title: Induction of Yersinia enterocolitica stress proteins by phagocytosis with macrophage.
abstract: Yersinia enterocolitica is a facultative intracellular pathogen which invades to epithelial cells and survives in phagocytes. Since the internal environment of phagocytes should be stressful conditions for the phagocytosed Yersinia, the bacteria should respond to protect themselves from otherwise lethal results. We analyzed the stress-induced proteins which possibly contribute to survival of Yersinia within the phagocytes. Y. enterocolitica was radiolabeled during the growth in macrophage-like J774-1 cells, and the bacterial proteins were analyzed by two-dimensional gel electrophoresis. At least 16 proteins were selectively induced in response to phagocytosis, and several out of 16 proteins were also induced by heat shock at 42 C or oxidative stresses in vitro. Of those, two major stress proteins were identified to be homologues of DnaK and CRPA by immunoblotting analysis. These results have indicated that Y. enterocolitica exhibits a global stress response to the hostile environment in the phagocytosed macrophage.
authors.affiliation: Department of Microbiology, Kyorin University School of Medicine, Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yamamoto
authors.forename: T
authors.initials: T
authors.lastname: Hanawa
authors.forename: S
authors.initials: S
authors.lastname: Ogata
mesh_terms: D000818:Animals; D001426:Bacterial Proteins / Q000096:biosynthesis; D002460:Cell Line; D015180:Electrophoresis, Gel, Two-Dimensional; D029968:Escherichia coli Proteins; D018840:HSP70 Heat-Shock Proteins; D006360:Heat-Shock Proteins / Q000032:analysis / Q000096:biosynthesis*; D006358:Hot Temperature; D006861:Hydrogen Peroxide / Q000494:pharmacology; D008264:Macrophages / Q000276:immunology / Q000382:microbiology*; D051379:Mice; D010587:Phagocytosis; D015008:Yersinia enterocolitica / Q000187:drug effects / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D018840:HSP70 Heat-Shock Proteins; D006360:Heat-Shock Proteins; D006861:Hydrogen Peroxide; C063842:dnaK protein, E coli