ABSTRACT Background: Daphne Mucronata extract has a decreasing effect on the size of breast adenocarcinoma in rats. So in this study, the effect of Daphne Mucronata purified diterpene were investigated on co culture of human monocytes and two human leukemia cell lines (K562, CCRF-CEM). Materials and Methods: Each cell line mono-layer culture, in log phase growth, was treated with 10 to 160 μL of the extract (1 g/ml leave powder) and purified compound (0.94 nM). For a comparative study, Taxol (5 to 40 μM) was used in the presence and absence of LPS. Human monocytes were isolated by adhesion method. TNF-α in cultured media were measured by sensitive biotin-streptoavidin ELISA method. Results: Fifty percent of growth inhibition was shown by 160 μL (1:100 dilution, 0.5 g of the powdered leaves/ml) of the extract and 0.94 nM of the purified component, and there was more inhibition in K562 cells (P < 0.05). Four fold increases in growth inhibition was shown in co culture of isolated human monocytes and leukemia cell lines. There was a direct relationship between monocytes TNF-α secretion and growth inhibition degree. Conclusion: Daphne Mucronata extract and its purified diterpene through increasing monocytes TNF-α releasing, potentially inhibit Leukemia cell line.
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