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Sökning: WFRF:(Bayrak Burcu)

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1.
  • Mukherjee, Oindrilla, et al. (författare)
  • A fusion protein derived from Moraxella catarrhalis and Neisseria meningitidis aimed for immune modulation of human B cells
  • 2015
  • Ingår i: Human Vaccines & Immunotherapeutics. - : Informa UK Limited. - 2164-5515 .- 2164-554X. ; 11:9, s. 2223-2227
  • Tidskriftsartikel (refereegranskat)abstract
    • Moraxella IgD-binding protein (MID) is a well characterized trimeric autotransporter that specifically targets the IgD of B cells. We fused the membrane anchor of the meningococcal autotransporter NhhA with the IgD-binding region of MID (aa 962-1200) to create a chimeric protein designated as NID. The aim was to use this specific targeting to provide a better vaccine candidate against meningococci, in particular serogroup B by enhancing the immunogenicity of NhhA. NID was thereafter recombinantly expressed in E. coli. The NID-expressing E. coli bound to peripheral B lymphocytes that resulted in cellular activation. Furthermore, we also successfully expressed NID on outer membrane vesicles, nanoparticles that are commonly used in meningococcal vaccines. This study thus highlights the applicability of the menigococcal-Moraxella fusion protein NID to be used for specific targeting of vaccine components to the IgD B cell receptor.
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2.
  • Singh, Kalpana, et al. (författare)
  • A Role for TLRs in Moraxella-superantigen induced polyclonal B cell activation.
  • 2012
  • Ingår i: Frontiers in bioscience (Scholar edition). - 1945-0524. ; 4, s. 1031-1043
  • Tidskriftsartikel (refereegranskat)abstract
    • A number of microorganisms are capable of binding immunoglobulins (Igs) in a manner, which excludes binding to conventional antigen binding sites. Interaction of such bacterial proteins with surface immunoglobulins leads to polyclonal activation of B-lymphocytes. A recent example is Moraxella catarrhalis that binds to B lymphocytes in an IgD-dependent manner and induces proliferation and differentiation of B lymphocytes leading to the production of unspecific Igs. The activation is mediated by Moraxella IgD binding protein (MID), which specifically binds to both soluble IgD and the IgD B cell receptor (BCR). Besides cross-linking the BCR, whole Moraxella and outer membrane vesicles (OMVs) engage Toll like receptors (TLRs) to further increase the response. TLR activation leads to initiation of signaling pathways, which evoke a proinflammatory response against the invading microbes. Polyclonal B cell activation has in general been implicated in various phenomenons that are detrimental for the host but beneficial for pathogens, for example, autoimmune manifestations and redirection of the immune system.
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