Abstract
<div>Abstract<p>ML-133 is a novel small molecule with potent antiproliferative activity, as shown in cancer cell lines and in a human colon tumor xenograft model. ML-133 reduces the concentration of intracellular labile zinc in HT-29 colon cancer cells, leading to induction of the Krüppel-like factor 4 transcription factor. Krüppel-like factor 4 displaces the positive regulator SP1 from the cyclin D1 promoter, thereby negatively regulating the expression of cyclin D1 and promoting the G<sub>1</sub>-S phase arrest of cell proliferation. The antiproliferative and antitumor activity of ML-133 described in the present study suggests modulation of intracellular zinc homeostasis as a potential strategy for the treatment of several cancer types, and ML-133 represents a promising new class of antitumor agents that deserves further development. [Mol Cancer Ther 2009;8(9):2586–96]</p></div>
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