Acquisition of pneumococci specific effector and regulatory Cd4+ T cells localising within human upper respiratory-tract mucosal lymphoid tissue

Jeffrey Pido-Lopez, William W Kwok, Timothy J Mitchell, Robert S Heyderman, Neil A Williams

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

The upper respiratory tract mucosa is the location for commensal Streptococcus (S.) pneumoniae colonization and therefore represents a major site of contact between host and bacteria. The CD4(+) T cell response to pneumococcus is increasingly recognised as an important mediator of immunity that protects against invasive disease, with data suggesting a critical role for Th17 cells in mucosal clearance. By assessing CD4 T cell proliferative responses we demonstrate age-related sequestration of Th1 and Th17 CD4(+) T cells reactive to pneumococcal protein antigens within mucosal lymphoid tissue. CD25(hi) T cell depletion and utilisation of pneumococcal specific MHCII tetramers revealed the presence of antigen specific Tregs that utilised CTLA-4 and PDL-1 surface molecules to suppress these responses. The balance between mucosal effector and regulatory CD4(+) T cell immunity is likely to be critical to pneumococcal commensalism and the prevention of unwanted pathology associated with carriage. However, if dysregulated, such responses may render the host more susceptible to invasive pneumococcal infection and adversely affect the successful implementation of both polysaccharide-conjugate and novel protein-based pneumococcal vaccines.

Original languageEnglish
Pages (from-to)e1002396
JournalPLoS pathogens
Volume7
Issue number12
DOIs
Publication statusPublished - Dec 2011

Keywords

  • Adolescent
  • Adult
  • Aging
  • Child
  • Child, Preschool
  • Female
  • Humans
  • Immunity, Cellular
  • Male
  • Pneumococcal Infections
  • Pneumococcal Vaccines
  • Respiratory Mucosa
  • Streptococcus pneumoniae
  • T-Lymphocytes, Regulatory
  • Th1 Cells
  • Th17 Cells

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