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© Research
Publication : Behring Institute Mitteilungen

Expression and immune response to foreign epitopes in bacteria. Perspectives for live vaccine development

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Behring Institute Mitteilungen - 01 Feb 1997

Charbit A, Newton SM, Klebba PE, Clément JM, Fayolle C, Lo-Man R, Leclerc C, Hofnung M

Link to Pubmed [PMID] – 9382734

Behring Inst. Mitt. 1997 Feb;(98):135-42

We previously developed a general procedure which allows the genetic coupling of a chosen foreign linear epitope in different regions of a carrier protein. By using as carriers, two bacterial envelope proteins, the LamB and MalE proteins of E. coli K12, we were able to express the same epitope in different sites of the two proteins and in different compartments of the bacteria. This allowed us to analyze the influence of the localization in E. coli cells of a foreign B-cell epitope on the induction of specific antibody responses, and the role of the molecular environment on the immunological properties of foreign B- or T-cell epitopes, using either purified hybrid proteins or live recombinant bacteria. Several LamB and MalE hybrid proteins were expressed in the aroA attenuated strain of S. typhimurium, SL3261. Immunizations of mice with live recombinant bacteria by the intravenous route showed that it was possible to induce humoral responses against inserted foreign sequences. In order to improve the in vivo stability of the plasmids carrying the different contructions, and to increase the amounts of recombinant LamB and MalE hybrid proteins expressed in vivo, the LamB and malE genes were placed under the control of the anaerobically inducible pnirBpromoter control. The genetic factors susceptible of influencing the immune response to recombinant Salmonella in mice were also studied.

http://www.ncbi.nlm.nih.gov/pubmed/9382734