TY - JOUR
T1 - NLRP3 and ASC differentially affect the lung transcriptome during pneumococcal pneumonia
AU - van Lieshout, Miriam H.
AU - Scicluna, Brendon P.
AU - Florquin, Sandrine
AU - van der Poll, Tom
PY - 2014
Y1 - 2014
N2 - Streptococcus pneumoniae is the most frequently isolated causative pathogen of community-acquired pneumonia, a leading cause of mortality worldwide. Inflammasomes are multiprotein complexes that play crucial roles in the regulation of inflammation. Nod-like receptor family, pyrin domain containing (NLRP) 3 is a sensor that functions in a single inflammasome, whereas adaptor apoptosis-associated speck-like protein containing a caspase activation and recruitment domain (ASC) is a common adaptor of several inflammasomes. We investigated the role of NLRP3 and ASC during S. pneumoniae pneumonia by comparing bacterial growth and spreading, and host innate immune responses in wild-type mice and mice deficient for either NLRP3 (Nlrp3(-/-)) or ASC (Asc(-/-)). Asc(-/-) mice had increased bacterial dissemination and lethality compared with Nlrp3(-/-) mice, although the cytokine response was impaired in both mouse strains. By detailed analysis of the early inflammatory response in the lung by whole-genome transcriptional profiling, we identified several mediators that were differentially expressed between Nlrp3(-/-) and Asc(-/-) mice. Of these, IL-17, granulocyte/macrophage colony-stimulating factor, and integrin-αM were significantly attenuated in Asc(-/-) relative to Nlrp3(-/-) mice, as well as a number of genes involved in the adaptive immune response. These differences may explain the increased susceptibility of Asc(-/ -) mice during S. pneumoniae infection, and suggest that either ASC-dependent NLRP3-independent inflammasomes or inflammasome-independent ASC functions may be involved
AB - Streptococcus pneumoniae is the most frequently isolated causative pathogen of community-acquired pneumonia, a leading cause of mortality worldwide. Inflammasomes are multiprotein complexes that play crucial roles in the regulation of inflammation. Nod-like receptor family, pyrin domain containing (NLRP) 3 is a sensor that functions in a single inflammasome, whereas adaptor apoptosis-associated speck-like protein containing a caspase activation and recruitment domain (ASC) is a common adaptor of several inflammasomes. We investigated the role of NLRP3 and ASC during S. pneumoniae pneumonia by comparing bacterial growth and spreading, and host innate immune responses in wild-type mice and mice deficient for either NLRP3 (Nlrp3(-/-)) or ASC (Asc(-/-)). Asc(-/-) mice had increased bacterial dissemination and lethality compared with Nlrp3(-/-) mice, although the cytokine response was impaired in both mouse strains. By detailed analysis of the early inflammatory response in the lung by whole-genome transcriptional profiling, we identified several mediators that were differentially expressed between Nlrp3(-/-) and Asc(-/-) mice. Of these, IL-17, granulocyte/macrophage colony-stimulating factor, and integrin-αM were significantly attenuated in Asc(-/-) relative to Nlrp3(-/-) mice, as well as a number of genes involved in the adaptive immune response. These differences may explain the increased susceptibility of Asc(-/ -) mice during S. pneumoniae infection, and suggest that either ASC-dependent NLRP3-independent inflammasomes or inflammasome-independent ASC functions may be involved
U2 - https://doi.org/10.1165/rcmb.2013
DO - https://doi.org/10.1165/rcmb.2013
M3 - Article
C2 - 24164497
SN - 1044-1549
VL - 50
SP - 699
EP - 712
JO - American journal of respiratory cell and molecular biology
JF - American journal of respiratory cell and molecular biology
IS - 4
ER -