Cell Reports (May 2018)

STING-Activating Adjuvants Elicit a Th17 Immune Response and Protect against Mycobacterium tuberculosis Infection

  • Erik Van Dis,
  • Kimberly M. Sogi,
  • Chris S. Rae,
  • Kelsey E. Sivick,
  • Natalie H. Surh,
  • Meredith L. Leong,
  • David B. Kanne,
  • Ken Metchette,
  • Justin J. Leong,
  • Jacob R. Bruml,
  • Vivian Chen,
  • Kartoosh Heydari,
  • Nathalie Cadieux,
  • Tom Evans,
  • Sarah M. McWhirter,
  • Thomas W. Dubensky, Jr.,
  • Daniel A. Portnoy,
  • Sarah A. Stanley

Journal volume & issue
Vol. 23, no. 5
pp. 1435 – 1447

Abstract

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Summary: There are a limited number of adjuvants that elicit effective cell-based immunity required for protection against intracellular bacterial pathogens. Here, we report that STING-activating cyclic dinucleotides (CDNs) formulated in a protein subunit vaccine elicit long-lasting protective immunity to Mycobacterium tuberculosis in the mouse model. Subcutaneous administration of this vaccine provides equivalent protection to that of the live attenuated vaccine strain Bacille Calmette-Guérin (BCG). Protection is STING dependent but type I IFN independent and correlates with an increased frequency of a recently described subset of CXCR3-expressing T cells that localize to the lung parenchyma. Intranasal delivery results in superior protection compared with BCG, significantly boosts BCG-based immunity, and elicits both Th1 and Th17 immune responses, the latter of which correlates with enhanced protection. Thus, a CDN-adjuvanted protein subunit vaccine has the capability of eliciting a multi-faceted immune response that results in protection from infection by an intracellular pathogen. : Van Dis et al. demonstrate that STING-activating cyclic dinucleotides provide significant protection when used as adjuvants in a protein subunit vaccine against Mycobacterium tuberculosis and show that mucosal administration of this vaccine elicits a Th17 immune response that correlates with enhanced protection. Keywords: Mycobacterium tuberculosis, vaccine adjuvant, cyclic dinucleotides, Th17