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Phosphoproteomic Analysis of PCB126 Impact on the Mouse Chronic-Binge Alcohol Feeding Model

ABSTRACT: Environmental pollutants, including polychlorinated biphenyls (PCBs) have been implicated in the pathogenesis of liver disease. To better understand how PCB126 promoted alcohol-associated liver disease (ALD) in our previous model, the current study utilized a phosphoproteomic approach for hypothesis generation regarding mechanisms of action. Briefly, male C57B/6J mice were exposed to 0.2 mg/kg polychlorinated biphenyl PCB126 or corn oil vehicle prior to ethanol (EtOH) or control diet feeding in the chronic-binge alcohol feeding model. Liver tissues were harvested during euthanasia and tissue collection, snap frozen in liquid nitrogen, and then were archived in a -80C freezer. For phosphoproteome analysis, six random liver tissues from four groups (N=24) were homogenized in 2% sodium dodecyl sulfate (SDS) radioimmunoprecipitation (RIPA) buffer with 1X HALT protease and phosphatase inhibitors. Lysates were trypsinized at a 1:20 (enzyme:sample) ratio and prepared following ProtiFi S-Trap mini spin column digestion protocol. Phospho-peptides were enriched with MagReSyn titanium ion - immobilized metal affinity chromatography (Ti-IMAC) microparticles following ReSyn Biosciences MagReSyn Ti-IMAC protocol. Samples were then purified using C18 PROTO 300 A Ultra MicroSpin columns, dried under a SpeedVac, and stored at -80C prior to peptide concentration assessment. Digests were fractionated by UPLC nanoflow liquid chromatography using PepMap RSLC C18 EASY-spray separating column at 40C with a 90-minute linear gradient. Eluates were introduced into an Exploris480 using an EASY-spray source (320C and 1.8kV). Full MS-ddMS2 method with a 3 second cycle time was generated in Xcalibur (v4.5.445.18) operating in positive polarity. RAW data files were separately searched in PeaksXpro (Bioinformatics Solutions Inc.; Waterloo, ON, Canada) using Denovo, PeaksDB, and PeaksPTM algorithms against the UniprotKB Mus musculus canonical protein sequences (proteomics ID: UP000000589) downloaded March 17, 2023. Label Free Quantification algorithm was then used with PeaksPTM results utilizing a mass error tolerance of 10 ppm and retention time shift tolerance of 6-minutes. Peptides were accepted at a 1% FDR threshold for consideration by the Label Free Quantification algorithm.

INSTRUMENT(S): Orbitrap Exploris 480

ORGANISM(S): Mus <mouse, Genus> (ncbitaxon:10088)

SUBMITTER: Timothy D. Cummins, PhD

PROVIDER: MSV000093903 | MassIVE | Mon Jan 22 12:28:00 GMT 2024

SECONDARY ACCESSION(S): PXD048773

REPOSITORIES: MassIVE

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Project description:Background and aims: Liver is a major target organ for alcohol-induced disease and the spectrum of pathological states elicited by alcohol in liver comprises steatosis, alcoholic steatohepatitis, progressive fibrosis and cirrhosis, conditions that may progress to hepatocellular carcinoma. Many experimental animal models of alcoholic steatohepatitis exist that vary in duration, mode of alcohol administration and the degree and types of liver injury produced. While most of these models, regardless whether alcohol is administered through liquid diet or intragastrically, produce steatohepatitis and mild fibrosis, it is widely acknowledged that these models fail to fully recapitulate key characteristics of severe forms of alcoholic liver disease, such as alcoholic hepatitis. Recent studies attempted to combine alcohol and fibrosis and achieved promising results in mouse models that achieve some of the key features of alcoholic liver disease accompanied by exacerbated fibrosis and acute renal injury. This study combined a chronic cholestatic liver fibrosis model induced by 3,5-diethoxycarbonyl-1,4-dihydrocollidine (DDC) with a mouse model of intragastric alcohol feeding. Methods: Adult male C57BL6/J mice were treated with 3,5-diethoxycarbonyl-1,4-dihydrocolidine (DDC) containing diet (0.05% w/w) to induce chronic liver fibrosis. Following DDC-induced fibrogenesis, ethyl alcohol (EtOH) (up to 27 g/ kg/day, up to 28 days) was administered continuously to mice via a gastric feeding tube (Tsukamoto-Frenchmodel of alcoholic liver disease). Results: Exposure to DDC or EtOH alone resulted in liver fibrosis or steatosis, respectively. Combined treatment with DDC and EtOH lead to an additive effect on liver injury, as evident by the development of hepatic inflammation, steatosis, and pericellular fibrosis, and by increased serum transaminase levels, compared to mice treated with either agent alone. Liver transcriptomic changes specific to combined treatment group included pathways involved in the cell cycle and DNA damage. Analyses of feces from these mice revealed alcohol-associated changes to the bile acid profile and gut microbiome. Conclusions: Mice treated with DDC and EtOH displayed several key characteristics of human alcoholic hepatitis, including pericellular fibrosis, increased hepatic bacterial load with dysbiosis, reduced capacity of the microbiome to synthesize secondary bile acids.

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Phosphoproteomic Analysis of PCB126 Impact on the Mouse Chronic-Binge Alcohol Feeding Model

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