Fig. 3: CTSD knockdown in AML cells enhances the TRIM21-mediated ubiquitination and degradation of BCL2, BCL-XL, and MCL1. | Cell Death & Disease

Fig. 3: CTSD knockdown in AML cells enhances the TRIM21-mediated ubiquitination and degradation of BCL2, BCL-XL, and MCL1.

From: Cathepsin D promotes acute myeloid leukemia progression through stabilization of the anti-apoptotic proteins

Fig. 3

A Numbers of upregulated and downregulated differentially expressed proteins (DEPs). B Volcano plot of the distribution of DEPs in the proteomic analysis. C The protein levels of BCL2, BCL-XL, and MCL1 in U937 cells with or without CTSD knockdown were measured using western blotting. D Effects of CTSD knockdown on the degradation of BCL2, BCL-XL, and MCL1. CON- or CTSD-shRNA U937 cells were incubated with CHX (20 μg/mL) or CHX plus MG132 (10 μM) for the indicated times, and proteins were detected using western blotting. E Effects of CTSD knockdown on the ubiquitination of BCL2, BCL-XL, and MCL1 in U937 cells. Protein lysates were immunoprecipitated (IP) with anti-BCL2, anti-BCL-XL, or anti-MCL1 Abs. Ubiquitinated BCL2, BCL-XL, or MCL1 were detected using immunoblotting. F Venn diagram showing the common proteins containing TRIM21 identified in the mass spectrometry analysis of BCL2, BCL-XL, and MCL1. G The protein levels of TRIM21, FBXW7, PELI1, and ITCH in U937 cells with or without CTSD knockdown were detected using western blotting. H Ubiquitination of BCL2 after co-transfection with or without E3 ligase plasmid TRIM21 was detected using immunoblotting. I Ubiquitination of BCL-XL and MCL1 after co-transfection with or without TRIM21 were detected using immunoblotting. J The protein levels of CTSD and TRIM21 in U937 cells transfected with indicated CTSD-shRNA2 or TRIM21-shRNAs were detected by western blotting. K The protein levels of BCL2, BCL-XL, and MCL1 in U937 cells from the indicated shRNA transfection groups were measured using western blotting. L Flow cytometric analysis of apoptotic cell proportions in U937 cells from the indicated shRNA transfection groups. Annexin V+ cells were quantified using FlowJo software. Data are presented as the mean ± S.E.M. Statistical significance was calculated using a one-way ANOVA. M Growth curves of U937 cells from the indicated shRNA transfection groups. Data are presented as the mean ± S.E.M. Statistical significance was calculated using a two-way ANOVA.

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