title: Anti-proliferative and apoptosis-inducing effects of camptothecin-20(s)-O-(2-pyrazolyl-1)acetic ester in human breast tumor MCF-7 cells.
abstract: Camptothecin-20(s)-O-(2-pyrazolyl-1)acetic ester (CPT6) is a novel semi-synthetic analog of camptothecin. In a previous report, CPT6 possessed higher cytotoxic activity in vitro towards human breast tumor MCF-7 cells than topotecan. In this study, the antitumor activity of CPT6 on the human breast tumor MCF-7 cell line was analyzed using the MTT method. The underlying mechanism of CPT6 action was investigated by analyzing the cell cycle distribution, apoptotic proportion, changes in mitochondrial membrane potential, and intracellular Ca2+ concentration using flow cytometry. Nuclear and mitochondrial morphologies were also observed by laser scanning confocal and transmission electron microscopy. DNA damage was observed in MCF-7 cells treated with CPT6. Low-dose CPT6 had a significant cytotoxic effect and could inhibit proliferation and induce apoptosis in MCF-7 cells, possibly through cell nucleus fragmentation and DNA damage. CPT6 thus appears to display potent antitumor activity against human breast tumor MCF-7 cells via the induction of apoptosis, and may be a useful alternative drug for breast cancer therapy.
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, China. chuchu@zjut.edu.cn.
authors.forename: Chu
authors.initials: C
authors.lastname: Chu
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, China. fantasticxu@sina.cn.
authors.forename: Jialin
authors.initials: J
authors.lastname: Xu
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, China. Chengdp@zjut.edu.cn.
authors.forename: Dongping
authors.initials: D
authors.lastname: Cheng
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, China. lixingnuo@zjut.edu.cn.
authors.forename: Xingnuo
authors.initials: X
authors.lastname: Li
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, China. sqtong@zjut.edu.cn.
authors.forename: Shengqiang
authors.initials: S
authors.lastname: Tong
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, China. yjz@zjut.edu.cn.
authors.forename: Jizong
authors.initials: J
authors.lastname: Yan
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, China. liqy@zjut.edu.cn.
authors.forename: Qingyong
authors.initials: Q
authors.lastname: Li
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects; D002118:Calcium / Q000378:metabolism; D002166:Camptothecin / Q000031:analogs & derivatives / Q000494:pharmacology*; D002453:Cell Cycle / Q000187:drug effects; D002467:Cell Nucleus / Q000187:drug effects / Q000648:ultrastructure; D002470:Cell Survival / Q000187:drug effects; D053938:DNA Fragmentation / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D061986:MCF-7 Cells; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D008928:Mitochondria / Q000187:drug effects / Q000648:ultrastructure; D019772:Topotecan / Q000494:pharmacology
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D019772:Topotecan; D002118:Calcium; D002166:Camptothecin
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