Vaccine-driven lung TRM cells provide immunity against Klebsiella via fibroblast IL-17R signaling

Sci Immunol. 2021 Sep 10;6(63):eabf1198. doi: 10.1126/sciimmunol.abf1198. Epub 2021 Sep 10.

Abstract

Tissue-resident memory (TRM) cells are thought to play a role in lung mucosal immunity to pathogens, but strategies to elicit TRM by mucosal vaccines have not yet been fully realized. Here, we formulated a vaccine composed of outer membrane protein (Omp) X from Klebsiella pneumoniae and LTA1 adjuvant that was administered by the intrapulmonary route. This vaccine elicited both TH1 and TH17 cells that shared transcriptional features with cells elicited by heat-killed K. pneumoniae. Antibody responses were required to prevent bacterial dissemination but dispensable for lung-specific immunity. In contrast, lung immunity required CD4+ T cells, STAT3 expression, and IL-17R signaling in fibroblasts. Lung-specific CD4+ T cells from OmpX+LTA1–immunized mice were observed homing to the lung and could mediate protection against infection in an adoptive transfer model. Vaccine-elicited TH17 cells showed reduced plasticity and were resistant to the immunosuppressant FK506 compared with TH1 cells, and TH17 cells conferred protection under conditions of transplant immunosuppression. These data demonstrate a promising vaccine strategy that elicits lung TRM cells and promotes serotype-independent immunity to K. pneumoniae.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • CD4-Positive T-Lymphocytes / immunology*
  • Fibroblasts / immunology
  • Immunity, Mucosal / immunology
  • Immunologic Memory / immunology*
  • Klebsiella pneumoniae / immunology*
  • Lung / immunology*
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Receptors, Interleukin-17 / immunology*
  • Signal Transduction / immunology
  • Vaccines / immunology*

Substances

  • Receptors, Interleukin-17
  • Vaccines