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Topotecan

托普樂肯

Mechanism of action:

Topotecan 是一種拓撲異構酶 I 抑制劑(topoisomerase I inhibitor),屬於喜樹鹼(camptothecin)半合成衍生物。拓撲異構酶 I 的正常功能是在 DNA 複製或轉錄時,暫時切開單股 DNA 釋放扭轉張力,再將 DNA 接回。Topotecan 會與拓撲異構酶 I-DNA 複合體結合,穩定已切開但尚未重新接合的狀態。這些暫時性的單股斷裂在 DNA 複製叉通過時,由於另一股無法承受複製叉前進所造成的張力,硬生被扯段而產生雙股 DNA 斷裂,最終造成細胞凋亡。

​Reference(s):

1. Kollmannsberger C et al. (1999). Topotecan - A novel topoisomerase I inhibitor: pharmacology and clinical experience. Oncology. 


2. Herben VM et al. (1996). Clinical pharmacokinetics of topotecan. Clin Pharmacokinet. 


3. Dennis MJ et al. (1997). An overview of the clinical pharmacology of topotecan. Semin Oncol.

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