title: Inhibition of Helicobacter pylori-induced inflammation in human gastric epithelial AGS cells by Phyllanthus urinaria extracts.
abstract: OBJECTIVE
  Helicobacter pylori is linked to a majority of peptic ulcers and to some types of gastric cancer, and its resistance to antibiotic treatment is now found worldwide. This study is aimed at evaluating the antimicrobial activity of Phyllanthus urinaria Linnea (Euphorbiaceae), chloroform (PUC) and methanol (PUM) extracts, and its eight isolates on H. pylori-infected human gastric epithelial AGS cells.
  
  
  METHODS
  The in vitro anti-bacterial activity of P. urinaria chloroform (PUC) and methanol (PUM) extracts, and its eight isolates were determined. Additional experiments were also performed to know the PUC and PUM ability to inhibit the H. pylori adhesion to and invasion of AGS cells, in addition to the effect of PUC on NF-kappaB activity as well as IL-8 synthesis during H. pylori infection of AGS cells.
  
  
  RESULTS
  The results revealed that crude extracts PUC and PUM showed potent antimicrobial activity against H. pylori than pure isolates. On the other hand, in vitroH. pylori-infection model revealed that the inhibition of bacterial adhesion and invasion to AGS cells has dramatically reduced by treatment of extract PUC, while PUM has the same moderate effect. Furthermore, H. pylori-induced nuclear factor (NF)-kappaB activation, and the subsequent release of interleukin (IL)-8 in AGS cells were also inhibited by the extract PUC.
  
  
  CONCLUSIONS
  These results open the possibility of considering P. urinaria a chemopreventive agent for peptic ulcer or gastric cancer, but this bioactivity should be confirmed in vivo in the future.
authors.affiliation: Department of Microbiology, School of Medicine, China Medical University, Taichung, Taiwan, ROC.
authors.forename: Chih-Ho
authors.initials: CH
authors.lastname: Lai
authors.forename: Shih-Hua
authors.initials: SH
authors.lastname: Fang
authors.forename: Yerra Koteswara
authors.initials: YK
authors.lastname: Rao
authors.forename: Madamanchi
authors.initials: M
authors.lastname: Geethangili
authors.forename: Chih-Hsin
authors.initials: CH
authors.lastname: Tang
authors.forename: Ying-Ju
authors.initials: YJ
authors.lastname: Lin
authors.forename: Chien-Hui
authors.initials: CH
authors.lastname: Hung
authors.forename: Wen-Ching
authors.initials: WC
authors.lastname: Wang
authors.forename: Yew-Min
authors.initials: YM
authors.lastname: Tzeng
mesh_terms: D001422:Bacterial Adhesion / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D004847:Epithelial Cells / Q000187:drug effects; D005753:Gastric Mucosa / Q000166:cytology / Q000187:drug effects*; D005756:Gastritis / Q000517:prevention & control*; D016480:Helicobacter pylori / Q000187:drug effects*; D006801:Humans; D029803:Phyllanthus; D008517:Phytotherapy; D010936:Plant Extracts / Q000494:pharmacology*
chemical_list: D010936:Plant Extracts