Lithium detaches hexokinase from mitochondria and inhibits proliferation of B16 melanoma cells

Glycolysis is known to be the primary energy source in cancer cells. Hexokinase (ATP: D-hexose 6phosphotransferase, EC 2.7.1.1), the only glycolytic enzyme which binds to mitochondria, is exceptionally high in cancer cells, and believed to play a key role in regulating cell energy metabolism and cancer cell growth rate. We show here that lithium induces a detachment of hexokinase from mitochondria of B16 melanoma cells. This effect eventually leads to inhibition of cell proliferation. These results reveal a novel, additional, mechanism of action of lithium and suggest that lithium may be promising drug in treatment of melanoma.