Journal: International Journal of Molecular Medicine
Article Title: m 6 A in adipose tissue inflammation: A novel regulator of obesity and metabolic diseases (Review)
doi: 10.3892/ijmm.2026.5795
Figure Lengend Snippet: Role of m 6 A in ATMs. ATMs are deeply involved in adipose tissue inflammation, and m 6 A plays critical roles in macrophage biology, including their development, activation, pyroptosis and metabolism of lipids. (A) m 6 A regulates macrophage development by targeting genes such as CCND1 and ATRX via YTHDF3, ALKBH5 and METTL3, affecting haematopoietic stem and progenitor cell differentiation. (B) m 6 A modification mediated by METTL3, METTL14 and IGF2BP2 controls macrophage activation and polarization by influencing key genes such as SPRED2, MYD88 and STAT1, which impact the NF-κB and PPAR-γ pathways. (C) m 6 A regulates macrophage pyroptosis by targeting CASPASE-1, IL-1β and MALAT1 and modulating pathways such as the PTBP1/USP8/TAK1 pathway. (D) Additionally, m 6 A affects macrophage lipid metabolism by regulating lipid uptake and cholesterol efflux through MSR1 and SR-B1. m 6 A, N6-methyladenine; ATMs, adipose tissue macrophages; CCND1, cyclin D1; ATRX, α-thalassemia X-linked intellectual disability syndrome; YTHDF3, YTH domain family 3; ALKBH5, alkB homologue 5; METTL, methyltransferase-like; IGF2BP2, insulin-like growth factor 2 mRNA-binding protein 2; SPRED2, sprouty-related EVH1 domain-2; MYD88, myeloid differentiation primary response 88; STAT1, signal transducer and activator of transcription 1; NF-κB, nuclear factor-κB; PPAR-γ, peroxisome proliferator-activated receptor γ; CASPASE-1, cysteinyl aspartate specific proteinase-1; IL, interleukin; MALAT1, metastasis-associated lung adenocarcinoma transcript 1; PTBP1, polypyrimidine tract-binding protein 1; USP8, ubiquitin-specific peptidase 8; TAK1, TGFβ-activated kinase 1; MSR1, macrophage scavenger receptor 1; SR-B1, scavenger receptor type B1; ROS, reactive oxygen species; TSC1, tuberous sclerosis complex 1; SOCS2, suppressor of cytokine signalling 2; GSDMD-N, gasdermin D N-terminal domain; OxLDL, oxidized low-density lipoprotein; MSR1, macrophage scavenger receptor 1; DDX5, DEAD-box helicase 5; MEHP, mono(2-ethylhexyl) phthalate.
Article Snippet: In addition, for mitotic clone amplification (MCE) in the early stage of terminal differentiation, the inhibition of FTO expression in 3T3-L1 cells leads to increased m 6 A methylation levels of cyclin D1 (CCND1) and cyclin-dependent kinase 2, the protein expression of which is reduced after recognition by YTHDF2, resulting in blockade of the MCE process and in turn the inhibition of lipogenesis ( ) ( ).
Techniques: Activation Assay, Cell Differentiation, Modification, Binding Assay, Ubiquitin Proteomics