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Molecules 2009, 14(2), 738-754; doi:10.3390/molecules14020738

Ethanolic Extract of Propolis (EEP) Enhances the Apoptosis- Inducing Potential of TRAIL in Cancer Cells

Chair and Department of Microbiology and Immunology, Jordana 19, 41 808 Zabrze Medical University of Silesia in Katowice, Poland
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Received: 28 November 2008 / Revised: 20 January 2009 / Accepted: 31 January 2009 / Published: 13 February 2009
(This article belongs to the Special Issue Phenolics and Polyphenolics)
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Abstract

Ethanolic extract of propolis (EEP) is one of the richest sources of phenolic acids and flavonoids. EEP and its phenolic compounds have been known for various biological activities including immunopotentiation, chemopreventive and antitumor effects. Tumor necrosis factor related apoptosis inducing ligand (TRAIL) is a naturally occurring anticancer agent that preferentially induces apoptosis in cancer cells and is not toxic toward normal cells. We examined the cytotoxic and apoptotic effect of EEP and phenolic compounds identified in propolis in combination with TRAIL on HeLa cancer cells. HeLa cells were resistant to TRAIL-induced apoptosis. Our study demonstrated that EEP and its components significantly sensitize to TRAIL induced death in cancer cells. The percentage of the apoptotic cell after exposure to 50 μg/mL EEP and 100 ng/mL TRAIL increased to 71.10±1.16%. The strongest cytotoxic effect in combination with TRAIL on HeLa cells exhibited apigenin and CAPE at the concentration of 50 μM (58.87±0.75% and 49.59±0.39%, respectively). In this report, we show for the first time that EEP markedly augmented TRAIL mediated apoptosis in cancer cells and confirmed the importance of propolis in chemoprevention of malignant tumors.
Keywords: Propolis and its phenolic compounds; TRAIL; Cancer cells; Apoptosis; Chemopreventive effect; Antitumor activity Propolis and its phenolic compounds; TRAIL; Cancer cells; Apoptosis; Chemopreventive effect; Antitumor activity
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Szliszka, E.; Czuba, Z.P.; Domino, M.; Mazur, B.; Zydowicz, G.; Krol, W. Ethanolic Extract of Propolis (EEP) Enhances the Apoptosis- Inducing Potential of TRAIL in Cancer Cells. Molecules 2009, 14, 738-754.

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