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131-I-TM-601 is investigated in clinical trials for treating brain cancer. 131-I-TM-601 is a solid. Tx binds to and reduces the activity of a matrix metalloproteinase (MMP) that regulates functioning of the chloride channels on cell membranes. TM-601 is a small 36-amino-acid peptide that selectively binds to glioma cells but not normal brain parenchyma. It is a synthetic version of a neurotoxin isolated from the venom of the Giant Yellow Israeli scorpion Leiurus quinquestriatus. The synthetic version of this peptide has been manufactured and covalently linked to iodine 131 ((131)I-TM-601) as a means of targeting radiation to tumor cells in the treatment of brain cancer. The selective effects of TM-601 are regulated by its action on MMP2 receptors.
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