title: Recombinant BCG ΔureC hly+ induces superior protection over parental BCG by stimulating a balanced combination of type 1 and type 17 cytokine responses.
abstract: BACKGROUND
  New vaccines against tuberculosis (TB) are urgently needed because the only available vaccine, Mycobacterium bovis bacillus Calmette-Guérin (BCG), fails to protect against pulmonary TB in adults. The recombinant ΔureC hly+ BCG (rBCG) is more efficient than parental BCG (pBCG) against pulmonary TB in preclinical studies and has proven safe and immunogenic in phase I clinical trials.
  
  
  METHODS
  In an attempt to identify the mechanisms underlying the superior protection of rBCG, we compared the immune responses elicited after vaccination and subsequent aerosol infection with Mycobacterium tuberculosis (MTB) in mice.
  
  
  RESULTS
  We demonstrate that both rBCG and pBCG induce marked type 1 cytokine responses, whereas only rBCG elicits a profound type 17 cytokine response in addition. We observed earlier recruitment of antigen-specific T lymphocytes to the lung upon MTB infection of rBCG-vaccinated mice. These T cells produced abundant type 1 cytokines after restimulation, resulting in 10-fold reduced bacterial burden 90 days after infection.
  
  
  CONCLUSIONS
  Our findings identify a general immunologic pathway for improved vaccination strategies against TB that can also be harnessed by other vaccine candidates.
authors.affiliation: Department of Immunology, Max Planck Institute for Infection Biology, Berlin. kaufmann@mpiib-berlin.mpg.de
authors.forename: Christiane
authors.initials: C
authors.lastname: Desel
authors.forename: Anca
authors.initials: A
authors.lastname: Dorhoi
authors.forename: Silke
authors.initials: S
authors.lastname: Bandermann
authors.forename: Leander
authors.initials: L
authors.lastname: Grode
authors.forename: Bernd
authors.initials: B
authors.lastname: Eisele
authors.forename: Stefan H E
authors.initials: SH
authors.lastname: Kaufmann
mesh_terms: D000818:Animals; D001500:BCG Vaccine / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000378:metabolism*; D016207:Cytokines / Q000378:metabolism*; D005260:Female; D020381:Interleukin-17 / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D009169:Mycobacterium tuberculosis / Q000276:immunology*; D014376:Tuberculosis / Q000276:immunology* / Q000517:prevention & control; D014614:Vaccines, Synthetic / Q000276:immunology
chemical_list: D001500:BCG Vaccine; D016207:Cytokines; D020381:Interleukin-17; D014614:Vaccines, Synthetic