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Mercaptopurine

巰嘌呤
Mechanism of action:
Mercaptopurine 是一種硫嘌呤(thiopurine)衍生物。Mercaptopurine 本身為前驅藥,進入細胞後經次黃嘌呤-鳥嘌呤磷酸核苷轉移酶(hypoxanthine-guanine phosphoribosyltransferase,HGPRT)轉化為硫代肌苷單磷酸(thioinosine monophosphate),再進一步形成多種活性硫嘌呤核苷酸。這些活性硫嘌呤核苷酸能抑制嘌呤合成相關酵素的活性,導致 IMP、AMP、GMP 合成下降,使細胞無法獲得足夠的嘌呤原料進行 DNA 與 RNA 合成。
Reference(s):
1. Dubinsky MC et al. (2004). Azathioprine, 6-mercaptopurine in inflammatory bowel disease: pharmacology, efficacy, and safety. Clin Gastroenterol Hepatol.
2. Zhou Y et al. (2024). TTD: Therapeutic Target Database describing target druggability information. Nucleic Acids Res.
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