A Brucella melitensis M5-90 wboA deletion strain is attenuated and enhances vaccine efficacy

作者：Li, Zhi-Qiang; Shi, Jingx-Xue; Fu, Wen-Dong; Zhang, Yu; Zhang, Jing; Wang, Zhen; Li, Tian-Sen; Chen, Chuang-Fu; Guo, Fei; Zhang, Hui

来源：Molecular Immunology, 2015, 66(2): 276-283.

DOI：10.1016/j.molimm.2015.04.004

• B. melitensis M5-90
• Live attenuated
• Vaccine candidate
• wboA

Brucella spp. are Gram-negative intracellular pathogens of both humans and animals that cause great economic burdens in developing countries. Live attenuated vaccines are the most efficient means for the prevention and control of animal Brucellosis. However, Brucella vaccines (strain M5-90 and others) have several drawbacks and do not allow serological differentiation between vaccinated and infected animals. A wboA mutant was derived from Brucella melitensis (B. melitensis) vaccine strain M5-90 and tested for virulence and protective efficiency. T-cell responses (CD4(+), CD8(+)), levels of immunoglobulin G (IgG), and cytokine production were observed. WboA was also assessed as a diagnostic marker for Brucellosis. B. melitensis strain M5-90 Delta wboA exhibited reduced survival in murine macrophages (RAW 264.7) and BALB/c mice and induced protective immunity in mice comparable to that from the parental strain M5-90. In mice, the wboA mutant elicited an anti-Brucella-specific IgG response and induced the secretion of gamma interferon (IFN-gamma) and interleukin-2 (IL-2). In sheep, M5-90 Delta wboA immunization induced the secretion of IFN-gamma, and serum samples from sheep inoculated with M5-90 Delta wboA were negative by Bengal Plate Test (RBPT) and Standard Tube Agglutination Test (STAT). In mice, probes against WboA antigen allowed for serological differentiation between natural infection and vaccination. The M5-90 Delta wboA mutant is a potential attenuated live vaccine candidate against virulent B. melitensis 16M infection. It will be further evaluated in livestock.

• 出版日期2015-8
• 单位石河子大学