hydrazil). RSA varied from %15 to %65 in different extracts prepared under different conditions. The highest RSA was found in 12 hour at 25°C extract with %65 RSA value and the (IC50) Inhibitory concentration of 0.30 mg/mL The extract obtained by maceration for 12h at 25°C had the richest flavon content 28.9 ±0.93 mg quercetin equivalent/g lyophilized extract. Phenol content of extracts in terms of gallic acid equivalent (GaE) varied from 28.8± 0.57 to 74.2 ± 2.24mg/g lyophilized extract. 12h at 25°C U. dioica extract had richest phenolic content (74.2± 2.24mg GaE /g lyophilized extract). v The air dried aerial parts of the plant were extracted with methanol for 4 h at 400 C in sonicator. After evaporation of the combined methanol extracts of U.dioica under vacuum, the extract was fractionated with, chloroform, ethyl acetate and n-butanol by partitioning into solvents of increasing polarity. HPLC analyses of phenolic, compounds in n-butanol and ethyl acetate fractions of U.dioica were carried out in Varian ProStar HPLC. HPLC analyses of 12 h at 25°C U. dioica extract (14.4mg/mL) revealed that the extract contained 7.10 -3 mg/mL caffeic acid and 5.10-3 mg/mL quercetin. 3x 10-2mg/mL gallic acid was found in n-butanol fraction of U.dioica. Caffeic and chlorogenic acid were found at 1.9X 10-2 mg/mL in acid macerated extract of urtica dioica L. Cytotoxic effect of urtica dioica L in MCF-7 and MDA-231 cellls were investigated by using XTT Cell Proliferation assays which showed that urtica diocia L treatment for 48 hours caused a concentration dependent decrease in viable cell numbers. In vitro effects of U. diocia extracts on crude sheep liver cytosolic glutathione- S-transferase was also studied and have shown effective inhibition on cytosolic GST activity, with an IC50 of 75 nmoles/min/g protein. Total phenol and flavon content, and radical scavenging activity (RSA) were also determined to survey antioxidant potential of U. diocia acid extracts.

Subject Keywords

Cancer cells.

URI

http://etd.lib.metu.edu.tr/upload/12613843/index.pdf
https://hdl.handle.net/11511/21114

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Graduate School of Natural and Applied Sciences, Thesis