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Teucrium Plant Species as Natural Sources of Novel Anticancer Compounds: Antiproliferative, Proapoptotic and Antioxidant Properties

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Author(s): Milan S. Stankovic | Milena G. Curcic | Jovana B. Zizic | Marina D. Topuzovic | Slavica R. Solujic | Snezana D. Markovic

Journal: International Journal of Molecular Sciences
ISSN 1422-0067

Volume: 12;
Issue: 7;
Start page: 4190;
Date: 2011;
Original page

Keywords: acridin orange/ethidium bromide assay | antiprolifertative activity | antioxidants | MTT assay | phenols | Teucrium

ABSTRACT
This study deals with total phenolic content, antiproliferative and proapoptotic activity of methanolic extracts from different Teucrium species and the effect on the prooxidant/antioxidant status in HCT-116 cells. The total phenolic content of the extracts was measured spectrophotometricaly and the obtained results ranged from 56.62 mg/g to 172.50 mg GA/g. The antiproliferative activity of methanolic extracts from different Teucrium species was determined using MTT cell viability assay, where IC50 value was used as a parameter for cytotoxicity. The type of cell death was explored by fluorescence microscopy using the acridin orange/ethidium bromide method. MTT assay showed that all extracts significantly reduced cell viability in a dose-dependent manner, with very low IC50 values. The highest content of phenolic compounds and the best cytotoxic activity on HCT-116 cells after 24 h of exposure was in T. chamaedrys extract, with IC50 values of 5.48 × 10−9 µg/mL. After 72 h, methanolic extract of T. arduini appeared to have the best cytotoxic activity on HCT-116, with IC50 values of 0.37 µg/mL. Treatments caused typical apoptotic morphological changes in HCT-116 cells and showed a high percentage of apoptotic cells. The results of the presented research indicate that some Teucrium extracts are a very rich source of phenols, which may directly contribute to high antiproliferative and proapoptotic activity.

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Tangokurs Rapperswil-Jona

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