title: Chemopreventive effects of berberine on intestinal tumor development in Apcmin/+ mice.
abstract: BACKGROUND
  Berberine, an isoquinoline alkaloid, has shown inhibitory effects on growth of several tumor cell lines in vitro. The aim of this study was to investigate chemopreventive effects of berberine on intestinal tumor development in Apcmin/+ mice.
  
  
  METHODS
  Four-week old Apcmin/+ mice were treated with 0.05% or 0.1% berberine in drinking water for twelve weeks. The number and the size of tumors were measured to evaluate intestinal tumor development. Tissue sections were prepared for PCNA and Ki-67 immunostaining to detect cell proliferation, and TUNEL assay and cleaved caspase-3 immunostaining for apoptosis. Western blot analysis and immunostaining were performed to detect the activation of Wnt and epidermal growth factor receptor (EGFR) signaling pathways and COX-2 expression in the intestinal tumor cells. The prostaglandin E2 level in the small intestine was detected using ELISA.
  
  
  RESULTS
  Compared with untreated Apcmin/+ mice, the total numbers of tumors in the small intestine and the colon were reduced by 39.6% and 62.5% in 0.05% and 0.1% berberine-treated mice, respectively. The numbers of tumors in proximal, middle, and distal segments of the small intestine in 0.1% berberine-treated mice were significantly reduced by 53.7%, 55.3%, and 76.5% respectively. Berberine treatment also decreased the numbers of all sizes of tumors (>2 mm, 1-2 mm, and <1 mm) in the small intestine. Berberine suppressed tumor cell proliferation and increased apoptosis. Furthermore, berberine decreased the activation levels of Wnt and EGFR signaling pathways, and down-regulated COX-2 expression in intestinal tumor cells and prostaglandin E2 production in the small intestine.
  
  
  CONCLUSIONS
  Berberine inhibits intestinal tumor development, which is correlated with its activity to suppress tumor cell proliferation and increase apoptosis in Apcmin/+ mice. Down-regulation of Wnt and EGFR signaling pathways and COX-2 expression by berberine may be involved in its anti-tumorigenic effects.
authors.affiliation: Department of Gastroenterology and Hepatology, General Hospital, Tianjin Medical University, 154 Anshan Road in Heping District, Tianjin 300052, China. gi.tmuh@yeah.net.
authors.forename: Hailong
authors.initials: H
authors.lastname: Cao
authors.forename: Shuli
authors.initials: S
authors.lastname: Song
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.forename: Yujie
authors.initials: Y
authors.lastname: Zhang
authors.forename: Rui
authors.initials: R
authors.lastname: Qu
authors.forename: Boli
authors.initials: B
authors.lastname: Yang
authors.forename: Yang
authors.initials: Y
authors.lastname: Jing
authors.forename: Tianhui
authors.initials: T
authors.lastname: Hu
authors.forename: Fang
authors.initials: F
authors.lastname: Yan
authors.forename: Bangmao
authors.initials: B
authors.lastname: Wang
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D001599:Berberine / Q000494:pharmacology*; D049109:Cell Proliferation / Q000187:drug effects; D003106:Colon / Q000187:drug effects*; D051546:Cyclooxygenase 2 / Q000187:drug effects; D015536:Down-Regulation; D066246:ErbB Receptors / Q000187:drug effects; D017491:Genes, APC; D007414:Intestinal Neoplasms / Q000517:prevention & control*; D007421:Intestine, Small / Q000187:drug effects*; D051379:Mice; D008822:Mice, Transgenic; D015398:Signal Transduction / Q000187:drug effects; D060449:Wnt Signaling Pathway / Q000187:drug effects
chemical_list: D001599:Berberine; C077623:Ptgs2 protein, mouse; D051546:Cyclooxygenase 2; C541485:EGFR protein, mouse; D066246:ErbB Receptors