Journal: International Journal of Molecular Sciences

Article Title: Hydrogen Mitigated Doxorubicin-Induced Liver Injury via Nrf2/HO-1 Pathway Activation

doi: 10.3390/ijms27062774

Figure Lengend Snippet: Hydrogen activated the Nrf2/HO-1 pathway to attenuate liver injury in DOX mice. ( A , B ) Nfe2l2 and Hmox1 gene expression in liver tissue (n = 3). ( C – E ) IHC staining and statistics of Nrf2 and HO-1 protein (scale bar = 100 µm, n = 3). ( F – I ) Expression and statistics of Keap1, Nrf2, and HO-1 protein levels measured by Western blot (n = 4). The results are presented as the mean ± SEM. * p < 0.05 vs. Con group. # p < 0.05 vs. DOX group.

Article Snippet: Antibodies: Bcl-2 ( GB153375 , Servicebio, Wuhan, China), Bax (GB11007, Servicebio, Wuhan, China), Caspase 3 (#14220, Cell Signaling Technology, Danvers, MA, USA), MDA (ab243066, Abcam, Cincinnati, OH, USA), 4-HNE ( ARG23717 , Arigo Biolaboratories, Hsinchu, Taiwan), IL-6 (DF6087, Affinity, Cincinnati, OH, USA), NLRP3 (BA3677, Boster, Wuhan, China), Nrf2 ( GB115673 , Servicebio, Wuhan, China), HO-1 (GB12104, Servicebio, Wuhan, China), Keap1 (bs-4900R, BIOSS, Shanghai, China), and α-Tubulin (GB11200, Servicebio, Wuhan, China).

Techniques: Gene Expression, Immunohistochemistry, Expressing, Western Blot

Journal: International Journal of Molecular Sciences

Article Title: Hydrogen Mitigated Doxorubicin-Induced Liver Injury via Nrf2/HO-1 Pathway Activation

doi: 10.3390/ijms27062774

Figure Lengend Snippet: The schematic diagram of hydrogen protection against DOX-induced liver injury. DOX has been observed to provoke biochemical alterations and pathological abnormalities in the liver. Specifically, DOX facilitates the generation of ROS and promotes mitochondria-dependent cell apoptosis. Additionally, DOX impedes the reduction in the expression of Keap1 and Nrf2, thereby inhibiting the downstream antioxidant signaling pathways of Nrf2, including HO-1, CAT, and T-SOD. Concurrently, it enhances the expression of lipid peroxidation products such as MDA and 4-HNE. Furthermore, DOX instigates inflammatory processes and augments the release of pro-inflammatory cytokines. In contrast, hydrogen exerts a protective effect on DOX-induced liver dysfunction by modulating Nrf2, which mitigates oxidative stress and inflammatory responses.

Article Snippet: Antibodies: Bcl-2 ( GB153375 , Servicebio, Wuhan, China), Bax (GB11007, Servicebio, Wuhan, China), Caspase 3 (#14220, Cell Signaling Technology, Danvers, MA, USA), MDA (ab243066, Abcam, Cincinnati, OH, USA), 4-HNE ( ARG23717 , Arigo Biolaboratories, Hsinchu, Taiwan), IL-6 (DF6087, Affinity, Cincinnati, OH, USA), NLRP3 (BA3677, Boster, Wuhan, China), Nrf2 ( GB115673 , Servicebio, Wuhan, China), HO-1 (GB12104, Servicebio, Wuhan, China), Keap1 (bs-4900R, BIOSS, Shanghai, China), and α-Tubulin (GB11200, Servicebio, Wuhan, China).

Techniques: Expressing, Protein-Protein interactions

Journal: Journal of Pharmaceutical Analysis

Article Title: Caffeic acid alleviates myocardial ischemia-reperfusion injury by directly targeting Keap1 N532/M550 and promoting its degradation

doi: 10.1016/j.jpha.2025.101219

Figure Lengend Snippet: Caffeic acid (CA) activate kelch-like ECH-associated protein 1/nuclear factor erythroid 2 related factor 2 (Keap1/Nrf2) signaling pathway. (A–E) Western blot and gray value analysis of Keap1 protein expression. (F) Western blot and gray value analysis of Nrf2 protein expression in the nucleus and cytoplasm. (G, H) Representative images of immunofluorescence staining of Keap1 (Green) and Nrf2 (Red). (I) Western blot and gray value analysis of heme oxygenase-1 (HO-1) and nicotinamide adenine dinucleotide phosphate (NADPH) dehydrogenase quinone 1 (NQO1) protein expression. The results were normalized and are expressed as the mean ± standard deviation (SD) ( n = 3). ∗ P < 0.05, ∗∗ P < 0.01, ∗∗∗ P < 0.001, compared to the control group. GAPDH: glyceraldehyde-3-phosphate dehydrogenase; DAPI: 4′,6-diamidino-2′-phenylindole.

Article Snippet: Interaction analysis of caffeic acid (CA) analogs with kelch-like ECH-associated protein 1 (Keap1) Kelch . (A–D) The affinity of Keap1 Kelch binding with different components was detected by Biacore. (A) CGA with Keap1 Kelch , (B) CA-derivative with Keap1 Kelch , (C) Protocatechuic acid with Keap1 Kelch , D) Gallic acid with Keap1 Kelch . (E-H) The CA analogs and Keap1 Kelch interaction diagram. (E) Molecular docking of CGA with Keap1 Kelch , (F) Molecular docking of CA-derivative with Keap1 Kelch , (G) Molecular docking of protocatechuic acid with Keap1 Kelch , (H) Molecular docking of gallic acid with Keap1 Kelch , This figure is exported from the Ligplot software.

Techniques: Western Blot, Expressing, Immunofluorescence, Staining, Standard Deviation, Control

Journal: Journal of Pharmaceutical Analysis

Article Title: Caffeic acid alleviates myocardial ischemia-reperfusion injury by directly targeting Keap1 N532/M550 and promoting its degradation

doi: 10.1016/j.jpha.2025.101219

Figure Lengend Snippet: Caffeic acid (CA) induced kelch-like ECH-associated protein 1 (Keap1) degradation via p62-dependent autophagy. (A) Western blot and gray value analysis of Keap1 and p62 protein expression. (B) Immunofluorescence staining of p62 (Red) was analyzed by treating cells with different doses of CA. (C–E) Western blot and gray value analysis of Keap1 and LC3B-II protein expression were conducted both with and without the addition of MG132. (F–H) Western blot and gray value analysis of Keap1 and LC3B-II protein expression were conducted both with and without the addition of CQ (I) The LC3B-II (Red) expression level was detected by immunofluorescence analysis. The results were normalized and are expressed as the mean ± standard deviation (SD) ( n = 3). ∗ P < 0.05, ∗∗ P < 0.01, ∗∗∗ P < 0.001, compared to the control group. DAPI: 4′,6-diamidino-2′-phenylindole; CQ: chloroquin.

Article Snippet: Interaction analysis of caffeic acid (CA) analogs with kelch-like ECH-associated protein 1 (Keap1) Kelch . (A–D) The affinity of Keap1 Kelch binding with different components was detected by Biacore. (A) CGA with Keap1 Kelch , (B) CA-derivative with Keap1 Kelch , (C) Protocatechuic acid with Keap1 Kelch , D) Gallic acid with Keap1 Kelch . (E-H) The CA analogs and Keap1 Kelch interaction diagram. (E) Molecular docking of CGA with Keap1 Kelch , (F) Molecular docking of CA-derivative with Keap1 Kelch , (G) Molecular docking of protocatechuic acid with Keap1 Kelch , (H) Molecular docking of gallic acid with Keap1 Kelch , This figure is exported from the Ligplot software.

Techniques: Western Blot, Expressing, Immunofluorescence, Staining, Standard Deviation, Control

Journal: Journal of Pharmaceutical Analysis

Article Title: Caffeic acid alleviates myocardial ischemia-reperfusion injury by directly targeting Keap1 N532/M550 and promoting its degradation

doi: 10.1016/j.jpha.2025.101219

Figure Lengend Snippet: Caffeic acid (CA) directly interacts with kelch-like ECH-associated protein 1 (Keap1) in vit r o . (A) Structure of CA and photo-affinity labeling probe (PAL-CA). (B) PAL-CA probe target fishing flowchart. (C) Silver staining of the PAL-CA complex in H9c2 cells. (D) Validation of Keap1 pulled down from mitochondria of the H9c2 cells with PAL-CA by Western blot. (E) Cellular thermal shift assay (CETSA) experiments of CA with Keap1 protein. (F) Size-exclusion chromatography analysis. The black and red lines represent the ultraviolet absorption of the standard and Keap1 proteins at 280 nM, respectively. (G) Surface plasmon resonance (SPR) experiments of CA with Keap1 protein. (H) Chemical structure of CA (top) and isothermal titration calorimetry (ITC) experiments (bottom). (I, J) SDS-PAGE gel and line graph were used to analyze the in vitro digestive stability of Keap1 under the action of trypsin.. (K) Native mass spectrometry analysis of apo Keap1. The Keap1 protein exists as monomers, dimers, and hexamers in solution (top). Enlarged view of the Keap1 protein dimer, including the P 1 and P 2 peaks (bottom). (L) Native mass spectrometry analysis of Keap1 with CA. After CA binds to the Keap1 protein, the monomers, dimers and hexamers exist in solution (top). Enlarged view of the increased dimerization that occurs after CA binds to the Keap1 protein (P 1 and P 2 peaks) (bottom). The results were normalized and are expressed as the mean ± standard deviation (SD) ( n = 3). DMSO: dimethyl sulfoxide.

Article Snippet: Interaction analysis of caffeic acid (CA) analogs with kelch-like ECH-associated protein 1 (Keap1) Kelch . (A–D) The affinity of Keap1 Kelch binding with different components was detected by Biacore. (A) CGA with Keap1 Kelch , (B) CA-derivative with Keap1 Kelch , (C) Protocatechuic acid with Keap1 Kelch , D) Gallic acid with Keap1 Kelch . (E-H) The CA analogs and Keap1 Kelch interaction diagram. (E) Molecular docking of CGA with Keap1 Kelch , (F) Molecular docking of CA-derivative with Keap1 Kelch , (G) Molecular docking of protocatechuic acid with Keap1 Kelch , (H) Molecular docking of gallic acid with Keap1 Kelch , This figure is exported from the Ligplot software.

Techniques: Labeling, Silver Staining, Biomarker Discovery, Western Blot, Thermal Shift Assay, Size-exclusion Chromatography, SPR Assay, Isothermal Titration Calorimetry, SDS Page, In Vitro, Mass Spectrometry, Standard Deviation

Journal: Journal of Pharmaceutical Analysis

Article Title: Caffeic acid alleviates myocardial ischemia-reperfusion injury by directly targeting Keap1 N532/M550 and promoting its degradation

doi: 10.1016/j.jpha.2025.101219

Figure Lengend Snippet: The complexed crystal structure confirms the interaction sites of caffeic acid (CA) with kelch-like ECH-associated protein 1 (Keap1). (A) Schematic design of the experiments. (B) Gel filtration traces of Keap1 and Keap1 gel filtered with CA with a Superdex 200 10/300 Increase column and superimposed on the chromatogram of two standard protein markers (75 kDa and 44 kDa). (C) Kelch crystal diagram. (D) The overall structure of the complex of the Kelch domain with CA. Two orthogonal views are shown. (E) The CA molecule and surrounding residues responsible for its binding are shown in ball-and-stick representation. The M550 and N532 residues of the Kelch domain interact with CA. (F) Isothermal titration calorimetry (ITC) experiments of N532A with Keap1. (G) Comparison of the mouse Kelch domain (PDB ID: 1X2J ) and the Kelch domain bound to CA (PDB ID: 7YEN ). The Kelch apo and Kelch-CA complexes are colored wheat and purple, respectively. (H) Protein-ligand complex structure of molecular dynamics (MD) simulations for wild type 5 ns (a), wild type 100 ns (b), N532A mutant (c), and M550A mutant (d) of Keap1 kelch domain. The ligand CA is shown as yellow sticks. (I) Multiple sequence alignment of Keap1 from different species. The red background represents extremely conserved residues, and the red font represents relatively conserved residues. H. sapiens : Homo sapiens; M. musculus : Mus musculus ; C. toad : Caucasian toad ; D. rerio : Danio rerio .DP: ?.

Article Snippet: Interaction analysis of caffeic acid (CA) analogs with kelch-like ECH-associated protein 1 (Keap1) Kelch . (A–D) The affinity of Keap1 Kelch binding with different components was detected by Biacore. (A) CGA with Keap1 Kelch , (B) CA-derivative with Keap1 Kelch , (C) Protocatechuic acid with Keap1 Kelch , D) Gallic acid with Keap1 Kelch . (E-H) The CA analogs and Keap1 Kelch interaction diagram. (E) Molecular docking of CGA with Keap1 Kelch , (F) Molecular docking of CA-derivative with Keap1 Kelch , (G) Molecular docking of protocatechuic acid with Keap1 Kelch , (H) Molecular docking of gallic acid with Keap1 Kelch , This figure is exported from the Ligplot software.

Techniques: Filtration, Binding Assay, Isothermal Titration Calorimetry, Comparison, Mutagenesis, Sequencing

Journal: Journal of Pharmaceutical Analysis

Article Title: Caffeic acid alleviates myocardial ischemia-reperfusion injury by directly targeting Keap1 N532/M550 and promoting its degradation

doi: 10.1016/j.jpha.2025.101219

Figure Lengend Snippet: Interaction analysis of caffeic acid (CA) analogs with kelch-like ECH-associated protein 1 (Keap1) Kelch . (A–D) The affinity of Keap1 Kelch binding with different components was detected by Biacore. (A) CGA with Keap1 Kelch , (B) CA-derivative with Keap1 Kelch , (C) Protocatechuic acid with Keap1 Kelch , D) Gallic acid with Keap1 Kelch . (E-H) The CA analogs and Keap1 Kelch interaction diagram. (E) Molecular docking of CGA with Keap1 Kelch , (F) Molecular docking of CA-derivative with Keap1 Kelch , (G) Molecular docking of protocatechuic acid with Keap1 Kelch , (H) Molecular docking of gallic acid with Keap1 Kelch , This figure is exported from the Ligplot software. Hydrogen bonds are shown as green dotted lines, while the spoked arcs represent residues making nonbonded contacts with the ligand. (I) 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assays of the toxic effects of chlorogenic acid (CGA) on H 2 O 2 -treated H9c2 cells. ∗ P < 0.05, ∗∗ P < 0.01, ∗∗∗ P < 0.001, compared to H 2 O 2 group. (J) Western blot and gray value analysis of Keap1 protein expression after treated with different concentrations of CGA. (K) Western blot and gray value analysis of Keap1 protein expression treated with different times of CGA. (L) Western blot and gray value analysis of Keap1 protein expression treated with different concentrations of 60 μM CGA. The results are expressed as the mean ± standard deviation (SD) ( n = 3). ∗ P < 0.05, ∗∗ P < 0.01, ∗∗∗ P < 0.001, compared to the control group.

Article Snippet: Interaction analysis of caffeic acid (CA) analogs with kelch-like ECH-associated protein 1 (Keap1) Kelch . (A–D) The affinity of Keap1 Kelch binding with different components was detected by Biacore. (A) CGA with Keap1 Kelch , (B) CA-derivative with Keap1 Kelch , (C) Protocatechuic acid with Keap1 Kelch , D) Gallic acid with Keap1 Kelch . (E-H) The CA analogs and Keap1 Kelch interaction diagram. (E) Molecular docking of CGA with Keap1 Kelch , (F) Molecular docking of CA-derivative with Keap1 Kelch , (G) Molecular docking of protocatechuic acid with Keap1 Kelch , (H) Molecular docking of gallic acid with Keap1 Kelch , This figure is exported from the Ligplot software.

Techniques: Binding Assay, Software, Western Blot, Expressing, Standard Deviation, Control

Journal: FASEB bioAdvances

Article Title: Bicaudal D1 impairs autophagosome maturation in chronic obstructive pulmonary disease.

doi: 10.1096/fba.2018-00055

Figure Lengend Snippet: FIGURE 5 CSE induces p62 oligomers via their Keap1 interaction region (KIR). (A) BEAS‐2B cells were incubated with HC‐CSE for 24 hours and p62 was immunoprecipitated (IP) from whole‐cell extracts. IP‐p62 species were resolved by SDS‐PAGE followed by Western blot (WB) and membranes immune‐stained against ubiquitin (Ub), LC3, and p62. IgG control (no whole‐cell lysates used). (B) Molecular weight characterization of p62 oligomers. HEK293 cells were transfected with p62‐FLAG and incubated with HC‐CSE for 24 h. Whole‐cell extracts were resolved by WB and immune‐stained against FLAG. A molecular marker for high molecular weights (MW) was used. A graph extrapolating distance of bands from origin and MW determined the expected size of p62 oligomers and the possible combinations. (C) Deubiquitination assay of IP‐p62. BEAS‐2B cells were prepared as indicated in (A). Samples were divided by two and p62 was IP. IP‐p62 beads were incubated in deubiquitin buffer plus/minus Ubiquitin specific peptidase 2 (USP2). (D) Schematic representation of p62 functional domains: PB1, ZZ (ZZ‐type zinc finger domain), LIR, KIR, and UBA and schematic representation of the different deletion p62 mutants used in (E). (E) HEK293 cells were transfected with either WT p62‐GFP, or the following p62‐GFP deletion plasmids: ∆123‐170, ∆170‐256, ∆256‐370, ∆346‐385, and ∆UBA (∆386‐440) and incubated with HC‐CSE for another 24 h. WB was performed and membranes were immune‐stained using anti‐GFP and β‐actin. (F) BEAS‐2B cells were transfected with siRNA for Keap1 or a random oligonucleotide control (NC) and incubated with LC‐ and HC‐CSE for a further 24 h. WB was performed and membranes were immune‐stained using against p62, LC3, Keap1, and β‐actin. (G) HEK293 cells were transfected with either WT p62‐GFP or a KIR deletion p62‐GFP plasmid and incubated with HC‐CSE for another 24 h. WB was performed and membranes were immune‐stained using anti‐GFP and β‐actin. Data are representative of at least two independent experiments

Article Snippet: Keap1 (mouse monoclonal; #TA502059) and FLAG (mouse monoclonal; #TA50011‐100) from Origene).

Techniques: Incubation, Immunoprecipitation, SDS Page, Western Blot, Staining, Ubiquitin Proteomics, Control, Molecular Weight, Transfection, Marker, Functional Assay, Plasmid Preparation