human nsclc cell lines a549  (ATCC)

Journal: Redox Biology

Article Title: USP20 governs tyrosine kinase inhibitors resistance through ferroptosis evasion by targeting GPX4 in cancers

doi: 10.1016/j.redox.2026.104086

Figure Lengend Snippet: USP20 directly interacts with GPX4. ( A ) Immunoblot analysis of target proteins in sorafenib-resistant 769-P and A549 cells following 24 h treatment with specific deubiquitinase inhibitors. ML-323: 10 μM, GSK2643943A: 10 μM, XL177A: 10 μM, Spautin-1: 10 μM, IU1: 10 μM, AZ1: 10 μM, MF-094: 10 μM, LDN-57444: 10 μM, TCID: 10 μM, PR-619: 10 μM, BAY11-7082: 10 μM, EOAI3402143: 2.5 μM, ML364: 10 μM, b-AP15: 0.5 μM. ( B ) HEK293T cells were transfected with GST-GPX4 and Flag-USP. The cell lysate was applied with GST pull-down, then analyzed with immunoblot for indicated proteins. ( C ) 769-P and A549 cells were subjected to immunoprecipitate with anti-GPX4 antibodies, then analyzed with immunoblot for indicated proteins. ( D ) Overview of USP20 structures. ( E-F ) HEK293T cells transfected with the indicated USP20 structures and Flag-GPX4 were subjected to pull-down with GSH beads or immunoprecipitate with anti-Flag antibody, then analyzed with immunoblot for indicated proteins. ( G ) 769-P and A549 cells were subjected to subcellular fractionation, then analyzed with immunoblot for indicated proteins. ( H ) Overview of GPX4 isoforms structures. ( I ) HEK293T cells transfected with the indicated GPX4 isoforms and GST-USP20 were subjected to immunoprecipitate with anti-Flag antibody, then analyzed with immunoblot for indicated proteins. ( J ) HEK293T cells transfected with the GST-USP20 WT/C154S and Flag-GPX4 were subjected to immunoprecipitate with anti-Flag antibody, then analyzed with immunoblot for indicated proteins.

Article Snippet: Human RCC cell lines 769-P, 786-O and SW839, human NSCLC cell lines A549, H1299 and the HEK-293T cell line were obtained from the American Type Culture Collection and cultured in RPMI-1640 or DMEM medium (Thermo Fisher Scientific, Inc.) added with 10% fetal bovine serum (FBS) (Thermo Fisher Scientific, Inc.),100 U/ml penicillin and 0.1 mg/ml streptomycin (Thermo Fisher Scientific, Inc.) at a temperature of 37 °C.

Techniques: Western Blot, Transfection, Fractionation

Journal: Redox Biology

Article Title: USP20 governs tyrosine kinase inhibitors resistance through ferroptosis evasion by targeting GPX4 in cancers

doi: 10.1016/j.redox.2026.104086

Figure Lengend Snippet: USP20 elevates GPX4 protein abundance through post-translational regulation. ( A ) Western blot analysis of GPX4 and USP20 proteins in 769-P and A549 cells transfected with lentivirus carrying shUSP20 or negative control. ( B ) Western blot analysis of GPX4 and USP20 proteins in 786-O and HEK 293T cells transfected with GST-USP20 plasmids or vector. ( C-D ) Analysis of GPX4 and USP20 mRNA expression in shScr and shUSP20 769-P and A549 cells. ( E-H ) shScr and shUSP20 769-P (E-F) and A549 (G-H) cells were treated with 100 μg/mL CHX at indicated time points. The GPX4 protein abundance was quantified by the Image J and statistical charts are produced by GraphPad. ( I-J ) shScr and shUSP20 769-P and A549 cells were treated with 20 μM MG132 for 6 h or 20 μM CQ for 12 h, and then assessed GPX4 expression. ( K ) Western blot analysis of GPX4 proteins in HEK293 cells transfected with GST-USP20 WT or GST-USP20 C154S plasmids. ( L-M ) Western blot analysis of GPX4 proteins in USP20 knockdown HEK293 cells transfected with GST-Vector, GST-USP20 WT or GST-USP20 C154S plasmids. The GPX4 protein abundance was quantified by the Image J software and statistical charts are produced by GraphPad. ( N ) Western blot analysis of GPX4 proteins in 769-P, SW839, A549, H1299 cells treated with indicated concentration GSK2643943A for 24 h. ( O–R ) The 769-P and A549 cells were treated with 10 μM GSK2643943A for 24 h, then 100 μg/mL CHX at indicated time points. The GPX4 protein abundance was quantified by the Image J software and statistical charts are produced by GraphPad. Data in C and D are presented as mean ± s.d. of n = 3 biological replicates.

Article Snippet: Human RCC cell lines 769-P, 786-O and SW839, human NSCLC cell lines A549, H1299 and the HEK-293T cell line were obtained from the American Type Culture Collection and cultured in RPMI-1640 or DMEM medium (Thermo Fisher Scientific, Inc.) added with 10% fetal bovine serum (FBS) (Thermo Fisher Scientific, Inc.),100 U/ml penicillin and 0.1 mg/ml streptomycin (Thermo Fisher Scientific, Inc.) at a temperature of 37 °C.

Techniques: Quantitative Proteomics, Western Blot, Transfection, Negative Control, Plasmid Preparation, Expressing, Produced, Knockdown, Software, Concentration Assay

Journal: Redox Biology

Article Title: USP20 governs tyrosine kinase inhibitors resistance through ferroptosis evasion by targeting GPX4 in cancers

doi: 10.1016/j.redox.2026.104086

Figure Lengend Snippet: USP20 deficiency sensitizes cancer cells to FINs. ( A-B ) shScr and shUSP20 769-P (A) and A549 (B) cells were treated with 20 μM IKE for 6 h, followed by quantification of lipid ROS with C11-BODIPY 581/591 probe. ( C-D ) shScr and shUSP20 769-P (C) and A549 (D) cells were treated with indicated concentration of IKE and 1 μM Fer-1 for 48 h Cell viability was measured via MTT assay. ( E ) 786-O cells, transfected with EV or USP20-overexpressing plasmid, were treated with indicated concentration of IKE and 1 μM Fer-1 for 48 h Cell viability was measured via MTT assay. ( F-G ) shScr and shUSP20 tumor cells were cultured for 10 days while treated with 10 μM IKE and 1 μM Fer-1, the colony number was measured with Image J. ( H–I ) 786-O cells, transfected with EV or USP20-overexpressing plasmid, were cultured for 10 days while treated with 10 μM IKE and 1 μM Fer-1, the colony number was measured with Image J. ( J-N ) shScr and shUSP20 769-P cells were planted in nude mouse. After the xenografts reached 100 mm 3 , mice were treated with IKE (100 mg/kg) and Fer-1 (5 mg/kg) every three days, tumor volume (J) was measure at indicated times, xenografts were weighted at the day 32(K-L). The expressions of USP20, GPX4 and 4-HNE in the xenograft tumors were detected by immunohistochemistry and analyzed via IHC score (N). (Scale bar, 100 μM). ( O–P ) EV and USP20-overexpressing 786-O cells were planted in nude mouse. After the xenografts reached 100 mm 3 , mice were treated with IKE (100 mg/kg) and Fer-1 (5 mg/kg) every three days, tumor volume (O) was measure at indicated times, xenografts were weighted at the day 32 (P). For A-I , data are presented as mean ± s.d. of n = 3 biological replicates. Data in J and O is presented as mean ± s.e.m., data in K, L and N is presented as mean ± s.d. n = 5 mice. shScr: shScramble. EV: empty vector. OE: USP20-overexpressing.

Article Snippet: Human RCC cell lines 769-P, 786-O and SW839, human NSCLC cell lines A549, H1299 and the HEK-293T cell line were obtained from the American Type Culture Collection and cultured in RPMI-1640 or DMEM medium (Thermo Fisher Scientific, Inc.) added with 10% fetal bovine serum (FBS) (Thermo Fisher Scientific, Inc.),100 U/ml penicillin and 0.1 mg/ml streptomycin (Thermo Fisher Scientific, Inc.) at a temperature of 37 °C.

Techniques: Concentration Assay, MTT Assay, Transfection, Plasmid Preparation, Cell Culture, Immunohistochemistry

Journal: Frontiers in Immunology

Article Title: Photochemical enhancement of PD-L1-SAP immunotoxin efficacy in non-small cell lung cancer cell lines

doi: 10.3389/fimmu.2026.1750003

Figure Lengend Snippet: Phototoxicity of TPCS 2a -PDT in PD-L1 high NCI-H1975 cells, (A) and PD-L1 low A549, (B) cell lines. Cell viability was assessed 48 h post light exposure (3 min = 1.8 J/cm²). Data represents mean ± SD of three independent experiments (n = 3).

Article Snippet: The human NSCLC cell lines NCI-H1975 (CRL-5908) and A549 (CCL-185) were obtained from the American Type Culture Collection (ATCC, USA).

Techniques:

Journal: Frontiers in Immunology

Article Title: Photochemical enhancement of PD-L1-SAP immunotoxin efficacy in non-small cell lung cancer cell lines

doi: 10.3389/fimmu.2026.1750003

Figure Lengend Snippet: Cytotoxicity of anti-PD-L1-SAP, BIgG-SAP, saporin, and atezolizumab in the absence of photosensitizer and light in two NSCLC cell lines. (A) NCI-H1975 cells and (B) A549 cells. In all experiments, cell viability was assessed after 48 h incubation. Data represents mean ± SD of three independent experiments (n = 3).

Article Snippet: The human NSCLC cell lines NCI-H1975 (CRL-5908) and A549 (CCL-185) were obtained from the American Type Culture Collection (ATCC, USA).

Techniques: Incubation

Journal: Frontiers in Immunology

Article Title: Photochemical enhancement of PD-L1-SAP immunotoxin efficacy in non-small cell lung cancer cell lines

doi: 10.3389/fimmu.2026.1750003

Figure Lengend Snippet: Cytotoxic effects of PCI of anti-human PD-L1-SAP in lung cancer cell lines. PCI and PDT Workflow I on (A) NCI-H1975 cells and (B) A549. PCI and PDT in NCI-H1975 (C) and A549 (D) cells using Workflow II. In all experiments, cell viability was assessed 48 h post irradiation (3 min = 1.8 J/cm²). Data represents mean ± SD of three independent experiments (n = 3). Exact p-values for all PCI experiments (PDT vs. PCI with anti-PD-L1-SAP) are shown in Supplementary Table 1 .

Article Snippet: The human NSCLC cell lines NCI-H1975 (CRL-5908) and A549 (CCL-185) were obtained from the American Type Culture Collection (ATCC, USA).

Techniques: Irradiation

Journal: Frontiers in Immunology

Article Title: Photochemical enhancement of PD-L1-SAP immunotoxin efficacy in non-small cell lung cancer cell lines

doi: 10.3389/fimmu.2026.1750003

Figure Lengend Snippet: Cell membrane binding and intracellular trafficking of anti-PD-L1-AlexaFluor647 in PD-L1 high NCI-H1975 cells. (A) Representative photomicrographs of selected time points are shown (for the remaining time points see Supplementary Figure 1 ). Red: anti-PD-L1-AlexaFluor647; green: plasma membrane; blue: LysoTracker blue (late endosomes and lysosomes), pink – merge of LysoTracker blue and anti-PD-L1-AlexaFluor647, yellow/orange – merge of plasma membrane and anti-PD-L1-AlexaFluor647. Scale bar 20 µm. (B, C) Quantification of anti-PD-L1-AlexaFluor647 colocalization with lysosomes and plasma membrane using Mander’s overlap coefficient (B) and Pearson’s correlation coefficient ( C ). The results are mean ± SD of three independent experiments.

Article Snippet: The human NSCLC cell lines NCI-H1975 (CRL-5908) and A549 (CCL-185) were obtained from the American Type Culture Collection (ATCC, USA).

Techniques: Membrane, Binding Assay, Clinical Proteomics

Journal: Frontiers in Immunology

Article Title: Photochemical enhancement of PD-L1-SAP immunotoxin efficacy in non-small cell lung cancer cell lines

doi: 10.3389/fimmu.2026.1750003

Figure Lengend Snippet: Flow cytometric quantification of PD-L1 uptake in NSCLC cell lines. PD-L1 expression levels were measured in NCI-H1975 (black bars) and A549 (grey bars) cells at the indicated time points using flow cytometry. Cells were stained with anti-PD-L1-Alexa647 antibody, and uptake was expressed as median fluorescence intensity (MFI) relative to unstained controls. The “18 + 4” condition refers to 18 hours of incubation followed by washout and an additional 4-hour chase in drug-free medium. Data represent mean ± SD from at least two independent experiments.

Article Snippet: The human NSCLC cell lines NCI-H1975 (CRL-5908) and A549 (CCL-185) were obtained from the American Type Culture Collection (ATCC, USA).

Techniques: Expressing, Flow Cytometry, Staining, Fluorescence, Incubation