Investigational New Drugs

, Volume 26, Issue 6, pp 517–524 | Cite as

CPT21, a novel compound with anti-proliferative effect against gastric cancer cell SGC7901

  • Bo Zhang
  • Yu Luo
  • Qinjie Weng
  • Qiaojun HeEmail author
  • Wei LuEmail author
  • Bo YangEmail author


7-[(3-piperidyl)-1-propinyl]-camptothecin (CPT21) is a novel semi-synthetic water-soluble analogue of camptothecin. In this context, we assessed the anti-tumor activity of CPT21 both in vivo and in vitro and explored its molecular mechanism. We found that CPT21 presented a broad anti-tumor spectrum against ten cancer cell lines in vitro, and the IC50 values ranged from 0.1 to 12.0 μM. CPT21 was also capable to interrupt the DNA topoisemerase I activity and caused DNA double strand breaks during DNA replication. Proportion of apoptotic SGC7901 cells induced by CPT21 showed a time- and concentration-dependent increase accompanied with the decrease in mitochondria membrane potential (ΔΨm). We also observed that CPT21 up-regulated the protein expression of p53, phospho-p53, p21, BAX, phospho-c-Jun NH2-terminal protein kinase (JNK), meanwhile down-regulating the protein expression of Bcl-2, procaspase-9, XIAP, and phospho-ERK1/2. In the study of SGC7901 xenograft model, the results suggested that both 5.0 mg/kg and 10.0 mg/kg CPT21 achieved high anti-tumor activity, and the tumor inhibition rates were 42.5% and 75.1% respectively. Taken together, our study demonstrates that CPT21 displays an extensive anti-tumor spectrum and CPT21 can induce the apoptosis of SGC7901 cells via activating the caspases cascade followed by disrupting mitochondrion function.


Camptothecin Gastric cancer Apoptosis Xenograft 



This study receives financial support from Health Bureau of Zhejiang Province Foundation (No.WKJ2006-2-015) and is sponsored by Zhejiang Provincial Program for the Cultivation of High-level Innovative Health talents.


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© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.College of Pharmaceutical SciencesZhejiang UniversityHangzhouChina
  2. 2.Institute of Medicinal Chemistry, Department of ChemistryEast China Normal UniversityShanghaiChina

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