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AGO promotes lysosomal degradation of SDC4-CTF. A , Western blot of SDC1/4 CTF and full-length in SW480 cells treated with AGO (indicated doses, 24 h; n = 3). B , Western blot in SW480 cells treated with 20 μM AGO for 0 to 24 h. C and D , immunofluorescence detection and quantification of SDC4 in SW480 cells treated with 20 μM AGO (24 h; n = 6). E , surface SDC4 measured by FACS using FITC-anti-SDC4. F , Western blot of SDC1/4 CTF and full-length in HCT116 cells treated with AGO (indicated doses, 24 h). G , Western blot of SDC4-CTF in multiple colorectal cancer cells treated with 20 μM AGO (24 h). H , Western blot of SDC1-CTF and SDC4-CTF in SW480 cells treated with cycloheximide (50 μg/ml) along with/without 20 μM AGO for indicated times. I , RT-qPCR of indicated genes in SW480 cells treated with 20 μM AGO (24 h; n = 4). J , Western blot of SDC1-CTF and SDC4-CTF in SW480 cells treated with 20 μM AGO, 2.5 μM GM6001, 10 μM TMI-1, or combinations (24 h). K , Western blot in SW480 cells treated with 20 μM AGO, 5 μM BAY11 to 7082, 10 nM PMA, 1 μg/ml LPS, or 20 μg/ml TNFα (24 h). L and M , live-cell imaging and analysis of SDC4-GFP intensity in 293T cells co-expressing DsRed-Rab5A and SDC4-GFP, with 20 μM AGO treatment (n = 4). O , Western blot of lysosome markers and SDC1/4-CTF in SW480 cells treated with 20 μM AGO, 250 nM BAF1, or combination (24 h). Data: mean ± SD (≥3 experiments). Statistics: unpaired two-tailed t test (∗ p < 0.05, ∗∗ p < 0.001, ∗∗∗∗ p < 0.0001, ns). AGO, andrographolide; SDC4, Syndecan4; CTF, C-terminal transmembrane fragment; FACS, fluorescence-activated cell sorting; BAF1, Bafilomycin A1.

Journal: The Journal of Biological Chemistry

Article Title: Andrographolide targets syndecan4 to impair its interaction with syntenin and inhibits the biogenesis of small extracellular vesicles

doi: 10.1016/j.jbc.2026.111182

Figure Lengend Snippet: AGO promotes lysosomal degradation of SDC4-CTF. A , Western blot of SDC1/4 CTF and full-length in SW480 cells treated with AGO (indicated doses, 24 h; n = 3). B , Western blot in SW480 cells treated with 20 μM AGO for 0 to 24 h. C and D , immunofluorescence detection and quantification of SDC4 in SW480 cells treated with 20 μM AGO (24 h; n = 6). E , surface SDC4 measured by FACS using FITC-anti-SDC4. F , Western blot of SDC1/4 CTF and full-length in HCT116 cells treated with AGO (indicated doses, 24 h). G , Western blot of SDC4-CTF in multiple colorectal cancer cells treated with 20 μM AGO (24 h). H , Western blot of SDC1-CTF and SDC4-CTF in SW480 cells treated with cycloheximide (50 μg/ml) along with/without 20 μM AGO for indicated times. I , RT-qPCR of indicated genes in SW480 cells treated with 20 μM AGO (24 h; n = 4). J , Western blot of SDC1-CTF and SDC4-CTF in SW480 cells treated with 20 μM AGO, 2.5 μM GM6001, 10 μM TMI-1, or combinations (24 h). K , Western blot in SW480 cells treated with 20 μM AGO, 5 μM BAY11 to 7082, 10 nM PMA, 1 μg/ml LPS, or 20 μg/ml TNFα (24 h). L and M , live-cell imaging and analysis of SDC4-GFP intensity in 293T cells co-expressing DsRed-Rab5A and SDC4-GFP, with 20 μM AGO treatment (n = 4). O , Western blot of lysosome markers and SDC1/4-CTF in SW480 cells treated with 20 μM AGO, 250 nM BAF1, or combination (24 h). Data: mean ± SD (≥3 experiments). Statistics: unpaired two-tailed t test (∗ p < 0.05, ∗∗ p < 0.001, ∗∗∗∗ p < 0.0001, ns). AGO, andrographolide; SDC4, Syndecan4; CTF, C-terminal transmembrane fragment; FACS, fluorescence-activated cell sorting; BAF1, Bafilomycin A1.

Article Snippet: Proximity ligation assay was performed according to the protocol provided by Sigma-Aldrich (DUO092101), and the primary antibodies and dilutions are anti-SDC4 (sc12766, 1:100), anti-Syntenin (22399-1-AP, 1:400, Proteintech).

Techniques: Western Blot, Immunofluorescence, Quantitative RT-PCR, Live Cell Imaging, Expressing, Two Tailed Test, Fluorescence, FACS