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Gruszewska E, Grytczuk A, Chrostek L. Glycosylation in viral hepatitis. Biochim Biophys Acta Gen Subj 2021; 1865:129997. [PMID: 34474116 DOI: 10.1016/j.bbagen.2021.129997] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 08/26/2021] [Accepted: 08/26/2021] [Indexed: 01/12/2023]
Abstract
BACKGROUND The interaction between hepatitis viruses and host cells is regulated by glycans exposed on the surfaces of human and viruses cells. As the biosynthesis and degradation of human glycoproteins take place at the highest level in the liver, the changes in glycosylation of serum proteins may potentially be useful in the diagnosis of liver pathology. On the other hand, specific alterations in viruses envelope glycans could cause large changes in the entry process of hepatitis viruses into a host cells. SCOPE OF REVIEW Unique alterations in glycosylation of specific proteins can be detected in HBV and HCV infected patients especially with confirmed fibrosis/cirrhosis. On the other hand, viral envelope proteins that bind to host cells are glycosylated. These glycosylated proteins play a key role in recognition, binding and penetration of the host cells. In this review we summarized the knowledge about significance of glycosylation for viral and host factors. MAJOR CONCLUSIONS Glycosylation changes in single serum glycoproteins are noticed in the sera of patients with viral hepatitis. However, a more specific biomarker for the diagnosis of chronic hepatitis than that of a single glycosylated molecule is systemic investigation of complete set of glycan structures (N-glycome). Glycans play important roles in the viral biology cycle especially as a connecting element with host receptors. GENERAL SIGNIFICANCE The interaction between virus glycoproteins and cellular receptors, which are also glycoproteins, determines the possibility of virus penetration into host cells. Therefore these glycans can be the targets for the developing of novel treatment strategies of viral hepatitis.
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Affiliation(s)
- Ewa Gruszewska
- Department of Biochemical Diagnostics, Medical University of Bialystok, Waszyngtona 15A, 15-269 Bialystok, Poland
| | - Agnieszka Grytczuk
- Department of Laboratory Diagnostics, University Clinical Hospital in Bialystok, Bialystok, Poland
| | - Lech Chrostek
- Department of Biochemical Diagnostics, Medical University of Bialystok, Waszyngtona 15A, 15-269 Bialystok, Poland.
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Toita R, Kang JH. Long-term profile of serological biomarkers, hepatic inflammation, and fibrosis in a mouse model of non-alcoholic fatty liver disease. Toxicol Lett 2020; 332:1-6. [PMID: 32579995 DOI: 10.1016/j.toxlet.2020.06.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 06/16/2020] [Accepted: 06/19/2020] [Indexed: 12/16/2022]
Abstract
Non-alcoholic fatty liver disease (NAFLD) can be typically classified into two subgroups: non-alcoholic fatty liver and non-alcoholic steatohepatitis. Mouse models of NAFLD are useful tools for understanding the pathogenesis and progression of NAFLD and for developing drugs for its treatment. Here, we investigated the time-dependent changes in serum lipids and biochemical markers of hepatic function, hepatic inflammation, and fibrosis in mice fed a normal diet (ND) or a NAFLD diet (choline deficient, L-amino acid-defined, high-fat diet; CDAHFD) for 12 weeks. CDAHFD-fed mice showed significantly reduced serum levels of total cholesterol, triglyceride, and high-density lipoprotein cholesterol throughout the treatment period compared with ND-fed mice. The changes in aspartate aminotransferase, alanine aminotransferase, lactate dehydrogenase, and total bilirubin showed an inverse U-shaped curve in the CDAHFD-fed mice. The serum alkaline phosphatase levels decreased in both ND- and CDAHFD-fed mice in a time-dependent manner. Furthermore, CDAHFD-fed mice showed a significant increase in the number of inflammatory foci and hepatic fibrosis at 6-12 weeks, although inflammatory foci and hepatic fibrogenesis were observable at relatively early stages as well (1-4 weeks). In conclusion, the long-term profile of serological biomarkers, hepatic inflammation, and fibrosis in CDAHFD-fed mice identified in this study may provide a better understanding of NAFLD pathogenesis.
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Affiliation(s)
- Riki Toita
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka, 563-8577, Japan; AIST-Osaka University Advanced Photonics and Biosensing Open Innovation Laboratory, AIST, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Jeong-Hun Kang
- Division of Biopharmaceutics and Pharmacokinetics, National Cerebral and Cardiovascular Center Research Institute, 6-1 Shinmachi, Kishibe, Suita, Osaka, 564-8565, Japan.
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Furosine, a Maillard Reaction Product, Triggers Necroptosis in Hepatocytes by Regulating the RIPK1/RIPK3/MLKL Pathway. Int J Mol Sci 2019; 20:ijms20102388. [PMID: 31091743 PMCID: PMC6566718 DOI: 10.3390/ijms20102388] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 05/11/2019] [Accepted: 05/13/2019] [Indexed: 12/22/2022] Open
Abstract
As one of the typical Maillard reaction products, furosine has been widely reported in a variety of heat-processed food. Though furosine was shown to be toxic on organs, its toxicity mechanism is still unclear. The present study aimed to investigate the toxicity mechanism of furosine in liver tissue. An intragastric gavage mice model (42-day administration, 0.1/0.25/0.5 g/kg of furosine per day) and a mice primary hepatocyte model were employed to investigate the toxicity mechanism of furosine on mice liver tissue. A metabonomics analysis of mice liver, serum, and red blood cells (RBC) was performed. The special metabolic mediator of furosine, lysophosphatidylcholine 18:0 (LPC (18:0)) was identified. Then, the effect of the upstream gene phospholipase A2 gamma (PLA2-3) on LPC (18:0), as well as the effect of furosine (100 mg/L) on the receptor-interacting serine/threonine-protein kinase (RIPK)1/RIPK3/mixed lineage kinase domain-like protein (MLKL) pathway and inflammatory factors, was determined in liver tissue and primary hepatocytes. PLA2-3 was found to regulate the level of LPC (18:0) and activate the expression of RIPK1, RIPK3, P-MLKL, and of the inflammatory factors including tumor necrosis factor α (TNF-α) and interleukin (IL-1β), both in liver tissue and in primary hepatocytes. Upon treatment with furosine, the upstream sensor PLA2-3 activated the RIPK1/RIPK3/MLKL necroptosis pathway and caused inflammation by regulating the expression of LPC (18:0), which further caused liver damage.
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Jiang ZJ, Shen QH, Chen HY, Yang Z, Shuai MQ, Zheng SS. Galectin-1 gene silencing inhibits the activation and proliferation but induces the apoptosis of hepatic stellate cells from mice with liver fibrosis. Int J Mol Med 2018; 43:103-116. [PMID: 30365068 PMCID: PMC6257862 DOI: 10.3892/ijmm.2018.3950] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 10/09/2018] [Indexed: 12/19/2022] Open
Abstract
Liver fibrosis is a serious threat to human health, and there is currently no effective clinical drug for treatment of the disease. Although Galectin-1 is effective, its role in liver function, inflammation, matrix metalloproteinases and the activation of hepatic stellate cells (HSCs) remains to be elucidated. The aim of the present study was to elucidate the effect of Galectin-1 on the activation, proliferation and apoptosis of HSCs in a mouse model of liver fibrosis. Following successful model establishment and tissue collection, mouse HSCs (mHSCs) were identified and an mHSC line was constructed. Subsequently, to determine the role of Galectin-1 in liver fibrosis, the expression levels of transforming growth factor (TGF)-β1, connective tissue growth factor (CTGF) and α-smooth muscle actin (α-SMA) pre- and post-transfection were evaluated by reverse transcription-quantitative polymerase chain reaction and western blot analyses. In addition, the effects of Galectin-1 on the biological behavior and mitochondrial function of mHSCs were determined using a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay, flow cytometry and a scratch test. It was first observed that the expression levels of Galectin-1, TGF-β1, CTGF and α-SMA were downregulated by silencing the gene expression of Galectin-1. Additionally, silencing the gene expression of Galectin-1 inhibited cell cycle progression, proliferation and migration but induced the apoptosis of mHSCs from mice with liver fibrosis. Furthermore, the in vivo experimental results suggested that silencing the gene expression of Galectin-1 improved liver fibrosis. Collectively, it was concluded that silencing the gene expression of Galectin-1 ameliorates liver fibrosis and that functionally suppressing Galectin-1 may be a future therapeutic strategy for liver fibrosis.
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Affiliation(s)
- Zhi-Jun Jiang
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310003, P.R. China
| | - Qing-Hua Shen
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine (Jinyun Branch), Jinyun, Zhejiang 321400, P.R. China
| | - Hai-Yong Chen
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310003, P.R. China
| | - Zhe Yang
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310003, P.R. China
| | - Ming-Qi Shuai
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310003, P.R. China
| | - Shu-Sen Zheng
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310003, P.R. China
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Li M, Wang S, Li X, Jiang L, Wang X, Kou R, Wang Q, Xu L, Zhao N, Xie K. Diallyl sulfide protects against lipopolysaccharide/d-galactosamine-induced acute liver injury by inhibiting oxidative stress, inflammation and apoptosis in mice. Food Chem Toxicol 2018; 120:500-509. [DOI: 10.1016/j.fct.2018.07.053] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Revised: 07/11/2018] [Accepted: 07/28/2018] [Indexed: 12/12/2022]
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Alcohol-free fermented blueberry-blackberry beverage phenolic extract attenuates diet-induced obesity and blood glucose in C57BL/6J mice. J Nutr Biochem 2016; 31:45-59. [PMID: 27133423 DOI: 10.1016/j.jnutbio.2015.12.013] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 11/10/2015] [Accepted: 12/21/2015] [Indexed: 02/08/2023]
Abstract
The aim of this study was to determine the potential of phenolic compounds from a fermented blackberry-blueberry beverage to reduce diet-induced obesity and hyperglycemia in mice fed a 60% high-fat diet (HFD) for 10weeks after 1week of pretreatment. C57BL/6J mice were randomized into six groups and allowed to drink (ad libitum) an alcohol-free blackberry-blueberry beverage [alcohol-free fermented beverage (AFFB), 8.4mg anthocyanin (ANC)/kg body weight (BW)/day]; three doses of a phenolic extract [postamberlite extract (PAE)] from AFFB at 0.1×, 1× and 2× ANC concentrations; sitagliptin (hypoglycemic positive control); or water (negative control). Weight and fat mass gain were attenuated in mice receiving the highest doses of PAE (18.9mg ANC/kg BW/day, P<.05). There were also reductions (P<.05) in percent fat mass, epididymal fat pad weights, mean adipocyte diameters and plasma triglycerides and cholesterol associated with PAE treatments. By the end of the study, fasting blood glucose for mice receiving 9mg (1×) or 18.9mg (2×) ANC/kg BW/day was significantly lower than in the water and the sitagliptin groups (P<.05). Histological and histochemical analyses revealed an unexpected change in liver of mice fed ANC at 1× or 2× doses consisting of liver enlargement and increased lipid deposition. PAE also induced the most differential gene expression changes, including highly significant downstream effects at all doses to reduce d-glucose concentrations. Overall, phenolic compounds from the fermented blueberry-blackberry beverage had an impact to attenuate the development of obesity and fasting blood glucose in C57BL/6J mice.
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Specific N-glycans of Hepatocellular Carcinoma Cell Surface and the Abnormal Increase of Core-α-1, 6-fucosylated Triantennary Glycan via N-acetylglucosaminyltransferases-IVa Regulation. Sci Rep 2015; 5:16007. [PMID: 26537865 PMCID: PMC4633583 DOI: 10.1038/srep16007] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 10/01/2015] [Indexed: 12/23/2022] Open
Abstract
Glycosylation alterations of cell surface proteins are often observed during the progression of malignancies. The specific cell surface N-glycans were profiled in hepatocellular carcinoma (HCC) with clinical tissues (88 tumor and adjacent normal tissues) and the corresponding serum samples of HCC patients. The level of core-α-1,6-fucosylated triantennary glycan (NA3Fb) increased both on the cell surface and in the serum samples of HCC patients (p < 0.01). Additionally, the change of NA3Fb was not influenced by Hepatitis B virus (HBV)and cirrhosis. Furthermore, the mRNA and protein expression of N-acetylglucosaminyltransferase IVa (GnT-IVa), which was related to the synthesis of the NA3Fb, was substantially increased in HCC tissues. Knockdown of GnT-IVa leads to a decreased level of NA3Fb and decreased ability of invasion and migration in HCC cells. NA3Fb can be regarded as a specific cell surface N-glycan of HCC. The high expression of GnT-IVa is the cause of the abnormal increase of NA3Fb on the HCC cell surface, which regulates cell migration. This study demonstrated the specific N-glycans of the cell surface and the mechanisms of altered glycoform related with HCC. These findings lead to better understanding of the function of glycan and glycosyltransferase in the tumorigenesis, progression and metastasis of HCC.
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Liu X, Nie H, Zhang Y, Yao Y, Maitikabili A, Qu Y, Shi S, Chen C, Li Y. Cell surface-specific N-glycan profiling in breast cancer. PLoS One 2013; 8:e72704. [PMID: 24009699 PMCID: PMC3751845 DOI: 10.1371/journal.pone.0072704] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Accepted: 07/14/2013] [Indexed: 12/12/2022] Open
Abstract
Aberrant changes in specific glycans have been shown to be associated with immunosurveillance, tumorigenesis, tumor progression and metastasis. In this study, the N-glycan profiling of membrane proteins from human breast cancer cell lines and tissues was detected using modified DNA sequencer-assisted fluorophore-assisted carbohydrate electrophoresis (DSA-FACE). The N-glycan profiles of membrane proteins were analyzed from 7 breast cancer cell lines and MCF 10A, as well as from 100 pairs of breast cancer and corresponding adjacent tissues. The results showed that, compared with the matched adjacent normal tissue samples, two biantennary N-glycans (NA2 and NA2FB) were significantly decreased (p <0.0001) in the breast cancer tissue samples, while the triantennary glycan (NA3FB) and a high-mannose glycan (M8) were dramatically increased (p = 0.001 and p <0.0001, respectively). Moreover, the alterations in these specific N-glycans occurred through the oncogenesis and progression of breast cancer. These results suggested that the modified method based on DSA-FACE is a high-throughput detection technology that is suited for analyzing cell surface N-glycans. These cell surface-specific N-glycans may be helpful in recognizing the mechanisms of tumor cell immunologic escape and could be potential targets for new breast cancer drugs.
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Affiliation(s)
- Xia Liu
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang, China
| | - Huan Nie
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang, China
| | - Yubao Zhang
- Tumor Hospital of Harbin Medical University, Harbin, Heilongjiang, China
| | - Yuanfei Yao
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang, China
| | - Alaiyi Maitikabili
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang, China
| | - Youpeng Qu
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang, China
| | - Shuliang Shi
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang, China
| | - Cuiying Chen
- Department for Molecular Biomedical Research, VIB, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
- * E-mail: (YL); (CC)
| | - Yu Li
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang, China
- * E-mail: (YL); (CC)
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Kobayashi S, Nouso K, Kinugasa H, Takeuchi Y, Tomoda T, Miyahara K, Hagihara H, Kuwaki K, Onishi H, Nakamura S, Ikeda F, Miyake Y, Shiraha H, Takaki A, Yamamoto K. Clinical utility of serum fucosylated hemopexin in Japanese patients with hepatocellular carcinoma. Hepatol Res 2012; 42:1187-95. [PMID: 22639859 DOI: 10.1111/j.1872-034x.2012.01044.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
AIM Hepatocellular carcinoma (HCC) is a common clinical problem all over the world. Fucosylated hemopexin (Fuc-Hpx) is a newly reported glycoprotein for the diagnosis of HCC, however, its clinical implications are unclear. The aim of this study was to elucidate the clinical utility of Fuc-Hpx in Japanese patients with HCC. METHODS The sera from 331 HCC patients, 45 with liver cirrhosis (LC), 85 with chronic hepatitis (CH) and 22 healthy people were examined for the expression of Fuc-Hpx; the level was compared with clinical parameters as well as hemopexin (Hpx) expression. The expressions of Fuc-Hpx in 12 HCC tissues and corresponding adjacent non-cancerous liver tissues were also examined. RESULTS No correlation was observed between Hpx and Fuc-Hpx level. The median Fuc-Hpx levels in healthy people and CH, LC and HCC patients were 3.8, 3.7, 6.1 and 7.6 AU/mL, respectively (CH vs LC, P = 0.002; CH vs HCC, P < 0.001; LC vs HCC, P = 0.02). Multivariate analysis revealed that low albumin, low prothrombin time and the presence of HCC were significantly correlated with high Fuc-Hpx (P = 0.013, =0.001 and <0.001, respectively). Among the HCC patients, albumin was correlated with high Fuc-Hpx; however, none of the tumor factors, such as tumor size, tumor number and tumor stage, was correlated with Fuc-Hpx level. The expression of Fuc-Hpx in cancer tissue was not different from that in non-cancerous tissue. CONCLUSION Fuc-Hpx is a valuable biomarker for HCC but it might be a marker for hypercarcinogenic liver rather than a marker for tumor-bearing liver.
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Affiliation(s)
- Sayo Kobayashi
- Departments of Gastroenterology and Hepatology Molecular Hepatology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
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Serum protein N-glycan alterations of diethylnitrosamine-induced hepatocellular carcinoma mice and their evolution after inhibition of the placental growth factor. Mol Cell Biochem 2012; 372:199-210. [PMID: 23001868 DOI: 10.1007/s11010-012-1461-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Accepted: 09/14/2012] [Indexed: 12/17/2022]
Abstract
Placental growth factor (PlGF) inhibition produced promising results in reducing tumor burden in a diethylnitrosamine (DEN)-induced mouse model for hepatocellular carcinoma (HCC). The aim of this study was to non-invasively assess the improved histology by performing a serum glycomic analysis. To elucidate the molecular mechanism underlying the observed glycomic effects, we investigated the transcription and expression of E26 transformation-specific sequence 1 (Ets-1), a transcription factor essential for the glycomic and angiogenic changes in malignant transformation, including its different phosphorylated forms that result from activation of the MAP kinase and a Ca(2+)-dependent pathway. In addition, three Ets-1-dependent glycosyltransferase genes, Mgat4a, Mgat4b, and Mgat5, were also evaluated. HCC was induced in mice by weekly injections with DEN for 16, 20, 25, and 30 w. In the treatment study, mice were injected with DEN for 25 w and subsequently treated with PlGF antibodies (5D11D4) for 5 w. Finally, PlGF-/- mice were injected with DEN for 20, 25, and 30 w. Serum N-glycans were analyzed with DNA sequencer-assisted fluorophore-assisted capillary electrophoresis and compared with histology. Maximum altered N-glycan phenotype was reached after 20 w of DEN-injections, i.e., when the first neoplastic lesions started to appear. 5D11D4-treatment improved the glycomic phenotype in that 7 of the 11 altered glycans tended to normalize. The PlGF-/- mice also showed a normalization trend, although not to the same extent of the treatment group. Number of Ets1, Mgat4a, Mgat4b, and Mgat5 transcripts increased considerably in DEN-injected mice, however, a non-significant decrease was observed after 5D11D4-treatment. On the protein level, 5D11D4-treatment had a prominent effect on the MAP kinase pathway with a significant p38 activation, yet independent of Ets-1 function.
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Blomme B, Van Steenkiste C, Grassi P, Haslam SM, Dell A, Callewaert N, Van Vlierberghe H. Alterations of serum protein N-glycosylation in two mouse models of chronic liver disease are hepatocyte and not B cell driven. Am J Physiol Gastrointest Liver Physiol 2011; 300:G833-42. [PMID: 21292995 DOI: 10.1152/ajpgi.00228.2010] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
N-glycosylation of immunoglobulin G (IgG) has an important impact on the modification of the total serum N-glycome in chronic liver patients. Our aim was to determine the role and magnitude of the alterations in which hepatocytes and B cells are involved in two mouse models of chronic liver disease. Common bile duct ligation (CBDL) and subcutaneous injections with CCl(4) were induced in B cell-deficient and wild-type (WT) mice. IgG depletion was performed with beads covered with protein A/G and the depletions were evaluated by SDS-PAGE and Western blot analysis. N-glycan analysis was performed by improved DSA-FACE technology. Structural analysis of the mouse serum N-glycans was performed by exoglycosidase digests and MALDI-TOF mass spectrometry of permethylated glycans. The alterations seen in B cell-deficient mice closely resembled the alterations in WT mice, in both the CBDL and the CCl(4) models. N-glycan analysis of the IgG fraction in both mouse models revealed different changes compared with humans. Overall, the impact of IgG glycosylation on total serum glycosylation was marginal. Interestingly, the amount of fibrosis present in CBDL B cell-deficient mice was significantly increased compared with CBDL WT mice, whereas the opposite was true for the CCl(4) model as determined by Sirius red staining. However, this had no major effect on the alteration of N-glycosylation of serum proteins. Alterations of total serum N-glycome in mouse models of chronic liver disease are hepatocyte-driven. Undergalactosylation of IgG is not present in mouse models of chronic liver disease.
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Affiliation(s)
- Bram Blomme
- Dept. of Hepatology and Gastroenterology, Ghent Univ. Hospital, Belgium
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