title: Investigation into in vitro and in vivo models using intestinal epithelial IPEC-J2 cells and Caenorhabditis elegans for selecting probiotic candidates to control porcine enterotoxigenic Escherichia coli.
abstract: OBJECTIVE
  To identify a fast, economic and reliable method for preselecting lactic acid-producing bacterial (LAB) isolates to control enterotoxigenic Escherichia coli (ETEC).
  
  
  RESULTS
  Two assays with porcine intestinal epithelial IPEC-J2 cells or Caenorhabditis elegans for selecting effective probiotic candidates were compared. Both assays were based on measuring death of cells or worms caused by ETEC strain JG280. Six of 13 LAB isolates showed ≥50% protection in each assay, among which only four isolates (≥50% protection) were consistently selected by both assays. Isolate CL9 (Lactobacillus reuteri) was further studied. It reduced gene expression of estA, estB and elt in JG280 in both assays. Furthermore, the isolate protected IPEC-J2 and C. elegans from cell and worm death caused by STa, STb or LT enterotoxin expressed in E. coli DH5α. CL9 also promoted host defensive responses by decreasing IL-8 and increasing IL-10 production in IPEC-J2 cells and expression of antimicrobial peptide genes clec-60, clec-85 in C. elegans.
  
  
  CONCLUSIONS
  Caenorhabditis elegans is useful for preselecting probiotic candidates to control ETEC after initial screening with IPEC-J2 cells.
  
  
  CONCLUSIONS
  A combination of IPEC-J2 cell and C. elegans assays can improve the effectiveness in preselecting probiotic candidates.
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China; Guelph Food Research Centre, Agriculture and Agri-Food Canada, Guelph, ON, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Zhou
authors.forename: J
authors.initials: J
authors.lastname: Zhu
authors.forename: H
authors.initials: H
authors.lastname: Yu
authors.forename: X
authors.initials: X
authors.lastname: Yin
authors.forename: P M
authors.initials: PM
authors.lastname: Sabour
authors.forename: L
authors.initials: L
authors.lastname: Zhao
authors.forename: W
authors.initials: W
authors.lastname: Chen
authors.forename: J
authors.initials: J
authors.lastname: Gong
mesh_terms: D000818:Animals; D000898:Antibiosis; D023181:Antimicrobial Cationic Peptides / Q000819:agonists / Q000096:biosynthesis; D017173:Caenorhabditis elegans / Q000187:drug effects* / Q000382:microbiology; D002460:Cell Line; D054307:Enterotoxigenic Escherichia coli / Q000187:drug effects* / Q000254:growth & development; D004768:Enterotoxins / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D004847:Epithelial Cells / Q000187:drug effects* / Q000382:microbiology; D004927:Escherichia coli Infections / Q000178:diet therapy / Q000382:microbiology / Q000662:veterinary; D016753:Interleukin-10 / Q000819:agonists / Q000378:metabolism; D016209:Interleukin-8 / Q000037:antagonists & inhibitors / Q000378:metabolism; D007422:Intestines / Q000187:drug effects / Q000382:microbiology; D052200:Limosilactobacillus reuteri / Q000502:physiology*; D008954:Models, Biological; D019936:Probiotics / Q000494:pharmacology*; D013552:Swine; D013553:Swine Diseases / Q000178:diet therapy / Q000382:microbiology
chemical_list: D023181:Antimicrobial Cationic Peptides; D004768:Enterotoxins; D016209:Interleukin-8; D016753:Interleukin-10
keywords: Caenorhabditis elegans; Escherichia coli; IPEC-J2; lactic acid-producing bacteria; models for selection