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Grayck MR, McCarthy WC, Solar M, Golden E, Balasubramaniyan N, Zheng L, Sherlock LG, Wright CJ. GSK3β/NF-κB -dependent transcriptional regulation of homeostatic hepatocyte Tnf production. Am J Physiol Gastrointest Liver Physiol 2024; 326:G374-G384. [PMID: 38193163 PMCID: PMC11211040 DOI: 10.1152/ajpgi.00229.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 12/18/2023] [Accepted: 12/23/2023] [Indexed: 01/10/2024]
Abstract
Maintenance of hepatocyte homeostasis plays an important role in mediating the pathogenesis of many diseases. A growing body of literature has established a critical role played by tumor necrosis factor-α (TNFα) in maintaining hepatocyte homeostasis; however, the transcriptional mechanisms underlying constitutive Tnf expression are unknown. Whole liver fractions and primary hepatocytes from adult control C57BL/6 mice and the murine hepatocyte cell line AML12 were assessed for constitutive Tnf expression. Impacts of glycogen synthase kinase-3 β (GSK3β) and nuclear factor κB (NF-κB) inhibition on constitutive Tnf expression were assessed in AML12 cells. Finally, AML12 cell proliferation following GSK3β and NF-κB inhibition was evaluated. Constitutive Tnf gene expression is present in whole liver, primary hepatocytes, and cultured AML12 hepatocytes. Cytokine-induced Tnf gene expression is regulated by NF-κB activation. Pharmacological inhibition of GSK3β resulted in a time- and dose-dependent inhibition of Tnf gene expression. GSK3β inhibition decreased nuclear levels of the NF-κB subunits p65 and p50. We determined that NF-κB transcription factor subunit p65 binds to consensus sequence elements present in the murine TNFα promoter and inhibition of GSK3β decreases binding and subsequent Tnf expression. Finally, AML12 cell growth was significantly reduced following GSK3β and NF-κB inhibition. These results demonstrate that GSK3β and NF-κB are essential for mediating Tnf expression and constitutive hepatocyte cell growth. These findings add to a growing body of literature on TNFα mediated hepatocyte homeostasis and identify novel molecular mechanisms involved in mediating response to various disease states in the liver.NEW & NOTEWORTHY Maintenance of hepatocyte homeostasis plays an important role in controlling the pathogenesis of many diseases. Our findings add to a growing body of literature on tumor necrosis factor-α (TNFα)-mediated hepatocyte homeostasis and identify novel molecular mechanisms involved in regulating this response.
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Affiliation(s)
- Maya R Grayck
- Section of Neonatology, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, United States
| | - William C McCarthy
- Section of Neonatology, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, United States
| | - Mack Solar
- Section of Neonatology, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, United States
| | - Emma Golden
- Section of Neonatology, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, United States
| | - Natarajan Balasubramaniyan
- Section of Neonatology, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, United States
| | - Lijun Zheng
- Section of Neonatology, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, United States
| | - Laura G Sherlock
- Section of Neonatology, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, United States
| | - Clyde J Wright
- Section of Neonatology, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, United States
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Dvořák Z, Poulíková K, Mani S. Indole scaffolds as a promising class of the aryl hydrocarbon receptor ligands. Eur J Med Chem 2021; 215:113231. [PMID: 33582577 DOI: 10.1016/j.ejmech.2021.113231] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 01/24/2021] [Accepted: 01/24/2021] [Indexed: 11/18/2022]
Abstract
The aryl hydrocarbon receptor (AhR), deemed initially as a xenobiotic sensor, plays multiple physiological roles and is involved in various pathophysiological processes and many diseases' etiology. Therefore, the therapeutic and chemopreventive targeting of AhR is a fundamental issue. To date, thousands of structurally diverse ligands of AhR have been identified. The bottleneck in targeting the AhR is that it is a Janus-faced player with beneficial vs. harmful effects in the ligand-specific context. A distinct structural class of the AhR ligands is those with indole-based scaffolds. The present review summarizes the knowledge on the existing indole-derived AhR ligands, comprising natural and dietary compounds, synthetic compounds including clinically used drugs, endogenous intermediary metabolites, and catabolites produced by human microbiota. The examples of novel, indole ring containing, rational design based AhR ligands are presented. The molecular, in vitro, and in vivo effects are described.
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Affiliation(s)
- Zdeněk Dvořák
- Department of Cell Biology and Genetics, Faculty of Science, Palacký University, Šlechtitelů 27, 783 71, Olomouc, Czech Republic.
| | - Karolína Poulíková
- Department of Cell Biology and Genetics, Faculty of Science, Palacký University, Šlechtitelů 27, 783 71, Olomouc, Czech Republic
| | - Sridhar Mani
- Department of Medicine and Genetics, Albert Einstein College of Medicine, Bronx, NY, USA.
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Tao G, Huang J, Moorthy B, Wang C, Hu M, Gao S, Ghose R. Potential role of drug metabolizing enzymes in chemotherapy-induced gastrointestinal toxicity and hepatotoxicity. Expert Opin Drug Metab Toxicol 2020; 16:1109-1124. [PMID: 32841068 PMCID: PMC8059872 DOI: 10.1080/17425255.2020.1815705] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 08/24/2020] [Indexed: 02/06/2023]
Abstract
INTRODUCTION Toxicity of chemotherapy drugs is the leading cause of poor therapeutic outcome in many cancer patients. Gastrointestinal (GI) toxicity and hepatotoxicity are among the most common side effects of current chemotherapies. Emerging studies indicate that many chemotherapy-induced toxicities are driven by drug metabolism, but very few reviews summarize the role of drug metabolism in chemotherapy-induced GI toxicity and hepatotoxicity. In this review, we highlighted the importance of drug metabolizing enzymes (DMEs) in chemotherapy toxicity. AREAS COVERED Our review demonstrated that altered activity of DMEs play important role in chemotherapy-induced GI toxicity and hepatotoxicity. Besides direct changes in catalytic activities, the transcription of DMEs is also affected by inflammation, cell-signaling pathways, and/or by drugs in cancer patients due to the disease etiology. EXPERT OPINION More studies should focus on how DMEs are altered during chemotherapy treatment, and how such changes affect the metabolism of chemotherapy drug itself. This mutual interaction between chemotherapies and DMEs can lead to excessive exposure of parent drug or toxic metabolites which ultimately cause GI adverse effect.
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Affiliation(s)
- Gabriel Tao
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston TX, U.S
| | - Junqing Huang
- Formula-pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, China
| | | | - Cathryn Wang
- Department of Pharmacy Practice and Translational Research, College of Pharmacy, University of Houston, Houston TX, U.S
| | - Ming Hu
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston TX, U.S
| | - Song Gao
- Department of Pharmaceutical and Environmental Health Sciences, Texas Southern University, Houston TX, U.S
| | - Romi Ghose
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston TX, U.S
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Shoemaker JT, Zhang W, Atlas SI, Bryan RA, Inman SW, Vukasinovic J. A 3D Cell Culture Organ-on-a-Chip Platform With a Breathable Hemoglobin Analogue Augments and Extends Primary Human Hepatocyte Functions in vitro. Front Mol Biosci 2020; 7:568777. [PMID: 33195413 PMCID: PMC7645268 DOI: 10.3389/fmolb.2020.568777] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 09/22/2020] [Indexed: 12/17/2022] Open
Abstract
Remarkable advances in three-dimensional (3D) cell cultures and organ-on-a-chip technologies have opened the door to recapitulate complex aspects of human physiology, pathology, and drug responses in vitro. The challenges regarding oxygen delivery, throughput, assay multiplexing, and experimental complexity are addressed to ensure that perfused 3D cell culture organ-on-a-chip models become a routine research tool adopted by academic and industrial stakeholders. To move the field forward, we present a throughput-scalable organ-on-a-chip insert system that requires a single tube to operate 48 statistically independent 3D cell culture organ models. Then, we introduce in-well perfusion to circumvent the loss of cell signaling and drug metabolites in otherwise one-way flow of perfusate. Further, to augment the relevancy of 3D cell culture models in vitro, we tackle the problem of oxygen transport by blood using, for the first time, a breathable hemoglobin analog to improve delivery of respiratory gases to cells, because in vivo approximately 98% of oxygen delivery to cells takes place via reversible binding to hemoglobin. Next, we show that improved oxygenation shifts cellular metabolic pathways toward oxidative phosphorylation that contributes to the maintenance of differentiated liver phenotypes in vitro. Lastly, we demonstrate that the activity of cytochrome P450 family of drug metabolizing enzymes is increased and prolonged in primary human hepatocytes cultured in 3D compared to two-dimensional (2D) cell culture gold standard with important ramifications for drug metabolism, drug-drug interactions and pharmacokinetic studies in vitro.
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Affiliation(s)
| | - Wanrui Zhang
- Lena Biosciences, Inc., Atlanta, GA, United States
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Wahlicht T, Vièyres G, Bruns SA, Meumann N, Büning H, Hauser H, Schmitz I, Pietschmann T, Wirth D. Controlled Functional Zonation of Hepatocytes In Vitro by Engineering of Wnt Signaling. ACS Synth Biol 2020; 9:1638-1649. [PMID: 32551516 DOI: 10.1021/acssynbio.9b00435] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Key liver functions, including protein synthesis, carbohydrate metabolism, and detoxification, are performed by specific populations of hepatocytes that are defined by their relative positions within the liver lobules. On a molecular level, the functional heterogeneity with periportal and pericentral phenotypes, so-called metabolic liver zonation, is mainly established by a gradient of canonical Wnt signaling activity. Since the relevant physiological cues are missing in in vitro liver models, they fail to reflect the functional heterogeneity and thus lack many liver functions. We synthetically re-engineered Wnt signaling in murine and human hepatocytes using a doxycycline-dependent cassette for externally controlled digital expression of stabilized β-catenin. Thereby, we achieved adjustable mosaic-like activation of Wnt signaling in in vitro-cultured hepatocytes that was resistant to negative-feedback loops. This allowed the establishment of long-term-stable periportal-like and pericentral-like phenotypes that mimic the heterogeneity observed in vivo. The in vitro-zonated hepatocytes show differential expression of drug-metabolizing enzymes and associated differential toxicity and higher levels of autophagy. Furthermore, recombinant adeno-associated virus and hepatitis C virus preferentially transduce the pericentral-like zonation phenotype, suggesting a bias of these viruses that has been unappreciated to date. These tightly controlled in vivo-like systems will be important for studies evaluating aspects of liver zonation and for the assessment of drug toxicity for mouse and man.
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Affiliation(s)
- Tom Wahlicht
- Model Systems for Infection and Immunity, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
| | - Gabrielle Vièyres
- Institute of Experimental Virology, TWINCORE, Centre for Experimental and Clinical Infection Research, 30625 Hannover, Germany
| | - Svenja A. Bruns
- Systems-Oriented Immunology and Inflammation Research, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
- Institute for Molecular and Clinical Immunology, Otto von Guericke University Magdeburg, 39106 Magdeburg, Germany
| | - Nadja Meumann
- German Center for Infection Research (DZIF), Hannover−Braunschweig Partner Site, 38124 Braunschweig, Germany
| | - Hildegard Büning
- German Center for Infection Research (DZIF), Hannover−Braunschweig Partner Site, 38124 Braunschweig, Germany
- REBIRTH Cluster of Excellence, Hannover Medical School, 30625 Hannover, Germany
| | - Hansjörg Hauser
- Department of Scientific Strategy, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
| | - Ingo Schmitz
- Systems-Oriented Immunology and Inflammation Research, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
- Institute for Molecular and Clinical Immunology, Otto von Guericke University Magdeburg, 39106 Magdeburg, Germany
| | - Thomas Pietschmann
- Institute of Experimental Virology, TWINCORE, Centre for Experimental and Clinical Infection Research, 30625 Hannover, Germany
| | - Dagmar Wirth
- Model Systems for Infection and Immunity, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
- Institute of Experimental Hematology, Medical University Hannover, 30625 Hannover, Germany
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Huge N, Sandbothe M, Schröder AK, Stalke A, Eilers M, Schäffer V, Schlegelberger B, Illig T, Vajen B, Skawran B. Wnt status-dependent oncogenic role of BCL9 and BCL9L in hepatocellular carcinoma. Hepatol Int 2019; 14:373-384. [PMID: 31440992 PMCID: PMC7220899 DOI: 10.1007/s12072-019-09977-w] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 08/03/2019] [Indexed: 12/13/2022]
Abstract
Background Activation of Wnt/β-catenin pathway is a frequent event in hepatocellular carcinoma and is associated with enhanced cell survival and proliferation. Therefore, targeting this signaling pathway is discussed as an attractive therapeutic approach for HCC treatment. BCL9 and BCL9L, two homologous coactivators of the β-catenin transcription factor complex, have not yet been comprehensively characterized in HCC. We aimed to elucidate the roles of BCL9 and BCL9L, especially regarding Wnt/β-catenin signaling and their prognostic value in HCC. Methods Expression of BCL9/BCL9L was determined in HCC cell lines (HLE, HLF, Huh7, HepG2, Hep3B, and Huh6) and normal liver cell lines (THLE-2 and THLE-3). To analyze proliferation and apoptosis, BCL9 and/or BCL9L were knocked down in Wnt-inactive HLE and Wnt-active HepG2 and Huh6 cells using siRNA. Subsequently, Wnt reporter assays were performed in HepG2 and Huh6 cells. BCL9 and BCL9L expression, clinicopathological and survival data of public HCC datasets were analyzed, taking the Wnt signaling status into account. Results Knockdown of BCL9L, but not of BCL9, reduced Wnt signaling activity. Knockdown of BCL9 and/or BCL9L reduced cell viability and increased apoptosis of Wnt-inactive HCC cells, but had no effect in Wnt-active cells. Expression of BCL9 and BCL9L was upregulated in human HCC and increased with progressing dedifferentiation. For BCL9L, higher expression was observed in tumors of larger size. Overexpression of BCL9 and BCL9L correlated with poor overall survival, especially in HCC without activated Wnt signaling. Conclusion Oncogenic BCL9 proteins represent promising targets for cancer therapy and inhibiting them may be particularly beneficial in Wnt-inactive HCCs. Graphic abstract ![]()
Electronic supplementary material The online version of this article (10.1007/s12072-019-09977-w) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Nicole Huge
- Department of Human Genetics, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover, 30625, Germany
| | - Maria Sandbothe
- Department of Human Genetics, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover, 30625, Germany
| | - Anna K Schröder
- Department of Human Genetics, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover, 30625, Germany
| | - Amelie Stalke
- Department of Human Genetics, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover, 30625, Germany
| | - Marlies Eilers
- Department of Human Genetics, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover, 30625, Germany
| | - Vera Schäffer
- Department of Human Genetics, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover, 30625, Germany
| | - Brigitte Schlegelberger
- Department of Human Genetics, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover, 30625, Germany
| | - Thomas Illig
- Department of Human Genetics, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover, 30625, Germany
| | - Beate Vajen
- Department of Human Genetics, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover, 30625, Germany
| | - Britta Skawran
- Department of Human Genetics, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover, 30625, Germany.
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Ahn J, Ahn JH, Yoon S, Nam YS, Son MY, Oh JH. Human three-dimensional in vitro model of hepatic zonation to predict zonal hepatotoxicity. J Biol Eng 2019; 13:22. [PMID: 30886645 PMCID: PMC6404355 DOI: 10.1186/s13036-019-0148-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 02/11/2019] [Indexed: 01/07/2023] Open
Abstract
Background Various hepatic models mimicking liver lobules have been investigated to evaluate the potential hepatotoxic effects of chemicals and drugs, but in vitro hepatic models of zonal hepatotoxicity have not yet been established. Herein, we developed a three-dimensional (3D) hepatic zonal channel to evaluate zone-specific hepatotoxicity. Based on the perivenous zone-3-like cytochrome P450 (CYP) expression patterns in metabolically active HepaRG cells treated with CHIR99021 (CHIR), which is an inducer of Wnt/β-catenin signaling, this culture model represents a novel tool for exploring hepatic zonation. Results We generated and validated a 3D hepatic zonal channel model in which 3D HepaRG cells were well distributed in agarose hydrogel channels, and a linear gradient of CHIR was generated according to the zonal distance. According to the results from imaging analyses and bioanalytical experiments, acetaminophen (APAP) caused cytotoxicity in the zone-3 region of the 3D hepatic zonal channel, and the levels of nonphosphorylated β-catenin, CYP2E, and apoptotic proteins were remarkably increased in the zone-3-like region. Finally, the applicability of the 3D hepatic zonal channel model for the high-throughput screening of zonal hepatotoxicity was successfully evaluated using hepatotoxic drugs, including tamoxifen, bromobenzene, and APAP. Conclusions The results indicated that tamoxifen induced cytotoxic effects, regardless of the zonal distance, while the zone-3-specific hepatotoxic drugs bromobenzene and APAP induced greater cytotoxic effects on cells in the zone-3-like region. This finding highlights the potential of our 3D hepatic zonation model as a valuable tool for replicating and evaluating zonal hepatotoxicity by mimicking the spatial features of liver lobules. Electronic supplementary material The online version of this article (10.1186/s13036-019-0148-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jaehwan Ahn
- 1Department of Material Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141 Republic of Korea.,2Department of Predictive Toxicology, Korea Institute of Toxicology (KIT), Daejeon, 34114 Republic of Korea
| | - Jun-Ho Ahn
- 2Department of Predictive Toxicology, Korea Institute of Toxicology (KIT), Daejeon, 34114 Republic of Korea
| | - Seokjoo Yoon
- 2Department of Predictive Toxicology, Korea Institute of Toxicology (KIT), Daejeon, 34114 Republic of Korea
| | - Yoon Sung Nam
- 1Department of Material Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141 Republic of Korea
| | - Mi-Young Son
- 3Stem Cell Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141 Republic of Korea.,4Department of Functional Genomics, KRIBB School of Bioscience, Korea University of Science and Technology (UST), Daejeon, 34113 Republic of Korea
| | - Jung-Hwa Oh
- 2Department of Predictive Toxicology, Korea Institute of Toxicology (KIT), Daejeon, 34114 Republic of Korea
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Prokop J, Anzenbacher P, Mrkvicová E, Pavlata L, Zapletalová I, Šťastník O, Martinek P, Kosina P, Anzenbacherová E. In vivo evaluation of effect of anthocyanin-rich wheat on rat liver microsomal drug-metabolizing cytochromes P450 and on biochemical and antioxidant parameters in rats. Food Chem Toxicol 2018; 122:225-233. [DOI: 10.1016/j.fct.2018.10.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 09/27/2018] [Accepted: 10/10/2018] [Indexed: 12/20/2022]
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He L, Li H, Huang N, Zhou X, Tian J, Li T, Wu J, Tian Y, Yin Y, Yao K. Alpha-ketoglutarate suppresses the NF-κB-mediated inflammatory pathway and enhances the PXR-regulated detoxification pathway. Oncotarget 2017; 8:102974-102988. [PMID: 29262538 PMCID: PMC5732704 DOI: 10.18632/oncotarget.16875] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Accepted: 03/17/2017] [Indexed: 01/18/2023] Open
Abstract
Alpha-ketoglutarate (AKG) is a critical nutritional factor in the maintenance of intestinal homeostasis. However, the relative mechanism of AKG has not been well understood. It was recently shown that the interaction between nuclear factor kappa B (NF-κB)-mediated inflammatory pathway and pregnane X receptor (PXR)-regulated detoxification pathway is a check and balance mechanism for keeping the homeostatic state of the intestine, preventing the onset of intestinal inflammation which may lead to cancer. In the current study we used lipopolysaccharide (LPS)-challenged piglet and intestinal porcine epithelial cells-J2 models to investigate the effects of dietary AKG supplementation on the intestinal immune system and PXR regulated target expression. We found that LPS induced significant activation of the NF-κB-mediated inflammatory pathway with concomitant impairment of intestinal nutrient absorption. AKG administration increased intracellular AKG and its metabolite concentrations and enhanced the mRNA expression of alpha-ketoglutarate dehydrogenase in vivo and in vitro. Thus dietary AKG supplementation reversed the adverse effects induced by LPS. We also found a strong inhibitory effects on the NF-κB-mediated inflammatory pathway, especially, in the AKG-treated intestinal tissues, LPS-induced NF-κB phosphorylation was inhibited and TNF-α was suppressed. Interestingly, AKG has potent effects in regulating the PXR and its downstream targets such as CYP3As and CYP2Bs in vivo and in vitro, although AKG is not a known PXR ligand. One potential mechanism for the up-regulation of the PXR pathway is through the down-regulation of NF-κB pathway which in turn de-represses the PXR-regulated target expression. Taken together, our results suggest that AKG improves intestinal immune system through modulating the interaction between PXR and NF-κB. Our findings have important implications for the prevention and treatment of intestinal inflammatory diseases in neonates.
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Affiliation(s)
- Liuqin He
- Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production, Changsha, Hunan 410125, China.,University of Chinese Academy of Sciences, Huairou, Beijing 10008, China
| | - Huan Li
- College of Animal Science and Technology, Hunan Agricultural University, Hunan, Changsha 410128, China
| | - Niu Huang
- College of Animal Science and Technology, Hunan Agricultural University, Hunan, Changsha 410128, China
| | - Xihong Zhou
- Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production, Changsha, Hunan 410125, China
| | - Junquan Tian
- Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production, Changsha, Hunan 410125, China.,University of Chinese Academy of Sciences, Huairou, Beijing 10008, China
| | - Tiejun Li
- Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production, Changsha, Hunan 410125, China.,Hunan Co-Innovation Center of Animal Production Safety, Hunan, Changsha 410128, China
| | - Jing Wu
- College of Animal Science and Technology, Hunan Agricultural University, Hunan, Changsha 410128, China
| | - Yanan Tian
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX 77843, USA
| | - Yulong Yin
- Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production, Changsha, Hunan 410125, China.,Hunan Co-Innovation Center of Animal Production Safety, Hunan, Changsha 410128, China
| | - Kang Yao
- Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production, Changsha, Hunan 410125, China.,Hunan Co-Innovation Center of Animal Production Safety, Hunan, Changsha 410128, China
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Zhang MM, Wang J, Wang XS. One-Pot Three-Component Synthesis of Pyrido[2,3-c]carbazole Derivatives in EtOH under Catalyst-Free Conditions. J Heterocycl Chem 2016. [DOI: 10.1002/jhet.2717] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Mei-Mei Zhang
- School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials; Jiangsu Normal University; Xuzhou Jiangsu 221116 China
| | - Jie Wang
- School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials; Jiangsu Normal University; Xuzhou Jiangsu 221116 China
| | - Xiang-Shan Wang
- School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials; Jiangsu Normal University; Xuzhou Jiangsu 221116 China
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