ck2 inhibitors cx-4945  (Selleck Chemicals)

Journal: PLOS Biology

Article Title: Casein kinase 2-mediated phosphorylation of the splicing factor SF3B3 plays a key role in esophageal squamous cell carcinoma progression

doi: 10.1371/journal.pbio.3003729

Figure Lengend Snippet: (A) Kinase-substrate enrichment analysis (KSEA) was performed based on phosphoproteomic data in ESCC. Kinases are considered hyper-activated when enrichment score > 0 (red) and P < 0.05, while they are regarded as inhibited when the enrichment score < 0 (blue) and P < 0.05. (B) KEGG pathway enrichment analysis results are shown for differential phosphoproteins. Pathways enriched in the upregulated ( n = 1,038) and down-regulated ( n = 574) phosphoproteins are indicated by pink and blue bars, respectively. (C) Fold change (FC) in the abundance of phosphosites conforming to the CK2 consensus motif (S/T X X E/D) is shown (BH adjusted P value < 0.01) (D) The abundance of p-SF3B3 (T1200) in ESCC tumor (T) and adjacent normal (N) tissues ( n = 21). (E) Kaplan–Meier plots of Disease-Free Survival (DFS) in ESCC patients of p-SF3B3 (T1200). (F) The amino acid sequences surrounding T1200 in SF3B3 in different species are shown. The consensus motif for CK2 phosphorylation is shown at the bottom. (G) The specificity of p-SF3B3 (T1200) antibody was examined by using both wild-type (WT, EELDRTPPEVS) and p-T1200 (EELDRT(p)PPEVS) peptides. (H) Bacterially expressed, purified His-SF3B3 (WT) and His-SF3B3 (T1200A) proteins were examined by Coomassie blue staining (C.B.S) and indicated by the red arrow. (I) In vitro phosphorylation assay was performed by mixing bacterially expressed, purified His-SF3B3 (WT) or His-SF3B3 (T1200A) with or without CK2 kinase, followed by immunoblotting (IB) analysis using antibodies as indicated or Ponceau Staining (P.S). (J) KYSE140 cells treated with or without CX-4945 (10 μM, 24 h) were subjected to immunoprecipitation (IP) with anti-SF3B3 antibody, followed by IB analysis with antibodies as indicated. (K) HEK293T cells were transfected with GFP-tagged SF3B3 and then treated with or without CX-4945 (10 μM, 24 h), followed by IP analysis with anti-GFP antibody and IB analysis with antibodies as indicated. (L) KYSE140 cells were subjected to IP analysis with control IgG or anti-SF3B3 antibody, followed by IB analysis with antibodies as indicated. (M) HEK293T cells transfected with FLAG-tagged CSNK2A1 and GFP-tagged SF3B3 were subjected to IP analysis with anti-Flag M2 agarose, followed by IB analysis with antibodies as indicated. (N) HEK293T cells transfected with FLAG-tagged SF3B3 and MYC-tagged CSNK2A1 were subjected to IP analysis with anti-Flag M2 agarose, followed by IB analysis with antibodies as indicated. The data underlying the graphs shown can be found in .

Article Snippet: The proteasome inhibitor MG-132 (T2154), the CK2 inhibitor CX-4945 (T2259), and the USP7 inhibitor P5091 (T6925) were purchased from TargetMol.

Techniques: Phospho-proteomics, Purification, Staining, In Vitro, Western Blot, Immunoprecipitation, Transfection, Control

Journal: PLOS Biology

Article Title: Casein kinase 2-mediated phosphorylation of the splicing factor SF3B3 plays a key role in esophageal squamous cell carcinoma progression

doi: 10.1371/journal.pbio.3003729

Figure Lengend Snippet: (A) KYSE140 and KYSE30 cells were treated with CX-4945 for 0, 12, and 24 h (10 μM), followed by IB analysis with antibodies as indicated. (B) KYSE30 cells were treated with CX-4945 (10 μM) for 12 h and then treated with cycloheximide (CHX) (50 μg/ml) for 0, 4, 8, or 12 h, followed by IB analysis with antibodies as indicated. (C) The quantification of SF3B3 proteins in (B) is shown (mean ± SD; * P < 0.05, Student t test). (D) KYSE30 cells were infected with lentivirus expressing SF3B3 (WT), SF3B3 (T1200A), or SF3B3 (T1200D) for 48 h and then treated with CHX (50 μg/mL) for 0, 4, 8, or 12 hours, followed by IB analysis with antibodies as indicated. (E) The quantification of SF3B3 proteins in (D) is shown (mean ± SD; * P < 0.05, ** P < 0.01, Student t test). (F) The rela t ive expression of SF3B3 in ESCC tumor (T) and adjacent normal (N) tissues (n = 124) from CPPA database is shown. (G) Kaplan–Meier plots of overall survival of SF3B3 in ESCC patients using the CPPA dataset. (H) The correlation between the expression of SF3B3 and the abundance of p-SF3B3 (T1200) in ESCC clinical samples as described in is shown. (I) The correlation between PTMSEA score of CK2 and the expression of SF3B3 in ESCC clinical samples as described in is shown. The data underlying the graphs shown can be found in .

Article Snippet: The proteasome inhibitor MG-132 (T2154), the CK2 inhibitor CX-4945 (T2259), and the USP7 inhibitor P5091 (T6925) were purchased from TargetMol.

Techniques: Infection, Expressing

Journal: PLOS Biology

Article Title: Casein kinase 2-mediated phosphorylation of the splicing factor SF3B3 plays a key role in esophageal squamous cell carcinoma progression

doi: 10.1371/journal.pbio.3003729

Figure Lengend Snippet: (A) KYSE140 cells transfected with siCTL or two independent siSF3B3 (siSF3B3-1 and siSF3B3-2) were subjected to RT-qPCR analysis to assess mRNA expression levels of SF3B3 (mean ± SD; *** P < 0.001, Student t test). (B) RNA extracted from cells as described in (A) were subjected to library preparation and Nanopore sequencing, and the number of alternative splicing (AS) events regulated by SF3B3 is shown (|ΔPSI| ≥ 0.2 and FDR ≤ 0.05). Cassette Exons or Exon Skipping (ES); Intron Retain (IR); Alternative 5′ Splice Site (5′ ASS); Alternative 3′ Splice Site (3′ ASS). (C) The number of exon inclusion and skipping induced by SF3B3 is shown by pie chart. (D) The Pearson’s correlation was analyzed between the expression levels of SF3B3 and genes containing SF3B3-regulated cassette exons that are highly expressed in ESCC (Log 2 FC ≥ 2, P ≤ 0.01). Red dots indicate genes with r ≥ 0.3. (E) GO analysis results for genes with SF3B3-regulated cassette exons. The top 6 most enriched GO terms are shown. (F) Kaplan–Meier analyses of progression-free interval in ESCC patients using EXOSC2 cassette exon 4 as an input in the OncoSplicing dataset. (G) KYSE140 cells transfected with siCTL, siSF3B3-1, or siSF3B3-2 were subjected to standard PCR analysis to examine the expression of both the short and long isoforms of EXOSC2 as indicated at the bottom. Percentage spliced in (PSI) values were measured by Image J. The position of the cassette exon in EXOSC2 is as follows: EXOSC2 ( NM_001114122 , exon 4). DNA marker is indicated on the left. (H) KYSE140 cells were transfected with siCTL or siSF3B3 in the presence or absence of control vector, SF3B3 (WT), or SF3B3 (T1200A), followed by standard PCR analysis to examine the short and long isoforms of EXOSC2 as described in (G). (I) KYSE140 cells treated with or without CX-4945 (10 μM) were subjected to standard PCR analysis to examine the short and long isoforms of EXOSC2 as described in (G). (J) HEK293T cells transfected with GFP control vector or GFP-tagged SF3B3 (WT), SF3B3 (T1200A), or SF3B3 (T1200D) were subjected to IP analysis with anti-GFP magnetic beads, followed by IB analysis with antibodies as indicated. (K) HEK293T cells transfected with GFP control vector or GFP-tagged SF3B3 (WT), SF3B3 (T1200A), or SF3B3 (T1200D) were subjected to RIP analysis with anti-GFP magnetic beads, followed by RT-qPCR analysis to examine the binding of SF3B3 protein with genes as indicated (mean ± SD; *** P < 0.001, ** P < 0.01, Student t test) . (L–N) KYSE140 cells s t ably expressing control lentiviral vector, EXOSC2 long isoform (EXOSC2-L), or EXOSC2 short isoform (EXOSC2-S) were subjected to IB analysis (L), cell proliferation assay (M), and colony formation assay (N) (mean ± SD; ns: not significant, *** P < 0.001, Student t test). (O) The quantifica t ion of the crystal violet dye in (N) is shown (mean ± SD; ns: not significant, ** P < 0.01, *** P < 0.001, Student t test). (P–R) KYSE140 cells transfected with siCTL or siSF3B3, followed by infec t ion with lentivirus expressing control vector, EXOSC2-L, or EXOSC2-S were subjected to IB analysis (P), cell proliferation assay (Q), and colony formation assay (R) (mean ± SD; * P < 0.05, ** P < 0.01, Student t test). (S) The quantification of the number of colonies in (R) (mean ± SD; *** P < 0.001, Student t test). (T) KYSE140 cells infected with lentivirus expressing shCTL or shSF3B3 in the presence or absence of lentivirus expressing control vec t or, EXOSC2-L, or EXOSC2-S were injected into BALB/c nude mice for 4 weeks, and the tumors were collected and photographed. (U, V) The tumor volume (U) and weight (V) as shown in (T) (mean ± SD; * P < 0.05, ** P < 0.01, *** P < 0.001, Student t test). (W) The expression of the short and long isoforms of EXOSC2 were measured by standard PCR as described in (G) in paired ESCC and adjacent normal tissues ( n = 6). (X) The quantification of the PSI values in (W) (mean ± SD; * P < 0.05, Student t test). The data underlying the graphs shown can be found in .

Article Snippet: The proteasome inhibitor MG-132 (T2154), the CK2 inhibitor CX-4945 (T2259), and the USP7 inhibitor P5091 (T6925) were purchased from TargetMol.

Techniques: Transfection, Quantitative RT-PCR, Expressing, Nanopore Sequencing, Alternative Splicing, Marker, Control, Plasmid Preparation, Magnetic Beads, Binding Assay, Proliferation Assay, Colony Assay, Infection, Injection

Journal: PLOS Biology

Article Title: Casein kinase 2-mediated phosphorylation of the splicing factor SF3B3 plays a key role in esophageal squamous cell carcinoma progression

doi: 10.1371/journal.pbio.3003729

Figure Lengend Snippet: (A, B) KYSE140 cells were treated with CX-4945 (A) or P5091 (B) at concentrations as indicated for 72 h before cell viability measurement, and the IC50 is shown. (C, D, F, G) KYSE140 cells were treated with CX-4945 or P5091 at concentrations as indicated, followed by cell proliferation (C, F) and colony formation (D, G) assay (mean ± SD; *** P < 0.001, Student t test). (E, H) The quantification of the crystal violet dye in (D) (E) and (G) (H) is shown (mean ± SD; *** P < 0.001, Student t test). (I) An inhibitory dose-response matrix of CX-4945 and P5091 was conducted in KYSE140 cells. (J) Synergy heatmaps representing combination treatment with CX-4945 and P5091 for 3 days in KYSE140. Red color denotes drug synergy. HSA: Highest Single Agent. (K, L) KYSE140 cells were treated with CX4945 (10 μM) or P5091 (20 μM) alone or in combination followed by cell proliferation (K) and colony formation (L) assay (mean ± SD, *** P < 0.001, Student t test). (M) The quan t ification of the crystal violet dye in (L) is shown (mean ± SD, *** P < 0.001, Student t test). (N, O) KYSE140 cells were trea t ed with CX4945 (10 μM) or P5091 (20 μM) alone or in combination followed by IB analysis (N) to examine the protein levels of SF3B3 and standard PCR analysis (O) to examine the alternative splicing of EXOSC2. (P) Male BALB/c nude mice were subcutaneously injected with KYSE30 cells for 20 days and then randomized (3 mice/group) and treated with CX4945 (25 mg/kg) or P5091 (25 mg/kg) alone or in combination as indicated by intraperitoneal (i.p.) injection daily before tumor collection. (Q) Images of excised tumors in (P) are shown. (R, S) The tumor growth curve (R) and tumor weight (S) as described in (P) are shown (mean ± SD; * P < 0.05, ** P < 0.01, *** P < 0.001, Student t test). The data underlying the graphs shown can be found in .

Article Snippet: The proteasome inhibitor MG-132 (T2154), the CK2 inhibitor CX-4945 (T2259), and the USP7 inhibitor P5091 (T6925) were purchased from TargetMol.

Techniques: Alternative Splicing, Injection

Journal: PLOS Biology

Article Title: Casein kinase 2-mediated phosphorylation of the splicing factor SF3B3 plays a key role in esophageal squamous cell carcinoma progression

doi: 10.1371/journal.pbio.3003729

Figure Lengend Snippet: In ESCC, aberrantly activated CK2 phosphorylates SF3B3 at Thr1200, enhancing its interaction with the deubiquitinase USP7. This interaction leads to deubiquitination and stabilization of SF3B3, ultimately promoting a large cohort of alternative splicing events, including the inclusion of exon 4 in EXOSC2, and thereby driving ESCC progression. Targeting both CK2 and USP7, either individually or in combination, using CX-4945 and P5091, respectively, effectively suppresses ESCC progression.

Article Snippet: The proteasome inhibitor MG-132 (T2154), the CK2 inhibitor CX-4945 (T2259), and the USP7 inhibitor P5091 (T6925) were purchased from TargetMol.

Techniques: Alternative Splicing

Journal: Islets

Article Title: CK2 regulates somatostatin expression in pancreatic delta cells

doi: 10.1080/19382014.2025.2515332

Figure Lengend Snippet: Expression of CK2 in RIN14B cells. (A) bright field images showing the morphology of RIN14B cells (scale bar in left panel: 800 µm; scale bar in right panel: 200 µm). (B) Representative Western blots of β-actin, PDX1, CK2α, CK2β expression in whole cell extracts of RIN14B cells. (C) Representative immunofluorescence stainings of CK2α (green, upper panel) and PDX1 (green, lower panel) in RIN14B cells. Cell nuclei were stained with Hoechst 33,342 (blue). Scale bar: 50 µm.

Article Snippet: The CK2 inhibitors CX-4945 and SGC (SGC-CK2-1) were purchased from SelleckChem (Munich, Germany).

Techniques: Expressing, Western Blot, Immunofluorescence, Staining

Journal: Islets

Article Title: CK2 regulates somatostatin expression in pancreatic delta cells

doi: 10.1080/19382014.2025.2515332

Figure Lengend Snippet: CK2 inhibition does not affect viability and SST expression in RIN14B cells. (A) Representative Western blots of Akt, pAkt, β-actin, CK2α and CK2β expression in whole cell extracts of RIN14B cells exposed to CX-4945, SGC or vehicle for 24 h. (B and C) RIN14B cells were treated as described in (A) and the viability was analyzed by a WST-1 assay (B) and LDH assay (C). Data are expressed in % of vehicle ( n = 3 each). Mean ± SD. (D) Quantitative analysis of SST mRNA expression in RIN14B cells treated as described in (A). Data are expressed in % of vehicle ( n = 3 each). Mean ± SD. (E) Representative immunofluorescence stainings of RIN14B cells overexpressing FLAG-tagged PDX1-WT. FLAG-Tag (red, upper left panel) and PDX1 (green, upper right panel) in RIN14B cells. Cell nuclei were stained with Hoechst 33,342 (blue). Scale bar: 25 µm. (F) Quantitative analysis of SST mRNA expression in RIN14B cells overexpressing FLAG-tagged PDX1-WT or control vector (mock). Data are expressed in % of mock ( n = 3 each). Mean ± SD.

Article Snippet: The CK2 inhibitors CX-4945 and SGC (SGC-CK2-1) were purchased from SelleckChem (Munich, Germany).

Techniques: Inhibition, Expressing, Western Blot, WST-1 Assay, Lactate Dehydrogenase Assay, Immunofluorescence, FLAG-tag, Staining, Control, Plasmid Preparation

Journal: Islets

Article Title: CK2 regulates somatostatin expression in pancreatic delta cells

doi: 10.1080/19382014.2025.2515332

Figure Lengend Snippet: CK2 inhibition increases SST expression and secretion in murine isolated islets. (A) Schematic illustration of the experimental setting: islets were isolated from mice and exposed to CX-4945, SGC or vehicle for 24 h. Subsequently, the islets were collected and prepared for protein expression and secretion analyses. (B) Representative immunofluorescence stainings of CK2α (green) and SST (red) in isolated murine islets. Cell nuclei were stained with Hoechst 33,342 (blue). Scale bar: 100 µm. (C) Isolated murine islets were treated as described in (A) and the number of SST-positive cells was determined in % of vehicle-treated islets. Mean ± SD. (D) Representative Western blots of Akt, pAkt and β-actin in whole cell extracts of murine islets treated as described in (A). (E) Murine islets were treated as described in (A) and SST mRNA expression was assessed. Data are expressed in % of vehicle ( n = 3 each). Mean ± SD. * p < 0.05. (F) Murine islets were treated as described in (A) and SST secretion was quantitatively analyzed (ng/mL) ( n = 3 each). Mean ± SD. * p < 0.05.

Article Snippet: The CK2 inhibitors CX-4945 and SGC (SGC-CK2-1) were purchased from SelleckChem (Munich, Germany).

Techniques: Inhibition, Expressing, Isolation, Immunofluorescence, Staining, Western Blot

Journal: Islets

Article Title: CK2 regulates somatostatin expression in pancreatic delta cells

doi: 10.1080/19382014.2025.2515332

Figure Lengend Snippet: CK2 inhibition increases SST expression under physiological conditions. (A) Schematic illustration of the experimental setting: mice were treated with CX-4945 or vehicle. After 3 d, the mice were euthanized and islets as well as plasma were isolated to study SST gene expression, insulin and glucagon plasma levels. (B and C) Quantitative analysis of plasma insulin levels (pmol/L) and plasma glucagon levels (ng/L) of mice treated as described in (A) ( n = 3 each). Mean ± SD. * p < 0.05. (D) SST mRNA expression of isolated islets from mice treated as described in (A). Data are expressed in % of vehicle ( n = 3 each). Mean ± SD. * p < 0.05. (E) Schematic illustration of the experimental setting: islets were isolated from pancreata of human donors. The islets were then exposed to CX-4945, SGC or vehicle and the subsequent SST secretion was assessed. (F) Human islets were treated as described in (E) and SST secretion was quantitatively analyzed (ng/mL) ( n = 2 each). Mean ± SD.

Article Snippet: The CK2 inhibitors CX-4945 and SGC (SGC-CK2-1) were purchased from SelleckChem (Munich, Germany).

Techniques: Inhibition, Expressing, Clinical Proteomics, Isolation, Gene Expression