β-arrestin1 is critical for the full activation of NLRP3 and NLRC4 inflammasomes.

Abstract

Inflammasomes are multiprotein complexes that trigger the activation of caspase-1 and the maturation of IL-1β, which are critical for inflammation and control of pathogen infection. Although the function of inflammasomes in immune response and disease development is well studied, the molecular mechanism by which inflammasomes are activated and assembled remains largely unknown. In this study, we found that β-arrestin1, a key regulator of the G protein-coupled receptor signaling pathway, was required for nucleotide-binding domain and leucine-rich repeat containing (NLR) family pyrin domain-containing 3 (NLRP3) and NLR family CARD domain-containing protein 4 (NLRC4) inflammasome-mediated IL-1β production and caspase-1 activation, but it had no effect on absent in melanoma 2 (AIM2) inflammasome activation. Moreover, apoptosis-associated speck-like protein containing a CARD (ASC) pyroptosome, which is ASC aggregation mediating caspase-1 activation, was also impaired in β-arrestin1-deficient macrophages upon NLRP3 or NLRC4, but not AIM2 inflammasome activation. Mechanistic study revealed that β-arrestin1 specifically interacted with NLRP3 and NLRC4 and promoted their self-oligomerization. In vivo, in a monosodium urate crystal (MSU)-induced NLRP3-dependent peritonitis model, MSU-induced IL-1β production and neutrophil flux were significantly reduced in β-arrestin1 knockout mice. Additionally, β-arrestin1 deficiency rescued the weight loss of mice upon log-phase Salmonella typhimurium infection, with less IL-1β production. Taken together, our results indicate that β-arrestin1 plays a critical role in the assembly and activation of two major canonical inflammasomes, and it may provide a new therapeutic target for inflammatory diseases.

• Authors: Kairui Mao, Shuzhen Chen, Yan Wang, Yan Zeng, Yonglei Ma, Yu Hu, Hong Zhang, Shuhui Sun, Xiaodong Wu, Guangxun Meng, Gang Pei, Bing Sun
• Journal: Journal of immunology (Baltimore, Md. : 1950) (J Immunol) Vol. 194 Issue 4 Pg. 1867-73 (Feb 15 2015) ISSN: 1550-6606 [Electronic] United States
• PMID: 25582856 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2015 by The American Association of Immunologists, Inc.

Chemical References

• Apoptosis Regulatory Proteins
• Arrestins
• Calcium-Binding Proteins
• Carrier Proteins
• Inflammasomes
• Ipaf protein, mouse
• NLR Family, Pyrin Domain-Containing 3 Protein
• Nlrp3 protein, mouse
• beta-Arrestins

Topics

• Animals
• Apoptosis Regulatory Proteins (immunology)
• Arrestins (immunology)
• Calcium-Binding Proteins (immunology)
• Carrier Proteins (immunology)
• Disease Models, Animal
• HEK293 Cells
• Humans
• Immunoblotting
• Immunoprecipitation
• Inflammasomes (immunology)
• Macrophages (immunology)
• Mice
• Mice, Inbred C57BL
• Mice, Knockout
• Microscopy, Confocal
• NLR Family, Pyrin Domain-Containing 3 Protein
• Peritonitis (immunology)
• Salmonella Infections, Animal (immunology)
• Salmonella typhimurium (immunology)
• beta-Arrestins