Journal: Cell Death & Disease
Article Title: AURKA-mediated destabilization of SAPS3 drives ferroptosis evasion via 7-dehydrocholesterol biosynthesis in colorectal cancer
doi: 10.1038/s41419-026-08549-9
Figure Lengend Snippet: A Co-IP analysis of SAPS3 indicating reduced phosphorylation levels in SW480-sh AURKA cells. B Co-IP analysis of the phosphorylation levels of SAPS3 in SW480-sh AURKA cells reconstituted with WT-, T288D-, or D274N-AURKA. C Western blot analysis of SAPS3, total AMPK, pAMPK, pSREBP2, nSREBP2, and DHCR7 in SW480-sh AURKA cells expressing WT-, T288D-, or D274N-AURKA. D IC 50 analysis of RSL3 in SW480-sh AURKA cells expressing WT-, T288D-, or D274N-AURKA. E Representative FACS images and quantified values of lipid ROS levels in SW480-sh AURKA cells expressing WT-, T288D-, or D274N-AURKA. F LC-MS/MS identified Ser524 as AURKA-dependent phosphorylation sites in SAPS3. G Evolutionary conservation of SAPS3 S523/S524/Ser525 phosphorylation motifs across species (sequence alignment). H , I Co-IP analysis of phosphorylation levels for WT-, S523A-, S524A-, and S525A-SAPS3 mutants ( H ) or D-mut SAPS3 ( I ) in SW480 cells. J Co-IP analysis of WT or D-mut SAPS3 phosphorylation in SW480 cells treated with/without Alisertib (5 µM). K Western blot analysis of total AMPK, pAMPK, pSREBP2, nSREBP2, and DHCR7 levels in SW480 cells transfected with WT- or D-mut SAPS3, with/without Alisertib treatment. L , N Western blot analysis of WT- ( L ) or D-mut SAPS3 ( N ) protein stability at indicated timepoints after CHX (100 µg/ml) treatment in SW480-sh AURKA cells, comparing AURKA-reconstituted versus control conditions. M , O Quantified degradation kinetics (half-life) of WT- ( M ) or D-mut SAPS3 ( O ) from ( L , N ), respectively. P Western blot analysis of WT- or D-mut SAPS3 stability in CHX-treated SW480 cells, with/without MG132 (10 µM) under AURKA-expressing conditions. Q Western blot analysis of WT- or D-mut SAPS3 stability in CHX-treated SW480 cells, with/without BafA1 (200 ng/ml) under AURKA-expressing conditions. R Ubiquitination assays of WT- or D-mut SAPS3 in SW480 cells with/without AURKA expression. Data are presented as mean ± SD from at least three independent experiments. Statistical analyses were performed using unpaired Student’s t test ( E ) and two-way ANOVA test ( M , O ). *** p < 0.001.
Article Snippet: The human colorectal cancer cell lines SW480 (RRID: CVCL_0546), RKO (RRID: CVCL_0504), HCT116 (RRID: CVCL_0291), DLD1 (RRID: CVCL_0248), SW1116 (RRID: CVCL_1724), SW620 (RRID: CVCL_0547) and human embryonic kidney (HEK) 293 T (RRID: CVCL_0063) were obtained from the American Type Culture Collection (ATCC).
Techniques: Co-Immunoprecipitation Assay, Phospho-proteomics, Western Blot, Expressing, Liquid Chromatography with Mass Spectroscopy, Sequencing, Transfection, Control, Ubiquitin Proteomics