Journal: Cancer Research Communications
Article Title: Age-Related Increases in IGFBP2 Increase Melanoma Cell Invasion and Lipid Synthesis
doi: 10.1158/2767-9764.CRC-23-0176
Figure Lengend Snippet: IGFBP2 induces fatty acid synthesis in melanoma cells. A, Western blot analysis of Igfbp2, phospho-Akt, total Akt and Hsp90 (loading control) from young and aged tumor lysate. Quantification of immunoblotting of Igfbp2 and phospho-Akt relative to Hsp90 loading control. B, Correlation analysis of IGFBP2 protein expression and p-AKT S473 expression from RPPA of melanoma PDX samples. C, Correlation analysis of IGFBP2 protein expression and p-AKT T308 expression from RPPA of melanoma PDX samples. D, Western blot analysis of melanoma cells (1205Lu) treated with recombinant IGFBP2 (100 ng/mL) at different times. Cells were probed for IGFBP2, phospho-AKT, total AKT, and HSP90 (loading control). E, Western blot analysis of IGFBP2 knockdown in aged fibroblasts. F, BODIPY (505/515) staining of human melanoma cells (1205Lu) cultured with aged fibroblast CM from fibroblasts transduced with empty vector (PLKO.1) or shRNA constructs (shIGFBP2). Quantification of BODIPY. G, BODIPY (505/515) staining of melanoma cells treated with CM from young fibroblasts treated with recombinant IGFBP2 (50 and 100 ng/mL). Quantification of BODIPY. H, RT-PCR of IGFBP2 expression in melanoma cells after treatment with young or aged CM. I, Western blot analysis of IGFBP2, P-AKT, total AKT, and HSP90 in melanoma cells transfected with either an empty vector control (CTRL) or IGFBP2 (IGFBP2 OE). J, BODIPY (493/503) staining of melanoma cells after transfection with either control or IGFBP2 constructs with quantification. GraphPad Prism 8 was used for plotting graphs and statistical analysis. Unpaired t test was performed.
Article Snippet: Tumors were allowed to grow, and treatment with rIgfbp2 (674-B2-025 from R&D Systems), Igfbp2-neutralizing antibody (AF674 from R&D Systems), or IgG control (AB-105-C from R&D Systems) was administered. rIGFBP2 experiments: young mice were injected intraperitoneally with 500 ng of rIgfbp2 in 100 μL of PBS every 2 days until tumors reach a maximum of 2,000 mm 3 .
Techniques: Western Blot, Control, Expressing, Recombinant, Knockdown, Staining, Cell Culture, Transduction, Plasmid Preparation, shRNA, Construct, Reverse Transcription Polymerase Chain Reaction, Transfection