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Li Q, Wang W, Duan F, Wang Y, Chen S, Shi K, Xia Y, Li X, Gao Y, Liu G. DNMT3B Alleviates Liver Steatosis Induced by Chronic Low-grade LPS via Inhibiting CIDEA Expression. Cell Mol Gastroenterol Hepatol 2023; 17:59-77. [PMID: 37703946 PMCID: PMC10665944 DOI: 10.1016/j.jcmgh.2023.09.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 09/02/2023] [Accepted: 09/05/2023] [Indexed: 09/15/2023]
Abstract
BACKGROUND & AIMS Nonalcoholic fatty liver disease is the most prevalent chronic liver disease and threats to human health. Gut dysbiosis caused by lipopolysaccharide (LPS) leakage has been strongly related to nonalcoholic fatty liver disease progression, although the underlying mechanisms remain unclear. METHODS Previous studies have shown that low-grade LPS administration to mice on a standard, low-fat chow diet is sufficient to induce symptoms of fatty liver. This study confirmed these findings and supported LPS as a lipid metabolism regulator in the liver. RESULTS Mechanically, LPS induced dysregulated lipid metabolism by inhibiting the expression of DNA methyltransferases 3B (DNMT3B). Genetic overexpression of DNMT3B alleviated LPS-induced lipid accumulation, whereas its knockdown increased steatosis in mice and human hepatocytes. LPS-induced lower expression of DNMT3B led to hypomethylation in promoter region of CIDEA, resulting in increased binding of SREBP-1c to its promoter and activated CIDEA expression. Hepatic interference of CIDEA reversed the effect of LPS on lipogenesis. These effects were independent of a high-fat diet or high fatty acid action. CONCLUSIONS Overall, these findings sustain the conclusion that LPS is a lipogenic factor and could be involved in hepatic steatosis progression.
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Affiliation(s)
- Qiang Li
- Department of Cell Biology, School of Life Science, Bengbu Medical College, Anhui, China; Anhui Province Key Laboratory of Translational Cancer Research, Bengbu Medical College, Anhui, China.
| | - Wenjing Wang
- Department of Cell Biology, School of Life Science, Bengbu Medical College, Anhui, China
| | - Feifan Duan
- Department of Cell Biology, School of Life Science, Bengbu Medical College, Anhui, China
| | - Yaju Wang
- Department of Cell Biology, School of Life Science, Bengbu Medical College, Anhui, China
| | - Shuya Chen
- Department of Cell Biology, School of Life Science, Bengbu Medical College, Anhui, China
| | - Kangyun Shi
- Department of Cell Biology, School of Life Science, Bengbu Medical College, Anhui, China
| | - Yinyin Xia
- Department of Cell Biology, School of Life Science, Bengbu Medical College, Anhui, China
| | - Xinyu Li
- Department of Cell Biology, School of Life Science, Bengbu Medical College, Anhui, China
| | - Yu Gao
- Department of Cell Biology, School of Life Science, Bengbu Medical College, Anhui, China; Bengbu Medical College Key Laboratory of Cancer Research and Clinical Laboratory Diagnosis, Bengbu Medical College, Bengbu, China
| | - Guoquan Liu
- Anhui Province Key Laboratory of Translational Cancer Research, Bengbu Medical College, Anhui, China; Department of Biochemistry and Molecular Biology, School of Laboratory Medicine, Bengbu Medical College, Anhui, China.
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Murata S, Yamashita H, Kido S, Harada D, Ohtsuru S, Sato N. DYNAMIC METABOLIC CHANGES OBSERVED IN AN LPS-INDUCED SYSTEMIC INFLAMMATION RAT MODEL USING CONTINUOUS LONG-TERM INDIRECT CALORIMETRY EXPERIMENTS. Shock 2023; 60:130-136. [PMID: 37195240 PMCID: PMC10417243 DOI: 10.1097/shk.0000000000002144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Accepted: 05/02/2023] [Indexed: 05/18/2023]
Abstract
ABSTRACT Background : Nutritional management is crucial for severely ill patients. Measuring metabolism is believed to be necessary for the acute sepsis phase to accurately estimate nutrition. Indirect calorimetry (IDC) is assumed to be useful for acute intensive care; however, there are few studies on long-term IDC measurement in patients with systemic inflammation. Methods : Rats were categorized into the LPS received or control groups; LPS rats were categorized into underfeeding (UF), adjusted feeding (AF), and overfeeding (OF) groups. Indirect calorimetry measurement was performed until 72 or 144 h. Body composition was measured at -24 and 72 or 144 h, and tissue weight was measured at 72 or 144 h. Results : Low energy consumption and loss of diurnal variation of resting energy expenditure were observed in the LPS group compared with the control group until 72 h, after which the LPS group recovered. The resting energy expenditure in the OF group was higher than that in the UF and AF groups. In the first phase, low energy consumption was observed in all groups. In the second and third phases, higher energy consumption occurred in the OF group than in the UF and AF groups. In the third phase, diurnal variation recovered in all groups. Muscle atrophy caused body weight loss, but fat tissue loss did not occur. Conclusions : We observed metabolic changes with IDC during the acute systemic inflammation phase owing to differences in calorie intake. This is the first report of long-term IDC measurement using the LPS-induced systemic inflammation rat model.
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Affiliation(s)
- Satoru Murata
- Department of Emergency and Critical Care Medicine, Ehime University Graduate School of Medicine, Toon, Japan
- Department of Primary Care and Emergency Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hayato Yamashita
- Research and Development Center, Otsuka Pharmaceutical Factory, Inc., Osaka, Japan
| | - Satoshi Kido
- Research and Development Center, Otsuka Pharmaceutical Factory, Inc., Osaka, Japan
| | - Daisuke Harada
- Research and Development Center, Otsuka Pharmaceutical Factory, Inc., Osaka, Japan
| | - Shigeru Ohtsuru
- Department of Primary Care and Emergency Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Norio Sato
- Department of Emergency and Critical Care Medicine, Ehime University Graduate School of Medicine, Toon, Japan
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Luo L, Chang Y, Sheng L. Gut-liver axis in the progression of nonalcoholic fatty liver disease: From the microbial derivatives-centered perspective. Life Sci 2023; 321:121614. [PMID: 36965522 DOI: 10.1016/j.lfs.2023.121614] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/16/2023] [Accepted: 03/18/2023] [Indexed: 03/27/2023]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is one of the world's most common chronic liver diseases. However, its pathogenesis remains unclear. With the deepening of research, NAFLD is considered a metabolic syndrome associated with the environment, heredity, and metabolic disorders. Recently, the close relationship between the intestinal microbiome and NAFLD has been discovered, and the theory of the "gut-liver axis" has been proposed. In short, the gut bacteria directly reach the liver via the portal vein through the damaged intestinal wall or indirectly participate in the development of NAFLD through signaling pathways mediated by their components and metabolites. This review focuses on the roles of microbiota-derived lipopolysaccharide, DNA, peptidoglycan, bile acids, short-chain fatty acids, endogenous ethanol, choline and its metabolites, indole and its derivatives, and bilirubin and its metabolites in the progression of NAFLD, which may provide significative insights into the pathogenesis, diagnosis, and treatment for this highly prevalent liver disease.
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Affiliation(s)
- Lijun Luo
- Department of Drug Metabolism, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, PR China; Beijing Key Laboratory of Non-Clinical Drug Metabolism and PK/PD Study, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, PR China.
| | - Yongchun Chang
- Department of Drug Metabolism, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, PR China; Beijing Key Laboratory of Non-Clinical Drug Metabolism and PK/PD Study, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, PR China.
| | - Li Sheng
- Department of Drug Metabolism, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, PR China; Beijing Key Laboratory of Non-Clinical Drug Metabolism and PK/PD Study, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, PR China.
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He Q, Zeng J, Yao K, Wang W, Wu Q, Tang R, Xia X, Zou X. Long-term subcutaneous injection of lipopolysaccharides and high-fat diet induced non-alcoholic fatty liver disease through IKKε/ NF-κB signaling. Biochem Biophys Res Commun 2020; 532:362-369. [PMID: 32883523 DOI: 10.1016/j.bbrc.2020.08.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 08/12/2020] [Indexed: 12/25/2022]
Abstract
Non-alcoholic fatty liver disease (NAFLD) was associated with increased level of lipopolysaccharides (LPS) which mechanism remained unclear on intervention between LPS and NAFLD. The aim was to explore the IKKε/NF-κB role and its intervention of LPS and high-fat diet (HFD) induced NAFLD. Male C57BL/6 mice were fed on high-fat diet (HFD) combined with or without simultaneously subcutaneous injection of LPS for 18 weeks. Body weight , blood biochemistry parameters, inflammatory mediator and liver lipid deposition were measured to evaluate LPS effect on NAFLD. Furthermore, IKKε selective inhibitor amlexanox (AM) was administrated by gavage to HFD + LPS induced mice. The indicators about metabolism and inflammation were examined and qRT-PCR, immunoblotting assay as well as immunohistochemistry were performed to assess IKKε/NF-κB activation and downstream gene expression. This study found that low-dose LPS + HFD aggravated more significant steatosis than simple HFD or high-dose LPS + HFD. Low-dose LPS exacerbated more prominent inflammation profile including increased IKKε and NF-κB expression in liver than HFD. Inhibiting IKKε/NF-κB signaling with amlexanox significantly prevented HFD + LPS induced metabolic disorders and hepatic steatosis. LPS-upregulated gene expression involved in glucolipid metabolism could be downregulated by amlexanox. Thus, the present study confirmed long-term combinational administration of subcutaneous low-dose LPS injection and HFD induced NAFLD model which had more significant phenotype in mice than simple HFD or high-dose LPS-induction. Targeting on IKKε/NF-κB signaling with its inhibitor amlexanox alleviated steatohepatitis, suggesting that IKKε/NF-κB signaling was responsible for effect of LPS and HFD on NAFLD.
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Affiliation(s)
- Qian He
- Department of Geriatrics, The People's Hospital of China Three Gorges University/the First People's Hospital of Yichang, Yichang, 443000, Hubei Province, China
| | - Jun Zeng
- Department of Endocrinology, The People's Hospital of China Three Gorges University/the First People's Hospital of Yichang, Yichang, 443000, Hubei Province, China
| | - Kecheng Yao
- Department of Geriatrics, The People's Hospital of China Three Gorges University/the First People's Hospital of Yichang, Yichang, 443000, Hubei Province, China
| | - Wei Wang
- Department of Endocrinology, The People's Hospital of China Three Gorges University/the First People's Hospital of Yichang, Yichang, 443000, Hubei Province, China
| | - Qiong Wu
- Department of Pediatrics, The People's Hospital of China Three Gorges University/the First People's Hospital of Yichang, Yichang, 443000, Hubei Province, China
| | - Renmin Tang
- Department of Endocrinology, The People's Hospital of China Three Gorges University/the First People's Hospital of Yichang, Yichang, 443000, Hubei Province, China
| | - Xuan Xia
- Department of Physiology and Pathophysiology, College of Medical Sciences, China Three Gorges University, Yichang, 443002, Hubei Province, China; Third-Grade Pharmacological Laboratory on Chinese Medicine Approved By State Administration of Traditional Chinese Medicine, Medical College of China Three Gorges University, Yichang, 443002, Hubei Province, China.
| | - Xiulan Zou
- Department of Geriatrics, The People's Hospital of China Three Gorges University/the First People's Hospital of Yichang, Yichang, 443000, Hubei Province, China; Healthcare Center, The People's Hospital of China Three Gorges University/the First People's Hospital of Yichang, Yichang, 443000, Hubei Province, China.
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Carpino G, Del Ben M, Pastori D, Carnevale R, Baratta F, Overi D, Francis H, Cardinale V, Onori P, Safarikia S, Cammisotto V, Alvaro D, Svegliati-Baroni G, Angelico F, Gaudio E, Violi F. Increased Liver Localization of Lipopolysaccharides in Human and Experimental NAFLD. Hepatology 2020; 72:470-485. [PMID: 31808577 DOI: 10.1002/hep.31056] [Citation(s) in RCA: 194] [Impact Index Per Article: 48.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 11/13/2019] [Indexed: 02/06/2023]
Abstract
BACKGROUND AND AIMS Lipopolysaccharides (LPS) is increased in nonalcoholic fatty liver disease (NAFLD), but its relationship with liver inflammation is not defined. APPROACH AND RESULTS We studied Escherichia coli LPS in patients with biopsy-proven NAFLD, 25 simple steatosis (nonalcoholic fatty liver) and 25 nonalcoholic steatohepatitis (NASH), and in mice with diet-induced NASH. NASH patients had higher serum LPS and hepatocytes LPS localization than controls, which was correlated with serum zonulin and phosphorylated nuclear factor-κB expression. Toll-like receptor 4 positive (TLR4+ ) macrophages were higher in NASH than simple steatosis or controls and correlated with serum LPS. NASH biopsies showed a higher CD61+ platelets, and most of them were TLR4+ . TLR4+ platelets correlated with serum LPS values. In mice with NASH, LPS serum levels and LPS hepatocyte localization were increased compared with control mice and associated with nuclear factor-κB activation. Mice on aspirin developed lower fibrosis and extent compared with untreated ones. Treatment with TLR4 inhibitor resulted in lower liver inflammation in mice with NASH. CONCLUSIONS In NAFLD, Escherichia coli LPS may increase liver damage by inducing macrophage and platelet activation through the TLR4 pathway.
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Affiliation(s)
- Guido Carpino
- Department of Movement, Human and Health Sciences, Division of Health Sciences, University of Rome "Foro Italico,", Rome, Italy
| | - Maria Del Ben
- Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Rome, Italy
| | - Daniele Pastori
- Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Rome, Italy
| | - Roberto Carnevale
- Department of Medico-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Latina, Italy.,Mediterranea Cardiocentro, Naples, Italy
| | - Francesco Baratta
- Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Rome, Italy
| | - Diletta Overi
- Department of Anatomical, Histological, Forensic Medicine and Orthopedics Sciences, Sapienza University of Rome, Rome, Italy
| | - Heather Francis
- Indiana Center for Liver Research, Richard L. Roudebush VA Medical Center and Indiana University, Indianapolis, IN
| | - Vincenzo Cardinale
- Department of Medico-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Latina, Italy
| | - Paolo Onori
- Department of Anatomical, Histological, Forensic Medicine and Orthopedics Sciences, Sapienza University of Rome, Rome, Italy
| | - Samira Safarikia
- Department of Precision and Translational Medicine, Sapienza University of Rome, Rome, Italy
| | - Vittoria Cammisotto
- Department of General Surgery and Surgical Specialty Paride Stefanini, Sapienza University of Rome, Rome, Italy
| | - Domenico Alvaro
- Department of Precision and Translational Medicine, Sapienza University of Rome, Rome, Italy
| | | | - Francesco Angelico
- Department of Public Health and Infectious Diseases, Sapienza University of Rome, Rome, Italy
| | - Eugenio Gaudio
- Department of Anatomical, Histological, Forensic Medicine and Orthopedics Sciences, Sapienza University of Rome, Rome, Italy
| | - Francesco Violi
- Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Rome, Italy.,Mediterranea Cardiocentro, Naples, Italy
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Hepatocyte Injury and Hepatic Stem Cell Niche in the Progression of Non-Alcoholic Steatohepatitis. Cells 2020; 9:cells9030590. [PMID: 32131439 PMCID: PMC7140508 DOI: 10.3390/cells9030590] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 02/21/2020] [Accepted: 02/27/2020] [Indexed: 02/07/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is a chronic liver disease characterized by lipid accumulation in hepatocytes in the absence of excessive alcohol consumption. The global prevalence of NAFLD is constantly increasing. NAFLD is a disease spectrum comprising distinct stages with different prognoses. Non-alcoholic steatohepatitis (NASH) is a progressive condition, characterized by liver inflammation and hepatocyte ballooning, with or without fibrosis. The natural history of NAFLD is negatively influenced by NASH onset and by the progression towards advanced fibrosis. Pathogenetic mechanisms and cellular interactions leading to NASH and fibrosis involve hepatocytes, liver macrophages, myofibroblast cell subpopulations, and the resident progenitor cell niche. These cells are implied in the regenerative trajectories following liver injury, and impairment or perturbation of these mechanisms could lead to NASH and fibrosis. Recent evidence underlines the contribution of extra-hepatic organs/tissues (e.g., gut, adipose tissue) in influencing NASH development by interacting with hepatic cells through various molecular pathways. The present review aims to summarize the role of hepatic parenchymal and non-parenchymal cells, their mutual influence, and the possible interactions with extra-hepatic tissues and organs in the pathogenesis of NAFLD.
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The Crosstalk between Hypoxia and Innate Immunity in the Development of Obesity-Related Nonalcoholic Fatty Liver Disease. BIOMED RESEARCH INTERNATIONAL 2015; 2015:319745. [PMID: 26491664 PMCID: PMC4600870 DOI: 10.1155/2015/319745] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 08/26/2015] [Accepted: 08/30/2015] [Indexed: 02/07/2023]
Abstract
Nonalcoholic fatty liver disease (NAFLD) has become a major health issue in western countries in parallel with the dramatic increase in the prevalence of obesity and all obesity related conditions, including respiratory diseases as obstructive sleep apnea-hypopnea syndrome (OSAHS). Interestingly, the severity of the liver damage in obesity-related NAFLD has been associated with the concomitant presence of OSAHS. In the presence of obesity, the proinflammatory state in these patients together with intermittent episodes of hypoxia, characteristic of OSAHS pathogenesis, may lead to an enhanced inflammatory response mediated by a positive feedback loop mechanism that implicates HIF-1 and NFκB. Thus, the severity of liver involvement in obese NAFLD patients with a concomitant diagnosis of OSAHS could be explained. In this review, we focus on the molecular mechanisms underlying the hepatic response to chronic intermittent hypoxia and its interaction with innate immunity in obesity-related NAFLD.
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Fåk F, Karlsson CLJ, Ahrné S, Molin G, Weström B. Effects of a high-fat diet during pregnancy and lactation are modulated by E. coli in rat offspring. Int J Obes (Lond) 2011; 36:744-51. [PMID: 21730967 DOI: 10.1038/ijo.2011.118] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
OBJECTIVE Microbial manipulations in early life can affect gut development and inflammatory status of the neonate. The maternal diet during pregnancy and lactation also influences the health of the offspring, but the impact of maternal high-fat (HF) feeding along with modulations of the gut microbiota on body weight, fat deposition and gut function in the offspring has been poorly studied. METHODS Rat dams were given access to either an HF or a standard low-fat diet during the last 2 weeks of pregnancy and during lactation and effects on body weight and gastrointestinal function were investigated in the 14-day-old offspring. To elucidate whether bacterial administration to the dam could modulate any effects of the diets in the rat pups, another group of dams were given Escherichia coli in their drinking water. RESULTS Maternal HF feeding resulted in increased body and fat pad weights in the offspring, along with increased levels of the acute-phase protein, haptoglobin and decreased protein content and disaccharidase activities in the small intestine. The addition of E. coli further accentuated these responses in the young rats, which, in addition to higher body weights and increased fat deposition, also showed an increased intestinal permeability and elevated levels of haptoglobin. CONCLUSIONS The present study demonstrates for the first time how bacterial administration to the maternal diet during the neonatal period can affect body weight and fat deposition in the offspring. The results point to a mechanistic link between the gut microbiota, increased intestinal permeability and metabolic endotoxemia, which appear to have led to increased adiposity in the young rats.
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Affiliation(s)
- F Fåk
- Department of Molecular and Clinical Medicine, Sahlgrenska Center for Cardiovascular and Metabolic Research/Wallenberg Laboratory, University of Gothenburg, Gothenburg, Sweden.
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Endotoxin and plasminogen activator inhibitor-1 serum levels associated with nonalcoholic steatohepatitis in children. J Pediatr Gastroenterol Nutr 2010; 50:645-9. [PMID: 20400911 DOI: 10.1097/mpg.0b013e3181c7bdf1] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVES Recent evidence supports a role for endotoxemia in the progression from nonalcoholic fatty liver disease (NAFLD) to nonalcoholic steatohepatitis (NASH). We investigated the association between serum levels of endotoxin, proinflammatory molecules, and histology in children with NAFLD. PATIENTS AND METHODS A total of 40 children, mean age of 11.9 +/- 2.8 years (27 male and 13 female), with biopsy-proven NAFLD were consecutively enrolled. Anthropometrics, blood pressure, and parameters of the metabolic syndrome were collected. Serum levels of endotoxin, plasminogen activator inhibitor-1 (PAI-1), tumor necrosis factor (TNF)-alpha, and interleukin (IL)-6 were measured by an enzyme-linked immunosorbent assay and compared with circulating levels of the same soluble factors in 9 age- and sex-matched normal weight controls (age 11.4 +/- 1.7 years; 6 boys and 3 girls). RESULTS Children with NAFLD had markedly higher serum concentrations of endotoxin (P < 0.01), PAI-1 (P < 0.001), TNF-alpha, and IL-6 (P < 0.05) than control subjects. Endotoxin (P = 0.002), PAI-1, (P < 0.001), IL-6 (P = 0.002), TNF-alpha (P = 0.02), and body mass index (P = 0.03) were significantly associated with a NAFLD activity score >or=5 at the univariate analysis. At the stepwise regression analysis, endotoxin (P < 0.0001) and PAI-1 (P = 0.009) were the most significant predictors for NAFLD activity score. CONCLUSIONS Our findings demonstrate that, apart from TNF-alpha and IL-6, endotoxin and PAI-1 may represent good markers of NASH. They also reinforce the hypothesis that elevated levels of endotoxin may contribute to the progression from NAFLD to NASH.
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Sriram G, Rahib L, He JS, Campos AE, Parr LS, Liao JC, Dipple KM. Global metabolic effects of glycerol kinase overexpression in rat hepatoma cells. Mol Genet Metab 2008; 93:145-59. [PMID: 18029214 PMCID: PMC2702542 DOI: 10.1016/j.ymgme.2007.09.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2007] [Accepted: 09/10/2007] [Indexed: 10/22/2022]
Abstract
Glycerol kinase has several diverse activities in mammalian cells. Glycerol kinase deficiency is a complex, single-gene, inborn error of metabolism wherein no genotype-phenotype correlation has been established. Since glycerol kinase has been suggested to exhibit additional activities than glycerol phosphorylation, expression level perturbation in this enzyme may affect cellular physiology globally. To investigate this possibility, we conducted metabolic investigations of wild-type and two glycerol kinase-overexpressing H4IIE rat hepatoma cell lines constructed in this study. The glycerol kinase-overexpressing cell lines exhibited a significantly higher consumption of carbon sources per cell, suggesting excess carbon expenditure. Furthermore, we quantified intracellular metabolic fluxes by employing stable isotope 13C labeling with a mathematically designed substrate mixture, gas chromatography-mass spectrometry, and comprehensive isotopomer balancing. This flux analysis revealed that the pentose phosphate pathway flux in the glycerol kinase-overexpressing cell lines was 2-fold higher than that in the wild-type, in addition to subtler flux changes in other pathways of carbohydrate metabolism. Furthermore, the activity and transcript level of the lipogenic enzyme glucose-6-phosphate dehydrogenase, the rate-limiting enzyme of the pentose phosphate pathway, were also about 2-fold higher than that of the wild-type; these data corroborate the flux analysis results. This study shows that glycerol kinase affects carbon metabolism globally, possibly through its additional functions, and highlights glycerol kinase's multifaceted role in cellular physiology.
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Affiliation(s)
- Ganesh Sriram
- Department of Human Genetics, David Geffen School of Medicine at UCLA, University of California, Los Angeles, California
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California
| | - Lola Rahib
- Biomedical Engineering Interdepartmental Program, Henry Samueli School of Engineering and Applied Science, University of California, Los Angeles, California
| | - Jian-Sen He
- Department of Human Genetics, David Geffen School of Medicine at UCLA, University of California, Los Angeles, California
| | - Allison E. Campos
- Department of Human Genetics, David Geffen School of Medicine at UCLA, University of California, Los Angeles, California
| | - Lilly S. Parr
- Department of Human Genetics, David Geffen School of Medicine at UCLA, University of California, Los Angeles, California
| | - James C. Liao
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California
- Biomedical Engineering Interdepartmental Program, Henry Samueli School of Engineering and Applied Science, University of California, Los Angeles, California
| | - Katrina M. Dipple
- Department of Human Genetics, David Geffen School of Medicine at UCLA, University of California, Los Angeles, California
- Biomedical Engineering Interdepartmental Program, Henry Samueli School of Engineering and Applied Science, University of California, Los Angeles, California
- Department of Pediatrics, David Geffen School of Medicine at UCLA, and Mattel Children’s Hospital at UCLA, University of California, Los Angeles, California
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12
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Fåk F, Ahrné S, Molin G, Jeppsson B, Weström B. Microbial manipulation of the rat dam changes bacterial colonization and alters properties of the gut in her offspring. Am J Physiol Gastrointest Liver Physiol 2008; 294:G148-54. [PMID: 17962363 DOI: 10.1152/ajpgi.00023.2007] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The impact of an altered bacterial colonization on gut development has not been thoroughly studied, despite the increased risk of certain diseases with a disturbed microbiota after birth. This study was conducted to determine the effect of microbial manipulation, i.e., antibiotic treatment or Escherichia coli exposure, of the dam on bacterial colonization and gut development in the offspring. Pregnant rats were administered either broad-spectrum antibiotics 3 days before parturition or live nonpathogenic E. coli Culture Collection of University of Göteborg, Sweden type strain (CCUG 29300(T)) 1 wk before parturition and up to 14 days of lactation in the drinking water. Cecal bacterial levels, gut growth, intestinal permeability, digestive enzyme levels, and intestinal inflammation were studied in 2-wk-old rats. Pups from dams that were antibiotic-treated had higher densities of Enterobacteriaceae, which correlated with a decreased stomach growth and function, lower pancreatic protein levels, higher intestinal permeability, and increased plasma levels of the acute phase protein, haptoglobin, compared with pups from untreated mothers. Exposure of pregnant/lactating mothers to E. coli CCUG 29300(T), also resulting in increased Enterobacteriaceae levels, gave in the offspring similar results on the stomach and an increased small intestinal growth compared with the control pups. Furthermore, E. coli pups showed increased mucosal disaccharidase activities, increased liver, spleen, and adrenal weights, as well as increased plasma concentrations of haptoglobin. These findings indicate that disturbing the normal bacterial colonization after birth, by increasing the densities of cecal Enterobacteriaceae, appears to have lasting effects on the postnatal microflora, which affects gut growth and function.
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Affiliation(s)
- Frida Fåk
- Department of Cell and Organism Biology, Lund Univ., Helgonavägen 3B, SE-223 62 Lund, Sweden.
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Choi JS, Bae YJ, Lee YA. Comparison of total parenteral nutrition-associated cholestasis according to amino acid mixtures in very low birth weight infants. KOREAN JOURNAL OF PEDIATRICS 2006. [DOI: 10.3345/kjp.2006.49.9.972] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Jin-Sung Choi
- Department of Pediatrics, College of Medicine, Dong-A University, Busan, Korea
| | - Yun-Jin Bae
- Department of Pediatrics, College of Medicine, Dong-A University, Busan, Korea
| | - Young Ah Lee
- Department of Pediatrics, College of Medicine, Dong-A University, Busan, Korea
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