Anti-stress proteins produced by Bacteroides thetaiotaomicron after nutrient starvation.
Bacteroides thetaiotaomicron maybe one of the most adaptable intestinal bacteria due to its complex genome. Known to be an opportunistic pathogenic anaerobe, B. thetaiotaomicron has recently been described as a symbiont with anti-inflammatory properties. In this study, peptide mass finger printing technique was used to identify the stress proteins (maybe anti-stress proteins for the host) extracted from B. thetaiotaomicron grown under nutrient starvation (without heme, blood or bile) prior to be placed in an aerobic solution containing a mild non-ionic detergent derived from cholic acid. We focus here on proteins related to stress, knowing that superoxide dismutase was previously identified in the extract. In parallel, the morphology of the bacterial cells was observed using electronic microscopy before and after the extraction process. The effective antioxidant effect of the extract was evaluated in vitro against hydrogen peroxide. This work highlights the B. thetaiotaomicron ability to produce a large amount of stress proteins and to remain viable during the extraction. Budding vesicles were observed on its cell wall. The extraction process did not exceed 20 h in order to preserve the bacterial viability that decreased significantly after 24 h in preliminary studies. In our experimental conditions, an inhibitory effect of the extract was found against hydrogen peroxide. Animal models of inflammation will later check in vivo if this extract of anti-stress proteins is able to counter the respiratory burst beginning an inflammation process.
Univ Lille Nord de France, F-59000 Lille, France; UDSL, EA 4481, UFR Pharmacie, F-59000 Lille, France; CHArmentières, F-59280, France; Faculté de Pharmacie, Laboratoire de Bactériologie, 3 rue du Pr Laguesse, BP 83, 59006 Lille Cedex, France. Electronic address: anne-cecile.hochart@univ-lille2.fr.
Anne-Cécile
AC
Hochart-Behra
Univ Lille Nord de France, F-59000 Lille, France; Peptide CSB Platform, IBL, 59000, Lille, France; Institut de Biologie de Lille, 1 rue du Pr Calmette, 59000 Lille, France. Electronic address: herve.drobecq@ibl.fr.
Hervé
H
Drobecq
Univ Lille Nord de France, F-59000 Lille, France; UDSL, EA 4481, UFR Pharmacie, F-59000 Lille, France; Faculté de Pharmacie, Laboratoire de Bactériologie, 3 rue du Pr Laguesse, BP 83, 59006 Lille Cedex, France. Electronic address: melissa.tourret@univ-lille2.fr.
Mélissa
M
Tourret
Univ Lille Nord de France, F-59000 Lille, France; UDSL, U995, 59000 Lille, France; Faculté de Pharmacie, Laboratoire de Bactériologie, 3 rue du Pr Laguesse, BP 83, 59006 Lille Cedex, France. Electronic address: luc.dubreuil@univ-lille2.fr.
Luc
L
Dubreuil
Univ Lille Nord de France, F-59000 Lille, France; UDSL, EA 4481, UFR Pharmacie, F-59000 Lille, France; Faculté de Pharmacie, Laboratoire de Bactériologie, 3 rue du Pr Laguesse, BP 83, 59006 Lille Cedex, France. Electronic address: josette.behra@univ-lille2.fr.
Josette
J
Behra-Miellet
D000975:Antioxidants / Q000032:analysis; D001426:Bacterial Proteins / Q000032:analysis*; D001439:Bacteroides / Q000737:chemistry* / Q000502:physiology* / Q000648:ultrastructure; D055354:Exosomes; D006360:Heat-Shock Proteins / Q000032:analysis*; D006861:Hydrogen Peroxide / Q000633:toxicity; D050296:Microbial Viability; D008854:Microscopy, Electron; D010449:Peptide Mapping; D013312:Stress, Physiological
D000975:Antioxidants; D001426:Bacterial Proteins; D006360:Heat-Shock Proteins; D006861:Hydrogen Peroxide
Antioxidant; Bacteroides thetaiotaomicron; Chaperones; Obligate anaerobe; Oxidative stress; Vesicles