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Hepatology

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PD-1 blockade improves Kupffer cell bacterial clearance in acute liver injury
Evangelos Triantafyllou, … , Charalambos G. Antoniades, Mark R. Thursz
Evangelos Triantafyllou, … , Charalambos G. Antoniades, Mark R. Thursz
Published December 15, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI140196.
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PD-1 blockade improves Kupffer cell bacterial clearance in acute liver injury

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Abstract

Acute liver failure (ALF) patients display systemic innate immune suppression and increased susceptibility to infections. PD-1 expression by macrophages has been associated with immune suppression during sepsis and cancer. We therefore examined the role of PD-1/PD-L1 pathway in regulating Kupffer cell inflammatory and antimicrobial responses in acetaminophen (APAP) induced acute liver injury. Using intravital imaging and flow cytometry we found impaired Kupffer cell bacterial clearance and systemic bacterial dissemination in mice with liver injury. Increased PD-1 and PD-L1 expression was detected in Kupffer cells and lymphocyte subsets, respectively, during resolution of injury. Gene expression profiling of PD-1+ Kupffer cells revealed an immune-suppressive profile and reduced pathogen responses. Compared to wild-type, PD-1 deficient or anti-PD-1 treated mice with liver injury showed improved Kupffer cell bacterial clearance, reduced tissue bacterial load and protection from sepsis. Blood sample analyses of ALF patients revealed enhanced PD-1 and PD-L1 expression of monocytes and lymphocytes, respectively, and that plasma soluble PD-L1 levels predict patient outcome and sepsis. PD-1 in vitro blockade restored monocyte functionality. Our study describes a role for PD-1/PD-L1 axis in suppressing Kupffer cell and monocyte antimicrobial responses after liver injury and suggests anti-PD-1 immunotherapy as a strategy to reduce infection susceptibility in ALF.

Authors

Evangelos Triantafyllou, Cathrin L. C. Gudd, Marie-Anne Mawhin, Hannah C. Husbyn, Francesca M. Trovato, Matthew K. Siggins, Thomas O'Connor, Hiromi Kudo, Sujit K. Mukherjee, Julia A. Wendon, Christine Bernsmeier, Robert D. Goldin, Marina Botto, Wafa Khamri, Mark J.W. McPhail, Lucia A. Possamai, Kevin J. Woollard, Charalambos G. Antoniades, Mark R. Thursz

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Neutrophil-to-hepatocyte communication via LDLR-dependent miR-223-enriched extracellular vesicle transfer ameliorates nonalcoholic steatohepatitis
Yong He, … , George Kunos, Bin Gao
Yong He, … , George Kunos, Bin Gao
Published December 10, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI141513.
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Neutrophil-to-hepatocyte communication via LDLR-dependent miR-223-enriched extracellular vesicle transfer ameliorates nonalcoholic steatohepatitis

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Abstract

Neutrophil infiltration around lipotoxic hepatocytes is a hallmark of nonalcoholic steatohepatitis (NASH); however, how these two types of cells communicate remain obscure. We have previously demonstrated that neutrophil-specific microRNA-223 (miR-223) is elevated in hepatocytes to limit NASH progression in obese mice. Here we demonstrated that this elevation of miR-223 in hepatocytes was due to preferential uptake of miR-223-enriched extracellular vesicles (EVs) derived from neutrophils as well other types of cells albeit to a lesser extent. This selective uptake was dependent on the expression of low-density lipoprotein receptor (LDLR) on hepatocytes and apolipoprotein E (APOE) on neutrophil-derived EVs, which was enhanced by free fatty acids. Once internalized by hepatocytes, the EV-derived miR-223 acted to inhibit hepatic inflammatory and fibrogenic gene expression. In the absence of this LDLR-APOE dependent uptake of miR-223-enriched EVs, the progression of steatosis to NASH was accelerated. In contrast, augmentation of this transfer by treatment with an inhibitor of proprotein convertase subtilisin/kexin type 9, a drug used to lower blood cholesterol by upregulating LDLR, ameliorated NASH in mice. This specific role of LDLR and APOE in the selective control of miR-223-enriched EV transfer from neutrophils to hepatocytes may serve as a potential therapeutic target for NASH.

Authors

Yong He, Robim M. Rodrigues, Xiaolin Wang, Wonhyo Seo, Jing Ma, Seonghwan Hwang, Yaojie Fu, Eszter Trojnar, Csaba Matyas, Suxian Zhao, Ruixue Ren, Dechun Feng, Pal Pacher, George Kunos, Bin Gao

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The loss-of-function PCSK9Q152H variant increases ER chaperones GRP78 and GRP94 and protects against liver injury
Paul F. Lebeau, … , Michel Chretien, Richard C. Austin
Paul F. Lebeau, … , Michel Chretien, Richard C. Austin
Published November 19, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI128650.
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The loss-of-function PCSK9Q152H variant increases ER chaperones GRP78 and GRP94 and protects against liver injury

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ABSTRACTIndividuals harboring the loss-of-function (LOF) proprotein convertase subtilising/kexin type 9 Gln152His variation (PCSK9Q152H) have low circulating low-density lipoprotein (LDL) cholesterol levels and are therefore protected against cardiovascular disease (CVD). This uncleavable form of pro-PCSK9, however, is retained in the endoplasmic reticulum (ER) of liver hepatocytes where it would be expected to contribute to ER storage disease (ERSD); a heritable condition known to cause systemic ER stress and liver injury. Here, we examined liver function in members of several French-Canadian families known to carry the PCSK9Q152H variation. We report that PCSK9Q152H carriers exhibited marked hypocholesterolemia and normal liver function despite their lifelong state of ER PCSK9 retention. Mechanistically, hepatic overexpression of PCSK9Q152H using adeno-associated viruses in male mice greatly increased the stability of key ER stress response chaperones in liver hepatocytes and unexpectedly protected against ER stress and liver injury rather than to induce them. Our findings show that ER retention of PCSK9 not only reduced CVD risk in patients but may also protect against ERSD and other ER stress-driven conditions of the liver. In summary, we have uncovered a co-chaperone function for PCSK9Q152H that explains its hepatoprotective effects and generated a translational mouse model for further mechanistic insights into this clinically relevant LOF PCSK9 variant.

Authors

Paul F. Lebeau, Hanny Wassef, Jae Hyun Byun, Khrystyna Platko, Brandon Ason, Simon Jackson, Joshua Dobroff, Susan Shetterly, William G. Richards, Ali A. Al-Hashimi, Kevin D. Won, Majambu Mbikay, Annik Prat, An Tang, Guillaume Paré, Renata Pasqualini, Nabil G. Seidah, Wadih Arap, Michel Chretien, Richard C. Austin

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CLIC1 recruits PIP5K1A/C to induce cell-matrix adhesions for tumor metastasis
Jei-Ming Peng, … , Ming-Chin Yu, Sen-Yung Hsieh
Jei-Ming Peng, … , Ming-Chin Yu, Sen-Yung Hsieh
Published October 20, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI133525.
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CLIC1 recruits PIP5K1A/C to induce cell-matrix adhesions for tumor metastasis

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Abstract

Membrane protrusion and adhesion to the extracellular matrix, which involves the extension of actin filaments and formation of adhesion complexes, are the fundamental processes for cell migration, tumor invasion, and metastasis. How cancer cells efficiently coordinate these processes remains unclear. Here, we showed that membrane-targeted CLIC1 spatiotemporally regulates the formation of cell-matrix adhesions and membrane protrusions through the recruitment of PIP5Ks to the plasma membrane. Comparative proteomics identified CLIC1 upregulated in human hepatocellular carcinoma (HCC) and associated with tumor invasiveness, metastasis, and poor prognosis. In response to migration-related stimuli, CLIC1 recruited PIP5K1A and PIP5K1C from the cytoplasm to the leading edge of the plasma membrane, where PIP5Ks generate a PIP2-rich microdomain to induce the formation of integrin-mediated cell-matrix adhesions and the signaling for cytoskeleon extension. CLIC1 silencing inhibited the attachment of tumor cells to culture plates and the adherence and extravasation in the lung alveoli resulting in suppressed lung metastasis in mice. This study reveals an unrecognized mechanism that spatiotemporally coordinates the formation of both lamellipodium/invadopodia and nascent cell-matrix adhesions for directional migration and tumor invasion/metastasis. The unique traits of upregulation and membrane targeting of CLIC1 in cancer cells make it an excellent therapeutic target for tumor metastasis.

Authors

Jei-Ming Peng, Sheng-Hsuan Lin, Ming-Chin Yu, Sen-Yung Hsieh

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Apobec1 complementation factor overexpression promotes hepatic steatosis, fibrosis and hepatocellular cancer
Valerie Blanc, … , Lewis R. Roberts, Nicholas O. Davidson
Valerie Blanc, … , Lewis R. Roberts, Nicholas O. Davidson
Published September 17, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI138699.
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Apobec1 complementation factor overexpression promotes hepatic steatosis, fibrosis and hepatocellular cancer

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Abstract

RNA binding protein Apobec1 Complementation Factor (A1CF) regulates posttranscriptional ApoB mRNA editing but the range of RNA targets and long-term impact of altered A1CF expression on liver function are unknown. Here we studied hepatocyte-specific A1cf transgenic (A1cf +/Tg), A1cf+/Tg Apobec1–/– and A1cf –/– mice fed chow or high fat/high fructose diets using RNA-Seq, RNA-CLIP Seq and tissue microarrays from human hepatocellular cancer (HCC). A1cf +/Tg mice exhibited increased hepatic proliferation and steatosis, with increased lipogenic gene expression (Mogat1, Mogat2, Cidea, Cd36) associated with shifts in polysomal RNA distribution. Aged A1cf +/Tg mice developed spontaneous fibrosis, dysplasia and HCC, which was accelerated on a high fat/fructose diet and independent of Apobec1. RNA-Seq revealed increased expression of mRNAs involved in oxidative stress (Gstm3, Gpx3, Cbr3), inflammatory response (Il19, Cxcl14, Tnfα, Ly6c), extracellular matrix organization (Mmp2, Col1a1, Col4a1), proliferation (Kif20a, Mcm2, Mcm4, Mcm6) with a subset of mRNAs (including Sox4, Sox9, Cdh1) identified in RNA CLIP-Seq. Increased A1CF expression in human HCC correlated with advanced fibrosis and with reduced survival in a subset with nonalcoholic fatty liver disease. In conclusion, we show that hepatic A1CF overexpression selectively alters polysomal distribution and mRNA expression, promoting lipogenic, proliferative and inflammatory pathways leading to HCC.

Authors

Valerie Blanc, Jesse D. Riordan, Saeed Soleymanjahi, Joseph Nadeau, ILKe Nalbantoglu, Yan Xie, Elizabeth A. Molitor, Blair B. Madison, Elizabeth M. Brunt, Jason C. Mills, Deborah C. Rubin, Irene O.L. Ng, Yeonjung Ha, Lewis R. Roberts, Nicholas O. Davidson

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AGER1 downregulation associates with fibrosis in nonalcoholic steatohepatitis and type 2 diabetes
Ali Dehnad, … , Mohammed Ali, Natalie J. Török
Ali Dehnad, … , Mohammed Ali, Natalie J. Török
Published July 13, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI133051.
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AGER1 downregulation associates with fibrosis in nonalcoholic steatohepatitis and type 2 diabetes

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Type 2 diabetes is clinically associated with progressive necroinflammation and fibrosis in nonalcoholic steatohepatitis (NASH). Advanced glycation end-products (AGEs) accumulate during prolonged hyperglycemia, but the mechanistic pathways that lead to accelerated liver fibrosis have not been well defined. In this study, we show that the AGEs clearance receptor AGER1 was downregulated in patients with NASH and diabetes and in our NASH models, whereas the proinflammatory receptor RAGE was induced. These findings were associated with necroinflammatory, fibrogenic, and pro-oxidant activity via the NADPH oxidase 4. Inhibition of AGEs or RAGE deletion in hepatocytes in vivo reversed these effects. We demonstrate that dysregulation of NRF2 by neddylation of cullin 3 was linked to AGER1 downregulation and that induction of NRF2 using an adeno-associated virus–mediated approach in hepatocytes in vivo reversed AGER1 downregulation, lowered the level of AGEs, and improved proinflammatory and fibrogenic responses in mice on a high AGEs diet. In patients with NASH and diabetes or insulin resistance, low AGER1 levels were associated with hepatocyte ballooning degeneration and ductular reaction. Collectively, prolonged exposure to AGEs in the liver promotes an AGER1/RAGE imbalance and consequent redox, inflammatory, and fibrogenic activity in NASH.

Authors

Ali Dehnad, Weiguo Fan, Joy X. Jiang, Sarah R. Fish, Yuan Li, Suvarthi Das, Gergely Mozes, Kimberly A. Wong, Kristin A. Olson, Gregory W. Charville, Mohammed Ali, Natalie J. Török

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Myeloid signature reveals immune contexture and predicts the prognosis of hepatocellular carcinoma
Chong Wu, … , Jin-Hua Huang, Limin Zheng
Chong Wu, … , Jin-Hua Huang, Limin Zheng
Published June 4, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI135048.
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Myeloid signature reveals immune contexture and predicts the prognosis of hepatocellular carcinoma

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Abstract

BACKGROUND. Despite an increasing appreciation of the roles that myeloid cells play in tumor progression and therapy, challenges remain in interpreting the tumor-associated myeloid response balance and its translational value. We aimed to construct a simple and reliable myeloid signature for hepatocellular carcinoma (HCC). METHODS. Using in situ immunohistochemistry, we assessed the distribution of major myeloid subtypes in both peri- and intratumoral regions of HCC. A 2-feature-based, myeloid-specific prognostic signature, named the myeloid response score (MRS), was constructed using an L1-penalized Cox regression model based on data from a training subset (n=244) and in a test subset (n=244), an independent internal (n=341), and two external (n= 94; n=254) cohorts. RESULTS. The MRS and the MRS-based nomograms displayed remarkable discriminatory power, accuracy, and clinical usefulness for predicting recurrence and patient survival, superior to current staging algorithms. Moreover, an increase in MRS was associated with a shift in the myeloid response balance from antitumor to protumor activities, accompanied with enhanced CD8+ T cell exhaustion patterns. Additionally, we provide evidence that the MRS was associated with the efficacy of sorafenib treatment for recurrent HCC. CONCLUSION. We identified and validated a simple myeloid signature for HCC which showed remarkable prognostic potential and may serve as a basis for the stratification of HCC immune subtypes. FUNDING. This work was supported by the National Science and Technology Major Project of China, the National Natural Science Foundation of China, the Science and Information Technology of Guangzhou, the Fundamental Research Funds for the Central Universities, and the China Postdoctoral Science Foundation.

Authors

Chong Wu, Jie Lin, Yulan Weng, Dan-Ni Zeng, Jing Xu, Shufeng Luo, Li Xu, Mingyu Liu, Qiaomin Hua, Chao-Qun Liu, Jin-Qing Li, Jing Liao, Cheng Sun, Jian Zhou, Min-Shan Chen, Chao Liu, Zhenhong Guo, Shi-Mei Zhuang, Jin-Hua Huang, Limin Zheng

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Nonalcoholic fatty liver disease in CLOCK mutant mice
Xiaoyue Pan, … , Joyce Queiroz, M. Mahmood Hussain
Xiaoyue Pan, … , Joyce Queiroz, M. Mahmood Hussain
Published May 12, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI132765.
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Nonalcoholic fatty liver disease in CLOCK mutant mice

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Abstract

Nonalcoholic fatty liver disease (NAFLD) is becoming a major health issue as obesity increases around the world. We studied the effect of a circadian locomotor output cycles kaput (CLOCK) mutant (ClkΔ19/Δ19) protein on hepatic lipid metabolism in C57Bl6 Clkwt/wt and apolipoprotein E–deficient (Apoe−/−) mice. Both ClkΔ19/Δ19 and ClkΔ19/Δ19Apoe−/− mice developed a full spectrum of liver diseases (steatosis, steatohepatitis, cirrhosis, and hepatocellular carcinoma) recognized in human NAFLD when challenged with a Western diet, lipopolysaccharide, or CoCl2. We identified induction of cluster of differentiation 36 (CD36) and hypoxia-inducible factor 1α (HIF1α) proteins as contributing factors for NAFLD. Mechanistic studies showed that wild-type CLOCK protein interacted with the E-box enhancer elements in the promoters of the proline hydroxylase domain (PHD) proteins to increase expression. In ClkΔ19/Δ19 mice, PHD levels were low, and HIF1α protein levels were increased. When its levels were high, HIF1α interacted with the Cd36 promoter to augment expression and enhance fatty acid uptake. Thus, these studies establish a novel regulatory link among circadian rhythms, hypoxia response, fatty acid uptake, and NAFLD. The mouse models described here may be useful for further mechanistic studies in the progression of liver diseases and in the discovery of drugs for the treatment of these disorders.

Authors

Xiaoyue Pan, Joyce Queiroz, M. Mahmood Hussain

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Parental metabolic syndrome epigenetically reprograms offspring hepatic lipid metabolism in mice
Dario F. De Jesus, … , Jussi Pihlajamäki, Rohit N. Kulkarni
Dario F. De Jesus, … , Jussi Pihlajamäki, Rohit N. Kulkarni
Published April 6, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI127502.
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Parental metabolic syndrome epigenetically reprograms offspring hepatic lipid metabolism in mice

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Abstract

The prevalence of nonalcoholic fatty liver disease (NAFLD) is increasing worldwide. Although gene-environment interactions have been implicated in the etiology of several disorders, the impact of paternal and/or maternal metabolic syndrome on the clinical phenotypes of offspring and the underlying genetic and epigenetic contributors of NAFLD have not been fully explored. To this end, we used the liver-specific insulin receptor knockout (LIRKO) mouse, a unique nondietary model manifesting 3 hallmarks that confer high risk for the development of NAFLD: hyperglycemia, insulin resistance, and dyslipidemia. We report that parental metabolic syndrome epigenetically reprograms members of the TGF-β family, including neuronal regeneration–related protein (NREP) and growth differentiation factor 15 (GDF15). NREP and GDF15 modulate the expression of several genes involved in the regulation of hepatic lipid metabolism. In particular, NREP downregulation increases the protein abundance of 3-hydroxy-3-methylglutaryl-CoA reductase (HMGCR) and ATP-citrate lyase (ACLY) in a TGF-β receptor/PI3K/protein kinase B–dependent manner, to regulate hepatic acetyl-CoA and cholesterol synthesis. Reduced hepatic expression of NREP in patients with NAFLD and substantial correlations between low serum NREP levels and the presence of steatosis and nonalcoholic steatohepatitis highlight the clinical translational relevance of our findings in the context of recent preclinical trials implicating ACLY in NAFLD progression.

Authors

Dario F. De Jesus, Kazuki Orime, Dorota Kaminska, Tomohiko Kimura, Giorgio Basile, Chih-Hao Wang, Larissa Haertle, Renzo Riemens, Natalie K. Brown, Jiang Hu, Ville Männistö, Amélia M. Silva, Ercument Dirice, Yu-Hua Tseng, Thomas Haaf, Jussi Pihlajamäki, Rohit N. Kulkarni

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Plasminogen as a prognostic biomarker for HBV-related acute-on-chronic liver failure
Daxian Wu, … , Zeyu Sun, Lanjuan Li
Daxian Wu, … , Zeyu Sun, Lanjuan Li
Published March 16, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI130197.
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Plasminogen as a prognostic biomarker for HBV-related acute-on-chronic liver failure

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BACKGROUND HBV-related acute-on-chronic liver failure (HBV-ACLF) is hallmarked by high short-term mortality rates, calling for accurate prognostic biomarkers for initial risk stratification.METHODS Three tandem mass tag–labeled (TMT-labeled) quantitative proteomic studies were performed on 10 patients with HBV-related acute hepatic decompensation and on 20 patients with HBV-ACLF. Candidate biomarkers were preliminarily verified in a cross-sectional cohort (n = 144) and further confirmed in 2 prospective cohorts (n = 207 and n = 148).RESULTS Plasminogen, a potential prognostic biomarker for HBV-ACLF, was identified by TMT quantitative proteomics and preliminarily verified in the cross-sectional cohort. Further validation with a prospective cohort (n = 207) showed that plasminogen levels at admission were significantly lower (P < 0.001) in HBV-ACLF nonsurvivors than in survivors. The cumulative survival duration of patients with high plasminogen levels was significantly longer (P < 0.001) than that of patients with low plasminogen levels. During hospitalization, plasminogen levels significantly decreased (P = 0.008) in the deterioration group but significantly increased (P < 0.001) in the improvement group. Additionally, plasminogen levels gradually increased in survivors but gradually decreased in nonsurvivors. The P5 score, a prognostic panel incorporating plasminogen levels, hepatic encephalopathy occurrence, age, international normalized ratio (INR), and total bilirubin, was significantly superior to the Child-Pugh, Model for End-stage Liver Disease (MELD), Chronic Liver Failure Consortium ACLF (CLIF-C ACLF), Chinese Group on the Study of Severe Hepatitis B (COSSH), and HINT (a prognostic score based on hepatic encephalopathy occurrence, INR, neutrophil count, and thyroid-stimulating hormone) scores (all P < 0.05). The performances of the plasminogen level and P5 score were validated in a second multicenter, prospective cohort (n = 148).CONCLUSIONS Plasminogen is a promising prognostic biomarker for HBV-ACLF, and sequential plasminogen measurements could profile the clinical course of HBV-ACLF. P5 is a high-performance prognostic score for HBV-ACLF.FUNDING The National Key Research and Development Program (2017YFC1200204); the National Natural Science Foundation of China (81400589, 81600497); the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (81121002); the Chinese High-Tech Research and Development Programs (2012AA020204); the National S&T Major Project (2012ZX10002004); and the Zhejiang Provincial Medicine and Health Science and Technology Project (2016147735).

Authors

Daxian Wu, Sainan Zhang, Zhongyang Xie, Ermei Chen, Qunfang Rao, Xiaoli Liu, Kaizhou Huang, Jing Yang, Lanlan Xiao, Feiyang Ji, Zhengyi Jiang, Yalei Zhao, Xiaoxi Ouyang, Danhua Zhu, Xiahong Dai, Zhouhua Hou, Bingjie Liu, Binbin Deng, Ning Zhou, Hainv Gao, Zeyu Sun, Lanjuan Li

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Tracing biliary cells in liver repair
Simone Jörs, Petia Jeliazkova, and colleagues demonstrate that the ductal compartment is not the main source of liver progenitor cells in response to hepatic injury…
Published April 27, 2015
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The regenerating liver
Claus Kordes and colleagues demonstrate that hepatic stellate cells contribute to liver regeneration…
Published November 17, 2014
Scientific Show StopperHepatology
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