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Zhou C, Pan X, Huang L, Wu T, Zhao T, Qi J, Wu J, Mukondiwa AV, Tang Y, Luo Y, Tu Q, Huang Z, Niu J. Fibroblast growth factor 21 ameliorates cholestatic liver injury via a hepatic FGFR4-JNK pathway. Biochim Biophys Acta Mol Basis Dis 2024; 1870:166870. [PMID: 37696161 DOI: 10.1016/j.bbadis.2023.166870] [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: 07/05/2023] [Revised: 08/18/2023] [Accepted: 08/30/2023] [Indexed: 09/13/2023]
Abstract
Cholestasis is characterized by hepatic accumulation of cytotoxic bile acids (BAs), which often subsequently leads to liver injury, inflammation, fibrosis, and liver cirrhosis. Fibroblast growth factor 21 (FGF21) is a liver-secreted hormone with pleiotropic effects on the homeostasis of glucose, lipid, and energy metabolism. However, whether hepatic FGF21 plays a role in cholestatic liver injury remains elusive. We found that serum and hepatic FGF21 levels were significantly increased in response to cholestatic liver injury. Hepatocyte-specific deletion of Fgf21 exacerbated hepatic accumulation of BAs, further accentuating liver injury. Consistently, administration of rFGF21 ameliorated cholestatic liver injury caused by α-naphthylisothiocyanate (ANIT) treatment and Mdr2 deficiency. Mechanically, FGF21 activated a hepatic FGFR4-JNK signaling pathway to decrease Cyp7a1 expression, thereby reducing hepatic BAs pool. Our study demonstrates that hepatic FGF21 functions as an adaptive stress-responsive signal to downregulate BA biosynthesis, thereby ameliorating cholestatic liver injury, and FGF21 analogs may represent a candidate therapy for cholestatic liver diseases.
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Affiliation(s)
- Chuanren Zhou
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Xiaomin Pan
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Lei Huang
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Tianzhen Wu
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Tiantian Zhao
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Jie Qi
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China; Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine, Vision and Brain Health), Wenzhou, Zhejiang 325035, China
| | - Jiamin Wu
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Alan Vengai Mukondiwa
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Yuli Tang
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Yongde Luo
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Qi Tu
- Hangzhou Biomedical Research Institute, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China.
| | - Zhifeng Huang
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China; Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine, Vision and Brain Health), Wenzhou, Zhejiang 325035, China.
| | - Jianlou Niu
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China.
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Zhang Z, Zhang Q, Zhang Y, Lou Y, Ge L, Zhang W, Zhang W, Song F, Huang P. Role of sodium taurocholate cotransporting polypeptide (NTCP) in HBV-induced hepatitis: Opportunities for developing novel therapeutics. Biochem Pharmacol 2024; 219:115956. [PMID: 38049009 DOI: 10.1016/j.bcp.2023.115956] [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: 08/23/2023] [Revised: 11/29/2023] [Accepted: 11/29/2023] [Indexed: 12/06/2023]
Abstract
Hepatitis B is an infectious disease caused by the HBV virus. It presents a significant challenge for treatment due to its chronic nature and the potential for developing severe complications, including hepatocirrhosis and hepatocellular carcinoma. These complications not only cause physical and psychological distress to patients but also impose substantial economic and social burdens on both individuals and society as a whole. The internalization of HBV relies on endocytosis and necessitates the involvement of various proteins, including heparin sulfate proteoglycans, epidermal growth factor receptors, and NTCP. Among these proteins, NTCP is pivotal in HBV internalization and is primarily located in the liver's basement membrane. As a transporter of bile acids, NTCP also serves as a receptor facilitating HBV entry into cells. Numerous molecules have been identified to thwart HBV infection by stifling NTCP activity, although only a handful exhibit low IC50 values. In this systematic review, our primary focus dwells on the structure and regulation of NTCP, as well as the mechanism involved in HBV internalization. We underscore recent drug breakthroughs that specifically target NTCP to combat HBV infection. By shedding light on these advances, this review contributes novel insights into developing effective anti-HBV medications.
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Affiliation(s)
- Zhentao Zhang
- Department of Pharmacology, College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, China
| | - Qi Zhang
- Department of Pharmacology, College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, China
| | - Yiwen Zhang
- Center for Clinical Pharmacy, Cancer Center, Department of Pharmacy, Zhejiang Provincial People's Hospital (Affiliated People's Hospital), Hangzhou Medical College, Hangzhou, Zhejiang, China; Key Laboratory of Endocrine Gland Diseases of Zhejiang Province, Hangzhou, China
| | - Yutao Lou
- Department of Pharmacology, College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, China
| | - Luqi Ge
- Department of Pharmacology, College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, China
| | - Wanli Zhang
- Department of Pharmacology, College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, China
| | - Wen Zhang
- Department of Pharmacology, College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, China
| | - Feifeng Song
- Center for Clinical Pharmacy, Cancer Center, Department of Pharmacy, Zhejiang Provincial People's Hospital (Affiliated People's Hospital), Hangzhou Medical College, Hangzhou, Zhejiang, China; Key Laboratory of Endocrine Gland Diseases of Zhejiang Province, Hangzhou, China.
| | - Ping Huang
- Center for Clinical Pharmacy, Cancer Center, Department of Pharmacy, Zhejiang Provincial People's Hospital (Affiliated People's Hospital), Hangzhou Medical College, Hangzhou, Zhejiang, China; Key Laboratory of Endocrine Gland Diseases of Zhejiang Province, Hangzhou, China.
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Chen X, Li H, Liu Y, Qi J, Dong B, Huang S, Zhao S, Zhu Y. Dimethyl Sulfoxide Inhibits Bile Acid Synthesis in Healthy Mice but Does Not Protect Mice from Bile-Acid-Induced Liver Damage. BIOLOGY 2023; 12:1105. [PMID: 37626991 PMCID: PMC10452260 DOI: 10.3390/biology12081105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 07/23/2023] [Accepted: 08/07/2023] [Indexed: 08/27/2023]
Abstract
Bile acids serve a vital function in lipid digestion and absorption; however, their accumulation can precipitate liver damage. In our study, we probed the effects of dimethyl sulfoxide (DMSO) on bile acid synthesis and the ensuing liver damage in mice induced by bile acids. Our findings indicate that DMSO efficaciously curbs bile acid synthesis by inhibiting key enzymes involved in the biosynthetic pathway, both in cultured primary hepatocytes and in vivo. Contrarily, we observed that DMSO treatment did not confer protection against bile-acid-induced liver damage in two distinct mouse models: one induced by a 0.1% DDC diet, leading to bile duct obstruction, and another induced by a CDA-HFD, resulting in non-alcoholic steatohepatitis (NASH). Histopathological and biochemical analyses unveiled a comparable extent of liver injury and fibrosis levels in DMSO-treated mice, characterized by similar levels of increase in Col1a1 and Acta2 expression and equivalent total liver collagen levels. These results suggest that, while DMSO can promptly inhibit bile acid synthesis in healthy mice, compensatory mechanisms might rapidly override this effect, negating any protective impact against bile-acid-induced liver damage in mice. Through these findings, our study underscores the need to reconsider treating DMSO as a mere inert solvent and prompts further exploration to identify more effective therapeutic strategies for the prevention and treatment of bile-acid-associated liver diseases.
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Affiliation(s)
- Xi Chen
- USDA/ARS Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Huiqiao Li
- USDA/ARS Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Yu’e Liu
- Tongji University Cancer Center, Shanghai Tenth People’s Hospital of Tongji University, School of Medicine, Tongji University, Shanghai 200092, China
| | - Jing Qi
- Department of Emergency, The Third Xiangya Hospital of Central South University, Changsha 410013, China;
| | - Bingning Dong
- Gastroenterology, Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
| | - Shixia Huang
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Shangang Zhao
- Barshop Institute for Longevity and Aging Studies, Division of Endocrinology, Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | - Yi Zhu
- USDA/ARS Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA
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Meadows V, Yang Z, Basaly V, Guo GL. FXR Friend-ChIPs in the Enterohepatic System. Semin Liver Dis 2023; 43:267-278. [PMID: 37442156 PMCID: PMC10620036 DOI: 10.1055/a-2128-5538] [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] [Indexed: 07/15/2023]
Abstract
Chronic liver diseases encompass a wide spectrum of hepatic maladies that often result in cholestasis or altered bile acid secretion and regulation. Incidence and cost of care for many chronic liver diseases are rising in the United States with few Food and Drug Administration-approved drugs available for patient treatment. Farnesoid X receptor (FXR) is the master regulator of bile acid homeostasis with an important role in lipid and glucose metabolism and inflammation. FXR has served as an attractive target for management of cholestasis and fibrosis; however, global FXR agonism results in adverse effects in liver disease patients, severely affecting quality of life. In this review, we highlight seminal studies and recent updates on the FXR proteome and identify gaps in knowledge that are essential for tissue-specific FXR modulation. In conclusion, one of the greatest unmet needs in the field is understanding the underlying mechanism of intestinal versus hepatic FXR function.
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Affiliation(s)
- Vik Meadows
- Department of Pharmacology and Toxicology, Rutgers University, Piscataway, New Jersey
- Environmental and Occupational Health Science Institute, Rutgers University, Piscataway, New Jersey
| | - Zhenning Yang
- Department of Pharmacology and Toxicology, Rutgers University, Piscataway, New Jersey
- Environmental and Occupational Health Science Institute, Rutgers University, Piscataway, New Jersey
| | - Veronia Basaly
- Department of Pharmacology and Toxicology, Rutgers University, Piscataway, New Jersey
- Environmental and Occupational Health Science Institute, Rutgers University, Piscataway, New Jersey
| | - Grace L. Guo
- Department of Pharmacology and Toxicology, Rutgers University, Piscataway, New Jersey
- Environmental and Occupational Health Science Institute, Rutgers University, Piscataway, New Jersey
- Department of Veterans Affairs, New Jersey Health Care System, East Orange, New Jersey
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5
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Lvova MN, Ponomarev DV, Tarasenko AA, Kovner AV, Minkova GA, Tsyganov MA, Li M, Lou Y, Evseenko VI, Dushkin AV, Sorokina IV, Tolstikova TG, Mordvinov VA, Avgustinovich DF. Curcumin and Its Supramolecular Complex with Disodium Glycyrrhizinate as Potential Drugs for the Liver Fluke Infection Caused by Opisthorchis felineus. Pathogens 2023; 12:819. [PMID: 37375509 DOI: 10.3390/pathogens12060819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 06/06/2023] [Accepted: 06/07/2023] [Indexed: 06/29/2023] Open
Abstract
Opisthorchiosis is a parasitic liver disease found in mammals that is widespread throughout the world and causes systemic inflammation. Praziquantel remains the drug of choice for the treatment of opisthorchiosis, despite its many adverse effects. An anthelmintic effect is attributed to the main curcuminoid of Curcuma longa L. roots-curcumin (Cur)-along with many other therapeutic properties. To overcome the poor solubility of curcumin in water, a micellar complex of curcumin with the disodium salt of glycyrrhizic acid (Cur:Na2GA, molar ratio 1:1) was prepared via solid-phase mechanical processing. In vitro experiments revealed a noticeable immobilizing effect of curcumin and of Cur:Na2GA on mature and juvenile Opisthorchis felineus individuals. In vivo experiments showed that curcumin (50 mg/kg) had an anthelmintic effect after 30 days of administration to O. felineus-infected hamsters, but the effect was weaker than that of a single administration of praziquantel (400 mg/kg). Cur:Na2GA (50 mg/kg, 30 days), which contains less free curcumin, did not exert this action. The complex, just as free curcumin or better, activated the expression of bile acid synthesis genes (Cyp7A1, Fxr, and Rxra), which was suppressed by O. felineus infection and by praziquantel. Curcumin reduced the rate of inflammatory infiltration, whereas Cur:Na2GA reduced periductal fibrosis. Immunohistochemically, a decrease in liver inflammation markers was found, which is determined by calculating the numbers of tumor-necrosis-factor-positive cells during the curcumin treatment and of kynurenine-3-monooxygenase-positive cells during the Cur:Na2GA treatment. A biochemical blood test revealed a normalizing effect of Cur:Na2GA (comparable to that of curcumin) on lipid metabolism. We believe that the further development and investigation of therapeutics based on curcuminoids in relation Opisthorchis felineus and other trematode infections will be useful for clinical practice and veterinary medicine.
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Affiliation(s)
- Maria N Lvova
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Denis V Ponomarev
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Alena A Tarasenko
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Anna V Kovner
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Galina A Minkova
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Michail A Tsyganov
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Meijun Li
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Yan Lou
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Veronica I Evseenko
- Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Alexander V Dushkin
- Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Irina V Sorokina
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Tatiana G Tolstikova
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Viatcheslav A Mordvinov
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Damira F Avgustinovich
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
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4-Methylumbelliferone Targets Revealed by Public Data Analysis and Liver Transcriptome Sequencing. Int J Mol Sci 2023; 24:ijms24032129. [PMID: 36768453 PMCID: PMC9917189 DOI: 10.3390/ijms24032129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 01/09/2023] [Accepted: 01/18/2023] [Indexed: 01/25/2023] Open
Abstract
4-methylumbelliferone (4MU) is a well-known hyaluronic acid synthesis inhibitor and an approved drug for the treatment of cholestasis. In animal models, 4MU decreases inflammation, reduces fibrosis, and lowers body weight, serum cholesterol, and insulin resistance. It also inhibits tumor progression and metastasis. The broad spectrum of effects suggests multiple and yet unknown targets of 4MU. Aiming at 4MU target deconvolution, we have analyzed publicly available data bases, including: 1. Small molecule library Bio Assay screening (PubChemBioAssay); 2. GO pathway databases screening; 3. Protein Atlas Database. We also performed comparative liver transcriptome analysis of mice on normal diet and mice fed with 4MU for two weeks. Potential targets of 4MU public data base analysis fall into two big groups, enzymes and transcription factors (TFs), including 13 members of the nuclear receptor superfamily regulating lipid and carbohydrate metabolism. Transcriptome analysis revealed changes in the expression of genes involved in bile acid metabolism, gluconeogenesis, and immune response. It was found that 4MU feeding decreased the accumulation of the glycogen granules in the liver. Thus, 4MU has multiple targets and can regulate cell metabolism by modulating signaling via nuclear receptors.
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Lu ZN, He HW, Zhang N. Advances in understanding the regulatory mechanism of organic solute transporter α-β. Life Sci 2022; 310:121109. [DOI: 10.1016/j.lfs.2022.121109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 10/09/2022] [Accepted: 10/17/2022] [Indexed: 11/07/2022]
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Horváth G, Balterer B, Micsonai A, Kardos J, Toke O. Multiple Timescale Dynamic Analysis of Functionally-Impairing Mutations in Human Ileal Bile Acid-Binding Protein. Int J Mol Sci 2022; 23:ijms231911346. [PMID: 36232642 PMCID: PMC9569817 DOI: 10.3390/ijms231911346] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 09/16/2022] [Accepted: 09/20/2022] [Indexed: 11/16/2022] Open
Abstract
Human ileal bile acid-binding protein (hI-BABP) has a key role in the enterohepatic circulation of bile salts. Its two internal binding sites exhibit positive cooperativity accompanied by a site-selectivity of glycocholate (GCA) and glycochenodeoxycholate (GCDA), the two most abundant bile salts in humans. To improve our understanding of the role of dynamics in ligand binding, we introduced functionally impairing single-residue mutations at two key regions of the protein and subjected the mutants to NMR relaxation analysis and MD simulations. According to our results, mutation in both the vicinity of the C/D (Q51A) and the G/H (Q99A) turns results in a redistribution of motional freedom in apo hI-BABP. Mutation Q51A, deteriorating the site-selectivity of GCA and GCDA, results in the channeling of ms fluctuations into faster motions in the binding pocket hampering the realization of key side chain interactions. Mutation Q99A, abolishing positive binding cooperativity for GCDA, leaves ms motions in the C-terminal half unchanged but by decoupling βD from a dynamic cluster of the N-terminal half displays an increased flexibility in the vicinity of site 1. MD simulations of the variants indicate structural differences in the portal region and mutation-induced changes in dynamics, which depend on the protonation state of histidines. A dynamic coupling between the EFGH portal, the C/D-region, and the helical cap is evidenced highlighting the interplay of structural and dynamic effects in bile salt recognition in hI-BABP.
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Affiliation(s)
- Gergő Horváth
- NMR Research Laboratory, Centre for Structural Science, Research Centre for Natural Sciences, 2 Magyar Tudósok Körútja, H-1117 Budapest, Hungary
| | - Bence Balterer
- NMR Research Laboratory, Centre for Structural Science, Research Centre for Natural Sciences, 2 Magyar Tudósok Körútja, H-1117 Budapest, Hungary
| | - András Micsonai
- ELTE NAP Neuroimmunology Research Group, Department of Biochemistry, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, H-1117 Budapest, Hungary
| | - József Kardos
- ELTE NAP Neuroimmunology Research Group, Department of Biochemistry, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/C, H-1117 Budapest, Hungary
| | - Orsolya Toke
- NMR Research Laboratory, Centre for Structural Science, Research Centre for Natural Sciences, 2 Magyar Tudósok Körútja, H-1117 Budapest, Hungary
- Correspondence: ; Tel.: +36-1-382-6575
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Chiang JYL, Ferrell JM. Discovery of farnesoid X receptor and its role in bile acid metabolism. Mol Cell Endocrinol 2022; 548:111618. [PMID: 35283218 PMCID: PMC9038687 DOI: 10.1016/j.mce.2022.111618] [Citation(s) in RCA: 56] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Revised: 01/07/2022] [Accepted: 01/18/2022] [Indexed: 12/14/2022]
Abstract
In 1995, the nuclear hormone orphan receptor farnesoid X receptor (FXR, NR1H4) was identified as a farnesol receptor expressed mainly in liver, kidney, and adrenal gland of rats. In 1999, bile acids were identified as endogenous FXR ligands. Subsequently, FXR target genes involved in the regulation of hepatic bile acid synthesis, secretion, and intestinal re-absorption were identified. FXR signaling was proposed as a mechanism of feedback regulation of the rate-limiting enzyme for bile acid synthesis, cholesterol 7⍺-hydroxylase (CYP7A1). The primary bile acids synthesized in the liver are transformed to secondary bile acids by the gut microbiota. The gut-to-liver axis plays a critical role in the regulation of bile acid synthesis, composition and circulating bile acid pool size, which in turn regulates glucose, lipid, and energy metabolism. Dysregulation of bile acid metabolism and FXR signaling in the gut-to-liver axis contributes to metabolic diseases including obesity, diabetes, and non-alcoholic fatty liver disease. This review will cover the discovery of FXR as a bile acid sensor in the regulation of bile acid metabolism and as a metabolic regulator of lipid, glucose, and energy homeostasis. It will also provide an update of FXR functions in the gut-to-liver axis and the drug therapies targeting bile acids and FXR for the treatment of liver metabolic diseases.
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Affiliation(s)
- John Y L Chiang
- Department of Integrative Medical Sciences, Northeast Ohio Medical University, 4029 SR 44, P.O. Box 95, Rootstown, OH, 44272, United States.
| | - Jessica M Ferrell
- Department of Integrative Medical Sciences, Northeast Ohio Medical University, 4029 SR 44, P.O. Box 95, Rootstown, OH, 44272, United States
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Tagawa R, Kobayashi M, Sakurai M, Yoshida M, Kaneko H, Mizunoe Y, Nozaki Y, Okita N, Sudo Y, Higami Y. Long-Term Dietary Taurine Lowers Plasma Levels of Cholesterol and Bile Acids. Int J Mol Sci 2022; 23:ijms23031793. [PMID: 35163722 PMCID: PMC8836270 DOI: 10.3390/ijms23031793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2021] [Revised: 01/29/2022] [Accepted: 02/02/2022] [Indexed: 11/16/2022] Open
Abstract
Cholesterol is an essential lipid in vertebrates, but excess blood cholesterol promotes atherosclerosis. In the liver, cholesterol is metabolized to bile acids by cytochrome P450, family 7, subfamily a, polypeptide 1 (CYP7A1), the transcription of which is negatively regulated by the ERK pathway. Fibroblast growth factor 21 (FGF21), a hepatokine, induces ERK phosphorylation and suppresses Cyp7a1 transcription. Taurine, a sulfur-containing amino acid, reportedly promotes cholesterol metabolism and lowers blood and hepatic cholesterol levels. However, the influence of long-term feeding of taurine on cholesterol levels and metabolism remains unclear. Here, to evaluate the more chronic effects of taurine on cholesterol levels, we analyzed mice fed a taurine-rich diet for 14-16 weeks. Long-term feeding of taurine lowered plasma cholesterol and bile acids without significantly changing other metabolic parameters, but hardly affected these levels in the liver. Moreover, taurine upregulated Cyp7a1 levels, while downregulated phosphorylated ERK and Fgf21 levels in the liver. Likewise, taurine-treated Hepa1-6 cells, a mouse hepatocyte line, exhibited downregulated Fgf21 levels and upregulated promoter activity of Cyp7a1. These results indicate that taurine promotes cholesterol metabolism by suppressing the FGF21/ERK pathway followed by upregulating Cyp7a1 expression. Collectively, this study shows that long-term feeding of taurine lowers both plasma cholesterol and bile acids, reinforcing that taurine effectively prevents hypercholesterolemia.
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Affiliation(s)
- Ryoma Tagawa
- Department of Medicinal and Life Sciences, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Chiba 278-8510, Japan; (R.T.); (M.S.); (M.Y.); (H.K.); (Y.N.); (Y.S.)
| | - Masaki Kobayashi
- Department of Medicinal and Life Sciences, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Chiba 278-8510, Japan; (R.T.); (M.S.); (M.Y.); (H.K.); (Y.N.); (Y.S.)
- Correspondence: (M.K.); (Y.H.); Tel.: +81-4-7121-3676 (M.K.); +81-4-7121-3675 (Y.H.)
| | - Misako Sakurai
- Department of Medicinal and Life Sciences, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Chiba 278-8510, Japan; (R.T.); (M.S.); (M.Y.); (H.K.); (Y.N.); (Y.S.)
| | - Maho Yoshida
- Department of Medicinal and Life Sciences, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Chiba 278-8510, Japan; (R.T.); (M.S.); (M.Y.); (H.K.); (Y.N.); (Y.S.)
| | - Hiroki Kaneko
- Department of Medicinal and Life Sciences, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Chiba 278-8510, Japan; (R.T.); (M.S.); (M.Y.); (H.K.); (Y.N.); (Y.S.)
| | - Yuhei Mizunoe
- Department of Internal Medicine Endocrinology and Metabolism, Faculty of Medicine, University of Tsukuba, Tsukuba 305-8575, Japan;
| | - Yuka Nozaki
- Department of Medicinal and Life Sciences, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Chiba 278-8510, Japan; (R.T.); (M.S.); (M.Y.); (H.K.); (Y.N.); (Y.S.)
| | - Naoyuki Okita
- Division of Pathological Biochemistry, Faculty of Pharmaceutical Sciences, Sanyo-Onoda City University, Yamaguchi 756-0884, Japan;
| | - Yuka Sudo
- Department of Medicinal and Life Sciences, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Chiba 278-8510, Japan; (R.T.); (M.S.); (M.Y.); (H.K.); (Y.N.); (Y.S.)
| | - Yoshikazu Higami
- Department of Medicinal and Life Sciences, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Chiba 278-8510, Japan; (R.T.); (M.S.); (M.Y.); (H.K.); (Y.N.); (Y.S.)
- Division of Integrated Research, Research Institute for Biomedical Sciences, Tokyo University of Science, Chiba 278-0022, Japan
- Correspondence: (M.K.); (Y.H.); Tel.: +81-4-7121-3676 (M.K.); +81-4-7121-3675 (Y.H.)
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Toke O. Structural and Dynamic Determinants of Molecular Recognition in Bile Acid-Binding Proteins. Int J Mol Sci 2022; 23:ijms23010505. [PMID: 35008930 PMCID: PMC8745080 DOI: 10.3390/ijms23010505] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/30/2021] [Accepted: 12/31/2021] [Indexed: 12/12/2022] Open
Abstract
Disorders in bile acid transport and metabolism have been related to a number of metabolic disease states, atherosclerosis, type-II diabetes, and cancer. Bile acid-binding proteins (BABPs), a subfamily of intracellular lipid-binding proteins (iLBPs), have a key role in the cellular trafficking and metabolic targeting of bile salts. Within the family of iLBPs, BABPs exhibit unique binding properties including positive binding cooperativity and site-selectivity, which in different tissues and organisms appears to be tailored to the local bile salt pool. Structural and biophysical studies of the past two decades have shed light on the mechanism of bile salt binding at the atomic level, providing us with a mechanistic picture of ligand entry and release, and the communication between the binding sites. In this review, we discuss the emerging view of bile salt recognition in intestinal- and liver-BABPs, with examples from both mammalian and non-mammalian species. The structural and dynamic determinants of the BABP-bile–salt interaction reviewed herein set the basis for the design and development of drug candidates targeting the transcellular traffic of bile salts in enterocytes and hepatocytes.
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Affiliation(s)
- Orsolya Toke
- Laboratory for NMR Spectroscopy, Structural Research Centre, Research Centre for Natural Sciences, 2 Magyar Tudósok Körútja, H-1117 Budapest, Hungary
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12
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Helmrich N, Roderfeld M, Baier A, Windhorst A, Herebian D, Mayatepek E, Dierkes C, Ocker M, Glebe D, Christ B, Churin Y, Irungbam K, Roeb E. Pharmacologic Antagonization of Cannabinoid Receptor 1 Improves Cholestasis in Abcb4 -/- Mice. Cell Mol Gastroenterol Hepatol 2021; 13:1041-1055. [PMID: 34954190 PMCID: PMC8873597 DOI: 10.1016/j.jcmgh.2021.12.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 11/26/2021] [Accepted: 12/14/2021] [Indexed: 02/08/2023]
Abstract
BACKGROUND & AIMS The endocannabinoid system is involved in the modulation of inflammatory, fibrotic, metabolic, and carcinogenesis-associated signaling pathways via cannabinoid receptor (CB)1 and CB2. We hypothesized that the pharmacologic antagonization of CB1 receptor improves cholestasis in Abcb4-/- mice. METHODS After weaning, male Abcb4-/- mice were treated orally with rimonabant (a specific antagonist of CB1) or ACEA (an agonist of CB1) until up to 16 weeks of age. Liver tissue and serum were isolated and examined by means of serum analysis, quantitative real time polymerase chain reaction, Western blot, immunohistochemistry, and enzyme function. Untreated Abcb4-/- and Bagg Albino Mouse/c wild-type mice served as controls. RESULTS Cholestasis-induced symptoms such as liver damage, bile duct proliferation, and enhanced circulating bile acids were improved by CB1 antagonization. Rimonabant treatment also improved Phosphoenolpyruvat-Carboxykinase expression and reduced inflammation and the acute-phase response. The carcinogenesis-associated cellular-Jun N-terminal kinase/cellular-JUN and signal transducer and activator of transcription 3 signaling pathways activated in Abcb4-/- mice were reduced to wild-type level by CB1 antagonization. CONCLUSIONS We showed a protective effect of oral CB1 antagonization in chronic cholestasis using the established Abcb4-/- model. Our results suggest that pharmacologic antagonization of the CB1 receptor could have a therapeutic benefit in cholestasis-associated metabolic changes, liver damage, inflammation, and carcinogenesis.
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Affiliation(s)
| | | | - Anne Baier
- Department of Gastroenterology, Giessen, Germany
| | - Anita Windhorst
- Institute for Medical Informatics, Justus Liebig University, Giessen, Germany
| | - Diran Herebian
- Department of General Pediatrics, Neonatology and Pediatric Cardiology, Medical Faculty, University Hospital Duesseldorf, Heinrich Heine University, Duesseldorf, Germany
| | - Ertan Mayatepek
- Department of General Pediatrics, Neonatology and Pediatric Cardiology, Medical Faculty, University Hospital Duesseldorf, Heinrich Heine University, Duesseldorf, Germany
| | - Christian Dierkes
- Medizinisches Versorgungszentrum for Pathology, Justus Liebig University Giessen, Trier, Germany
| | - Matthias Ocker
- Institute for Surgical Research, Philipps University of Marburg, Marburg, Germany
| | - Dieter Glebe
- Institute of Medical Virology, National Reference Centre for Hepatitis B Viruses and Hepatitis D Viruses, Justus Liebig University, Giessen, Germany
| | - Bruno Christ
- Applied Molecular Hepatology Laboratory, Department of Visceral, Transplant, Thoracic and Vascular Surgery, University of Leipzig Medical Center, Leipzig, Germany
| | - Yuri Churin
- Department of Gastroenterology, Giessen, Germany
| | | | - Elke Roeb
- Department of Gastroenterology, Giessen, Germany,Correspondence Address correspondence to: Elke Roeb, MD, MHAC, Department of Gastroenterology, Justus Liebig University Giessen, University Hospital Universitätsklinikum Giessen und Marburg (UKGM), Klinikstrasse 33, 35392 Giessen, Germany. fax: (49) 641-985-42339.
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13
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Cooked Black Turtle Beans Ameliorate Insulin Resistance and Restore Gut Microbiota in C57BL/6J Mice on High-Fat Diets. Foods 2021; 10:foods10081691. [PMID: 34441468 PMCID: PMC8393191 DOI: 10.3390/foods10081691] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 07/07/2021] [Accepted: 07/19/2021] [Indexed: 01/06/2023] Open
Abstract
Colored common beans are associated with health promoting and chronic disease prevention effects. Male C57BL/6J mice were fed high-fat (HF) diets supplemented with cooked black turtle beans (HFB) to prevent obesity related insulin resistance. Mice on both HF and HFB were obese compared to mice fed a low-fat (LF) diet. Plasma low density lipoprotein (LDL) and triglyceride concentrations of mice fed HFB diet were 28% and 36.6% lower than those on HF diet. Homeostatic model assessment of insulin resistance (HOMA-IR) index of mice fed HFB diet was 87% lower than that of mice fed HF diet. Diabetes related biomarkers, gastric inhibitory polypeptide (GIP), leptin, glucagon, and inflammatory cytokines interleukin 4 (IL-4) and IL-5, 10 and 12, IFN-g and TNF-α were significantly affected by HFB diet. Pparα, Cyp7a1 and Fasn were down-regulated by HFB diet while LDL-R, Srebp-2, Adipoq and Slc2a4 were up-regulated by HFB diet. The ratio of Firmicutes/Bacteroidetes (F/B) was also decreased 64.1% by HFB diet compared to HF diet. The results indicated that cooked black turtle bean consumption could ameliorate insulin resistance and lower plasma LDL in mice fed HF diet through glucose signaling pathway and JNK/c-Jun pathway. Meanwhile, cooked black turtle bean consumption restored the gut microbiome.
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14
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Peng W, Dai MY, Bao LJ, Zhu WF, Li F. FXR activation prevents liver injury induced by Tripterygium wilfordii preparations. Xenobiotica 2021; 51:716-727. [PMID: 33704005 DOI: 10.1080/00498254.2021.1900626] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Tripterygium glycosides tablets (TGT) and Tripterygium wilfordii tablets (TWT) are the preparations of Tripterygium wilfordii used to treat rheumatoid arthritis (RA) in the clinic, but the hepatotoxicity was reported frequently. This study aimed to determine the potential toxicity mechanism of liver injury induced by the preparations of Tripterygium wilfordii in mice.Here, we performed metabolomic analysis, pathological analysis and biochemical analysis of samples from mice with liver injury induced by TGT and TWT, which revealed that liver injury was associated with bile acid metabolism disorder. Quantitative real-time PCR (QPCR) and western blot indicated that the above changes were accompanied by inhibition of farnesoid X receptor (FXR) signalling.Liver injury from TWT could be alleviated by treatment of the FXR agonist obeticholic acid (OCA) via activation of the FXR to inhibit the c-Jun N-terminal kinase (JNK) pathway and improve bile acid metabolism disorder by activating bile salt export pump (BSEP) and organic solute-transporter-β (OSTB). The data demonstrate that FXR signalling pathway plays a key role in T. wilfordii-induced liver injury, which could be alleviated by activated FXR.These results indicate that FXR activation by OCA may offer a promising therapeutic opportunity against hepatotoxicity from the preparations of T. wilfordii.
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Affiliation(s)
- Wan Peng
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.,University of Chinese Academy of Sciences, Beijing, China.,Laboratory of Metabolomics and Drug-Induced Liver Injury, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, China
| | - Man-Yun Dai
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.,University of Chinese Academy of Sciences, Beijing, China.,Laboratory of Metabolomics and Drug-Induced Liver Injury, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, China
| | - Li-Juan Bao
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.,University of Chinese Academy of Sciences, Beijing, China.,School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, Shaanxi Province, China
| | - Wei-Feng Zhu
- Academician Workstation, Jiangxi University of Traditional Chinese Medicine, Nanchang, China
| | - Fei Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.,Laboratory of Metabolomics and Drug-Induced Liver Injury, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, China
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15
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Follicular Fluid Metabolite Changes in Dairy Cows with Inactive Ovary Identified Using Untargeted Metabolomics. BIOMED RESEARCH INTERNATIONAL 2020; 2020:9837543. [PMID: 33282958 PMCID: PMC7685799 DOI: 10.1155/2020/9837543] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 09/29/2020] [Accepted: 10/16/2020] [Indexed: 11/29/2022]
Abstract
The metabolism of dairy cows with inactive ovaries differs from that of healthy dairy cows. However, the molecular mechanisms underpinning these physiological and metabolic changes remain unclear. The purpose of this study was to investigate follicular fluid metabolite changes in dairy cows with inactive ovaries. Untargeted metabolomics technology and multivariate statistical analysis were used to screen differential metabolites in follicular fluid samples between inactive ovaries and estrus cows at 45-60 d postpartum. Fourteen differential metabolites were identified, consisting of amino acids, lipids, sugars, and nucleotides. When compared with healthy animal samples, eight follicular fluid metabolites were significantly increased, and six metabolites were significantly decreased in dairy cows with inactive ovaries. Metabolic pathway analyses indicated that differential metabolites were primarily involved in glycerol phospholipid metabolism, arachidonic acid metabolism, valine, leucine and isoleucine biosynthesis, and phenylalanine metabolism. These metabolites and their enrichment pathways indicate that the enhancement of lipid metabolism and the weakening of carbohydrate production of amino acids in dairy cows with impaired follicular development. Overall, these data provide a better understanding of the changes that could affect follicular development during the postpartum period and lay the ground for further investigations.
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16
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Therapeutic action against chronic cholestatic liver injury by low-dose fenofibrate involves anti-chemotaxis via JNK–AP1–CCL2/CXCL2 signaling. Pharmacol Rep 2020; 72:935-944. [DOI: 10.1007/s43440-019-00043-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Revised: 10/16/2019] [Accepted: 11/19/2019] [Indexed: 12/12/2022]
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17
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Avalos-de León CG, Jiménez-Castro MB, Cornide-Petronio ME, Gulfo J, Rotondo F, Gracia-Sancho J, Casillas-Ramírez A, Peralta C. The Effect of Fibroblast Growth Factor 15 Signaling in Non-Steatotic and Steatotic Liver Transplantation from Cardiocirculatory Death. Cells 2019; 8:E1640. [PMID: 31847428 PMCID: PMC6952771 DOI: 10.3390/cells8121640] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 12/12/2019] [Accepted: 12/13/2019] [Indexed: 12/13/2022] Open
Abstract
We elucidate the relevance of fibroblast growth factor 15 (FGF15) in liver transplantation (LT) using rats with both steatotic and non-steatotic organs from donors after cardiocirculatory death (DCD). Compared to LT from non-DCDs, the induction of cardiocirculatory death (CD) increases hepatic damage, proliferation, and intestinal and circulatory FGF15. This is associated with high levels of FGF15, bilirubin and bile acids (BAs), and overexpression of the enzyme involved in the alternative BA synthesis pathway, CYP27A1, in non-steatotic livers. Furthermore, CD activates the proliferative pathway, Hippo/YAP, in these types of liver. Blocking FGF15 action in LT from DCDs does not affect CYP27A1 but causes an overexpression of CYP7A, an enzyme from the classic BA synthesis pathway, and this is related to further accumulation of BAs and exacerbated damage. FGF15 inhibition also impairs proliferation without changing Hippo/YAP. In spite of worse damage, steatosis prevents a proliferative response in livers from DCDs. In steatotic grafts, CD does not modify CYP7A1, CYP27A1, BA, or the Hippo/YAP pathway, and FGF15 is not involved in damage or proliferation. Thus, endogenous FGF15 protects against BA accumulation and damage and promotes regeneration independently of the Hippo/YAP pathway, in non-steatotic LT from DCDs. Herein we show a minor role of FGF15 in steatotic LT from DCDs.
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Affiliation(s)
- Cindy G. Avalos-de León
- Institut d’Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS), 08036 Barcelona, Spain; (C.G.A.-d.L.); (M.B.J.-C.); (M.E.C.-P.); (J.G.); (F.R.)
| | - Mónica B. Jiménez-Castro
- Institut d’Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS), 08036 Barcelona, Spain; (C.G.A.-d.L.); (M.B.J.-C.); (M.E.C.-P.); (J.G.); (F.R.)
| | - María Eugenia Cornide-Petronio
- Institut d’Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS), 08036 Barcelona, Spain; (C.G.A.-d.L.); (M.B.J.-C.); (M.E.C.-P.); (J.G.); (F.R.)
| | - José Gulfo
- Institut d’Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS), 08036 Barcelona, Spain; (C.G.A.-d.L.); (M.B.J.-C.); (M.E.C.-P.); (J.G.); (F.R.)
| | - Floriana Rotondo
- Institut d’Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS), 08036 Barcelona, Spain; (C.G.A.-d.L.); (M.B.J.-C.); (M.E.C.-P.); (J.G.); (F.R.)
| | - Jordi Gracia-Sancho
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), 08036 Barcelona, Spain;
- Liver Vascular Biology Research Group, IDIBAPS, 08036 Barcelona, Spain
| | - Araní Casillas-Ramírez
- Hospital Regional de Alta Especialidad de Ciudad Victoria “Bicentenario 2010”, Ciudad Victoria 87087, Mexico
- Facultad de Medicina e Ingeniería en Sistemas Computacionales de Matamoros, Universidad Autónoma de Tamaulipas, Matamoros 87300, Mexico
| | - Carmen Peralta
- Institut d’Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS), 08036 Barcelona, Spain; (C.G.A.-d.L.); (M.B.J.-C.); (M.E.C.-P.); (J.G.); (F.R.)
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), 08036 Barcelona, Spain;
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18
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Phelps T, Snyder E, Rodriguez E, Child H, Harvey P. The influence of biological sex and sex hormones on bile acid synthesis and cholesterol homeostasis. Biol Sex Differ 2019; 10:52. [PMID: 31775872 PMCID: PMC6880483 DOI: 10.1186/s13293-019-0265-3] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Accepted: 09/11/2019] [Indexed: 12/13/2022] Open
Abstract
Obesity and elevated serum lipids are associated with a threefold increase in the risk of developing atherosclerosis, a condition that underlies stroke, myocardial infarction, and sudden cardiac death. Strategies that aim to reduce serum cholesterol through modulation of liver enzymes have been successful in decreasing the risk of developing atherosclerosis and reducing mortality. Statins, which inhibit cholesterol biosynthesis in the liver, are considered among the most successful compounds developed for the treatment of cardiovascular disease. However, recent debate surrounding their effectiveness and safety prompts consideration of alternative cholesterol-lowering therapies, including increasing cholesterol catabolism through bile acid (BA) synthesis. Targeting the enzymes that convert cholesterol to BAs represents a promising alternative to other cholesterol-lowering approaches that treat atherosclerosis as well as fatty liver diseases and diabetes mellitus. Compounds that modify the activity of these pathways have been developed; however, there remains a lack of consideration of biological sex. This is necessary in light of strong evidence for sexual dimorphisms not only in the incidence and progression of the diseases they influence but also in the expression and activity of the proteins affected and in the manner in which men and women respond to drugs that modify lipid handling in the liver. A thorough understanding of the enzymes involved in cholesterol catabolism and modulation by biological sex is necessary to maximize their therapeutic potential.
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Affiliation(s)
- Taylor Phelps
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado at Boulder, Boulder, CO, 80309, USA
| | - Erin Snyder
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado at Boulder, Boulder, CO, 80309, USA
| | - Erin Rodriguez
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado at Boulder, Boulder, CO, 80309, USA
| | - Hailey Child
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado at Boulder, Boulder, CO, 80309, USA
| | - Pamela Harvey
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado at Boulder, Boulder, CO, 80309, USA.
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19
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Lei CX, Li MM, Tian JJ, Wen JK, Li YY. Transcriptome analysis of golden pompano (Trachinotus ovatus) liver indicates a potential regulatory target involved in HUFA uptake and deposition. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS 2019; 33:100633. [PMID: 31733535 DOI: 10.1016/j.cbd.2019.100633] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 10/21/2019] [Accepted: 10/21/2019] [Indexed: 12/12/2022]
Abstract
Promoting highly unsaturated fatty acid (HUFA) uptake and deposition can improve nutritional value of farmed fish and reduce dietary fish oil addition. Previously, we found that the golden pompano Trachinotus ovatus liver HUFA content increased with the increasing of dietary HUFA. Therefore, we examined the common genes and pathways responsible for HUFA uptake and deposition in T. ovatus liver using transcriptome sequencing technology after feeding with either 1.0% or 2.1% HUFA for 8 weeks. Results showed that a total of 140 and 147 genes were significantly upregulated and downregulated, respectively. Five bile acid synthesis-related genes (CYP7A1, CYP8B1, AKR1D1, SCP2 and ACOT8), which are related to dietary fat emulsification were downregulated in 2.1% HUFA group, implying that the cholate synthesized through the classical pathway might be the main bile acid form in fat emulsification. Moreover, fatty acid transport protein (FATP)-6, fatty acid binding protein (FABP)-1, -4, and -6 increased with HUFA deposition, especially FATP6 and FABP4, suggesting that the two genes may be important mediators involved in HUFA uptake and deposition. KEGG analysis showed that most of the differential genes described above were involved in peroxisome proliferator activator receptor (PPAR) signaling pathway, and PPARγ increased with HUFA deposition, indicating that PPARγ might be a key regulator of HUFA uptake and deposition by regulating the genes involved in fatty acid emulsification and transport. This study focused on the liver, which is the center of intermediary metabolism, providing a comprehensive understanding of the molecular regulation of HUFA uptake and deposition in T. ovatus, which should be further investigated to develop potential measures to improve HUFA content.
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Affiliation(s)
- Cai-Xia Lei
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Meng-Meng Li
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Jing-Jing Tian
- Key Laboratory of Tropical & Subtropical Fishery Resource Application & Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Ji-Kai Wen
- College of Life Science, South China Agricultural University, Guangzhou 510642, China.
| | - Yuan-You Li
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China.
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20
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Rana R, Shearer AM, Fletcher EK, Nguyen N, Guha S, Cox DH, Abdelmalek M, Wang Y, Baleja JD, Covic L, Kuliopulos A. PAR2 controls cholesterol homeostasis and lipid metabolism in nonalcoholic fatty liver disease. Mol Metab 2019; 29:99-113. [PMID: 31668396 PMCID: PMC6742970 DOI: 10.1016/j.molmet.2019.08.019] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 08/16/2019] [Accepted: 08/24/2019] [Indexed: 01/04/2023] Open
Abstract
OBJECTIVE Increases in hepatic and plasma cholesterol occur in patients with nonalcoholic fatty liver disease (NAFLD), although the reason for this is not well understood. We investigated whether Protease-Activated Receptor 2 (PAR2) plays a role in cholesterol and lipid homeostasis in NAFLD. METHODS Human liver biopsies (n = 108) were quantified for PAR2 expression from NAFLD cases randomly selected and stratified by liver fibrosis stage, the primary predictor for clinical outcomes, while controlling for age, gender, and BMI between fibrosis groups. Demographic data and laboratory studies on plasma samples were obtained within 6 months of liver biopsy. Wild-type and PAR2-KO (C57BL/6 F2rl1-/-) mice were fed either normal or high fat diet for 16 weeks and plasma and liver assayed for lipids and soluble metabolites. RESULTS Severity of NAFLD and plasma cholesterol levels significantly correlated with hepatocyte PAR2 expression in NAFLD patients. Conversely, PAR2 deficiency in mice resulted in reduced expression of key hepatic genes involved in cholesterol synthesis, a 50% drop in plasma and total liver cholesterol, and induced a reverse cholesterol transport system that culminated in 25% higher fecal bile acid output. PAR2-deficient mice exhibited enhanced fatty acid β-oxidation with a ketogenic shift and an unexpected increase in liver glycogenesis. Mechanistic studies identified Gi-Jnk1/2 as key downstream effectors of protease-activated PAR2 in the regulation of lipid and cholesterol homeostasis in liver. CONCLUSIONS These data indicate that PAR2 may be a new target for the suppression of plasma cholesterol and hepatic fat accumulation in NAFLD and related metabolic conditions.
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Affiliation(s)
- Rajashree Rana
- Center for Hemostasis and Thrombosis Research, Tufts Medical Center, 800 Washington St, Boston, MA, 02111, USA
| | - Andrew M Shearer
- Center for Hemostasis and Thrombosis Research, Tufts Medical Center, 800 Washington St, Boston, MA, 02111, USA; Tufts University School of Graduate Biomedical Sciences, Tufts University School of Medicine, Boston, MA, 02111, USA
| | - Elizabeth K Fletcher
- Center for Hemostasis and Thrombosis Research, Tufts Medical Center, 800 Washington St, Boston, MA, 02111, USA
| | - Nga Nguyen
- Center for Hemostasis and Thrombosis Research, Tufts Medical Center, 800 Washington St, Boston, MA, 02111, USA
| | - Srijoy Guha
- Center for Hemostasis and Thrombosis Research, Tufts Medical Center, 800 Washington St, Boston, MA, 02111, USA
| | - Daniel H Cox
- Tufts University School of Graduate Biomedical Sciences, Tufts University School of Medicine, Boston, MA, 02111, USA
| | - Manal Abdelmalek
- Division of Gastroenterology and Hepatology, Duke University Medical Center, Durham, NC, 27710, USA
| | - Ying Wang
- Division of Gastroenterology and Hepatology, Duke University Medical Center, Durham, NC, 27710, USA
| | - James D Baleja
- Tufts University School of Graduate Biomedical Sciences, Tufts University School of Medicine, Boston, MA, 02111, USA
| | - Lidija Covic
- Center for Hemostasis and Thrombosis Research, Tufts Medical Center, 800 Washington St, Boston, MA, 02111, USA; Tufts University School of Graduate Biomedical Sciences, Tufts University School of Medicine, Boston, MA, 02111, USA
| | - Athan Kuliopulos
- Center for Hemostasis and Thrombosis Research, Tufts Medical Center, 800 Washington St, Boston, MA, 02111, USA; Tufts University School of Graduate Biomedical Sciences, Tufts University School of Medicine, Boston, MA, 02111, USA.
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21
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Chen YY, Shen J, Tang YP, Yu JG, Wang J, Yue SJ, Yang J, Chen JQ, Feng LM, Zhu ZH, Tao WW, Zhang L, Duan JA. Elucidating the interaction of kansui and licorice by comparative plasma/tissue metabolomics and a heatmap with relative fold change. J Pharm Anal 2019; 9:312-323. [PMID: 31929940 PMCID: PMC6951493 DOI: 10.1016/j.jpha.2019.05.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 04/13/2019] [Accepted: 05/29/2019] [Indexed: 11/25/2022] Open
Abstract
Although compatibility is highly advocated in traditional Chinese medicine (TCM), inappropriate combination of some herbs may reduce the therapeutic action and even produce toxic effects. Kansui and licorice, one of TCM "Eighteen Incompatible Medicaments", are the most representative cases of improper herbal combination, which may still be applied simultaneously under given conditions. However, the potential mechanism of their compatibility and incompatibility is unclear. In the present study, two different ratios of kansui and licorice, representing their compatibility and incompatibility respectively, were designed to elucidate their interaction by comparative plasma/tissue metabolomics and a heatmap with relative fold change. As a result, glycocholic acid, prostaglandin F2a, dihydroceramide and sphinganine were screened out as the principal alternative biomarkers of compatibility group; sphinganine, dihydroceramide, arachidonic acid, leukotriene B4, acetoacetic acid and linoleic acid were those of incompatibility group. Based on the values of biomarkers in each tissue, the liver was identified as the compatible target organ, while the heart, liver, and kidney were the incompatible target organs. Furthermore, important pathways for compatibility and incompatibility were also constructed. These results help us to better understand and utilize the two herbs, and the study was the first to reveal some innate characters of herbs related to TCM "Eighteen Incompatible Medicaments".
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Affiliation(s)
- Yan-Yan Chen
- Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility, State Key Laboratory of Research & Development of Characteristic Qin Medicine Resources (Cultivation), Shaanxi Key Laboratory of Chinese Medicine Fundamentals and New Drugs Research, and Shaanxi Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Shaanxi University of Chinese Medicine, Xi’an 712046, Shaanxi Province, China
| | - Juan Shen
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, National and Local Collaborative Engineering Center of Chinese Medicinal Resources Industrialization and Formulae Innovative Medicine, and Jiangsu Key Laboratory for High Technology Research of TCM Formulae, Nanjing University of Chinese Medicine, Nanjing 210023, Jiangsu Province, China
| | - Yu-Ping Tang
- Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility, State Key Laboratory of Research & Development of Characteristic Qin Medicine Resources (Cultivation), Shaanxi Key Laboratory of Chinese Medicine Fundamentals and New Drugs Research, and Shaanxi Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Shaanxi University of Chinese Medicine, Xi’an 712046, Shaanxi Province, China
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, National and Local Collaborative Engineering Center of Chinese Medicinal Resources Industrialization and Formulae Innovative Medicine, and Jiangsu Key Laboratory for High Technology Research of TCM Formulae, Nanjing University of Chinese Medicine, Nanjing 210023, Jiangsu Province, China
| | - Jin-Gao Yu
- Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility, State Key Laboratory of Research & Development of Characteristic Qin Medicine Resources (Cultivation), Shaanxi Key Laboratory of Chinese Medicine Fundamentals and New Drugs Research, and Shaanxi Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Shaanxi University of Chinese Medicine, Xi’an 712046, Shaanxi Province, China
| | - Jing Wang
- Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility, State Key Laboratory of Research & Development of Characteristic Qin Medicine Resources (Cultivation), Shaanxi Key Laboratory of Chinese Medicine Fundamentals and New Drugs Research, and Shaanxi Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Shaanxi University of Chinese Medicine, Xi’an 712046, Shaanxi Province, China
| | - Shi-Jun Yue
- Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility, State Key Laboratory of Research & Development of Characteristic Qin Medicine Resources (Cultivation), Shaanxi Key Laboratory of Chinese Medicine Fundamentals and New Drugs Research, and Shaanxi Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Shaanxi University of Chinese Medicine, Xi’an 712046, Shaanxi Province, China
| | - Jie Yang
- Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility, State Key Laboratory of Research & Development of Characteristic Qin Medicine Resources (Cultivation), Shaanxi Key Laboratory of Chinese Medicine Fundamentals and New Drugs Research, and Shaanxi Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Shaanxi University of Chinese Medicine, Xi’an 712046, Shaanxi Province, China
| | - Jia-Qian Chen
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, National and Local Collaborative Engineering Center of Chinese Medicinal Resources Industrialization and Formulae Innovative Medicine, and Jiangsu Key Laboratory for High Technology Research of TCM Formulae, Nanjing University of Chinese Medicine, Nanjing 210023, Jiangsu Province, China
| | - Li-Mei Feng
- Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility, State Key Laboratory of Research & Development of Characteristic Qin Medicine Resources (Cultivation), Shaanxi Key Laboratory of Chinese Medicine Fundamentals and New Drugs Research, and Shaanxi Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Shaanxi University of Chinese Medicine, Xi’an 712046, Shaanxi Province, China
| | - Zhen-Hua Zhu
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, National and Local Collaborative Engineering Center of Chinese Medicinal Resources Industrialization and Formulae Innovative Medicine, and Jiangsu Key Laboratory for High Technology Research of TCM Formulae, Nanjing University of Chinese Medicine, Nanjing 210023, Jiangsu Province, China
| | - Wei-Wei Tao
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, National and Local Collaborative Engineering Center of Chinese Medicinal Resources Industrialization and Formulae Innovative Medicine, and Jiangsu Key Laboratory for High Technology Research of TCM Formulae, Nanjing University of Chinese Medicine, Nanjing 210023, Jiangsu Province, China
| | - Li Zhang
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, National and Local Collaborative Engineering Center of Chinese Medicinal Resources Industrialization and Formulae Innovative Medicine, and Jiangsu Key Laboratory for High Technology Research of TCM Formulae, Nanjing University of Chinese Medicine, Nanjing 210023, Jiangsu Province, China
| | - Jin-Ao Duan
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, National and Local Collaborative Engineering Center of Chinese Medicinal Resources Industrialization and Formulae Innovative Medicine, and Jiangsu Key Laboratory for High Technology Research of TCM Formulae, Nanjing University of Chinese Medicine, Nanjing 210023, Jiangsu Province, China
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22
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Hung C, Napoli E, Ross-Inta C, Graham J, Flores-Torres AL, Stanhope KL, Froment P, Havel PJ, Giulivi C. Ileal interposition surgery targets the hepatic TGF-β pathway, influencing gluconeogenesis and mitochondrial bioenergetics in the UCD-T2DM rat model of diabetes. FASEB J 2019; 33:11270-11283. [PMID: 31307210 DOI: 10.1096/fj.201802714r] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Ileal interposition (IT) is a surgical procedure that increases the delivery of incompletely digested nutrients and biliary and pancreatic secretions to the distal intestinal mucosa. Here, we investigated the metabolic impact of this intervention in 2-mo-old prediabetic University of California, Davis type 2 diabetes mellitus rats by assessing liver gene expression at 1.5 mo post-IT surgery. Pathway analysis indicated decreased signaling via TGF-β/Smad (a family of proteins named mothers against decapentaplegic homologs), peroxisome proliferator-activated receptor (PPAR), and PI3K-Akt-AMPK-mechanistic target of rapamycin, likely targeting hepatic stellate cells because differentiation and activation of these cells is associated with decreased signaling via PPAR and TGF-β/Smad. IT surgery up-regulated the expression of genes involved in regulation of cholesterol and terpenoid syntheses and down-regulated those involved in glycerophospholipid metabolism [including cardiolipin (CL)], lipogenesis, and gluconeogenesis. Consistent with the down-regulation of the hepatic CL pathway, IT surgery produced a metabolic switch in liver, kidney cortex, and fat depots toward decreased mitochondrial fatty acid β-oxidation, the process required to fuel high energy-demanding pathways (e.g., gluconeogenesis and glyceroneogenesis), whereas opposite effects were observed in skeletal and cardiac muscles. This study demonstrates for the first time the presence of metabolic pathways that complement the effects of IT surgery to maximize its benefits and potentially identify similarly effective, durable, and less invasive therapeutic options for metabolic disease, including inhibitors of TGF-β signaling.-Hung, C., Napoli, E., Ross-Inta, C., Graham, J., Flores-Torres, A. L., Stanhope, K. L., Froment, P., Havel, P. J., Giulivi, C. Ileal interposition surgery targets the hepatic TGF-β pathway, influencing gluconeogenesis and mitochondrial bioenergetics in the UCD-T2DM rat model of diabetes.
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Affiliation(s)
- Connie Hung
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Eleonora Napoli
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - Catherine Ross-Inta
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, Davis, California, USA
| | - James Graham
- Department of Nutrition, University of California, Davis, Davis, California, USA
| | - Amanda L Flores-Torres
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, Davis, California, USA.,Department of Biochemistry, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico
| | - Kimber L Stanhope
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, Davis, California, USA.,Department of Nutrition, University of California, Davis, Davis, California, USA
| | - Pascal Froment
- Unité de Physiologie de la Reproduction et des Comportements, Institut National de la Recherche Agronomique, Unité Mixte de Recherche (UMR) 85, Paris, France
| | - Peter J Havel
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, Davis, California, USA.,Department of Nutrition, University of California, Davis, Davis, California, USA
| | - Cecilia Giulivi
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, Davis, California, USA.,Medical Investigations of Neurodevelopmental Disorders (MIND) Institute, University of California, Davis, Davis, California, USA
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23
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Liu R, Cheng M, Kothapalli KSD, Wang Z, Mendralla E, Park HG, Block RC, Wang X, Brenna JT. Glycerol derived process contaminants in refined coconut oil induce cholesterol synthesis in HepG2 cells. Food Chem Toxicol 2019; 127:135-142. [PMID: 30878531 PMCID: PMC6467815 DOI: 10.1016/j.fct.2019.03.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 03/05/2019] [Accepted: 03/07/2019] [Indexed: 10/27/2022]
Abstract
Despite its 50-year history, the conventional diet-heart hypothesis holding that dietary saturated fats raise serum cholesterol, and with it, cardiovascular risk, remains controversial. Harsh chemical and physical treatment generates process contaminants, and refined oils raise serum and tissue cholesterol in vivo independent of saturated fat content. We developed an in vitro bioassay for rapidly assessing the influence of oils on cholesterol metabolism in the human liver HepG2 cell line, and tested it using coconut oil (CO) of various stages of refinement. CO was dissolved with dipalmitoyl phosphatidylcholine (DPPC) surfactant, solvent evaporated, and emulsified into fat-free cell culture media. After 24 h treatment cellular cholesterol and triacylglycerol increased; HMG-CoA Reductase (HMGCR) increased and CYP7A1 (cholesterol 7α-hydroxylase) decreased with sequential processing steps, deacidification, bleaching, deodorization, while fatty acid profiles were not affected. Glycerol-derived process contaminants glycidyl esters and monochloropropandiol (MCPD) increased with processing. Addition of glycidyl or MCPD to virgin CO (VCO) had similar effects to processing, while addition of phenolic antioxidants to fully refined CO reduced HMGCR and increased CYP7A1. We conclude that harsh processing creates contaminants that raise cholesterol levels in vitro, consistent with a role as a contributing atherosclerotic factor.
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Affiliation(s)
- Ruijie Liu
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA; Synergetic Innovation Center of Food Safety and Nutrition of Jiangsu Province, School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu Province, PR China; Dell Pediatric Research Institute and the Depts. of Chemistry, of Pediatrics, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, TX, 78723, USA
| | - Min Cheng
- Synergetic Innovation Center of Food Safety and Nutrition of Jiangsu Province, School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu Province, PR China
| | - Kumar S D Kothapalli
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA; Dell Pediatric Research Institute and the Depts. of Chemistry, of Pediatrics, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, TX, 78723, USA
| | - Zhen Wang
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA; Dell Pediatric Research Institute and the Depts. of Chemistry, of Pediatrics, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, TX, 78723, USA
| | - Elizabeth Mendralla
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA
| | - Hui Gyu Park
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA; Dell Pediatric Research Institute and the Depts. of Chemistry, of Pediatrics, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, TX, 78723, USA
| | - Robert C Block
- Department of Community and Preventive Medicine and Cardiology Division, Department of Medicine, The University of Rochester School of Medicine and Dentistry, Saunders Research Building, Rochester, NY, 14642, USA
| | - Xingguo Wang
- Synergetic Innovation Center of Food Safety and Nutrition of Jiangsu Province, School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu Province, PR China
| | - J Thomas Brenna
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, 14853, USA; Dell Pediatric Research Institute and the Depts. of Chemistry, of Pediatrics, and of Nutrition, University of Texas at Austin, 1400 Barbara Jordan Blvd, Austin, TX, 78723, USA.
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24
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Won KJ, Park JS, Jeong H. Repression of hepatocyte nuclear factor 4 alpha by AP-1 underlies dyslipidemia associated with retinoic acid. J Lipid Res 2019; 60:794-804. [PMID: 30709899 PMCID: PMC6446710 DOI: 10.1194/jlr.m088880] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 01/28/2019] [Indexed: 11/20/2022] Open
Abstract
All-trans retinoic acid (atRA) is used to treat certain cancers and dermatologic diseases. A common adverse effect of atRA is hypercholesterolemia; cytochrome P450 (CYP) 7A repression is suggested as a driver. However, the underlying molecular mechanisms remain unclear. We investigated CYP7A1 expression in the presence of atRA in human hepatocytes and hepatic cell lines. In HepaRG cells, atRA increased cholesterol levels dose-dependently alongside dramatic decreases in CYP7A1 expression. Lentiviral-mediated CYP7A1 overexpression reversed atRA-induced cholesterol accumulation, suggesting that CYP7A1 repression mediated cholesterol accumulation. In CYP7A1 promoter reporter assays and gene-knockdown studies, altered binding of hepatocyte nuclear factor 4 α (HNF4α) to the proximal promoter was essential for atRA-mediated CYP7A1 repression. Pharmacologic inhibition of c-Jun N-terminal kinase (JNK) and ERK pathways attenuated atRA-mediated CYP7A1 repression and cholesterol accumulation. Overexpression of AP-1 (c-Jun/c-Fos), a downstream target of JNK and ERK, repressed CYP7A1 expression. In DNA pull-down and chromatin immunoprecipitation assays, AP-1 exhibited sequence-specific binding to the proximal CYP7A1 promoter region overlapping the HNF4α binding site, and atRA increased AP-1 but decreased HNF4α recruitment to the promoter. Collectively, these results indicate that atRA activates JNK and ERK pathways and the downstream target AP-1 represses HNF4α transactivation of the CYP7A1 promoter, potentially responsible for hypercholesterolemia.
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Affiliation(s)
- Kyoung-Jae Won
- Departments of Pharmacy Practice College of Pharmacy, University of Illinois at Chicago, Chicago, IL
| | - Joo-Seop Park
- Divisions of Pediatric Urology Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH; Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH
| | - Hyunyoung Jeong
- Departments of Pharmacy Practice College of Pharmacy, University of Illinois at Chicago, Chicago, IL; Biopharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, IL.
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25
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Horváth G, Egyed O, Tang C, Kovács M, Micsonai A, Kardos J, Toke O. Ligand entry in human ileal bile acid-binding protein is mediated by histidine protonation. Sci Rep 2019; 9:4825. [PMID: 30886237 PMCID: PMC6423008 DOI: 10.1038/s41598-019-41180-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Accepted: 02/28/2019] [Indexed: 01/07/2023] Open
Abstract
Human ileal bile acid-binding protein (hI-BABP) has a key role in the intracellular transport of bile salts. To explore the role of histidine protonation in the binding process, the pH-dependence of bile salt binding and internal dynamics in hI-BABP was investigated using NMR spectroscopy and biophysical tools. Thermodynamic and kinetic measurements show an increase in the overall binding affinity and the association rate constant of the first binding step below the pKa of the histidines, suggesting that ligand binding is favoured by the protonated state. The overlap between residues exhibiting a high sensitivity to pH in their backbone amide chemical shifts and protein regions undergoing a global ms conformational exchange indicate a connection between the two processes. According to 15N NMR relaxation dispersion analysis, the slow motion is most pronounced at and above the pKa of the histidines. In agreement with the NMR measurements, MD simulations show a stabilization of the protein by histidine protonation. Hydrogen-bonding and van der Waals interactions mediating the flow of information between the C/D- and G/H-turn regions hosting the three histidines, suggest a complex way of pH-governed allosteric regulation of ligand entry involving a transition between a closed and a more open protein state.
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Affiliation(s)
- Gergő Horváth
- Laboratory for NMR Spectroscopy, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 2 Magyar tudósok körútja, H-1117, Budapest, Hungary
| | - Orsolya Egyed
- Laboratory for NMR Spectroscopy, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 2 Magyar tudósok körútja, H-1117, Budapest, Hungary
| | - Changguo Tang
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, Missouri, 63110, USA
| | - Mihály Kovács
- Department of Biochemistry, ELTE-MTA "Momentum" Motor Enzymology Research Group, Eötvös Loránd University, Pázmány Péter sétány 1/C, H-1117, Budapest, Hungary
| | - András Micsonai
- Department of Biochemistry, MTA-ELTE NAP B Neuroimmunology Research Group, Institute of Biology, Eötvös Loránd University, Pázmány Péter sétány 1/C, H-1117, Budapest, Hungary
| | - József Kardos
- Department of Biochemistry, MTA-ELTE NAP B Neuroimmunology Research Group, Institute of Biology, Eötvös Loránd University, Pázmány Péter sétány 1/C, H-1117, Budapest, Hungary
| | - Orsolya Toke
- Laboratory for NMR Spectroscopy, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 2 Magyar tudósok körútja, H-1117, Budapest, Hungary.
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26
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Hu X, Wang Y, Sheikhahmadi A, Li X, Buyse J, Lin H, Song Z. Effects of glucocorticoids on lipid metabolism and AMPK in broiler chickens' liver. Comp Biochem Physiol B Biochem Mol Biol 2019; 232:23-30. [PMID: 30790719 DOI: 10.1016/j.cbpb.2019.02.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 02/06/2019] [Indexed: 12/21/2022]
Abstract
Adenosine monophosphate-activated protein kinase (AMPK) plays a pivotal role in the regulation of carbohydrate, lipid, and protein metabolism in animals. In this study, we examined whether any cross talk exists between glucocorticoids and AMPK in the regulation of the liver bile acid biosynthesis pathway. Dexamethasone treatment decreased the growth performance of broiler chickens. The liver mRNA levels of fatty acid transport protein (FATP-1), farnesoid X receptor (FXR), AMPK alpha 1 subunit (AMPKα1), and glucocorticoid receptor were significantly upregulated in DEX-treated broilers; the gene expression of liver cholesterol 7 alpha-hydroxylase (CYP7A1) was significantly downregulated. The protein level of liver CYP7A1 was significantly decreased by DEX treatment at both 24 and 72 h, while the protein level of p-AMPK/ t-AMPK stayed unchanged. In the in vitro cultured hepatocytes, compound C pretreatment blocked the increase in CYP7A1 protein level by DEX and significantly suppressed FATP-1, SREBP-1c, FXR, and CYP7A1 gene expression stimulated by DEX. Compound C treatment significantly reduces the protein level of p-AMPK, and the combination of compound C and DEX significantly reduces the protein level of t-AMPK. Thus, glucocorticoids affected liver AMPK and the bile acid synthesis signal pathway, and AMPK might be involved in the glucocorticoid effect of liver bile acid synthesis.
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Affiliation(s)
- Xiyi Hu
- Department of Animal Science, Shandong Agricultural University, Taian, Shandong 271018, China
| | - Yufeng Wang
- Division Animal and Human Health Engineering, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium
| | - Ardashir Sheikhahmadi
- Department of Animal Science, Faculty of Agriculture, University of Kurdistan, Sanandaj 66177-15175, Iran
| | - Xianlei Li
- Department of Animal Science, Shandong Agricultural University, Taian, Shandong 271018, China
| | - Johan Buyse
- Division Animal and Human Health Engineering, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium
| | - Hai Lin
- Department of Animal Science, Shandong Agricultural University, Taian, Shandong 271018, China
| | - Zhigang Song
- Department of Animal Science, Shandong Agricultural University, Taian, Shandong 271018, China.
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27
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van de Wiel SMW, Bijsmans ITGW, van Mil SWC, van de Graaf SFJ. Identification of FDA-approved drugs targeting the Farnesoid X Receptor. Sci Rep 2019; 9:2193. [PMID: 30778102 PMCID: PMC6379390 DOI: 10.1038/s41598-019-38668-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 12/21/2018] [Indexed: 12/25/2022] Open
Abstract
The farnesoid X receptor (FXR) belongs to the nuclear receptor family and is activated by bile acids. Multiple, chemically rather diverse, FXR agonists have been developed and several of these compounds are currently tested in clinical trials for NAFLD and cholestasis. Here, we investigated possible FXR-agonism or antagonism of existing FDA/EMA-approved drugs. By using our recently developed FRET-sensor, containing the ligand binding domain of FXR (FXR-LBD), 1280 FDA-approved drugs were screened for their ability to activate FXR in living cells using flow cytometry. Fifteen compounds induced the sensor for more than twenty percent above background. Real-time confocal microscopy confirmed that avermectin B1a, gliquidone, nicardipine, bepridil and triclosan activated the FRET sensor within two minutes. These compounds, including fluticasone, increased mRNA expression of FXR target genes OSTα and OSTβ in Huh7 cells, and in most cases also of MRP2, SHP and FGF19. Finally, avermectin B1a, gliquidone, nicardipine and bepridil significantly increased IBABP promoter activity in a luciferase reporter assay in a dose-dependent manner. In conclusion, six FDA/EMA-approved drugs currently used in the clinical practice exhibit moderate agonistic FXR activity. This may on the one hand explain (undesired) side-effects, but on the other hand may form an opportunity for polypharmacology.
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Affiliation(s)
- Sandra M W van de Wiel
- Tytgat Institute for Liver and Intestinal Research, Amsterdam Gastroenterology and Metabolism, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Department of Gastroenterology and Hepatology, Amsterdam Gastroenterology and Metabolism, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Ingrid T G W Bijsmans
- Center for Molecular Medicine, UMC Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Saskia W C van Mil
- Tytgat Institute for Liver and Intestinal Research, Amsterdam Gastroenterology and Metabolism, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Center for Molecular Medicine, UMC Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Stan F J van de Graaf
- Tytgat Institute for Liver and Intestinal Research, Amsterdam Gastroenterology and Metabolism, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.
- Department of Gastroenterology and Hepatology, Amsterdam Gastroenterology and Metabolism, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.
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28
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Hutin D, Tamblyn L, Gomez A, Grimaldi G, Soedling H, Cho T, Ahmed S, Lucas C, Kanduri C, Grant DM, Matthews J. Hepatocyte-Specific Deletion of TIPARP, a Negative Regulator of the Aryl Hydrocarbon Receptor, Is Sufficient to Increase Sensitivity to Dioxin-Induced Wasting Syndrome. Toxicol Sci 2018; 165:347-360. [PMID: 29873790 PMCID: PMC6154274 DOI: 10.1093/toxsci/kfy136] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
The aryl hydrocarbon receptor (AHR) mediates the toxic effects of dioxin (2, 3, 7, 8-tetrachlorodibenzo-p-dioxin; TCDD), which includes thymic atrophy, steatohepatitis, and a lethal wasting syndrome in laboratory rodents. Although the mechanisms of dioxin toxicity remain unknown, AHR signaling in hepatocytes is necessary for dioxin-induced liver toxicity. We previously reported that loss of TCDD-inducible poly(adenosine diphosphate [ADP]-ribose) polymerase (TIPARP/PARP7/ARTD14), an AHR target gene and mono-ADP-ribosyltransferase, increases the sensitivity of mice to dioxin-induced toxicities. To test the hypothesis that TIPARP is a negative regulator of AHR signaling in hepatocytes, we generated Tiparpfl/fl mice in which exon 3 of Tiparp is flanked by loxP sites, followed by Cre-lox technology to create hepatocyte-specific (Tiparpfl/flCreAlb) and whole-body (Tiparpfl/flCreCMV; TiparpEx3-/-) Tiparp null mice. Tiparpfl/flCreAlb and TiparpEx3-/- mice given a single injection of 10 μg/kg dioxin did not survive beyond days 7 and 9, respectively, while all Tiparp+/+ mice survived the 30-day treatment. Dioxin-exposed Tiparpfl/flCreAlb and TiparpEx3-/- mice had increased steatohepatitis and hepatotoxicity as indicated by greater staining of neutral lipids and serum alanine aminotransferase activity than similarly treated wild-type mice. Tiparpfl/flCreAlb and TiparpEx3-/- mice exhibited augmented AHR signaling, denoted by increased dioxin-induced gene expression. Metabolomic studies revealed alterations in lipid and amino acid metabolism in liver extracts from Tiparpfl/flCreAlb mice compared with wild-type mice. Taken together, these data illustrate that TIPARP is an important negative regulator of AHR activity, and that its specific loss in hepatocytes is sufficient to increase sensitivity to dioxin-induced steatohepatitis and lethality.
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Affiliation(s)
- David Hutin
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Canada
| | - Laura Tamblyn
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Canada
| | - Alvin Gomez
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Canada
| | - Giulia Grimaldi
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Canada
| | - Helen Soedling
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Canada
| | - Tiffany Cho
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Canada
| | - Shaimaa Ahmed
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Canada
| | - Christin Lucas
- Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - Chakravarthi Kanduri
- Department of Informatics, Jebsen Centre of Excellence for Celiac Disease Research, University of Oslo, Oslo, Norway
| | - Denis M Grant
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Canada
| | - Jason Matthews
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Canada
- Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
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29
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Guo CF, Yuan YH, Yue TL, Li JY. Hamsters Are a Better Model System than Rats for Evaluating the Hypocholesterolemic Efficacy of Potential Probiotic Strains. Mol Nutr Food Res 2018; 62:e1800170. [PMID: 29939474 DOI: 10.1002/mnfr.201800170] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Revised: 06/01/2018] [Indexed: 01/17/2023]
Abstract
SCOPE Rats and hamsters are the most commonly used animal models for evaluating the hypocholesterolemic activity of potential probiotic strains, whereas little or no information has been reported on whether the animal models would affect the experimental conclusions regarding the hypocholesterolemic efficacy of the strains. METHODS AND RESULTS Both high-cholesterol-fed rats and hamsters were intragastrically administered viable cells of bile salt hydrolase-active Lactobacillus acidophilus K16 once daily (1 × 1010 CFU per kg body weight) for 28 d. It was found that the strain did not significantly (p > 0.05) affect the serum and hepatic cholesterol levels in rats, whereas it significantly decreased (p < 0.01 or p < 0.001) the serum total and non-HDL-cholesterol as well as hepatic-free, esterified, and total cholesterol levels in hamsters by 29.6%, 38.8%, 15.8%, 36.2%, and 34.0%, respectively. CONCLUSION These data suggest that the hypocholesterolemic efficacy of L. acidophilus K16 is substantially different between high-cholesterol-fed hamsters and rats and that hamsters are a better model system than rats for evaluating the hypocholesterolemic efficacy of potential probiotic strains due to their similarity to humans in biliary bile acid composition, including types of bile acids and their conjugation form.
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Affiliation(s)
- Chun-Feng Guo
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Ya-Hong Yuan
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Tian-Li Yue
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Jing-Yan Li
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
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Huang F, Zhang F, Xu D, Zhang Z, Xu F, Tao X, Qiu L, Wei H. Enterococcus faecium WEFA23 from infants lessens high-fat-diet-induced hyperlipidemia via cholesterol 7-alpha-hydroxylase gene by altering the composition of gut microbiota in rats. J Dairy Sci 2018; 101:7757-7767. [PMID: 29935822 DOI: 10.3168/jds.2017-13713] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2017] [Accepted: 05/06/2018] [Indexed: 12/31/2022]
Abstract
Enterococcus faecium WEFA23 is a potential probiotic strain from Chinese infants with the ability to decrease cholesterol levels. Aiming to explore the mechanism of E. faecium WEFA23 in lowering cholesterol in vivo, we examined the gene transcriptions related to cholesterol metabolism, the composition of bile acids in feces, the synthesis of trimethylamine N-oxide (TMAO) in liver, and the composition of the gut microbiota of rats. We found that E. faecium WEFA23 enhanced the synthesis of bile acids by promoting cholesterol excretion, upregulating the genes transcript level relevant to cholesterol decomposition and transportation, and downregulating the genes involved in cholesterol synthesis. In addition, E. faecium WEFA23 not only downregulated the transcript levels of farnesoid X receptor and fibroblast growth factor 15 as well as flavin-containing monooxygenase 3, but also decreased the TMAO production followed by increasing the CYP7A1 transcript level. Furthermore, when orally administered to rats for 35 d, E. faecium WEFA23 improved the gut microbiota diversity of rats fed a high-fat diet. Therein, the ratio of Bacteroidetes to Firmicutes and the abundance of Rikenellaceae increased, whereas the number of Veillonellaceae decreased. These results suggest that reduction of cholesterol level by E. faecium WEFA23 might be related to the changes in the gut microbiota. Our finding provides important information on lowering cholesterol by E. faecium and reveals that Enterococcus spp. might have the potential to decrease the TMAO level.
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Affiliation(s)
- Fuqing Huang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, 330047, P. R. China
| | - Fen Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, 330047, P. R. China
| | - Di Xu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, 330047, P. R. China
| | - Zhihong Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, 330047, P. R. China
| | - Feng Xu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, 330047, P. R. China
| | - Xueying Tao
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, 330047, P. R. China
| | - Liang Qiu
- Jiangxi University of Traditional Chinese Medicine, Nanchang, Jiangxi, 330004, P. R. China.
| | - Hua Wei
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, 330047, P. R. China.
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Olivares-Bañuelos TN, Martínez-Hernández I, Hernández-Kelly LC, Chi-Castañeda D, Vega L, Ortega A. The neurotoxin diethyl dithiophosphate impairs glutamate transport in cultured Bergmann glia cells. Neurochem Int 2018; 123:77-84. [PMID: 29908254 DOI: 10.1016/j.neuint.2018.06.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 05/29/2018] [Accepted: 06/10/2018] [Indexed: 12/24/2022]
Abstract
Glutamate, the main excitatory neurotransmitter in the vertebrate Central Nervous System, is involved in almost every aspect of brain physiology, and its signaling properties are severely affected in most neurodegenerative diseases. This neurotransmitter has to be efficiently removed from the synaptic cleft in order to prevent an over-stimulation of glutamate receptors that leads to neuronal death. Specific sodium-dependent membrane transporters, highly enriched in glial cells, elicit the clearance of glutamate. Once internalized, it is metabolized to glutamine by the glia-enriched enzyme Glutamine synthetase. Accumulated glutamine is released into the extracellular space for its uptake into pre-synaptic neurons and its conversion to glutamate that is packed into synaptic vesicles completing the glutamate/glutamine cycle. Diverse chemical compounds, like organophosphates, directly affect brain chemistry by altering levels of neurotransmitters in the synaptic cleft. Organophosphate compounds are widely used as pesticides, and all living organisms are continuously exposed to these substances, either in a direct or indirect manner. Its metabolites, like the diethyl dithiophosphate, are capable of causing brain damage through diverse mechanisms including perturbation of neuronal-glial cell interactions and have been associated with attention-deficit disorders and other mental illness. In order to characterize the neurotoxic mechanisms of diethyl dithiophosphate, we took advantage of the well characterized model of chick cerebellar Bergmann glia cultures. A significant impairment of [3H] d-Aspartate transport was found upon exposure to the metabolite. These results indicate that glia cells are targets of neurotoxic substances such as pesticides and that these cells might be critically involved in the associated neuronal death.
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Affiliation(s)
- Tatiana N Olivares-Bañuelos
- Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Ensenada, 22860, Mexico
| | - Isabel Martínez-Hernández
- Departamento de Toxicología, Centro de Investigación y de Estudios Avanzados Del Instituto Politécnico Nacional, Ciudad de México, 07000, Mexico
| | - Luisa C Hernández-Kelly
- Departamento de Toxicología, Centro de Investigación y de Estudios Avanzados Del Instituto Politécnico Nacional, Ciudad de México, 07000, Mexico
| | - Donají Chi-Castañeda
- Departamento de Toxicología, Centro de Investigación y de Estudios Avanzados Del Instituto Politécnico Nacional, Ciudad de México, 07000, Mexico; Soluciones para un México Verde S.A. de C.V, Ciudad de México, 01210, Mexico
| | - Libia Vega
- Departamento de Toxicología, Centro de Investigación y de Estudios Avanzados Del Instituto Politécnico Nacional, Ciudad de México, 07000, Mexico
| | - Arturo Ortega
- Departamento de Toxicología, Centro de Investigación y de Estudios Avanzados Del Instituto Politécnico Nacional, Ciudad de México, 07000, Mexico.
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Nagaoka S. Structure-function properties of hypolipidemic peptides. J Food Biochem 2018; 43:e12539. [PMID: 31353491 DOI: 10.1111/jfbc.12539] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 01/12/2018] [Accepted: 02/19/2018] [Indexed: 01/06/2023]
Abstract
This review addresses the structure-function properties of hypolipidemic peptides. The cholesterol-lowering peptide (lactostatin: IIAEK) operates via a new regulatory pathway in the calcium-channel-related mitogen-activated protein kinase (MAPK) signaling pathway of cholesterol degradation. The bile acid binding peptide (soystatin, VAWWMY) inhibits the micellar solubility of cholesterol in vitro and cholesterol absorption in vivo. VVYP is the most effective peptide having hypotriglyceridemic action in globin digests. The suppressive effect of globin digest on postprandial hyperlipidemia has been reported in humans. The ability of peptides (KRES, Apolipoprotein A-I mimetic peptides) to interact with lipids, remove LOOH and activate antioxidant enzymes associated with high-density lipoprotein determines their anti-inflammatory and anti-atherogenic properties. The β-conglycinin derived peptides KNPQLR, EITPEKNPQLR, and RKQEEDEDEEQQRE inhibit fatty acid synthase in vitro. These promising findings indicate the need for more conclusive molecular, cellular, and animal and human studies to design innovative new peptides that ameliorate cholesterol and lipid metabolism. PRACTICAL APPLICATIONS: Prevention and amelioration of hypercholesterolemia by dietary regulation are important. Dietary protein and peptides are very useful as regulators of serum cholesterol concentration. Diets low in saturated fat and cholesterol that include soy protein may reduce the risk of heart disease. In Japan, the concept of "food for specified health use" has been introduced for the prevention and treatment of life-style related disease. Thus, peptides derived from food proteins and sources other than food proteins such as peptide-rich functional foods and nutraceutical products, have considerable potential to prevent lifestyle-related diseases, especially hyperlipidemia, as discussed in this review. Furthermore, various strategies have been used for the efficient screening, development, and application of new hypolipidemic peptides. These include the use of phage display (for anti-obesity peptide), peptide mimetics (for anti-atherogenic peptide), and molecular targets such as CYP7A1 (for hypocholesterolemic peptide) and prohibitin (for anti-obesity peptide).
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Affiliation(s)
- Satoshi Nagaoka
- Department of Applied Life Science, Faculty of Applied Biological Sciences, Gifu University, Gifu, Japan
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Lee EJ, Kim MH, Kim YR, Park JW, Park WJ. Proteasome inhibition protects against diet-induced gallstone formation through modulation of cholesterol and bile acid homeostasis. Int J Mol Med 2017; 41:1715-1723. [PMID: 29286073 DOI: 10.3892/ijmm.2017.3326] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Accepted: 12/07/2017] [Indexed: 11/06/2022] Open
Abstract
Gallstone disease is one of the most prevalent and costly gastrointestinal disorders worldwide. Gallstones are formed in the biliary system by cholesterol secretions in bile, which result from excess cholesterol, a deficiency in bile salts or a combination of the two. The present study examined the effects of proteasome inhibition on gallstone formation using the proteasome inhibitors bortezomib (BT) and carfilzomib (CF). C57BL/6J mice were fed a lithogenic diet to generate gallstones and injected with BT or CF for 12 weeks. After 12 weeks of the lithogenic diet, 8 out of the 10 mice in the control group had developed gallstones, whereas none of the mice who received proteasome inhibitors had developed gallstones. Notably, the expression of genes associated with cholesterol synthesis (sterol regulatory element‑binding protein‑2 and 3‑hydroxy‑3‑methylglutaryl‑CoA reductase), cholesterol secretion [ATP‑binding cassette subfamily G member 5 (ABCG5) and ABCG8] and bile acid synthesis [cytochrome P450 family 7 subfamily A member 1 (Cyp7a1), Cyp7b1, Cyp27a1 and Cyp8b1] was reduced in the livers of mice injected with BT or CF. Cyp7a1 encodes cholesterol 7α‑hydroxylase, the rate‑limiting enzyme in the synthesis of bile acid from cholesterol. The present study therefore measured the expression levels of transcription factors that are known to inhibit Cyp7a1 expression, namely farnesoid X receptor (FXR), pregnane X receptor (PXR) and small heterodimer partner (SHP). Although FXR, PXR and SHP expression was predicted to increase in the presence of proteasome inhibitors, the expression levels were actually reduced; thus, it was concluded that they were not involved in the proteasome inhibition‑induced regulation of Cyp7a1. Further investigation of the mitogen‑activated protein kinase and protein kinase A (PKA) signaling pathways in human hepatoma cells revealed that proteasome inhibition‑induced c‑Jun N‑terminal kinase (JNK) phosphorylation reduced CYP7A1 and CYP27A1 expression. In addition, reduced PKA phosphorylation as a result of proteasome inhibition regulated ABCG5 and ABCG8 expression. In conclusion, these findings suggest that proteasome inhibition regulates cholesterol and biliary metabolism via the JNK and PKA pathways, and is a promising therapeutic strategy to prevent gallstone disease.
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Affiliation(s)
- Eun-Ji Lee
- Department of Biochemistry, School of Medicine, Gachon University, Incheon 21999, Republic of Korea
| | - Min Hee Kim
- Department of Biochemistry, School of Medicine, Gachon University, Incheon 21999, Republic of Korea
| | - Ye-Ryung Kim
- Department of Biochemistry, College of Medicine, Ewha Womans University, Seoul 07985, Republic of Korea
| | - Joo-Won Park
- Department of Biochemistry, College of Medicine, Ewha Womans University, Seoul 07985, Republic of Korea
| | - Woo-Jae Park
- Department of Biochemistry, School of Medicine, Gachon University, Incheon 21999, Republic of Korea
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Di Ciaula A, Garruti G, Lunardi Baccetto R, Molina-Molina E, Bonfrate L, Wang DQH, Portincasa P. Bile Acid Physiology. Ann Hepatol 2017; 16:s4-s14. [PMID: 29080336 DOI: 10.5604/01.3001.0010.5493] [Citation(s) in RCA: 262] [Impact Index Per Article: 37.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 09/06/2017] [Indexed: 02/05/2023]
Abstract
The primary bile acids (BAs) are synthetized from colesterol in the liver, conjugated to glycine or taurine to increase their solubility, secreted into bile, concentrated in the gallbladder during fasting, and expelled in the intestine in response to dietary fat, as well as bio-transformed in the colon to the secondary BAs by the gut microbiota, reabsorbed in the ileum and colon back to the liver, and minimally lost in the feces. BAs in the intestine not only regulate the digestion and absorption of cholesterol, triglycerides, and fat-soluble vitamins, but also play a key role as signaling molecules in modulating epithelial cell proliferation, gene expression, and lipid and glucose metabolism by activating farnesoid X receptor (FXR) and G-protein-coupled bile acid receptor-1 (GPBAR-1, also known as TGR5) in the liver, intestine, muscle and brown adipose tissue. Recent studies have revealed the metabolic pathways of FXR and GPBAR-1 involved in the biosynthesis and enterohepatic circulation of BAs and their functions as signaling molecules on lipid and glucose metabolism.
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Affiliation(s)
| | - Gabriella Garruti
- Department of Emergency and Organ Transplants, Unit of Endocrinology, University of Bari Medical School, Bari, Italy
| | - Raquel Lunardi Baccetto
- Clinica Medica "A. Murri", Department of Biomedical Sciences & Human Oncology, University of Bari Medical School, Bari, Italy
| | - Emilio Molina-Molina
- Clinica Medica "A. Murri", Department of Biomedical Sciences & Human Oncology, University of Bari Medical School, Bari, Italy
| | - Leonilde Bonfrate
- Clinica Medica "A. Murri", Department of Biomedical Sciences & Human Oncology, University of Bari Aldo Moro Medical School, Bari, Italy
| | - David Q-H Wang
- Department of Medicine, Division of Gastroenterology and Liver Diseases, Marion Bessin Liver Research Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Piero Portincasa
- Clinica Medica "A. Murri", Department of Biomedical Sciences & Human Oncology, University of Bari Medical School, Bari, Italy
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p38α MAPK antagonizing JNK to control the hepatic fat accumulation in pediatric patients onset intestinal failure. Cell Death Dis 2017; 8:e3110. [PMID: 29022907 PMCID: PMC5682685 DOI: 10.1038/cddis.2017.523] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Revised: 08/23/2017] [Accepted: 09/07/2017] [Indexed: 12/30/2022]
Abstract
The p38α mitogen-activated protein kinase (MAPK) has been related to gluconeogenesis and lipid metabolism. However, the roles and related mechanisms of p38α MAPK in intestinal failure (IF)-associated liver steatosis remained poor understood. Here, our experimental evidence suggested that p38α MAPK significantly suppressed the fat accumulation in livers of IF patients mainly through two mechanisms. On the one hand, p38α MAPK increased hepatic bile acid (BA) synthesis by upregulating the expression of the rate-limiting enzyme cholesterol 7-α-hydroxylase (CYP7A1) and peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α), which in turn activated the transcription of the CYP7A1. On the other hand, p38α MAPK promoted fatty acid (FA) β-oxidation via upregulating peroxisome proliferator-activated receptor alpha (PPARα) and its transcriptional target genes carnitine palmitoyltransferase 1A (CPT1A) and peroxisomal acyl-coenzyme aoxidase 1 (ACOX1). Dual luciferase assays indicated that p38α MAPK increased the transcription of PPARα, PGC-1α and CYP7A1 by upregulating their promoters’ activities. In addition, in vitro and in vivo assays indicated p38α MAPK negatively regulates the hepatic steatosis by controlling JNK activation. In conculsion, our findings demonstrate that hepatic p38α MAPK functions as a negative regulator of liver steatosis in maintaining BA synthesis and FAO by antagonizing the c-Jun N-terminal kinase (JNK).
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Comeglio P, Morelli A, Adorini L, Maggi M, Vignozzi L. Beneficial effects of bile acid receptor agonists in pulmonary disease models. Expert Opin Investig Drugs 2017; 26:1215-1228. [PMID: 28949776 DOI: 10.1080/13543784.2017.1385760] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
INTRODUCTION Bile acids act as steroid hormones, controlling lipid, glucose and energy metabolism, as well as inflammation and fibrosis. Their actions are implemented through activation of nuclear (FXR, VDR, PXR) and membrane G protein-coupled (TGR5, S1PR2) receptors. Areas covered: This review discusses the potential of FXR and TGR5 as therapeutic targets in the treatment of pulmonary disorders linked to metabolism and/or inflammation. Obeticholic acid (OCA) is the most clinically advanced bile acid-derived agonist for FXR-mediated anti-inflammatory and anti-fibrotic effects. It therefore represents an attractive pharmacological approach for the treatment of lung conditions characterized by vascular and endothelial dysfunctions. Expert opinion: Inflammation, vascular remodeling and fibrotic processes characterize the progression of pulmonary arterial hypertension (PAH) and idiopathic pulmonary fibrosis (IPF). These processes are only partially targeted by the available therapeutic options and still represent a relevant medical need. The results hereby summarized demonstrate OCA efficacy in preventing experimental lung disorders, i.e. monocrotaline-induced PAH and bleomycin-induced fibrosis, by abating proinflammatory and vascular remodeling progression. TGR5 is also expressed in the lung, and targeting the TGR5 pathway, using the TGR5 agonist INT-777 or the dual FXR/TGR5 agonist INT-767, could also contribute to the treatment of pulmonary disorders mediated by inflammation and fibrosis.
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Affiliation(s)
- Paolo Comeglio
- a Department of Biomedical, Experimental and Clinical Sciences , University of Florence , Florence , Italy
| | - Annamaria Morelli
- b Department of Experimental and Clinical Medicine , University of Florence , Florence , Italy
| | | | - Mario Maggi
- a Department of Biomedical, Experimental and Clinical Sciences , University of Florence , Florence , Italy
| | - Linda Vignozzi
- a Department of Biomedical, Experimental and Clinical Sciences , University of Florence , Florence , Italy
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Yan X, Li P, Tang Z, Feng B. The relationship between bile acid concentration, glucagon-like-peptide 1, fibroblast growth factor 15 and bile acid receptors in rats during progression of glucose intolerance. BMC Endocr Disord 2017; 17:60. [PMID: 28946907 PMCID: PMC5613331 DOI: 10.1186/s12902-017-0211-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Accepted: 09/19/2017] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Recent studies show that bile acids are involved in glucose and energy homeostasis through activation of G protein coupled membrane receptor (TGR5) and farnesoid X receptor (FXR). A few researches have explored changes of TGR5 and FXR in animals with impaired glucose regulation. This study aimed to observe changes of plasma total bile acids (TBA), glucagon-like-peptide 1 (GLP-1), fibroblast growth factor 15 (FGF15), intestinal expressions of TGR5 and FXR, and correlations between them in rats with glucose intolerance. METHODS Besides plasma fasting glucose, lipid, TBAs, alanine transaminase (ALT), active GLP-1(GLP-1A) and FGF15, a postprandial meal test was used to compare responses in glucose, insulin and GLP-1A among groups. The expressions of TGR5 and FXR in distal ileum and ascending colon were quantified by real-time PCR and western blot. RESULTS TGR5 expression was significantly decreased in distal ileum in DM group compared to other groups, and TGR5 and FXR expressions in ascending colon were also decreased in DM group compared to other groups. Correlation analysis showed correlations between TBA and GLP-1A or FGF15. GLP-1A was correlated with TGR5 mRNA expression in colon, and FGF15 was correlated with FXR mRNA expression in colon. CONCLUSIONS These results indicates that bile acid-TGR5/FXR axis contributes to glucose homeostasis.
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Affiliation(s)
- Xinfeng Yan
- Department of Endocrinology, Shanghai East Hospital, Tongji University School of Medicine, 150 Jimo Road, Shanghai, 200120 China
| | - Peicheng Li
- Department of Endocrinology, Shanghai East Hospital, Tongji University School of Medicine, 150 Jimo Road, Shanghai, 200120 China
| | - Zhaosheng Tang
- Department of Endocrinology, Shanghai East Hospital, Tongji University School of Medicine, 150 Jimo Road, Shanghai, 200120 China
| | - Bo Feng
- Department of Endocrinology, Shanghai East Hospital, Tongji University School of Medicine, 150 Jimo Road, Shanghai, 200120 China
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Dabur R. Identification of molecular pathways affected by treatment with heartwood water extract of Pterocarpus marsupium in MCF 7 cancer cell line. J Herb Med 2017. [DOI: 10.1016/j.hermed.2017.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Bacterial bile salt hydrolase: an intestinal microbiome target for enhanced animal health. Anim Health Res Rev 2017; 17:148-158. [PMID: 28155801 DOI: 10.1017/s1466252316000153] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
To effectively mitigate antimicrobial resistance in the agricultural ecosystem, there is an increasing pressure to reduce and eliminate the use of in-feed antibiotics for growth promotion and disease prevention in food animals. However, limiting antibiotic use could compromise animal production efficiency and health. Thus, there is an urgent need to develop effective alternatives to antibiotic growth promoters (AGPs). Increasing evidence has shown that the growth-promoting effect of AGPs was highly correlated with the reduced activity of bile salt hydrolase (BSH), an intestinal bacterial enzyme that has a negative impact on host fat digestion and energy harvest; consistent with this finding, the population of Lactobacillus species, the major intestinal BSH-producer, was significantly reduced in response to AGP use. Thus, BSH is a key mechanistic microbiome target for developing novel alternatives to AGPs. Despite recent significant progress in the characterization of diverse BSH enzymes, research on BSH is still in its infancy. This review is focused on the function of BSH and its significant impacts on host physiology in human beings, laboratory animals and food animals. The gaps in BSH-based translational microbiome research for enhanced animal health are also identified and discussed.
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Dai M, Yang J, Xie M, Lin J, Luo M, Hua H, Xu G, Lin H, Song D, Cheng Y, Guo B, Zhao J, Gonzalez FJ, Liu A. Inhibition of JNK signalling mediates PPARα-dependent protection against intrahepatic cholestasis by fenofibrate. Br J Pharmacol 2017. [PMID: 28646549 DOI: 10.1111/bph.13928] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND AND PURPOSE Fenofibrate, a PPARα agonist, is the most widely prescribed drug for treating hyperlipidaemia. Although fibrate drugs are reported to be beneficial for cholestasis, their underlying mechanism has not been determined. EXPERIMENTAL APPROACH Wild-type mice and Pparα-null mice were pretreated orally with fenofibrate for 3 days, following which α-naphthylisothiocyanate (ANIT) was administered to induce cholestasis. The PPARα agonist WY14643 and JNK inhibitor SP600125 were used to determine the role of PPARα and the JNK pathway, respectively, in cholestatic liver injury. The same fenofibrate regimen was applied to investigate its beneficial effects on sclerosing cholangitis in a DDC-induced cholestatic model. KEY RESULTS Fenofibrate, 25 mg·kg-1 twice a day, totally attenuated ANIT-induced cholestasis and liver injury as indicated by biochemical and histological analyses. This protection occurred in wild-type, but not in Pparα-null, mice. Alterations in bile acid synthesis and transport were found to be an adaptive response rather than a direct effect of fenofibrate. WY14643 attenuated ANIT-induced cholestasis and liver injury coincident with inhibition of JNK signalling. Although SP600125 did not affect cholestasis, it inhibited liver injury in the ANIT model when the dose of fenofibrate used was ineffective. Fenofibrate was also revealed to have a beneficial effect in the sclerosing cholangitis model. CONCLUSIONS AND IMPLICATIONS These data suggest that the protective effects of fenofibrate against cholestasis-induced hepatic injury are dependent on PPARα and fenofibrate dose, and are mediated through inhibition of JNK signalling. This mechanism of fenofibrate protection against intrahepatic cholestasis may offer additional therapeutic opportunities for cholestatic liver diseases.
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Affiliation(s)
- Manyun Dai
- Medical School of Ningbo University, Ningbo, China
| | - Julin Yang
- Ningbo College of Health Sciences, Ningbo, China
| | - Minzhu Xie
- Medical School of Ningbo University, Ningbo, China
| | - Jiao Lin
- Medical School of Ningbo University, Ningbo, China
| | - Min Luo
- Medical School of Ningbo University, Ningbo, China
| | - Huiying Hua
- Medical School of Ningbo University, Ningbo, China
| | - Gangming Xu
- Medical School of Ningbo University, Ningbo, China
| | - Hante Lin
- Medical School of Ningbo University, Ningbo, China
| | - Danjun Song
- Medical School of Ningbo University, Ningbo, China
| | | | - Bin Guo
- Hunan Normal University, Changsha, China
| | - Jinshun Zhao
- Medical School of Ningbo University, Ningbo, China
| | - Frank J Gonzalez
- Laboratory of Metabolism, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Aiming Liu
- Medical School of Ningbo University, Ningbo, China
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He K, Ma H, Xu H, Zou Z, Feng M, Li X, Ye X. Anti-hyperlipidemic effects of Rhizoma Coptidis alkaloids are achieved through modulation of the enterohepatic circulation of bile acids and cross-talk between the gut microbiota and the liver. J Funct Foods 2017. [DOI: 10.1016/j.jff.2017.04.041] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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Hosomi R, Maeda H, Ikeda Y, Toda Y, Yoshida M, Fukunaga K. Differential Effects of Cod Proteins and Tuna Proteins on Serum and Liver Lipid Profiles in Rats Fed Non-Cholesterol- and Cholesterol-Containing Diets. Prev Nutr Food Sci 2017; 22:90-99. [PMID: 28702425 PMCID: PMC5503417 DOI: 10.3746/pnf.2017.22.2.90] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 03/17/2017] [Indexed: 11/08/2022] Open
Abstract
Fish muscles are classified into white and red muscles, and the chemical composition of the two fish muscles have many differences. Few reports have assessed the health-promoting functions of white fish muscle proteins (WFP) and red fish muscle proteins (RFP). We therefore evaluated the mechanisms underlying the alteration of lipid profiles and cholesterol metabolism following the intake of WFP prepared from cod and RFP prepared from light muscles of tuna. Male Wistar rats were divided into six dietary groups: casein (23%), WFP (23%), and RFP (23%), with or without 0.5% cholesterol and 0.1% sodium cholate. Compared to the WFP-containing diet, the RFP-containing diet supplemented with cholesterol and sodium cholate significantly increased serum and liver cholesterol contents. However, in the RFP groups, an alteration in cholesterol metabolism including an increased tendency to excrete fecal sterols and hepatic cholesterol 7α-hydroxylase was related to the reduction of hepatic cholesterol contents. This phenomenon might be related to the tendency of an increased food intake in RFP-containing diets. These results highlight the differential effects of WFP and RFP on serum and liver lipid profiles of Wistar rats fed non-cholesterol- or cholesterol-containing diets under no fasting condition.
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Affiliation(s)
- Ryota Hosomi
- Laboratory of Food and Nutritional Sciences, Faculty of Chemistry, Materials, and Bioengineering, Kansai University, Osaka 564-8680, Japan
| | - Hayato Maeda
- Laboratory of Food Chemistry, Faculty of Agriculture and Life Science, Hirosaki University, Aomori 036-8561, Japan
| | - Yuki Ikeda
- Laboratory of Food and Nutritional Sciences, Faculty of Chemistry, Materials, and Bioengineering, Kansai University, Osaka 564-8680, Japan
| | - Yuko Toda
- Laboratory of Food and Nutritional Sciences, Faculty of Chemistry, Materials, and Bioengineering, Kansai University, Osaka 564-8680, Japan
| | - Munehiro Yoshida
- Laboratory of Food and Nutritional Sciences, Faculty of Chemistry, Materials, and Bioengineering, Kansai University, Osaka 564-8680, Japan
| | - Kenji Fukunaga
- Laboratory of Food and Nutritional Sciences, Faculty of Chemistry, Materials, and Bioengineering, Kansai University, Osaka 564-8680, Japan
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Feng L, Yuen YL, Xu J, Liu X, Chan MYC, Wang K, Fong WP, Cheung WT, Lee SST. Identification and characterization of a novel PPARα-regulated and 7α-hydroxyl bile acid-preferring cytosolic sulfotransferase mL-STL (Sult2a8). J Lipid Res 2017; 58:1114-1131. [PMID: 28442498 DOI: 10.1194/jlr.m074302] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Revised: 04/19/2017] [Indexed: 12/25/2022] Open
Abstract
PPARα has been known to play a pivotal role in orchestrating lipid, glucose, and amino acid metabolism via transcriptional regulation of its target gene expression during energy deprivation. Recent evidence has also suggested that PPARα is involved in bile acid metabolism, but how PPARα modulates the homeostasis of bile acids during fasting is still not clear. In a mechanistic study aiming to dissect the spectrum of PPARα target genes involved in metabolic response to fasting, we identified a novel mouse gene (herein named mL-STL for mouse liver-sulfotransferase-like) that shared extensive homology with the Sult2a subfamily of a superfamily of cytosolic sulfotransferases, implying its potential function in sulfonation. The mL-STL gene expressed predominantly in liver in fed state, but PPARα was required to sustain its expression during fasting, suggesting a critical role of PPARα in regulating the mL-STL-mediated sulfonation during fasting. Functional studies using recombinant His-tagged mL-STL protein revealed its narrow sulfonating activities toward 7α-hydroxyl primary bile acids, including cholic acid, chenodeoxycholic acid, and α-muricholic acid, and thus suggesting that mL-STL may be the major hepatic bile acid sulfonating enzyme in mice. Together, these studies identified a novel PPARα-dependent gene and uncovered a new role of PPARα as being an essential regulator in bile acid biotransformation via sulfonation during fasting.
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Affiliation(s)
- Lu Feng
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR
| | - Yee-Lok Yuen
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR
| | - Jian Xu
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR
| | - Xing Liu
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR
| | - Martin Yan-Chun Chan
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR
| | - Kai Wang
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR
| | - Wing-Ping Fong
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR
| | - Wing-Tai Cheung
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR
| | - Susanna Sau-Tuen Lee
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR
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Wruck W, Adjaye J. Meta-analysis reveals up-regulation of cholesterol processes in non-alcoholic and down-regulation in alcoholic fatty liver disease. World J Hepatol 2017; 9:443-454. [PMID: 28357032 PMCID: PMC5355767 DOI: 10.4254/wjh.v9.i8.443] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 11/29/2016] [Accepted: 12/13/2016] [Indexed: 02/06/2023] Open
Abstract
AIM To compare transcriptomes of non-alcoholic fatty liver disease (NAFLD) and alcoholic liver disease (ALD) in a meta-analysis of liver biopsies. METHODS Employing transcriptome data from patient liver biopsies retrieved from several public repositories we performed a meta-analysis comparing ALD and NAFLD. RESULTS We observed predominating commonalities at the transcriptome level between ALD and NAFLD, most prominently numerous down-regulated metabolic pathways and cytochrome-related pathways and a few up-regulated pathways which include ECM-receptor interaction, phagosome and lysosome. However some pathways were regulated in opposite directions in ALD and NAFLD, for example, glycolysis was down-regulated in ALD and up-regulated in NAFLD. Interestingly, we found rate-limiting genes such as HMGCR, SQLE and CYP7A1 which are associated with cholesterol processes adversely regulated between ALD (down-regulated) and NAFLD (up-regulated). We propose that similar phenotypes in both diseases may be due to a lower level of the enzyme CYP7A1 compared to the cholesterol synthesis enzymes HMGCR and SQLE. Additionally, we provide a compendium of comparative KEGG pathways regulation in ALD and NAFLD. CONCLUSION Our finding of adversely regulated cholesterol processes in ALD and NAFLD draws the focus to regulation of cholesterol secretion into bile. Thus, it will be interesting to further investigate CYP7A1-mediated cholesterol secretion into bile - also as possible drug targets. The list of potential novel biomarkers may assist differential diagnosis of ALD and NAFLD.
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Affiliation(s)
- Wasco Wruck
- Wasco Wruck, James Adjaye, Medical Faculty, Institute for Stem Cell Research and Regenerative Medicine, Heinrich Heine University, 40225 Düsseldorf, Germany
| | - James Adjaye
- Wasco Wruck, James Adjaye, Medical Faculty, Institute for Stem Cell Research and Regenerative Medicine, Heinrich Heine University, 40225 Düsseldorf, Germany
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Guo J, Gao Y, Cao X, Zhang J, Chen W. Cholesterol-lowing effect of taurine in HepG2 cell. Lipids Health Dis 2017; 16:56. [PMID: 28302129 PMCID: PMC5356372 DOI: 10.1186/s12944-017-0444-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 03/07/2017] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND A number of studies indicate that taurine promotes cholesterol conversion to bile acids by upregulating CYP7A1 gene expression. Few in vitro studies are concerned the concentration change of cholesterol and its product of bile acids, and the molecular mechanism of CYP7A1 induction by taurine. METHODS The levels of intracellular total cholesterol (TC), free cholesterol (FC), cholesterol ester (EC), total bile acids (TBA) and medium TBA were determined after HepG2 cells were cultured for 24/48 h in DMEM supplemented with taurine at the final concentrations of 1/10/20 mM respectively. The protein expressions of CYP7A1, MEK1/2, c-Jun, p-c-Jun and HNF-4α were detected. RESULTS Taurine significantly reduced cellular TC and FC in dose -and time-dependent ways, and obviously increased intracellular/medium TBA and CYP7A1 expressions. There was no change in c-Jun expression, but the protein expressions of MEK1/2 and p-c-Jun were increased at 24 h and inhibited at 48 h by 20 mM taurine while HNF4α was induced after both of the 24 h and 48 h treatment. CONCLUSION Taurine could enhance CYP7A1 expression by inducing HNF4α and inhibiting MEK1/2 and p-c-Jun expressions to promote intracellular cholesterol metabolism.
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Affiliation(s)
- Junxia Guo
- Food Science Department, College of Biochemical Engineering, Beijing Union University, Fatou west 18#, Chaoyang District, Beijing, 100023, People's Republic of China.,Beijing Key Laboratory of Bioactive Substances and Functional Foods, Beijing Union University, Beijing, 100191, People's Republic of China
| | - Ya Gao
- Beijing Key Laboratory of Bioactive Substances and Functional Foods, Beijing Union University, Beijing, 100191, People's Republic of China
| | - Xuelian Cao
- Beijing Key Laboratory of Bioactive Substances and Functional Foods, Beijing Union University, Beijing, 100191, People's Republic of China
| | - Jing Zhang
- Food Science Department, College of Biochemical Engineering, Beijing Union University, Fatou west 18#, Chaoyang District, Beijing, 100023, People's Republic of China.,Beijing Key Laboratory of Bioactive Substances and Functional Foods, Beijing Union University, Beijing, 100191, People's Republic of China
| | - Wen Chen
- Food Science Department, College of Biochemical Engineering, Beijing Union University, Fatou west 18#, Chaoyang District, Beijing, 100023, People's Republic of China. .,Beijing Key Laboratory of Bioactive Substances and Functional Foods, Beijing Union University, Beijing, 100191, People's Republic of China.
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Abu-Farsakh S, Wu T, Lalonde A, Sun J, Zhou Z. High expression of Claudin-2 in esophageal carcinoma and precancerous lesions is significantly associated with the bile salt receptors VDR and TGR5. BMC Gastroenterol 2017; 17:33. [PMID: 28212604 PMCID: PMC5316202 DOI: 10.1186/s12876-017-0590-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 02/14/2017] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Claudins are a family of integral membrane proteins and are components of tight junctions (TJs). Many TJ proteins are known to tighten the cell structure and maintain a barrier. Claudin-2 forms gated paracellular channels and allows sodium ions and other small positively charged ions to cross between adjacent cells. Recently, we found that vitamin D receptor (VDR) enhanced Claudin-2 expression in colon and that bile salt receptors VDR and Takeda G-protein coupled receptor5 (TGR5) were highly expressed in esophageal adenocarcinoma (EAC) and precancerous lesions. Here, we examined the expression of Claudin-2 in EAC and precancerous lesions and its association with VDR and TGR5 expression. METHODS Claudin-2 expression was examined by immunohistochemistry on tissue microarrays, containing EAC, high grade dysplasia (HGD), low grade dysplasia (LGD), Barrett's esophagus (BE), columnar cell metaplasia (CM), squamous cell carcinoma (SCC), and squamous epithelium (SE) cases. Intensity (0 to 3) and percentage were scored for each case. High expression was defined as 2-3 intensity in ≥ 10% of cells. RESULTS Claudin-2 was highly expressed in 77% EAC (86/111), 38% HGD (5/13), 61% LGD (17/28), 46% BE (18/39), 45% CM (29/65), 88% SCC (23/26), and 14% SE (11/76). It was significantly more highly-expressed in EAC, SCC and glandular lesions than in SE and more in EAC than in BE and CM. A significant association was found between Claudin-2 expression and VDR and TGR5 expression. No significant association was found between expression of Claudin-2 and age, gender, grade, stage, or patients' survival time in EAC and SCC. CONCLUSIONS We conclude that Claudin-2 expression is significantly associated with bile acid receptors VDR and TGR5 expression. Our studies identify a novel role of a tight junction protein in the development and progression of esophageal mucosal metaplasia, dysplasia and carcinoma.
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Affiliation(s)
- Sohaib Abu-Farsakh
- Department of Pathology and Laboratory Medicine, University of Rochester, Box 626, 601 Elmwood Ave, Rochester, NY, 14642, USA
| | - Tongtong Wu
- Department of Biostatistics and Computational Biology, University of Rochester Medical Center, 265 Crittenden Boulevard CU 420630, Rochester, NY, 14642-0630, USA
| | - Amy Lalonde
- Department of Biostatistics and Computational Biology, University of Rochester Medical Center, 265 Crittenden Boulevard CU 420630, Rochester, NY, 14642-0630, USA
| | - Jun Sun
- Department of Medicine, Division of Gastroenterology and Hepatology, University of Illinois College of Medicine, 840 South Wood Street MC 716, Chicago, IL, 60612, USA
| | - Zhongren Zhou
- Department of Pathology and Laboratory Medicine, University of Rochester, Box 626, 601 Elmwood Ave, Rochester, NY, 14642, USA.
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Valanejad L, Nadolny C, Shiffka S, Chen Y, You S, Deng R. Differential Feedback Regulation of Δ4-3-Oxosteroid 5β-Reductase Expression by Bile Acids. PLoS One 2017; 12:e0170960. [PMID: 28125709 PMCID: PMC5268776 DOI: 10.1371/journal.pone.0170960] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 01/14/2017] [Indexed: 02/08/2023] Open
Abstract
Δ4-3-oxosteroid 5β-reductase is member D1 of the aldo-keto reductase family 1 (AKR1D1), which catalyzes 5β-reduction of molecules with a 3-oxo-4-ene structure. Bile acid intermediates and most of the steroid hormones carry the 3-oxo-4-ene structure. Therefore, AKR1D1 plays critical roles in both bile acid synthesis and steroid hormone metabolism. Currently our understanding on transcriptional regulation of AKR1D1 under physiological and pathological conditions is very limited. In this study, we investigated the regulatory effects of primary bile acids, chenodeoxycholic acid (CDCA) and cholic acid (CA), on AKR1D1 expression. The expression levels of AKR1D1 mRNA and protein in vitro and in vivo following bile acid treatments were determined by real-time PCR and Western blotting. We found that CDCA markedly repressed AKR1D1 expression in vitro in human hepatoma HepG2 cells and in vivo in mice. On the contrary, CA significantly upregulated AKR1D1 expression in HepG2 cells and in mice. Further mechanistic investigations revealed that the farnesoid x receptor (FXR) signaling pathway was not involved in regulating AKR1D1 by bile acids. Instead, CDCA and CA regulated AKR1D1 through the mitogen-activated protein kinases/c-Jun N-terminal kinases (MAPK/JNK) signaling pathway. Inhibition of the MAPK/JNK pathway effectively abolished CDCA and CA-mediated regulation of AKR1D1. It was thus determined that AKR1D1 expression was regulated by CDCA and CA through modulating the MAPK/JNK signaling pathway. In conclusion, AKR1D1 expression was differentially regulated by primary bile acids through negative and positive feedback mechanisms. The findings indicated that both bile acid concentrations and compositions play important roles in regulating AKR1D1 expression, and consequently bile acid synthesis and steroid hormone metabolism.
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Affiliation(s)
- Leila Valanejad
- Department of Biomedical and Pharmaceutical Sciences, Center for Pharmacogenomics and Molecular Therapy, College of Pharmacy, University of Rhode Island, Kingston, Rhode Island, United States of America
| | - Christina Nadolny
- Department of Biomedical and Pharmaceutical Sciences, Center for Pharmacogenomics and Molecular Therapy, College of Pharmacy, University of Rhode Island, Kingston, Rhode Island, United States of America
| | - Stephanie Shiffka
- Department of Biomedical and Pharmaceutical Sciences, Center for Pharmacogenomics and Molecular Therapy, College of Pharmacy, University of Rhode Island, Kingston, Rhode Island, United States of America
| | - Yuan Chen
- Department of Biomedical and Pharmaceutical Sciences, Center for Pharmacogenomics and Molecular Therapy, College of Pharmacy, University of Rhode Island, Kingston, Rhode Island, United States of America
| | - Sangmin You
- Department of Biomedical and Pharmaceutical Sciences, Center for Pharmacogenomics and Molecular Therapy, College of Pharmacy, University of Rhode Island, Kingston, Rhode Island, United States of America
| | - Ruitang Deng
- Department of Biomedical and Pharmaceutical Sciences, Center for Pharmacogenomics and Molecular Therapy, College of Pharmacy, University of Rhode Island, Kingston, Rhode Island, United States of America
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Liu Z, Zhang Y, Zhang R, Gu L, Chen X. Promotion of classic neutral bile acids synthesis pathway is responsible for cholesterol-lowing effect of Si-miao-yong-an decoction: Application of LC-MS/MS method to determine 6 major bile acids in rat liver and plasma. J Pharm Biomed Anal 2016; 135:167-175. [PMID: 28033554 DOI: 10.1016/j.jpba.2016.12.021] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 12/04/2016] [Accepted: 12/15/2016] [Indexed: 12/24/2022]
Abstract
Si-miao-yong-an decoction (SMYAD), a traditional Chinese medicine formula, significantly reduced plasma TC, LDL-c levels and increased HDL-c level in hyperlipidemia rats. Liver function test and tissue section examination indicated that SMYAD improved liver function and reduced fat accumulation in hyperlipidemia rat liver. A LC-MS/MS method was established and well validated to evaluate major bile acids derived from cholesterol metabolism through the classic neutral pathway and the alternative acidic pathway (cholic acid, chenodeoxycholic acid and their taurine and glycine conjugates) in liver and plasma. Increased total 6 bile acids concentrations in both liver and plasma were observed after oral administration of 12g/kg/d, 24g/kg/d and 36g/kg/d of SMYAD in a dose dependent manner which contributed to eliminate of cholesterol. Cholic acid, taurocholic acid and glycocholic acid act as the main products of bile acid classic neutral synthesis pathway and show sharp increase (p<0.01) after treatment of SMYAD at dosage of 24-36g/kg/d. For liver samples, taurocholic acid level act as the largest growth section, while in plasma samples, cholic acid act as the largest growth section after SMYAD treatment, compared with Model group. By contrast, the main products of alternative acidic pathway (chenodeoxycholic acid and its glycine and taurine conjugates) show no significant increase after treatment of SMYAD. In conclusion, the cholesterol lowing effect of SMYAD may be related with the accelerated transformation of cholesterol into bile acids through the classic neutral pathway.
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Affiliation(s)
- Ziying Liu
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, China
| | - Yu Zhang
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, China
| | - Ruowen Zhang
- Department of Pathology, School of Medicine and Health Science, University of North Dakota, 501 North Columbia Rd., Grand Forks, ND 58202 USA
| | - Liqiang Gu
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, China
| | - Xiaohui Chen
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang, 110016, China.
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Henkel AS, LeCuyer B, Olivares S, Green RM. Endoplasmic Reticulum Stress Regulates Hepatic Bile Acid Metabolism in Mice. Cell Mol Gastroenterol Hepatol 2016; 3:261-271. [PMID: 28275692 PMCID: PMC5331781 DOI: 10.1016/j.jcmgh.2016.11.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 11/01/2016] [Indexed: 12/31/2022]
Abstract
BACKGROUND & AIMS Cholestasis promotes endoplasmic reticulum (ER) stress in the liver, however, the effect of ER stress on hepatic bile acid metabolism is unknown. We aim to determine the effect of ER stress on hepatic bile acid synthesis and transport in mice. METHODS ER stress was induced pharmacologically in C57BL/6J mice and human hepatoma (HepG2) cells. The hepatic expression of genes controlling bile acid synthesis and transport was determined. To measure the activity of the primary bile acid synthetic pathway, the concentration of 7α-hydroxy-4-cholesten-3-1 was measured in plasma. RESULTS Induction of ER stress in mice and HepG2 cells rapidly suppressed the hepatic expression of the primary bile acid synthetic enzyme, cholesterol 7α-hydroxylase. Plasma levels of 7α-hydroxy-4-cholesten-3-1 were reduced in mice subjected to ER stress, indicating impaired bile acid synthesis. Induction of ER stress in mice and HepG2 cells increased expression of the bile salt export pump (adenosine triphosphate binding cassette [Abc]b11) and a bile salt efflux pump (Abcc3). The observed regulation of Cyp7a1, Abcb11, and Abcc3 occurred in the absence of hepatic inflammatory cytokine activation and was not dependent on activation of hepatic small heterodimer partner or intestinal fibroblast growth factor 15. Consistent with suppressed bile acid synthesis and enhanced bile acid export from hepatocytes, prolonged ER stress decreased the hepatic bile acid content in mice. CONCLUSIONS Induction of ER stress in mice suppresses bile acid synthesis and enhances bile acid removal from hepatocytes independently of established bile acid regulatory pathways. These data show a novel function of the ER stress response in regulating bile acid metabolism.
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Key Words
- 7α-Hydroxy-4-Cholesten-3-1
- ABC, adenosine triphosphate binding cassette
- Bile Acid Synthesis
- C4, 7α-hydroxy-4-cholesten-3-1
- CYP7A1, cholesterol 7α-hydroxylase
- Cyp7a1
- DMEM, Dulbecco's modified Eagle medium
- DMSO, dimethyl sulfoxide
- ER, endoplasmic reticulum
- ERK, extracellular signaling-regulated kinase
- FGF, fibroblast growth factor
- FXR, farnesoid X receptor
- IL, interleukin
- IRE1α, inositol requiring enzyme 1α
- JNK, c-Jun-N-terminal kinase
- NTCP, sodium/taurocholate cotransporter
- RIDD, regulated inositol requiring enzyme 1α–dependent messenger RNA decay
- SHP, small heterodimer partner
- UPR, unfolded protein response
- Unfolded Protein Response
- mRNA, messenger RNA
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Affiliation(s)
- Anne S. Henkel
- Correspondence Address correspondence to: Anne S. Henkel, MD, 320 East Superior Street, Tarry 15-705, Chicago, Illinois 60611. fax: (312) 908-9032.320 East Superior StreetTarry 15-705ChicagoIllinois 60611
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