Mycobacterial para-Hydroxybenzoic Acid-Derivatives (p HBADs) and Related Structures Induce Macrophage Innate Memory

ACS Chem Biol. 2020 Sep 18;15(9):2415-2421. doi: 10.1021/acschembio.0c00378. Epub 2020 Aug 21.

Abstract

Macrophages are key immune cells for combatting Mycobacterium tuberculosis. However, M. tuberculosis possesses means to evade macrophage bactericidal responses by, for instance, secretion of the immunomodulatory para-hydroxybenzoic acid derivatives (pHBADs). While these molecules have been implicated in inhibiting macrophage responses in an acute context, little is known about their ability to reprogram macrophages via induction of long-term innate memory. Since innate memory has been highlighted as a promising strategy to augment bactericidal immune responses against M. tuberculosis, investigating corresponding immune evasion mechanisms is highly relevant. Our results reveal for the first time that pHBAD I and related molecules (unmethylated pHBAD I and the hexose l-rhamnose) reduce macrophage bactericidal mechanisms in both the short- and the long-term. Moreover, we demonstrate how methyl-p-anisate hinders bactericidal responses soon after exposure yet results in enhanced pro-inflammatory responses in the long-term. This work highlights new roles for these compounds in M. tuberculosis pathogenesis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Benzoates / pharmacology
  • Immunity, Innate / drug effects*
  • Immunologic Factors / pharmacology*
  • Interleukin-10 / metabolism
  • Macrophage Activation / drug effects*
  • Macrophages / drug effects*
  • Mice
  • Nitric Oxide / metabolism
  • Nitric Oxide Synthase Type II / metabolism
  • Parabens / pharmacology*
  • Rhamnose / pharmacology
  • Tumor Necrosis Factor-alpha / metabolism

Substances

  • Benzoates
  • IL10 protein, mouse
  • Immunologic Factors
  • Parabens
  • Tumor Necrosis Factor-alpha
  • Interleukin-10
  • methyl 4-anisate
  • Nitric Oxide
  • Nitric Oxide Synthase Type II
  • Nos2 protein, mouse
  • Rhamnose