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Department of Laboratories, North Shore University Hospital, Manhasset, New York 11030 and Department of Pathology, New York University School of Medicine, New York, New York 10016
Arsenic exhibits a differential toxicity to cancer cells. At a high concentration (>5 µM), As2O3 causes acute necrosis in various cell lines. At a lower concentration (0.55 µM), it induces myeloid cell maturation and an arrest in metaphase, leading to apoptosis. As2O3-treated cells have features found with both tubulin-assembling enhancers (Taxol) and inhibitors (colchicine). Prior treatment of monomeric tubulin with As2O3 markedly inhibits GTP-induced polymerization and microtubule formation in vitro but does not destabilize GTP-induced tubulin polymers. Cross-inhibition experiments indicate that As2O3 is a noncompetitive inhibitor of GTP binding to tubulin. These observations correlate with the three-dimensional structure of ß-tubulin and suggest that the cross-linking of two vicinal cysteine residues (Cys-12 and Cys-213) by trivalent arsenic inactivates the GTP binding site. Furthermore, exogenous GTP can prevent As2O3-induced mitotic arrest.
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