C3a receptor agonist 1

Carrageenan-induced paw edema is an acute inflammation model in which intraplantar injection of carrageenan induces localized inflammatory swelling characterized by vascular permeability, leukocyte infiltration, and production of inflammatory mediators such as prostaglandins and cytokines, making it widely used to evaluate anti-inflammatory agents in vivo. The resulting paw volume or thickness increase is quantified over time as a direct readout of inflammatory intensity and drug efficacy, typically reflecting cyclooxygenase-mediated prostaglandin-driven edema formation and immune cell recruitment in peripheral tissue[20].

Zymosan-induced peritonitis is a sterile acute-inflammation model produced by intraperitoneal injection of zymosan, a yeast cell-wall particle preparation, followed by quantification of leukocyte recruitment and soluble inflammatory mediators in peritoneal lavage fluid. Low-dose zymosan peritonitis is commonly used as a self-resolving acute inflammation model in which neutrophil recruitment occurs early and monocyte/macrophage accumulation follows later. The assay readouts include total peritoneal leukocyte number, differential neutrophil and monocyte/macrophage counts, peritoneal cytokines and chemokines, plasma or peritoneal exudation, and optional lipidomic or metabolomic changes during inflammation and resolution. Early neutrophil recruitment after zymosan depends strongly on complement and mast-cell C5a receptor signaling, whereas later monocyte recruitment is linked to MCP-1/CCL2 production.

The NLRP3 inflammasome is a cytosolic innate immune signaling platform that integrates priming signals and danger-signal activation to promote caspase-1 activation, maturation of IL-1β and IL-18, and gasdermin D-mediated pyroptotic cell death. The core experimental logic is to determine whether inflammatory disease phenotypes are driven by increased NLRP3 expression, ASC-containing inflammasome assembly, caspase-1 cleavage, GSDMD cleavage, and extracellular release of IL-1β/IL-18 rather than by nonspecific cell injury alone. The pathway is strongly linked to inflammation-related disease phenotypes because monosodium urate crystals activate NALP3/NLRP3 inflammasome signaling in gout-like crystal inflammation, cholesterol crystals activate NLRP3 inflammasomes in atherogenesis models, and DSS-induced intestinal inflammation has been reported to involve NLRP3 inflammasome activity. However, experimental colitis studies also show context-dependent protective effects of NLRP3 inflammasome co