Journal: bioRxiv
Article Title: Investigation of CD36 interactome provides insights into multimolecular complexes necessary for anti-angiogenic signalling
doi: 10.1101/2025.07.15.664851
Figure Lengend Snippet: ( A ) Levels of active Fyn determined by immunostaining of pSFK in cells stimulated or not with anti-CD36 IgM antibodies. TIME HT-CD36 cells expressing no shRNAs or scrambled, CD9 or ITGB1 shRNAs were stimulated (+) or not (-) with mouse anti-CD36 IgM (10 µg/mL) for 15 min. Cells were fixed, immunostained for pSFK and imaged by TIRF microscopy using identical parameters for all conditions. The levels of pSFK were determined using Cell Profiler by measurement of the mean intensity of pSFK for each cell. Cell segmentation was done using F-actin labeling. The boxplots indicate the median intensity of pSFK per cell and statistical comparisons were done using non-parametric T-test between stimulated and unstimulated conditions. Results are from 3 experiments and a minimum of 64 cells analyzed per condition. ( B ) Summary of conditional colocalization measurements indicating the effect CD9 on the colocalization between CD36 and pSFK. TIME HT-CD36 cells were stimulated (bottom panel) or not (top panel) with anti-CD36 IgM for 15 min, and immunostained for conditional colocalization with HT-JF549X, anti-pSFK-AF488 and anti-CD9 AF647. Statistical analysis as for F. A minimum of 75 cells per conditions were imaged across 3 experiments. ( C ) Summary of conditional colocalization measurements indicating the effect of active ITGB1 on the colocalization between CD36 and pSFK as in (B). TIME HT-CD36 cells were stimulated (bottom panel) or not (top panel) with anti-CD36 IgM for 15 min, and immunostained for conditional colocalization with HT-JF549X, anti-pSFK-AF488 and anti-active ITGB1 AF647. At least 53 cells per condition were imaged across 3 experiments. Comparisons shown as in (C). ( D-E ) Effect of silencing ITGB1 ( D ) or CD9 ( E ) on CD36 and pSFK conditional colocalization measurements highlighted in panel B (blue) and C (brown). TIME HT-CD36 cells expressing indicated shRNA and stimulated or not with IgM anti-CD36 were processed for conditional colocalization between CD36, pSFK and either CD9 (D) or ITGB1 (E). A non-parametric Kruskal-Wallis test followed by Dunn’s post-hoc test were used to determine statistical differences between stimulated and unstimulated conditional colocalization experiments. Data are from 3 experiments and a minimum of 50 cells analysed.
Article Snippet: For immunostaining, cells were permeabilized and block simultaneously (PBS with 0.1% TX-100 and 3% BSA) for 30 min at room temperature, before being incubated with rabbit anti-P-Y420-Src (pSFK) antibody coupled to AF488 (ThermoFisher, 44-660A1) and phalloidin-AF568 (ThermoFisher, ref: A12380).
Techniques: Immunostaining, Expressing, Microscopy, Labeling, shRNA