skbr3 htb 30 cells  (ATCC)

Journal: Nature Communications

Article Title: Cysteine availability tunes ubiquitin signaling via inverse stability of LRRC58 E3 ligase and its substrate CDO1

doi: 10.1038/s41467-026-72524-3

Figure Lengend Snippet: a Volcano plot presenting RNA-seq analysis of HEK293T cells cultured for 24 h in complete or cysteine-free media ( n = 3 independent replicates). Differential expression was assessed using DESeq2 by fitting gene-wise negative binomial generalized linear models; statistical significance was evaluated using two-sided Wald tests, with p -values adjusted for multiple testing using the Benjamini-Hochberg procedure (adj. p ≤ 0.01). LRRC58 transcript levels show no significant change. Dashed lines indicate thresholds at 2-fold change and p -value = 0.05. b Average LRRC58 intensities in HEK293T proteomes ( n = 4 independent replicates) after 24 h treatment with proteasome (MG132) or neddylation inhibitors (MLN4924) in complete or cysteine-free media. c Average intensities of proteins identified in HEK293T proteomes ( n = 4 independent replicates), which were detectable when cultured in 10-fold excess cysteine but undetectable in cysteine-free media. d Average intensities of LRRC58 and CDO1 in HEK293T proteomes after 24 h culture in cysteine-free media, complete media (control), or with 10-fold excess cysteine ( n = 4 independent replicates). CDO1 was undetectable after culture in cysteine-free media; LRRC58 was undetectable in the control. e Average IPTM and PEAK scores from HT-Colabfold analysis of interactions between LRRC58-EloB/C and all proteins absent in cysteine starvation proteomes, but detected with 10-fold excess cysteine for the cell lines; HEK293T, HepG2, Jurkat, HeLa, and SKBR3. f Western blot analysis of CDO1 levels in WT-HEK293T and LRRC58 CRISPR-Cas9 knockout (KO) lysates after 24 h culture in cysteine-free media. g Average intensities of LRRC58 and CDO1 in WT-HEK293T and LRRC58-KO proteomes after 24 h culture in cysteine-free media ( n = 4 independent replicates). LRRC58-KO is confirmed by the absence of LRRC58; CDO1 is detectable only in KO. h WT-HEK293T and LRRC58-KO cells were transiently transfected with Flag-LRRC58 (WT, or A266F variant (disrupts EloB/C binding)). Western blot of CDO1 levels 24 h post-transfection, followed by 24 h culture in cysteine-free or complete media. All blots are representative of n = 2 technical replicates. Flag and vinculin serve as transfection and loading controls, respectively. All error bars report standard deviation. Purple and orange asterisks indicate samples where LRRC58 or CDO1, respectively, were undetectable. Source data provided as Source Data file.

Article Snippet: Jurkat (TIB-152), HepG2 (HB-8065), and SKBR3 (HTB-30) cells were purchased from the American Type Culture Collection (ATCC).

Techniques: RNA Sequencing, Cell Culture, Quantitative Proteomics, Control, Western Blot, CRISPR, Knock-Out, Transfection, Variant Assay, Binding Assay, Standard Deviation

Journal: International Journal of Molecular Medicine

Article Title: Ebastine targets HER2/HER3 signaling and cancer stem cell traits to overcome trastuzumab resistance in HER2-positive breast cancer

doi: 10.3892/ijmm.2026.5751

Figure Lengend Snippet: EBA impairs cancer stem cell-like properties. (A) BT474 and SKBR3 cells were treated with EBA for 48 h, and ALDH1 activity was assessed by flow cytometry using the Aldefluor assay. DEAB was used to define the baseline of Aldefluor-positive fluorescence. (B) BT474 cells (5x10 4 cells/ml) were plated in ultra-low attachment dishes and cultured in the presence or absence of EBA for 5 days. The number and volume of mammospheres were measured by microscopy. (C) Overall survival of patients with breast cancer stratified by the co-expression of ALDH1A1 and CD44. (D) Spearman correlation analysis of ALDH1A1 and CD44 mRNA levels in patients with HER2-positive breast cancer from The Cancer Genome Atlas cohort (n=76). Kaplan-Meier survival analyses of patients with HER2-overexpressing breast cancer stratified by (E) ALDH1A1 and (F) CD44 expression. Patients were divided into high- and low-expression groups based on the median gene expression. Statistical significance was determined using the log-rank test. (G) JIMT-1 cells were treated with EBA (3 μ M) for 48 h and the CD44 high /CD24 low cell populations were identified by flow cytometry. (H) JIMT-1 cells (1.5x10 4 cells/ml) were cultured under serum-free suspension conditions in the presence of EBA (3 μ M) for 8 days. Mammosphere number and volumes were quantified. ** P<0.01 and **** P<0.0001 vs. vehicle-treated control (0 μ M EBA). EBA, ebastine; ALDH, aldehyde dehydrogenase; DEAB, diethylaminobenzaldehyde; CTL, control; ISO, isotype.

Article Snippet: The human breast cancer cell lines SKBR3, BT474, MDA-MB-453 (American Type Culture Collection) and JIMT-1 (Leibnitz Institute DSMZ-German Collection of Microorganisms and Cell Cultures GmbH) were cultured in DMEM, MEM or RPMI-1640 (all Sigma-Aldrich; Merck KGaA) supplemented with 10% FBS (Gibco; Thermo Fisher Scientific, Inc.) and 100 U/ml penicillin-streptomycin at 37°C in a humidified atmosphere of 5% CO 2 .

Techniques: Activity Assay, Flow Cytometry, Fluorescence, Cell Culture, Microscopy, Expressing, Gene Expression, Suspension, Control