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MicroRNA Expression Changes in Organotin-Driven NLRP3 Inflammasome Activation in Murine Bone Marrow Derived Macrophages

ABSTRACT: Trimethyltin (TMT) and triethyltin (TET) are two tri-organotin compounds, a group of substances reported to affect mitochondria function. These compounds were also found to activate the NLRP3 inflammasome, an inflammatory cascade that occurs in myeloid cells when primed with a Toll-like receptor ligand (i.e. LPS) followed by activation by an exogenous or endogenous danger signal. The inflammasome is a very tightly regulated mechanism, with several miRNAs playing an important role. To determine differential miRNA changes between TMT and TET induced inflammasome activation, miRNA expression profiles were evaluated in LPS-primed murine bone marrow derived macrophages (BMDMs) exposed to TMT or TET as compared to saline. mRNA expression arrays were also performed and analyzed to identify miRNA target genes in order to elucidate the key mechanism(s) by which TMT and TET activate the NLRP3 inflammasome pathway. These studies will help us understand the inflammasome regulation in macrophages by organotin.

ORGANISM(S): Mus musculus synthetic construct

PROVIDER: GSE155127 | GEO | 2021/05/05

REPOSITORIES: GEO

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Project description:Inflammasome, activated by pathogen-derived and host-derived danger signals, constitutes a multimolecular signaling complex that serves as a platform for caspase-1 (CASP1) activation and interleukin-1beta (IL1B) maturation. The activation of NLRP3 inflammasome requires two-step signals. The first “priming” signal (Signal 1) enhances gene expression of inflammasome components. The second “activation” signal (Signal 2) promotes the assembly of inflammasome components. Deregulated activation of NLRP3 inflammasome contributes to the pathological processes of Alzheimer’s disease (AD) and multiple sclerosis (MS). However, at present, the precise mechanism regulating NLRP3 inflammasome activation and deactivation remains largely unknown. By genome-wide gene expression profiling, we studied the molecular network of NLRP3 inflammasome activation-responsive genes in a human monocyte cell line THP-1 sequentially given two-step signals. We identified the set of 83 NLRP3 inflammasome activation-responsive genes. Among them, we found the NR4A nuclear receptor family NR4A1, NR4A2, and NR4A3, the EGR family EGR1, EGR2, and EGR3, the IkappaB family NFKBIZ, NFKBID, and NFKBIA as a key group of the genes that possibly constitute a negative feedback loop for shutting down inflammation following NLRP3 inflammasome activation. By molecular network analysis, we identified a complex network of NLRP3 inflammasome activation-responsive genes involved in cellular development and death, and immune and inflammatory responses, where transcription factors AP-1, NR4A, and EGR serve as a hub. Thus, NLRP3 inflammasome activation-responsive genes constitute the molecular network composed of a set of negative feedback regulators for prompt resolution of inflammation. To load the Signal 1 (S1), THP-1 cells were incubated for 3 hours in the culture medium with or without inclusion of 0.2 microgram/ml lipopolysaccharide (LPS). To load the Signal 2 (S2), they were incubated further for 2 hours in the culture medium with inclusion of 10 microM nigericin sodium salt dissolved in ethanol or the equal v/v% concentration of ethanol (vehicle), followed by processing for microarray analysis on Human Gene 1.0 ST Array (Affymetrix).

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MicroRNA Expression Changes in Organotin-Driven NLRP3 Inflammasome Activation in Murine Bone Marrow Derived Macrophages

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