NLRP3 Inflammasome Activation in Metabolic Disorders

The NLRP3 inflammasome is a cytosolic multiprotein complex that senses a broad range of metabolic danger signals—such as excess free fatty acids, cholesterol crystals, mitochondrial reactive oxygen species and lysosomal destabilisation—and converts them into a proinflammatory cascade. Its activation requires a two-step process: a priming signal that induces transcription of inflammasome components via NF-κB and a subsequent activation signal that triggers assembly of NLRP3 with the adaptor ASC and procaspase-1. Once assembled, caspase-1 is activated and mediates the maturation and release of interleukin-1β and interleukin-18, as well as cleavage of gasdermin D to initiate pyroptosis. In obesity, type 2 diabetes mellitus, non-alcoholic fatty liver disease and atherosclerosis, chronic low-grade activation of NLRP3 in macrophages, adipocytes, hepatocytes and endothelial cells sustains inflammation, exacerbates insulin resistance and promotes tissue remodelling. Crosstalk between metabolic tissues and immune cells further amplifies this inflammatory milieu. Therapeutic targeting of NLRP3—using small-molecule inhibitors, dietary unsaturated fatty acids or exercise interventions—has shown promise in preclinical models, demonstrating amelioration of glucose intolerance, lipid dysregulation and endothelial dysfunction. Continued elucidation of NLRP3 regulation across diverse cell types and metabolic contexts will be central to translating these findings into clinical strategies for preventing and treating metabolic disorders worldwide.

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NLRP3 Inflammasome Activation in Metabolic Disorders publication trend

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Technical terms

Inflammasome: Multiprotein complex that activates inflammatory caspases in response to cellular stress or danger signals.

NLRP3 inflammasome: Sensor complex composed of the NLRP3 receptor, ASC adaptor and procaspase-1 that governs production of interleukin-1β and interleukin-18.

Pyroptosis: Proinflammatory form of programmed cell death executed by gasdermin D pores following inflammasome activation.

Insulin resistance: Impaired cellular response to insulin signalling, leading to reduced glucose uptake and hyperglycaemia.

Proinflammatory cytokines: Signalling proteins, notably interleukin-1β and interleukin-18, that amplify and sustain inflammatory responses.

References

1. NLRP3 inflammasome: a key player in the pathogenesis of life-style disorders. Experimental & Molecular Medicine (2024).
2. NOD-like Receptors—Emerging Links to Obesity and Associated Morbidities. International Journal of Molecular Sciences (2023).
3. Role of the inflammasome in insulin resistance and type 2 diabetes mellitus. Frontiers in Immunology (2023).