Abstract
Lithium has been an FDA-approved and preferred drug for the treatment of mood disorders for many years, and cumulative evidence has pointed towards its potential use as an anti-cancer agent. Previous studies in our laboratory have demonstrated that lithium induces apoptotic cell death in HL-60 promyelocytes at concentrations of 10 mM and above. A lithium-tolerant HL-60 sub-clone, resistant to up to 15 mM lithium, was also generated and its growth profile reported. Treatment of cells with lithium resulted in a dose-dependent induction of p53, retinoblastoma (Rb) and bax expression which was accompanied by concomitant inhibition of bcl-2 expression as demonstrated using immunohistochemical microscopy. These results seem to suggest that lithium induced cell death in these cells by inhibiting expression of anti-apoptotic protein, bcl-2, while inducing higher expression of its pro-apoptotic counterparts which include bax. Expression of bax and bcl-2 is also linked to expression of inflammation-regulating cytokines. Using ELISA assays, lithium was demonstrated to induce production of pro-inflammatory cytokines, IL-6 and TNF-α, while inhibiting release of anti-inflammation-related IL-2 and IL-10 in a dose-dependent fashion. Our findin...Continue Reading
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