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Imatinib

伊馬替尼
Mechanism of action:
Imatinib 是一種酪胺酸激酶抑制劑(tyrosine kinase inhibitor)。在慢性骨髓性白血病(chronic myelogenous leukemia)中,9;22 染色體轉位產生 BCR-ABL 融合基因(費城染色體)。該融合蛋白具有持續活化的酪胺酸激酶活性,不受正常調控,驅動白血病細胞無限制增殖。Imatinib 會結合於 ABL 激酶的 ATP 結合位點,將其鎖定在不活化構形,阻止磷酸化反應與下游訊號傳遞。這會使下游的 RAS-MAPK、PI3K-AKT、JAK-STAT 等路徑無法被活化,導致腫瘤細胞停止增殖並進入凋亡。
Reference(s):
1. Deininger MW et al. (2003). Specific targeted therapy of chronic myelogenous leukemia with imatinib. Pharmacol Rev.
2. Vigneri P et al. (2001). Induction of apoptosis in chronic myelogenous leukemia cells through nuclear entrapment of BCR-ABL tyrosine kinase. Nat Med.
3. Droogendijk HJ et al. (2006). Imatinib mesylate in the treatment of systemic mastocytosis: a phase II trial. Cancer.
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