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The cytotoxicity of seven Teucrium species, a long time ago used as a food spices, for beverages and teas preparing, as well as therapeutics for digestive and respiratory diseases, were examined against human cervix adenocarcinoma HeLa, human melanoma Fem-x, human chronic myelogenous leukemia K562 and human breast adenocarcinoma MDA-MB-361 cells. MTT assay was used for determination of target cell survival. The most prominent cytotoxic effect was observed against K562 cells, especially by T. scordioides, T. montanum and T. botrys. All Teucrium extracts showed good cytotoxic activity on HeLa cells, but very low cytotoxic effect on MDA-MB-361 cells. In addition, the cytotoxic activities of T. scordioides and T. montanum extract were tested on healthy resting and phytohaemagglutinin-stimulated peripheral blood mononuclear cells (PHA-stimulated PBMC). T. scordioides and T. montanum extracts at concentration of 200 Âµg/ml reduced the resting PBMC and PHA-stimulated PBMC survival up to 10% and 20%, while the reduction of K562 cell survival at the same concentration of extracts was 94% and 97%, respectively. These results point to selectivity in their antitumor actions. Teucrium species can be regarded as promising candidates for natural plant sources of effective biological compounds as a supplements in the food industry, as well as for therapeutic use.

New Values of Teucrium species: in Vitro Study of Cytotoxic Activities of Secondary Metabolites