topoisomerase inhibitor

topoisomerase inhibitor
any one of a class of cytotoxic drug that work by blocking the action of topoisomerase I, an enzyme that promotes the uncoiling of the DNA double helix, which is a necessary preliminary to replication. These drugs include irinotecan (Campto), used for treating advanced colorectal cancer; and topotecan (Hycamtin), for treating advanced ovarian cancer. They are administered by intravenous infusion; <

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any of a group of antineoplastic agents that interfere with the arrangement of DNA in cells.

Medical dictionary. 2011.

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  • Topoisomerase inhibitor — Topoisomerase inhibitors are agents designed to interfere with the action of topoisomerase enzymescite web |url=http://www.cancer.gov/Templates/db alpha.aspx?CdrID=46665 |title=Definition of topoisomerase inhibitor NCI Dictionary of Cancer Terms… …   Wikipedia

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  • topoisomerase inhibitor — any one of a class of cytotoxic drugs that work by blocking the action of topoisomerase I, an enzyme that promotes the uncoiling of the DNA double helix, which is a necessary preliminary to replication. These drugs include irinotecan (CPT11;… …   The new mediacal dictionary

  • Topoisomerase — Topoisomerases (type I: EC 5.99.1.2, type II: EC 5.99.1.3) are enzymes that regulate the overwinding or underwinding of DNA. The winding problem of DNA arises due to the intertwined nature of its double helical structure. For example, during DNA… …   Wikipedia

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  • Type II topoisomerase — Type II topoisomerases cut both strands of the DNA helix simultaneously in order to change the linking number of the molecule. FunctionOnce cut, the ends of the DNA are separated, and a second DNA duplex is passed through the break. Following… …   Wikipedia

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  • Dihydropteroate synthase inhibitor — A dihydropteroate synthetase inhibitor is a drug that inhibits the action of dihydropteroate synthetase. Most are sulfonamides. Tetrahydrofolate synthesis pathway In bacteria, antibacterial sulfonamides act as competitive inhibitors of the enzyme …   Wikipedia

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