结合
伊立替康
前药
化学
牛血清白蛋白
MTT法
体外
喜树碱
活性代谢物
连接器
渗滤
色谱法
药理学
代谢物
生物化学
结直肠癌
癌症
医学
膜
内科学
数学分析
操作系统
微滤
计算机科学
数学
作者
Yuqin Yao,Xiaolan Su,Yongmei Xie,Yuxi Wang,Tai‐Ran Kang,Lantu Gou,Yi Chen,Jinliang Yang
出处
期刊:Anti-Cancer Drugs
[Ovid Technologies (Wolters Kluwer)]
日期:2013-03-01
卷期号:24 (3): 270-277
被引量:18
标识
DOI:10.1097/cad.0b013e32835c3543
摘要
7-Ethyl-10-hydroxycamptothecin (SN38), the active metabolite of irinotecan, exerts a 100-fold to 1000-fold higher effect than irinotecan itself against several tumor cell lines. However, the water insolubility of SN38 has prevented its direct use as an antitumor drug in the clinic. To improve the water solubility and antitumor efficacy, SN38 was covalently attached to the only free sulfhydryl at cysteine-34 on the BSA site specifically through a thiol-binding linker to form a prodrug BSA-SN38 conjugate (BSA : SN38=1 : 1). The water solubility of this conjugate was similar to albumin using the current method. Also, SN38 loading in this conjugate became controllable. Size-exclusion chromatography purification and UV characterization of the SDS-PAGE electrophoresis product were carried out. Then, an MTT assay was carried out to test the antitumor effect of this conjugate on five colon cancer cell lines in vitro. The 72 h IC50 values of the BSA-SN38 conjugate ranged from 1.5 to 6.1 μmol/l. A colorectal peritoneal carcinomatosis model in mice was established to determine the intraperitoneal chemotherapy effect of the BSA-SN38 conjugate. The BSA-SN38 conjugate at an SN38 equivalent dose of 10 mg/kg/day was administrated every 4 days. Eighteen days after manipulation, the mice were euthanized and the tumors in the abdominal cavity were collected and weighed. Tumors in the BSA-SN38 conjugate treatment group (m=0.21 ± 0.15 g) were found to be significantly (P=5) lighter than those in the NS control group (m=4.74±0.73 g). The results indicated that this water-soluble BSA-SN38 conjugate exerted a strong antitumor effect on colorectal carcinoma.
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