title: [Inhibitory effect of Periplaneta Americana extract on 3LL lung cancer in mice].
abstract: BACKGROUND
  It has been known that Kangfuxin, a drug derived from Periplaneta Americana, can induce cell apoptosis of many cancer cell lines in vitro. The aim of this study is to investigate the inhibitory effect and mechanism of Periplaneta Americana extract (PAE) on 3LL lung cancer in mice.
  
  
  METHODS
  The C57BL/6J mice transplanted with 3LL lung cancer were divided into normal saline (NS), PAE high dose (PAE-H) and PAE low dose (PAE-L) groups. The body weight changes and inhibitory rate of tumor growth in each group were observed. In addition, the cell cycle, apoptosis index (AI) and the expression of apoptosis associated genes were analysed by flow cytometry (FCM).
  
  
  RESULTS
  The body weights were decreased in PAE-L and PAE-H treated group compared with NS group and the inhibitive rate of tumor growth was 41.24% and 81.08% respectively. FCM assay indicated that PAE could induce apoptosis of lung cancer cell, and the apoptosis rate was concentration-dependent. At the same time, the number of S and G2/M phase cells was decreased, most of the cells were arrested in G1/G1 phase. The result of TUNEL showed that there were apoptosis and necrosis associated with upregulated expression of Fas, FasR and p53 genes, and downregulated expression of Bcl-2.
  
  
  CONCLUSIONS
  PAE may inhibit the growth of 3LL lung cancer in mice and induce apoptosis of 3LL lung cancer cells. It might be related to its effects on the regulation of apoptotic gene expression.
authors.affiliation: Department of Tumor Institute, Yunnan Province Tumor Hospital, Kunming, Yunnan 650118, P.R.China.
authors.forename: Yongxin
authors.initials: Y
authors.lastname: Jiang
authors.forename: Xicai
authors.initials: X
authors.lastname: Wang
authors.forename: Congguo
authors.initials: C
authors.lastname: Jin
authors.forename: Xiaoqun
authors.initials: X
authors.lastname: Chen
authors.forename: Jia
authors.initials: J
authors.lastname: Li
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Wu
authors.forename: Guangming
authors.initials: G
authors.lastname: Liu
authors.forename: Shunan
authors.initials: S
authors.lastname: Li