Item request has been placed! ×
Item request cannot be made. ×
loading  Processing Request

Limited Antimycobacterial Efficacy of Epitope Peptide Administration Despite Enhanced Antigen-Specific CD4 T-Cell Activation.

Item request has been placed! ×
Item request cannot be made. ×
loading   Processing Request
  • معلومة اضافية
    • بيانات النشر:
      eScholarship, University of California, 2018.
    • الموضوع:
      2018
    • نبذة مختصرة :
      BackgroundInfection with Mycobacterium tuberculosis is associated with inconsistent and incomplete elimination of the bacteria, despite development of antigen-specific T-cell responses. One mechanism used by M tuberculosis is to limit availability of antigen for activation of CD4 T cells.MethodsWe examined the utility of systemic administration of epitope peptides to activate pre-existing T cells in mice infected with M tuberculosis.ResultsWe found that systemic peptide administration (1) selectively activates T cells specific for the epitope peptide, (2) loads major histocompatibility complex class II on lung macrophages and dendritic cells, (3) activates CD4 T cells in the lung parenchyma, (4) and has little antimycobacterial activity.ConclusionsFurther studies revealed that CD4 T cells in lung lesions are distant from the infected cells, suggesting that, even if they can be activated, the positioning of CD4 T cells and their direct interactions with infected cells may be limiting determinants of immunity in tuberculosis.
    • File Description:
      application/pdf
    • Rights:
      public
    • الرقم المعرف:
      edssch.oai:escholarship.org:ark:/13030/qt5nd940cx