Cancer Lett. 2009 Sep 8;282(1):116-23. Epub 2009 Apr 3.

Selenite is a potent cytotoxic agent for human primary AML cells.

Olm E, Jönsson-Videsäter K, Ribera-Cortada I, Fernandes AP, Eriksson LC, Lehmann S, Rundlöf AK, Paul C, Björnstedt M.

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Division of Pathology, Department of Laboratory Medicine, Karolinska Institutet, Karolinska University Hospital, Huddinge F46, Stockholm, Sweden.

Abstract

Selenite is a potent inhibitor of malignant cell growth. Although the cytotoxic effects have been extensively investigated in vitro, there are only a limited number of studies using primary tumor cells with concomitant comparison to conventional drugs. An ex vivo model with primary cells from 39 consecutive patients with acute myeloid leukemia (AML) were exposed to a panel of conventional cytotoxic drugs, and the effects on viability were compared to those of clinically achievable concentrations of selenite. Selenite at 5 microM caused the lowest mean survival of primary tumor cells in the panel of all tested drugs (28.95% CI 18.60-39.30%). The cells showed a significant (p<0.05) correlation in the resistance to all tested conventional AML drugs whereas selenite did not, indicating sensitivity to selenite also in multi drug resistant cells. Exposure to selenite also resulted in an increased mRNA expression of the antioxidant proteins TrxR1 and Grx, while staining for TrxR1 showed decreased protein levels. The results strongly suggest a great potential for selenite in the treatment of multi drug resistant AML.

PMID:: 19345479; [PubMed - indexed for MEDLINE]

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