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4 protocols using protein disulfide isomerase

1

Molecular Mechanisms of Metabolic Dysfunction

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PCB2, phenylephrine (Phe), acetylcholine (ACh), sodium nitroprusside (SNP), 1H-Oxadiazolo [ [3 (link),4 (link)],-a] quinoxalin-1-one (ODQ), indomethacin, compound C (CC), GW501516, mannitol, palmitate acid (PA), d-glucose, dihydroethidium (DHE), A23187 and tunicamycin (TM) were from Sigma-Aldrich (St. Louis, MO, USA). NG-nitro-l-arginine methyl ester (l-NAME), 1400W and GSK0660 were from Tocris Bioscience (Bristol, UK). L-012 was from Wako Pure Chemical Industries (Osaka, Japan). Recombinant human PPARδ protein and anti-phosphorylated IRE1α (Ser724) antibody were obtained from Abcam (Cambridge, MA, USA). Antibodies against adenosine monophosphate-activated protein kinase (AMPK), phospho-AMPK (Thr172), activating transcription factor 4 (ATF4), ATF6, GRP78, protein-disulfide isomerase (PDI), IRE1α and Griess reagent nitrite measurement kit were from Cell Signaling Technology (Danvers, MA, USA). Antibodies against PERK and phospho-PERK (Thr981), 4-Amino-5-methylamino-2′,7′-difluorofluorescein diacetate (DAF-FM DA) were from ThermoFisher Scientific (Waltham, MA, USA). Antibody against β-actin and horseradish peroxidase (HRP)-conjugated secondary antibodies were from Santa Cruz Biotechnology (Santa Cruz, CA, USA).
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2

Liver Protein Analysis by Western Blot

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Mouse livers were homogenized in ice‐cold RIPA buffer containing protease and phosphatase inhibitors (Thermo‐Fisher), and then, diluted in laemmli buffer containing 5% of β‐mercaptoethanol before being heated at 95°C for 5 min. Proteins were resolved by SDS‐PAGE before being transferred to a nitrocellulose membrane. Membranes were probed with primary antibodies targeting the aryl hydrocarbon receptor (AhR) (Cell Signaling Technologies), cleaved caspase‐3 (Cell Signaling Technologies), Ly6G/6C (Thermo‐Fisher), glycoprotein VI (GPVI) (Millipore, Burlington, MA), 5‐hydroxytrytamine receptor 2B (5‐HT2B) (Novus Biologicals, Littleton, CO), indoleamine 2,3‐dioxygenase (IDO2) (Thermo‐Fisher), nuclear factor kappa‐light‐chain‐enhancer of activated B cells (NFkB) p65 subunit (Cell Signaling Technologies), phospho‐NFkB p65 subunit (Cell Signaling Technologies), Poly [ADP‐ribose] polymerase 1 (PARP‐1) (Proteintech, Rosemont, IL), protein disulfide isomerase (PDI, Cell Signaling Technologies), or vinculin (Cell Signaling Technologies) overnight before being probed with an appropriate secondary antibody for 1 hr. The Clarity electrochemiluminescent substrate kit and ChemiDoc MP imaging system (BioRad, Hercules, CA) were used for detection and image acquisition.
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3

Autophagy and Inflammation Modulation in Cells

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Dulbecco’s modified Eagle’s medium (DMEM), fetal bovine serum (FBS), Lipofectamine 3000 transfection reagent, TRIzol reagent, LysoTracker Red and the high capacity cDNA reverse transcription kit were purchased from Thermo Fisher Scientific (Waltham, MA, USA). Rapa and 3-MA were obtained from Sigma-Aldrich Co. (St Louis, MO, USA). CQ and BAY-11-7082 were obtained from Selleck (Houston, Texas, USA). Mouse anti-human monoclonal antibodies against PreS2/S, β-actin, and histone 3 were purchased from Abcam (C ambridge, UK). Anti-human monoclonal antibodies against LC3, Beclin-1, SQSTM/P62, NF-κB, p-NF-κB/p65, IκB, p-IκB, Vimentin, E-cadherin and Protein Disulfide Isomerase (PDI) were purchased from Cell Signaling Technology (Boston, MA, USA). The Immobilon Western Chemiluminescent HRP substrate was purchased from EMD Millipore (Billerica, MA, USA). The cell counting kit-8 was purchased from Beyotime (Shanghai, China). Alexa Fluor 488-conjugated goat anti-mouse IgG (H + L), Alexa Fluor 594-conjugated goat anti-rabbit IgG (H + L), DyLight 405-labeled goat anti-mouse IgG (H + L) and Alexa Fluor 488-conjugated goat anti-rabbit IgG (H + L) were purchased from ZSGB-BIO (Beijing, China). Propidium Iodide (PI)/RNase staining buffer was purchased from BD Biosciences (Franklin, NJ, USA).
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4

Histological and Immunohistochemical Analysis of Embryonic Tissues

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The embryos were fixed in 4% paraformaldehyde (PFA) in phosphate buffered saline (PBS, pH 7.4) at 4°C for 16 hours, followed by dehydration through a series of concentrations of ethanol and embedding in paraffin wax through mediation steps of xylene. Tissue sections at 6 μm thickness were cut using a microtome.
Tissue sections were dewaxed in xylene and rehydrated through a reverse ethanol concentration series to water. For histological preparation, the sections were stained with hematoxylin and eosin (Junqueira and Carneiro, 2003 ).
For immunohistochemistry, the sections were boiled in a citrate buffer (10 mM Citrate Acid, pH 6.0) for 5 minutes to unmask antigens, equilibrated in PBS (pH 7.4), incubated with primary antibodies recognizing 4-hydroxynonenal (4-HNE; Millipore, Temecula, CA), 3-nitrotyrosine (3-NT, Cell Signaling Technology, Danvers, MA), protein disulfide isomerase (PDI; Cell Signaling Technology), phosphorylated (p-) calnexin (Abcam, Cambridge, MA), Inhibin βA (EMD Biosciences, Gibbstown, NJ), and p-Smad3 (Cell Signaling Technology) (Zhao, 2012 (link)).
Signals were detected using secondary antibodies conjugated with alkaline phosphatase (AP; Santa Cruz Biotechnology, Santa Cruz, CA) and its substrates (nitro-blue tetrazolium and 5-bromo-4-chloro-3’-indolyphosphate). Tissue sections were counterstained with fast red.
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