Journal: Advanced Science
Article Title: MeCP2 Lactylation Protects against Ischemic Brain Injury by Transcriptionally Regulating Neuronal Apoptosis
doi: 10.1002/advs.202415309
Figure Lengend Snippet: MeCP2 lactylation regulates neuronal apoptosis after stroke. A) Heatmap depicting differential lactylation at specific lysine residues of proteins involved in the regulation of neuronal death after stroke. B) PRM quantification of MeCP2 K210 lactylation levels in the brains of sham and MCAO mice ( n = 3 mice per group). C) MeCP2 was immunoprecipitated from sham and MCAO brain tissues, and pan‐Kla and MeCP2 levels were analyzed by Western blot. D) Representative immunofluorescence images showing the proximity ligation assay used to validate MeCP2 lactylation in neurons within the cortex of MCAO mice. Red, in situ PLA detection of MeCP2 and pan‐Kla; green, NeuN; blue, DAPI. E) Heatmap showing differentially lactylated proteins involved in transcriptional regulation between sham and MCAO groups. F) The binding density of MeCP2 was visualized by deepTools: the heatmap presents the CUT&Tag counts at different MeCP2 binding peaks across different treatment groups, ordered by signal strength. G) Distribution of MeCP2 binding peaks across genomic regions in cortical tissues from sham‐operated mice and MCAO mice treated with saline, 2‐DG or 4‐CIN. H) GO enrichment analysis of downregulated and upregulated genes associated with MeCP2 binding sites in the penumbra from MCAO mice. I) Genome browser tracks of MeCP2 CUT&Tag peaks at Pdcd4 and Pla2g6 loci across treatment groups. The purple rectangles indicate the peak regions of MeCP2 on target‐gene promoters. J) Luciferase reporter assay showing relative activity at Pdcd4 and Pla2g6 peaks in HEK293T cells expressing HA‐MeCP2 or HA‐GFP ( n = 3 per group). K) Western blot showing over‐expression of MeCP2 in HEK293 cells, with β‐actin as a loading control. L) Relative luciferase activity at Pdcd4 and Pla2g6 peaks in wild‐type (WT) and MeCP2 −/− HEK293T cells ( n = 4 per group). M) Motif enrichment analysis of MeCP2 binding sites, highlighting top enriched motifs with corresponding p ‐values. N) EMSA demonstrating MeCP2 binding to the CpG‐rich promoters of the target genes Pdcd4 and Pla2g6 . O) ChIP‐qPCR quantification of MeCP2 enrichment at Pdcd4 and Pla2g6 promoter in sham mice and MCAO mice treated with saline, 2‐DG or 4‐CIN ( n = 4 per group). P) Cortical expression of Pdcd4 and Pla2g6 determined by qPCR in sham mice and MCAO mice treated with saline, 2‐DG or 4‐CIN ( n = 5–6 per group). Data are presented as mean ± SEM. # p < 0.05 versus sham control; * p < 0.05, ** p < 0.01, *** p < 0.001 versus MCAO control; ns, not significant.
Article Snippet: The following primary antibodies were used: Anti‐L‐Lactyl Lysine Rabbit mAb (Cat. PTM‐1401, PTM BIO, China), Anti‐lacty‐MeCP2(Lys210) rabbit pAb (PTM BIO, China), Anti‐lacty‐MeCP2(Lys249) rabbit pAb (PTM BIO, China), Rabbit monoclonal anti‐MeCP2 (Cat. 3456, Cell Signaling Technology, USA), Rabbit monoclonal anti‐PDCD4 (Cat. 9535, Cell Signaling Technology, USA), Rabbit monoclonal anti‐HA‐Tag (Cat. 3724, Cell Signaling Technology, USA), Rabbit polyclonal anti‐Cleaved Caspase‐3 (Cat. 9661, Cell Signaling Technology, USA), Rabbit monoclonal anti‐HDAC1 (Cat. 34589, Cell Signaling Technology, USA), Mouse monoclonal anti‐HDAC2 (Cat. 5113, Cell Signaling Technology, USA), Mouse monoclonal anti‐HDAC3 (Cat. 3949, Cell Signaling Technology, USA), Rabbit monoclonal anti‐CHOP (Cat. 5554, Cell Signaling Technology, USA), Rabbit monoclonal anti‐Caspase‐1 (Cat. 24232, Cell Signaling Technology, USA), Rabbit monoclonal anti‐Phospho‐RIP3 (Thr231/Ser232) (Cat. 91702, Cell Signaling Technology, USA), Mouse monoclonal anti‐AlaRS (Cat. sc‐165990, Santa Cruz Biotechnology, USA), Mouse monoclonal anti‐p300 (Cat. sc‐48343, Santa Cruz Biotechnology, USA), Mouse monoclonal anti‐CBP (Cat. sc‐7300, Santa Cruz Biotechnology, USA), Mouse monoclonal anti‐group VI iPLA2 (Cat. sc‐376563, Santa Cruz Biotechnology, USA), Mouse monoclonal anti‐PCAF (Cat. sc‐13124, Santa Cruz Biotechnology, USA), Mouse monoclonal anti‐KAT2A/GCN5(Cat. 66575‐1‐lg, Proteintech, China), Rabbit polyclonal anti‐RIP3 (Cat. 17563‐1‐lg, Proteintech, China), Mouse monoclonal anti‐b‐actin (Cat. 66009‐1‐lg, Proteintech, China), Mouse GAPDH Monoclonal antibodies (Cat. 60004‐1‐Ig, Protsintech, China).
Techniques: Immunoprecipitation, Western Blot, Immunofluorescence, Proximity Ligation Assay, In Situ, Binding Assay, Saline, Luciferase, Reporter Assay, Activity Assay, Expressing, Over Expression, Control, ChIP-qPCR