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Proteomic Analysis of Membrane Blebs of 2308 and RB51 and Their Evaluation as an Acellular Vaccine. | LitMetric

AI Article Synopsis

Article Abstract

Membrane blebs are released from Gram-negative bacteria, however, little is known about blebs. This work pursued two objectives, the first was to determine and identify the proteins in the membrane blebs by proteomics and analysis. The second aim was to evaluate the use of membrane blebs of 2308 and RB51 as an acellular vaccine and . To achieve these aims, membrane blebs from 2308 and RB51 were obtained and then analyzed by liquid chromatography coupled to mass spectrometry. membrane blebs were used as a "vaccine" to induce an immune response in BALB/c mice, using the strain RB51 as a positive vaccine control. After subsequent challenge with 2308, CFUs in spleens were determined; and immunoglobulins IgG1 and IgG2a were measured in murine serum by ELISA. Also, activation and costimulatory molecules induced by membrane blebs were analyzed in splenocytes by flow cytometry. Two hundred and twenty eight proteins were identified in 2308 membrane blebs and 171 in RB51 blebs, some of them are well-known immunogens such as SodC, Omp2b, Omp2a, Omp10, Omp16, and Omp19. Mice immunized with membrane blebs from rough or smooth induced similar protective immune responses as well as the vaccine RB51 after the challenge with virulent strain 2308 ( < 0.05). The levels of IgG2a in mice vaccinated with 2308 membrane blebs were higher than those vaccinated with RB51 membrane blebs or RB51 post-boosting. Moreover, mice immunized with 2308 blebs increased the percentage of activated B cells (CD19CD69) Therefore, membrane blebs are potential candidates for the development of an acellular vaccine against brucellosis, especially those derived from the rough strains so that serological diagnostic is not affected.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6895012PMC
http://dx.doi.org/10.3389/fmicb.2019.02714DOI Listing

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