Journal: Hepatology Communications

Article Title: Myeloid Endoplasmic Reticulum Resident Chaperone GP96 Facilitates Inflammation and Steatosis in Alcohol‐Associated Liver Disease

doi: 10.1002/hep4.1713

Figure Lengend Snippet: HSP90B1 and HSPA5 genes and GP96 are induced in ALD. (A) mRNA abundance of HSP90B1 and HSPA5 genes (in transcripts per million) was evaluated by RNA sequencing in patients with normal liver (n = 10), early ASH (n = 12), severe_AH (n = 17), explants_AH (n = 10), and livers from NAFLD (n = 10), HCV (n = 10), and comp_Cirrhosis (n = 9). (B) Representative immunohistochemistry of GP96 in human normal and alcoholic liver (magnification × 200). WT mice were fed with control liquid diet (pair‐fed) or diet containing 5% alcohol for 4 weeks. The mRNA expression of GP96 and GRP78 was measured by RT‐PCR in livers (C) and isolated hepatocytes (E) and liver macrophages (n = 4‐10). (D) Protein level of GP96 and GRP78 in liver lysate was analyzed by western blotting (n = 6). (F) BMDMs were treated with 25 mM ethanol and mRNA expression of GP96 and GRP78 (n = 6). (G) The protein level of GP96 was analyzed at different time intervals (n = 3). Data are represented as mean ± SEM. * P < 0.05, ** P < 0.01, *** P < 0.001, **** P < 0.0001. Abbreviations: EtOH, alcohol; comp, compensated; tpm, transcripts per million.

Article Snippet: Antibodies used were GP96 (SMC‐105; StressMarq Biosciences, Cadboro, Canada), GRP78 (CST‐3183; Cell Signaling Technology), peroxisome proliferator‐activated receptor alpha (PPAR‐α) (sc‐9000; Santa Cruz Biotechnology, Dallas, TX), CyP2e1 (AB1252; MilliporeSigma, Burlington, MA), calnexin (ab2295; Abcam, Cambridge, United Kingdom), C/EBP‐homologous protein (CHOP) (sc‐7351; Santa Cruz Biotechnology), ATF6α (sc‐166659; Santa Cruz Biotechnology), ATF4 (10835‐1‐AP; Proteintech, Rosemont, IL), ATF3 (sc‐81189; Santa Cruz Biotechnology), β‐actin (ab6276; Abcam), tubulin (ab6046; Abcam), and TATA‐box protein (TBP) (ab818, Abcam).

Techniques: RNA Sequencing Assay, Immunohistochemistry, Expressing, Reverse Transcription Polymerase Chain Reaction, Isolation, Western Blot

Journal: Hepatology Communications

Article Title: Myeloid Endoplasmic Reticulum Resident Chaperone GP96 Facilitates Inflammation and Steatosis in Alcohol‐Associated Liver Disease

doi: 10.1002/hep4.1713

Figure Lengend Snippet: Myeloid‐specific GP96 deficiency alleviates chronic alcohol‐induced liver injury. Female WT and M‐GP96KO mice were fed with isocaloric control liquid diet (pair‐fed) or 5% alcohol‐containing Leiber‐DeCarli diet (alcohol‐fed) for 4 weeks, and liver‐to–body weight ratio (A), serum levels of ALT (n = 10‐16) (B), and liver triglycerides (C) were analyzed. Representative photomicrographs of hepatic injury and steatosis assessed by H&E (D) and Oil Red O (E) staining in livers of mice of the indicated genotype (magnification × 100). Percentage of Oil Red O–positive area was quantitated by ImageJ (n = 3‐6). Data are presented as mean ± SEM. * P < 0.05, ** P < 0.01, *** P < 0.001, **** P < 0.0001. Abbreviations: EtOH, alcohol; wt, weight.

Article Snippet: Antibodies used were GP96 (SMC‐105; StressMarq Biosciences, Cadboro, Canada), GRP78 (CST‐3183; Cell Signaling Technology), peroxisome proliferator‐activated receptor alpha (PPAR‐α) (sc‐9000; Santa Cruz Biotechnology, Dallas, TX), CyP2e1 (AB1252; MilliporeSigma, Burlington, MA), calnexin (ab2295; Abcam, Cambridge, United Kingdom), C/EBP‐homologous protein (CHOP) (sc‐7351; Santa Cruz Biotechnology), ATF6α (sc‐166659; Santa Cruz Biotechnology), ATF4 (10835‐1‐AP; Proteintech, Rosemont, IL), ATF3 (sc‐81189; Santa Cruz Biotechnology), β‐actin (ab6276; Abcam), tubulin (ab6046; Abcam), and TATA‐box protein (TBP) (ab818, Abcam).

Techniques: Staining

Journal: Hepatology Communications

Article Title: Myeloid Endoplasmic Reticulum Resident Chaperone GP96 Facilitates Inflammation and Steatosis in Alcohol‐Associated Liver Disease

doi: 10.1002/hep4.1713

Figure Lengend Snippet: Mice lacking myeloid‐specific GP96 exhibit altered lipid metabolism after 4 weeks of alcohol consumption. (A) PPAR‐α protein was detected in nuclear extracts of livers by western blot, and expression was quantitated and normalized to pair‐fed group (n = 4). TBP was used as loading control. The mRNA expression of genes involved in fatty acid β‐oxidation (CPT1a, ACOX1, LCAD, and MCAD) (B‐E) and lipogenesis (SREBPF1, SCD1, and FAS) (F‐H) was analyzed in WT and M‐GP96KO hepatocytes by RT‐PCR and compared with pair‐fed control (n = 3‐6). Data are presented as mean ± SEM. * P < 0.05, ** P < 0.01, *** P < 0.001, **** P < 0.0001.

Article Snippet: Antibodies used were GP96 (SMC‐105; StressMarq Biosciences, Cadboro, Canada), GRP78 (CST‐3183; Cell Signaling Technology), peroxisome proliferator‐activated receptor alpha (PPAR‐α) (sc‐9000; Santa Cruz Biotechnology, Dallas, TX), CyP2e1 (AB1252; MilliporeSigma, Burlington, MA), calnexin (ab2295; Abcam, Cambridge, United Kingdom), C/EBP‐homologous protein (CHOP) (sc‐7351; Santa Cruz Biotechnology), ATF6α (sc‐166659; Santa Cruz Biotechnology), ATF4 (10835‐1‐AP; Proteintech, Rosemont, IL), ATF3 (sc‐81189; Santa Cruz Biotechnology), β‐actin (ab6276; Abcam), tubulin (ab6046; Abcam), and TATA‐box protein (TBP) (ab818, Abcam).

Techniques: Western Blot, Expressing, Reverse Transcription Polymerase Chain Reaction

Journal: Hepatology Communications

Article Title: Myeloid Endoplasmic Reticulum Resident Chaperone GP96 Facilitates Inflammation and Steatosis in Alcohol‐Associated Liver Disease

doi: 10.1002/hep4.1713

Figure Lengend Snippet: Myeloid‐specific GP96 deficiency prevents chronic alcohol‐induced endotoxin and pro‐inflammatory cytokine production. (A) Endotoxin level was measured in serum (n = 8‐12). (B) CyP2e1 was detected in liver microsomal fraction by western blot, and calnexin was used as an internal loading control (n = 3). Total RNA from liver tissue was subjected to quantitative RT‐PCR for analysis of pro‐inflammatory cytokines TNF‐α, IL‐6, MCP‐1, and IL‐1β; NLRP3; anti‐inflammatory markers IL‐10, TGF‐β, and ATF3 (C); and macrophage markers (n = 6‐10) (F). (D) Total liver protein level for TNF‐α was measured in tissue extracts of pair‐fed and alcohol‐fed mice by ELISA (n = 6‐10). (E) ATF3 protein level was analyzed by western blot in whole‐liver extracts using tubulin as an internal control (n = 3). The mRNA expression profile of (G) pro‐inflammatory, and (H) anti‐inflammatory and restorative macrophage markers, Trem2 and ATF3, were analyzed in liver macrophages of pair‐fed and alcohol‐fed mice (n = 5). (I) The mRNA level of pro‐inflammatory cytokines was analyzed in BMDMs isolated from WT and M‐GP96KO mice and stimulated with 100 ng/mL LPS for 2 hours (n = 9). Data are represented as mean ± SEM. * P < 0.05, ** P < 0.01, *** P < 0.001, **** P < 0.0001.

Article Snippet: Antibodies used were GP96 (SMC‐105; StressMarq Biosciences, Cadboro, Canada), GRP78 (CST‐3183; Cell Signaling Technology), peroxisome proliferator‐activated receptor alpha (PPAR‐α) (sc‐9000; Santa Cruz Biotechnology, Dallas, TX), CyP2e1 (AB1252; MilliporeSigma, Burlington, MA), calnexin (ab2295; Abcam, Cambridge, United Kingdom), C/EBP‐homologous protein (CHOP) (sc‐7351; Santa Cruz Biotechnology), ATF6α (sc‐166659; Santa Cruz Biotechnology), ATF4 (10835‐1‐AP; Proteintech, Rosemont, IL), ATF3 (sc‐81189; Santa Cruz Biotechnology), β‐actin (ab6276; Abcam), tubulin (ab6046; Abcam), and TATA‐box protein (TBP) (ab818, Abcam).

Techniques: Western Blot, Quantitative RT-PCR, Enzyme-linked Immunosorbent Assay, Expressing, Isolation

Journal: Hepatology Communications

Article Title: Myeloid Endoplasmic Reticulum Resident Chaperone GP96 Facilitates Inflammation and Steatosis in Alcohol‐Associated Liver Disease

doi: 10.1002/hep4.1713

Figure Lengend Snippet: Loss of myeloid‐specific GP96 prevents LPS‐induced liver injury and inflammation. Female WT and M‐GP96KO mice were injected intraperitoneally with LPS (0.5 mg/kg body weight or saline (n = 4‐8). Serum was collected after 18 hours and subjected to analysis of ALT (A) and AST (B) and compared with the control group. (C) Livers were collected 2 hours after LPS injection, and liver cytokine mRNA was analyzed by RT‐PCR. Data are presented as mean ± SEM. * P < 0.05, ** P < 0.01, **** P < 0.0001.

Article Snippet: Antibodies used were GP96 (SMC‐105; StressMarq Biosciences, Cadboro, Canada), GRP78 (CST‐3183; Cell Signaling Technology), peroxisome proliferator‐activated receptor alpha (PPAR‐α) (sc‐9000; Santa Cruz Biotechnology, Dallas, TX), CyP2e1 (AB1252; MilliporeSigma, Burlington, MA), calnexin (ab2295; Abcam, Cambridge, United Kingdom), C/EBP‐homologous protein (CHOP) (sc‐7351; Santa Cruz Biotechnology), ATF6α (sc‐166659; Santa Cruz Biotechnology), ATF4 (10835‐1‐AP; Proteintech, Rosemont, IL), ATF3 (sc‐81189; Santa Cruz Biotechnology), β‐actin (ab6276; Abcam), tubulin (ab6046; Abcam), and TATA‐box protein (TBP) (ab818, Abcam).

Techniques: Injection, Reverse Transcription Polymerase Chain Reaction

Journal: Hepatology Communications

Article Title: Myeloid Endoplasmic Reticulum Resident Chaperone GP96 Facilitates Inflammation and Steatosis in Alcohol‐Associated Liver Disease

doi: 10.1002/hep4.1713

Figure Lengend Snippet: Inhibition of GP96 using specific inhibitor PU‐WS13 and siRNA reduces LPS‐induced pro‐inflammatory cytokine production. BMDMs were isolated from C57BL/6J mice and stimulated with LPS (100 ng/mL) for 2 hours and treated with PU‐WS13 (0.5 μM) either alone for 2 hours or before LPS for 1 hour. DMSO‐treated cells served as control group (n = 8). RT‐PCR was carried out to evaluate the expression of TNF‐α (A), IL‐6 (B), IL‐1β (C), and MCP‐1 (D) and compared with the untreated group. (E) Culture supernatant was evaluated for secreted TNF‐α by ELISA. (F) Murine macrophage RAW 264.7 cell line was transiently transfected with GP96 siRNA (100 nM) or negative control siRNA for 48 hours and stimulated with LPS for the final 6 hours. Secreted TNF‐α level was measured in culture supernatant by ELISA. Data are presented as mean ± SEM. *** P < 0.001, **** P < 0.0001. Abbreviation: ND, not detected.

Article Snippet: Antibodies used were GP96 (SMC‐105; StressMarq Biosciences, Cadboro, Canada), GRP78 (CST‐3183; Cell Signaling Technology), peroxisome proliferator‐activated receptor alpha (PPAR‐α) (sc‐9000; Santa Cruz Biotechnology, Dallas, TX), CyP2e1 (AB1252; MilliporeSigma, Burlington, MA), calnexin (ab2295; Abcam, Cambridge, United Kingdom), C/EBP‐homologous protein (CHOP) (sc‐7351; Santa Cruz Biotechnology), ATF6α (sc‐166659; Santa Cruz Biotechnology), ATF4 (10835‐1‐AP; Proteintech, Rosemont, IL), ATF3 (sc‐81189; Santa Cruz Biotechnology), β‐actin (ab6276; Abcam), tubulin (ab6046; Abcam), and TATA‐box protein (TBP) (ab818, Abcam).

Techniques: Inhibition, Isolation, Reverse Transcription Polymerase Chain Reaction, Expressing, Enzyme-linked Immunosorbent Assay, Transfection, Negative Control

Journal: Hepatology Communications

Article Title: Myeloid Endoplasmic Reticulum Resident Chaperone GP96 Facilitates Inflammation and Steatosis in Alcohol‐Associated Liver Disease

doi: 10.1002/hep4.1713

Figure Lengend Snippet: Schematic representation depicting pathophysiological significance of macrophage‐specific GP96 during chronic alcohol‐mediated liver inflammation and injury.

Article Snippet: Antibodies used were GP96 (SMC‐105; StressMarq Biosciences, Cadboro, Canada), GRP78 (CST‐3183; Cell Signaling Technology), peroxisome proliferator‐activated receptor alpha (PPAR‐α) (sc‐9000; Santa Cruz Biotechnology, Dallas, TX), CyP2e1 (AB1252; MilliporeSigma, Burlington, MA), calnexin (ab2295; Abcam, Cambridge, United Kingdom), C/EBP‐homologous protein (CHOP) (sc‐7351; Santa Cruz Biotechnology), ATF6α (sc‐166659; Santa Cruz Biotechnology), ATF4 (10835‐1‐AP; Proteintech, Rosemont, IL), ATF3 (sc‐81189; Santa Cruz Biotechnology), β‐actin (ab6276; Abcam), tubulin (ab6046; Abcam), and TATA‐box protein (TBP) (ab818, Abcam).

Techniques:

Journal: Molecular Metabolism

Article Title: TALK-1 reduces delta-cell endoplasmic reticulum and cytoplasmic calcium levels limiting somatostatin secretion

doi: 10.1016/j.molmet.2018.01.016

Figure Lengend Snippet: TALK-1 channels are expressed in mouse and human δ-cells. (A) Mouse pancreas section stained for TALK-1 (green) and somatostatin (red) (representative of N = 3 mice). (B) Mouse pancreas section stained for TALK-1 (green), ER (GRP94, red), and SST (cyan). (C) Human pancreas section stained for TALK-1 (green) and somatostatin (red) (representative of N = 3 pancreata). (D) Human pancreas section stained for TALK-1 (green), ER (GRP94, red), and somatostatin (E) K2P currents recorded from WT and TALK-1 KO δ-cells ( N = 3 mice per genotype). (F) K2P currents recorded from human δ-cells expressing TALK-1 DN or control mCherry. ( N = 3 islet preparations); * P < 0.05, ** P < 0.005.

Article Snippet: Sections were stained using primary antibodies against somatostatin (Santa Cruz Biotechnology sc-7819: 1:250), TALK-1 (Novus Biologicals #NBP1-83071; 1:175) or TALK-1a (Antibody Verify AAS72353C; 1:250), glucagon (Proteintech #15954-I-AP: 1:500), and the endoplasmic reticulum marker GRP94 (Novus Biologicals #NB300-619; 1:100); secondary antibodies used were Alexa Fluor 488-conjugated donkey anti-rabbit (Jackson Immunoresearch #711-546-152; 1:300), DyLight 650-conjugated donkey anti-goat (Thermo Fisher #SA5-10089; 1:250), and Cy3-conjugated donkey anti-mouse (Jackson Immunoresearch #715-166-150; 1:500).

Techniques: Staining, Expressing, Control

Journal: Cells

Article Title: In Vitro Inhibition of Endoplasmic Reticulum Stress: A Promising Therapeutic Strategy for Patients with Crohn’s Disease

doi: 10.3390/cells14040270

Figure Lengend Snippet: Activation of ER stress pathways and chaperone modulation in the colonic mucosa of Crohn’s disease patients. Immunohistochemical analysis of p-eIF2α ( A ), sXBP1 ( B ), ATF6 ( C ), and GRP94 ( D ) was performed on paraffin-embedded slides from the intestinal mucosa of both Crohn’s disease and control groups. The white arrows indicate positive epithelial cells, and the black arrows signalize positive cells from the lamina propria. Scale bar: 50 μm.

Article Snippet: The antibodies used included anti-phosphor-[Ser51] eIF2a (Abcam, ab32157, rabbit monoclonal), purified anti-Xbp-1 (BioLegend, 658802, mouse), GRP78 (Bioss Antibodies, bs-1219R, rabbit polyclonal), GRP94 (Bioss Antibodies, bs-0194R, rabbit polyclonal), anti-ATF6 (Atlas Antibodies, HPA005935, rabbit), and anti-DDIT3 (BioVision, A1674-100).

Techniques: Activation Assay, Immunohistochemical staining, Control

Journal: The Journal of Clinical Investigation

Article Title: IL-6/JAK1 pathway drives PD-L1 Y112 phosphorylation to promote cancer immune evasion

doi: 10.1172/JCI126022

Figure Lengend Snippet: (A) IP followed by WB analysis of JAK1, STT3A, and ngPD-L1 tyrosine phosphorylation (4G10) in FLAG–ngPD-L1–SK-HEP-1 cells with or without exposure to IL-6 (20 ng/mL) and ruxolitinib (10 μmol/L) for 30 minutes. (B) JAK1 interacts with ngPD-L1 in ER lumen. Representative images of individual immunofluorescence staining of JAK1 and PD-L1 interaction in ER region in Hep 3B cells by Duolink assay. The red dots (JAK1/PD-L1 interaction) indicate their interaction. Green fluorescence (HSP90B1) was used as ER marker, and DAPI as a nuclear marker. (C) Schematic showing JAK1/PD-L1 interaction in the ER. IC, intracellular domain; TM, transmembrane domain; EC, extracellular domain. (D) Trypsin digestion of ER fractions with (group 3) or without (group 2) permeabilization in Hep 3B cells.

Article Snippet: After trypsinization, samples were analyzed by Western blotting using primary antibodies against IRE1α (3294; 1:2000; Cell Signaling Technology), HSP90B1 (catalog NBP2-42379; 1:3000; Novus Biologicals), or JAK1 (catalog 610231; 1:2000; BD Biosciences).

Techniques: Phospho-proteomics, Immunofluorescence, Staining, Fluorescence, Marker