期刊
FRONTIERS IN IMMUNOLOGY
卷 10, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fimmu.2019.01385
关键词
Group A Streptococcus; NADase; P2X7; IL-beta; membrane permeabilization
类别
资金
- Swedish Research Council
- Swedish Foundation for Strategic Research
- Emil and Wera Cornell Foundation
- Crafoord Foundation
- Royal Physiographic Society of Lund
- Gyllenstierna Krapperup's Foundation
- Swedish Society of Medicine
- foundation of Anna and Edwin Berger
- foundation of Magnus Bergvall
- foundation of Golje-Lundstrom
- foundation of Jeansson
- foundation of Kock
- foundation of Lars Hiertas Minne
- foundation of Carl Trygger
- foundation of Tore Nilsson
- foundation of Thelma Zoega
- foundation of Alfred Osterlund
- HRH Crown Princess Lovisa's Pediatrics Association
The common human pathogen Group A Streptococcus (GAS) causes superficial as well as invasive, life-threatening diseases. An increase in the occurrence of invasive GAS infection by strains of the M1 and M89 serotypes has been correlated with increased expression of the genetically and functionally linked virulence factors streptolysin O (SLO) and beta-NAD(+)-glycohydrolase (NADase). NADase affects host cells differently depending on its location: its SLO-dependent translocation into the cytosol can lead to cell death through beta-NAD(+) depletion, while extracellularly located NADase inhibits IL-1 beta release downstream of Nlrp3 inflammasome activation. In this study, we use a macrophage infection model to investigate the NADase-dependent inhibition of IL-1 beta release. We show that bacteria expressing a functional NADase evade P2X7 activation, while infection with a NADase-deficient GAS strain leads to a P2X7-mediated increase in IL-1 beta. Further, our data indicate that in the absence of NADase, IL-1 beta is released through both P2X7-dependent and -independent pathways, although the precise mechanisms of how this occur are still unclear. This study adds information about the mechanism by which NADase regulates inflammasome-dependent IL-1 beta release, which may in part explain why increased NADase expression correlates with bacterial virulence.
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