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Pharmacological inhibition of IKKβ dampens NLRP3 inflammasome activation after priming in the human myeloid cell line THP-1. | LitMetric

AI Article Synopsis

Article Abstract

The NLRP3 inflammasome is a critical component of the innate immune response to sterile inflammation. Its regulation involves a priming step, required for up-regulation of inflammasome protagonists and an activation step leading to NLRP3 inflammasome complex assembly, which triggers caspase-1 activity. The IκKβ kinase regulates canonical NF-κB, a key pathway involved in transcriptional priming. We found that IκKβ also regulates the activation and function of the NLRP3 inflammasome beyond the priming step. Two unrelated IκKβ inhibitors, AFN700 and TPCA-1, when applied after priming, fully blocked IL-1β secretion triggered by nigericin in THP-1 cells. Both inhibitors prevented neither inflammasome assembly, as monitored by measuring the formation of ASC specks, nor the generation of caspase-1 p20, a hallmark of caspase-1 activity, but they impaired the initial cleavage and activation of procaspase-1. These data thus indicate that IκKβ activity is required for efficient activation of NLRP3, suggesting that IκKβ may fulfill a dual role in coupling priming and activation of the NLRP3 inflammasome.

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http://dx.doi.org/10.1016/j.bbrc.2021.01.051DOI Listing

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