Journal: Neural Regeneration Research
Article Title: Melatonin alleviates neuroinflammation in ischemic stroke by regulating cyclic GMP-AMP synthase– mediated microglial pyroptosis signaling
doi: 10.4103/NRR.NRR-D-24-01070
Figure Lengend Snippet: Melatonin suppresses NF-κB/NLRP3 inflammasome activation and microglial pyroptosis in the ischemic brain. (A) Representative western blotting images of NF-κB/NLRP3 inflammasome proteins in ischemic brain tissues and sham controls treated with MLT or vehicle at 72 hours after reperfusion after MCAO. (B) Quantification of the western blotting data. n = 6 per group. Data are presented as mean ± SD. * P < 0.05, ** P < 0.01, *** P < 0.001 (one-way analysis of variance followed by Tukey’s post hoc test). (C) Chromatin immunoprecipitation (ChIP) assay of NF-κB and GSDMD in BV2 cells treated with lipopolysaccharide. n = 3 per group. The JASPAR website predicted the existence of a binding site between NF-κB and the GSDMD promoter region ( Additional Figure 1 ). Data are presented as mean ± SD. ** P < 0.01 (Student’s t -test). (D) Double immunostaining for Iba-1 (green) and GSDMD (red) at 72 hours after MCAO in the peri-ischemic area as well as in the corresponding regions of sham control brains, both of which were treated with MLT or vehicle. Nuclei were stained with DAPI (blue). Scale bar: 20 μm (10 μm in the magnified images). Arrowheads indicate GSDMD-double-positive cells with microglia-specific markers. All experiments were conducted in triplicate. cGAS: Cyclic GMP-AMP synthase; DAPI: 4′,6-diamidino-2-phenylindole; GSDMD: gasdermin D; Iba-1: ionized calcium-binding adapter molecule 1; IL: interleukin; MCAO: middle cerebral artery occlusion; MLT: melatonin; NF-κB: nuclear factor kappa-B; NLRP3: NOD-like receptor family pyrin domain-containing protein 3; ns: not significant.
Article Snippet: BV2 cells were obtained from Servicebio (Wuhan, Hubei, China; Cat# STCC20009G-1) and cultivated in Dulbecco’s modified Eagle’s medium (DMEM; Gibco, Carlsbad, CA, USA) supplemented with 10% fetal bovine serum (FBS; Gibco), and 100 U/mL penicillin and 100 mg/mL streptomycin (Gibco) at 37°C in a humidified cell incubator.
Techniques: Activation Assay, Western Blot, Chromatin Immunoprecipitation, Binding Assay, Double Immunostaining, Control, Staining