Journal: Cellular and Molecular Life Sciences: CMLS
Article Title: ALDH2 inhibits head and neck tumorigenesis through RAS signaling suppression, transactivation of TGM2 , and synergy with ALDH6A1
doi: 10.1007/s00018-025-06027-7
Figure Lengend Snippet: Functional impacts of ALDH2 mutations on enzyme activity and tumor suppression via RAS-AKT signaling. (A) Schematic of lentiviral overexpression constructs: control (Lenti), wild-type ALDH2 [ALDH2(WT)], E504K mutant, phosphorylation-incapable mutants T261A, S488A, and double mutant T261A/S488A in FaDu and ALDH2 -knockdown Detroit 562 cells. (B-D) Quantification for ALDH activity (fluorometric assay, cell lysates), 4-HNE levels (ELISA, culture medium), and MDA levels (colorimetric assay, cell lysates). (E-G) Cellular phenotypes assessed by soft agar colony formation/MTT assay, transwell migration and invasion, and HUVEC tube formation following treatment with conditioned media from each group. (H , I) Immunoblot analysis and RAS pull-down assays evaluated expression of RAS-AKT-MAPK pathway proteins and active RAS (RAS-GTP). (J) NFκB transcriptional activity measured via Dual-Luciferase ® Reporter Assay following cotransfection with pGL3.21[ luc2P /NF-κB-RE/Hygro] (NFκB reporter) and pRL Renilla control vector (14:1 ratio). Data are presented as mean ± SD. Statistical significance: * p < 0.05, ** p < 0.01, *** p < 0.001
Article Snippet: Active RAS (RAS-GTP) levels were analyzed using the Ras Pull-down Activation Assay Biochem Kit (Bead Pull-Down Format, #BK008, Cytoskeleton, Denver, CO., USA).
Techniques: Functional Assay, Activity Assay, Over Expression, Construct, Control, Mutagenesis, Phospho-proteomics, Knockdown, Enzyme-linked Immunosorbent Assay, Colorimetric Assay, MTT Assay, Migration, Western Blot, Expressing, Luciferase, Reporter Assay, Cotransfection, Plasmid Preparation