产品
编 号:F516801
分子式:C36H50ClN3O10S
分子量:752.31
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1mg
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5mg
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生物活性:
S-methyl DM1 is a thiomethyl derivative of Maytansine. S-methyl DM1 binds to tubulin with a Kd of 0.93 μM and inhibts microtubule polymerization. S-methyl DM1 potently suppresses microtubule dynamic instability and has anticancer effects.

体外研究:
S-methyl DM1 is the primary cellular or liver metabolite of antibody-maytansinoid conjugates prepared with thiol-containing maytansinoids DM1. The half-maximal concentration for inhibition of microtubule assembly for for S-methyl DM1 is 4 μM. At 100 nM S-methyl-DM1 (84%) suppresses dynamic instability more strongly than Maytansine (45%). Tritiated S-methyl-DM1 bound to 37 high-affinity sites per microtubule (Kd of 0.1 μM). The concentration dependence curves for the inhibition of cell proliferation by S-methyl DM1 is sigmoidal in shape in MCF7 cells. Minimal inhibition occurred at200 pM S-methyl DM1, and inhibition is maximal at 3 nM. S-methyl DM1 (IC50 of 330 pM) is slightly more potent than Maytansine (IC50 of 710 pM). S-methyl DM1 induces maxima of 80% accumulation of cells in G2/M as compared with only 30% in controls in MCF7 cells.
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