Topoisomerase Inhibition (Topo Inhibition)

Topoisomerase inhibition refers to the process of blocking the activity of topoisomerases, which are essential enzymes that regulate DNA topology during critical cellular processes such as replication, transcription, and recombination. There are two main types of topoisomerases targeted by inhibitors: Topoisomerase I (Top1) and Topoisomerase II (Top2). Inhibitors block the action of topoisomerases, leading to accumulation of DNA damage. This results in persistent DNA breaks that can trigger cell cycle arrest or apoptosis. Many topoisomerase inhibitors are used as chemotherapeutic agents due to their ability to induce lethal DNA damage selectively in rapidly dividing tumor cells.

Other names

Topoisomerase I InhibitionTopoisomerase II InhibitionDNA Topoisomerase Inhibition

Inhibitors block the action of topoisomerases, leading to accumulation of DNA damage by stabilizing the enzyme-DNA cleavage complex at single-stranded or double-stranded nicks, preventing re-ligation or strand passage. This results in persistent DNA breaks that can trigger cell cycle arrest or apoptosis.