Paracaspase MALT1 regulates glioma cell survival by controlling endo-lysosome homeostasis (2019)
Figure 3

Figure 3. MALT1 is active in GSCs

A. Total protein lysates from GSCs #1 and #9 challenged with TNFα (10 ng/mL, for the indicated times) were analyzed by western-blot for p-IκBα, IκBα and p-JNK. Total JNK and GAPDH served as loading controls.

B. Western-blot analysis of p65, cREL, and RELB in cytosolic (cyt) and nuclear (nuc) cell fractionation from GSC#1 and GSC#9 stimulated with TNFα (10 ng/mL, for the indicated times). TUBULIN and PARP served as controls for each fraction.

C. Jurkat T-cells, GSC#1 and GSC#9 were stimulated with PMA (20 ng/mL) and Ionomycin (Iono, 300 ng/mL) for 30 minutes. Total protein lysates were analyzed by western-blot for CYLD (full length FL and cleaved c'd), HOIL1 (full length FL and cleaved c'd), p-IκBα and IκBα. MALT1 and BCL10 served as loading controls.

D. Jurkat T-cells, GSC#1 and GSC#9 were treated with vehicle (DMSO) and mepazine (MPZ, 20 μM) for 4 hours. PMA/Ionomycin mixture was also administered to Jurkat cells for the last 30 minutes. Total protein lysates were analyzed by western-blot for CYLD (full length FL and cleaved c'd). MALT1 served as a loading control.

E. Western-blot analysis of CYLD (full length, FL and cleaved, c'd) and MALT1 in total protein lysates from GSC#9 transfected with non-silencing RNA duplexes (sic) or MALT1 targeting duplexes (siMALT1). GAPDH served as a loading control. Densitometric analysis of c'd CYLD/FL CYLD was performed (right). Data are presented as the mean + s.e.m. on 5 independent experiments.

F. (Left) Western-blot analysis of CYLD, ROQUIN1/2, MALT1, and BCL10 in total protein lysates from GSC#9 treated for 4 hours with vehicle (H2O) or Z-VRPR-FMK (75 μM). GAPDH served as a loading control. (Right) Densitometric analysis of c'd/FL was performed for ROQUIN1/2 and CYLD. Data are presented as the mean + s.e.m. on 3 independent experiments.

G. Schematic drawing of MALT1 structures highlighting the C464A substitution in the protease-dead version. DD: Death Domain, C-like D: Caspase-like Domain, Ig: Immunoglobulin domain.

H. Western-blot analysis of CYLD and FLAG in total protein lysates from GSC#9 transfected with WT or C464A MALT1-FLAG. GAPDH served as a loading control.

I. Western-blot of CYLD (full length FL and cleaved c'd) in total protein lysates from GSC#9 after refreshing the medium (+), as compared to 3 days-old culture (-). GAPDH served as a loading control. Densitometric analysis of c'd/FL CYLD was performed. Data are presented as the mean + s.e.m. on 5 independent experiments.

J. Western-blot analysis of CYLD (full length FL and cleaved c'd) in total protein lysates from GSC#9 transfected with non-silencing RNA duplexes (sic) or CARD10 targeting duplexes (siCARD10 seq#1, seq#2, and seq#3). GAPDH served as a loading control. qPCR analysis confirmed the knock-down of CARD10 in GSC#9. Data are presented as the mean + s.e.m. on 3 independent experiments.

K. Western-blot analysis of CYLD and BCL10 in total protein lysates from GSC#9 transfected with non-silencing RNA duplexes (sic) or BCL10 targeting duplexes (siBCL10, seq#1 and seq#3). GAPDH served as a loading control. Cell viability was measured using Cell TiterGlo luminescent assay in sic and seq#1 siBCL10-transfected cells. Data were normalized to their respective sic-treated controls and are presented as the mean + s.e.m of 3 independent experiments, in triplicate.

Data information: All data are representative of n=3, unless specified. Statistics were performed using a two-tailed t-test with a 95% confidence interval. *p<0.05, **p<0.01, ***p<0.001.

Source data are available online for this figure.