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Journal of Immunology Research
Volume 2015, Article ID 385402, 12 pages
http://dx.doi.org/10.1155/2015/385402
Research Article

Vaccination with an Attenuated Ferritin Mutant Protects Mice against Virulent Mycobacterium tuberculosis

1Laboratory of Mycobacterial Immunity and Pathogenesis, Rutgers, The State University of New Jersey, 225 Warren Street, Newark, NJ 07103, USA
2Public Health Research Institute at Rutgers Biomedical and Health Sciences, Rutgers, The State University of New Jersey, 225 Warren Street, Newark, NJ 07103, USA

Received 31 July 2014; Accepted 17 September 2014

Academic Editor: Vishwanath Venketaraman

Copyright © 2015 Selvakumar Subbian et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Mycobacterium tuberculosis the causative agent of tuberculosis affects millions of people worldwide. New tools for treatment and prevention of tuberculosis are urgently needed. We previously showed that a ferritin (bfrB) mutant of M. tuberculosis has altered iron homeostasis and increased sensitivity to antibiotics and to microbicidal effectors produced by activated macrophages. Most importantly, M. tuberculosis lacking BfrB is strongly attenuated in mice, especially, during the chronic phase of infection. In this study, we examined whether immunization with a bfrB mutant could confer protection against subsequent infection with virulent M. tuberculosis in a mouse model. The results show that the protection elicited by immunization with the bfrB mutant is comparable to BCG vaccination with respect to reduction of bacterial burden. However, significant distinctions in the disease pathology and host genome-wide lung transcriptome suggest improved containment of Mtb infection in animals vaccinated with the bfrB mutant, compared to BCG. We found that downmodulation of inflammatory response and enhanced fibrosis, compared to BCG vaccination, is associated with the protective response elicited by the bfrB mutant.