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Gao C, Koko MY, Hong W, Gankhuyag J, Hui M, Gantumur MA, Dong N. Protective Properties of Intestinal Alkaline Phosphatase Supplementation on the Intestinal Barrier: Interactions and Effects. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:27-45. [PMID: 37964463 DOI: 10.1021/acs.jafc.3c05119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2023]
Abstract
The intestinal barrier is critical for maintaining intestinal homeostasis, and its dysfunction is associated with various diseases. Recent findings have revealed the multifunctional role of intestinal alkaline phosphatase (IAP) in diverse biological processes, including gut health maintenance and function. This review summarizes the protective effects of IAP on intestinal barrier integrity, encompassing the physical, chemical, microbial, and immune barriers. We discuss the results and insights from in vitro, animal model, and clinical studies as well as the available evidence regarding the impact of diet on IAP activity and expression. IAP can also be used as an indicator to assess intestinal-barrier-related diseases. Further research into the mechanisms of action and long-term health effects of IAP in maintaining overall intestinal health is essential for its future use as a dietary supplement or functional component in medical foods.
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Affiliation(s)
- Chenzhe Gao
- Laboratory of Molecular Nutrition and Immunity, College of Animal Science and Technology, Northeast Agricultural University, Harbin, People's Republic of China 150030
- College of Food, Northeast Agricultural University, Harbin, People's Republic of China 150030
| | - Marwa Yagoub Koko
- College of Food, Northeast Agricultural University, Harbin, People's Republic of China 150030
| | - Weichen Hong
- Laboratory of Molecular Nutrition and Immunity, College of Animal Science and Technology, Northeast Agricultural University, Harbin, People's Republic of China 150030
| | - Javzan Gankhuyag
- College of Food, Northeast Agricultural University, Harbin, People's Republic of China 150030
| | - Mizhou Hui
- College of Food, Northeast Agricultural University, Harbin, People's Republic of China 150030
| | - Munkh-Amgalan Gantumur
- College of Food, Northeast Agricultural University, Harbin, People's Republic of China 150030
| | - Na Dong
- Laboratory of Molecular Nutrition and Immunity, College of Animal Science and Technology, Northeast Agricultural University, Harbin, People's Republic of China 150030
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Zhu L, Dou Z, Wu W, Hou Q, Wang S, Yuan Z, Li B, Liu J. Ghrelin/GHSR Axis Induced M2 Macrophage and Alleviated Intestinal Barrier Dysfunction in a Sepsis Rat Model by Inactivating E2F1/NF- κB Signaling. Can J Gastroenterol Hepatol 2023; 2023:1629777. [PMID: 38187112 PMCID: PMC10769719 DOI: 10.1155/2023/1629777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 10/20/2023] [Accepted: 12/11/2023] [Indexed: 01/09/2024] Open
Abstract
Sepsis is an inflammatory reaction disorder state that is induced by infection. The activation and regulation of the immune system play an essential role in the development of sepsis. Our previous studies have shown that ghrelin ameliorates intestinal dysfunction in sepsis. Very little is known about the mechanism of ghrelin and its receptor (GHSR) on the intestinal barrier and the immune function of macrophage regulation. Our research is to investigate the regulatory effect and molecular mechanism of the ghrelin/GHSR axis on intestinal dysfunction and macrophage polarization in septic rats. A rat model of sepsis was established by cecal ligation and puncture (CLP) operation. Then, the sepsis rats were treated with a ghrelin receptor agonist (TZP-101) or ghrelin inhibitor (obestatin). The results suggested that TZP-101 further enhanced ghrelin and GHSR expressions in the colon and spleen of septic rats and obestatin showed the opposite results. Ghrelin/GHSR axis ameliorated colonic structural destruction and intestinal epithelial tight junction injury in septic rats. In addition, the ghrelin/GHSR axis promoted M2-type polarization of macrophages, which was characterized by the decreases of IL-1β, IL-6, and TNF-α, as well as the increase of IL-10. Mechanistically, the ghrelin/GHSR axis promoted E2F2 expression and suppressed the activation of the NF-κB signaling pathway in septic rats. Collectively, targeting ghrelin/GHSR during sepsis may represent a novel therapeutic approach for the treatment of intestinal barrier injury.
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Affiliation(s)
- Lei Zhu
- Department of Intensive Care Medicine, The First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Zhimin Dou
- Department of Intensive Care Medicine, The First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Wei Wu
- Department of Intensive Care Medicine, The First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Qiliang Hou
- Department of Intensive Care Medicine, The First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Sen Wang
- Department of Intensive Care Medicine, The First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Ziqian Yuan
- Department of Intensive Care Medicine, The First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Bin Li
- Department of Intensive Care Medicine, The First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Jian Liu
- Department of Intensive Care Medicine, The First Hospital of Lanzhou University, Lanzhou 730000, China
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Luiskari L, Launonen H, Lindén J, Lehto M, Vapaatalo H, Salmenkari H, Korpela R. Ketogenic Diet High in Saturated Fat Promotes Colonic Claudin Expression without Changes in Intestinal Permeability to Iohexol in Healthy Mice. Nutrients 2023; 16:18. [PMID: 38201850 PMCID: PMC10780785 DOI: 10.3390/nu16010018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 12/11/2023] [Accepted: 12/16/2023] [Indexed: 01/12/2024] Open
Abstract
Ketogenic diets (KDs) have been studied in preclinical models of intestinal diseases. However, little is known of how the fat source of these diets influences the intestinal barrier. Herein, we studied the impact of four-week feeding with KD high either in saturated fatty acids (SFA-KD) or polyunsaturated linoleic acid (LA-KD) on paracellular permeability of the intestine to iohexol in healthy male C57BL/6J mice. We investigated jejunal and colonic tight junction protein expression, histological changes, and inflammatory markers (Il1b, Il6, Tnf, and Lcn2), as well as the activity and expression of intestinal alkaline phosphatase (IAP) in feces and jejunal tissue, respectively, and plasma lipopolysaccharide. KDs did not change intestinal permeability to iohexol after two or twenty-six days of feeding regardless of fat quality. SFA-KD, but not LA-KD, upregulated the colonic expression of tight junction proteins claudin-1 and -4, as well as the activity of IAP. Both KDs resulted in increased epithelial vacuolation in jejunum, and this was pronounced in SFA-KD. Jejunal Il1β expression was lower and colonic Il6 expression higher in LA-KD compared to SFA-KD. In colon, Tnf mRNA was increased in LA-KD when compared to controls. Overall, the results suggest that KDs do not influence intestinal permeability to iohexol but elicit changes in colonic tight junction proteins and inflammatory markers in both jejunum and colon. Future research will show whether these changes become of importance upon proinflammatory insults.
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Affiliation(s)
- Lotta Luiskari
- Department of Pharmacology, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland; (H.L.); (H.V.)
- Human Microbiome Research Program, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
| | - Hanna Launonen
- Department of Pharmacology, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland; (H.L.); (H.V.)
| | - Jere Lindén
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, 00014 Helsinki, Finland;
- Finnish Centre for Laboratory Animal Pathology, Helsinki Institute of Life Science, University of Helsinki, 00014 Helsinki, Finland
| | - Markku Lehto
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, 00290 Helsinki, Finland; (M.L.); (H.S.)
- Department of Nephrology, University of Helsinki and Helsinki University Hospital, 00290 Helsinki, Finland
- Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
| | - Heikki Vapaatalo
- Department of Pharmacology, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland; (H.L.); (H.V.)
| | - Hanne Salmenkari
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, 00290 Helsinki, Finland; (M.L.); (H.S.)
- Department of Nephrology, University of Helsinki and Helsinki University Hospital, 00290 Helsinki, Finland
- Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
| | - Riitta Korpela
- Department of Pharmacology, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland; (H.L.); (H.V.)
- Human Microbiome Research Program, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
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Effects of Shenling Chengqi Decoction on Gastrointestinal Function and Immune Status of Patients with Gastrointestinal Injury in Severe Sepsis. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2022; 2022:2219451. [PMID: 35860190 PMCID: PMC9293499 DOI: 10.1155/2022/2219451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/17/2022] [Accepted: 06/18/2022] [Indexed: 11/17/2022]
Abstract
Objective To investigate the effects of Shenling Chengqi decoction combined with routine treatment on gastrointestinal function and immune status of patients with gastrointestinal injury in severe sepsis. Methods 160 patients with sepsis were randomly divided into a control group (n = 80) and observation group (n = 80). The control group was given routine treatment such as anti-infection and vasoactive drugs. The observation group was treated with Shenling Chengqi decoction on the basis of routine treatment for 7 days. The improvement of gastrointestinal symptoms, nutritional status, gastrointestinal dynamics, inflammatory response, and immune function was observed before and after treatment. The outcome indicators were evaluation of gastrointestinal symptoms, evaluation of disease severity, nutritional status, gastrointestinal dynamic indexes, inflammatory indexes, and immune function indexes. SPSS 22.0 statistical software was used for data processing. The paired t-test was used for comparison before and after treatment. Results Compared with the control group, the disappearance time of reflux, vomiting, and recovery time of bowel sounds in the observation group were significantly shorter (P < 0.05), and the number of defecation per day was significantly higher than that in the control group (P < 0.05). After 3 and 7 days of treatment, the APACHE II score, SIRS score, serum gas, IgA, IgM, serum hs-CRP, TNF, and PCT of the two groups were significantly lower than those before treatment (P < 0.05), and the scores of the observation group were significantly lower than those of the control group (P < 0.05). The levels of SS and MOT were significantly higher than those before treatment (P < 0.05). After 7 days of treatment, the levels of serum Hb, ALB, and PA in the two groups were significantly higher than those before treatment (P < 0.05), and the nutritional status in the observation group was significantly higher than that in the control group (P < 0.05). Conclusion Shenling Chengqi decoction can effectively improve gastrointestinal symptoms, nutritional status, and gastrointestinal dynamics in patients with sepsis. It has high safety and is worthy of clinical promotion.
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Singh SB, Coffman CN, Varga MG, Carroll-Portillo A, Braun CA, Lin HC. Intestinal Alkaline Phosphatase Prevents Sulfate Reducing Bacteria-Induced Increased Tight Junction Permeability by Inhibiting Snail Pathway. Front Cell Infect Microbiol 2022; 12:882498. [PMID: 35694541 PMCID: PMC9177943 DOI: 10.3389/fcimb.2022.882498] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 04/25/2022] [Indexed: 11/13/2022] Open
Abstract
Tight junctions (TJs) are essential components of intestinal barrier integrity and protect the epithelium against passive paracellular flux and microbial translocation. Dysfunctional TJ leads to leaky gut, a condition associated with diseases including inflammatory bowel disease (IBD). Sulfate-Reducing Bacteria (SRB) are minor residents of the gut. An increased number of Desulfovibrio, the most predominant SRB, is observed in IBD and other diseases associated with leaky gut. However, it is not known whether Desulfovibrio contributes to leaky gut. We tested the hypothesis that Desulfovibrio vulgaris (DSV) may induce intestinal permeability in vitro. Snail, a transcription factor, disrupts barrier function by affecting TJ proteins such as occludin. Intestinal alkaline phosphatase (IAP), a host defense protein, protects epithelial barrier integrity. We tested whether DSV induced permeability in polarized Caco-2 cells via snail and if this effect was inhibited by IAP. Barrier integrity was assessed by measuring transepithelial electric resistance (TEER) and by 4kDa FITC-Dextran flux to determine paracellular permeability. We found that DSV reduced TEER, increased FITC-flux, upregulated snail protein expression, caused nuclear translocation of snail, and disrupted occludin staining at the junctions. DSV-induced permeability effects were inhibited in cells knocked down for snail. Pre-treatment of cells with IAP inhibited DSV-induced FITC flux and snail expression and DSV-mediated disruption of occludin staining. These data show that DSV, a resident commensal bacterium, can contribute to leaky gut and that snail may serve as a novel therapeutic target to mitigate DSV-induced effects. Taken together, our study suggests a novel underlying mechanism of association of Desulfovibrio bloom with diseases with increased intestinal permeability. Our study also underscores IAP as a novel therapeutic intervention for correcting SRB-induced leaky gut via inhibition of snail.
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Affiliation(s)
- Sudha B. Singh
- Biomedical Research Institute of New Mexico, New Mexico Veterans Affairs (VA) Health Care System, Albuquerque, NM, United States
| | - Cristina N. Coffman
- Biomedical Research Institute of New Mexico, New Mexico Veterans Affairs (VA) Health Care System, Albuquerque, NM, United States
| | - Matthew G. Varga
- Biomedical Research Institute of New Mexico, New Mexico Veterans Affairs (VA) Health Care System, Albuquerque, NM, United States
| | - Amanda Carroll-Portillo
- Division of Gastroenterology and Hepatology, Department of Medicine, University of New Mexico, Albuquerque, NM, United States
| | - Cody A. Braun
- Biomedical Research Institute of New Mexico, New Mexico Veterans Affairs (VA) Health Care System, Albuquerque, NM, United States
| | - Henry C. Lin
- Division of Gastroenterology and Hepatology, Department of Medicine, University of New Mexico, Albuquerque, NM, United States
- Medicine Service, New Mexico Veterans Affairs (VA) Health Care System, Albuquerque, NM, United States
- *Correspondence: Henry C. Lin,
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Singh SB, Lin HC. Role of Intestinal Alkaline Phosphatase in Innate Immunity. Biomolecules 2021; 11:biom11121784. [PMID: 34944428 PMCID: PMC8698947 DOI: 10.3390/biom11121784] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 11/23/2021] [Accepted: 11/23/2021] [Indexed: 12/14/2022] Open
Abstract
Intestinal alkaline phosphatase (IAP) is a multi-functional protein that has been demonstrated to primarily protect the gut. The role of IAP in maintaining intestinal homeostasis is underscored by the observation that IAP expression is defective in many gastrointestinal-related disorders such as inflammatory bowel disease IBD, necrotizing enterocolitis, and metabolic syndrome and that exogenous IAP supplementation improves the outcomes associated with these disorders. Additionally, studies using transgenic IAP-knock out (IAP-KO) mouse models further support the importance of the defensive role of IAP in the intestine. Supplementation of exogenous IAP and cellular overexpression of IAP have also been used in vitro to dissect out the downstream mechanisms of this protein in mammalian cell lines. Some of the innate immune functions of IAP include lipopolysaccharide (LPS) detoxification, protection of gut barrier integrity, regulation of gut microbial communities and its anti-inflammatory roles. A novel function of IAP recently identified is the induction of autophagy. Due to its critical role in the gut physiology and its excellent safety profile, IAP has been used in phase 2a clinical trials for treating conditions such as sepsis-associated acute kidney injury. Many excellent reviews discuss the role of IAP in physiology and pathophysiology and here we extend these to include recent updates on this important host defense protein and discuss its role in innate immunity via its effects on bacteria as well as on host cells. We will also discuss the relationship between IAP and autophagy and how these two pathways may act in concert to protect the gut.
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Affiliation(s)
- Sudha B. Singh
- Biomedical Research Institute of New Mexico, Albuquerque, NM 87108, USA;
| | - Henry C. Lin
- Medicine Service, New Mexico VA Health Care System, Albuquerque, NM 87108, USA
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of New Mexico, Albuquerque, NM 87131, USA
- Correspondence:
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Kühn F, Duan R, Ilmer M, Wirth U, Adiliaghdam F, Schiergens TS, Andrassy J, Bazhin AV, Werner J. Targeting the Intestinal Barrier to Prevent Gut-Derived Inflammation and Disease: A Role for Intestinal Alkaline Phosphatase. Visc Med 2021; 37:383-393. [PMID: 34722721 DOI: 10.1159/000515910] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 03/16/2021] [Indexed: 02/02/2023] Open
Abstract
Background Intestinal alkaline phosphatase (IAP) as a tissue-specific isozyme of alkaline phosphatases is predominantly produced by enterocytes in the proximal small intestine. In recent years, an increasing number of pathologies have been identified to be associated with an IAP deficiency, making it very worthwhile to review the various roles, biological functions, and potential therapeutic aspects of IAP. Summary IAP primarily originates and acts in the intestinal tract but affects other organs through specific biological axes related to its fundamental roles such as promoting gut barrier function, dephosphorylation/detoxification of lipopolysaccharides (LPS), and regulation of gut microbiota. Key Messages Numerous studies reporting on the different roles and the potential therapeutic value of IAP across species have been published during the last decade. While IAP deficiency is linked to varying degrees of physiological dysfunctions across multiple organ systems, the supplementation of IAP has been proven to be beneficial in several translational and clinical studies. The increasing evidence of the salutary functions of IAP underlines the significance of the naturally occurring brush border enzyme.
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Affiliation(s)
- Florian Kühn
- Department of General, Visceral and Transplant Surgery, University Hospital of LMU Munich, Munich, Germany
| | - Ruifeng Duan
- Department of General, Visceral and Transplant Surgery, University Hospital of LMU Munich, Munich, Germany
| | - Matthias Ilmer
- Department of General, Visceral and Transplant Surgery, University Hospital of LMU Munich, Munich, Germany
| | - Ulrich Wirth
- Department of General, Visceral and Transplant Surgery, University Hospital of LMU Munich, Munich, Germany
| | - Fatemeh Adiliaghdam
- Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Tobias S Schiergens
- Department of General, Visceral and Transplant Surgery, University Hospital of LMU Munich, Munich, Germany
| | - Joachim Andrassy
- Department of General, Visceral and Transplant Surgery, University Hospital of LMU Munich, Munich, Germany
| | - Alexandr V Bazhin
- Department of General, Visceral and Transplant Surgery, University Hospital of LMU Munich, Munich, Germany
| | - Jens Werner
- Department of General, Visceral and Transplant Surgery, University Hospital of LMU Munich, Munich, Germany
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Jin Z, Chen K, Zhou Z, Peng W, Liu W. Roux-en-Y gastric bypass potentially improved intestinal permeability by regulating gut innate immunity in diet-induced obese mice. Sci Rep 2021; 11:14894. [PMID: 34290269 PMCID: PMC8295358 DOI: 10.1038/s41598-021-94094-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Accepted: 07/06/2021] [Indexed: 11/09/2022] Open
Abstract
Roux-en-Y gastric bypass (RYGB) has been demonstrated to be the most effective treatment for morbid obesity, yet the impact of RYGB on intestinal permeability is not fully known. In this work, we subjected obese mice to RYGB and sham operation procedures. Serum lipopolysaccharide (LPS) level, inflammatory cytokines and intestinal permeability were measured at 8 weeks post surgery. In contrast to sham surgery, RYGB reduced body weight, improved glucose tolerance and insulin resistance, and decreased serum levels of LPS, IL6 and TNFα. Intestinal permeability of the common limb and colon was significantly improved in the RYGB group compared to the sham group. The mRNA levels of IL1β, IL6, and TLR4 in the intestine were significantly decreased in the RYGB group compared with the sham group. The expression levels of intestinal islet-derived 3β (REG3β), islet-derived 3γ (REG3γ) and intestinal alkaline phosphatase (IAP) were higher in the RYGB group than in the sham group. In conclusion, in a diet-induced obesity (DIO) mouse model, both decreased intestinal permeability and attenuated systemic inflammation after RYGB surgery were associated with improved innate immunity, which might result from enhanced production of IAP and antimicrobial peptides.
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Affiliation(s)
- Zhangliu Jin
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China.,Department of Biliopancreatic and Metabolic Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China
| | - Kai Chen
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China.,Department of Biliopancreatic and Metabolic Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China
| | - Zhe Zhou
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China.,Department of Biliopancreatic and Metabolic Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China
| | - Weihui Peng
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China.,Department of Biliopancreatic and Metabolic Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China
| | - Wei Liu
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China. .,Department of Biliopancreatic and Metabolic Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China.
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Li B, Dou Z, Zhang L, Zhu L, Cao Y, Yu Q. Ghrelin Alleviates Intestinal Dysfunction in Sepsis Through the KLF4/MMP2 Regulatory Axis by Activating SIRT1. Front Immunol 2021; 12:646775. [PMID: 33968038 PMCID: PMC8102724 DOI: 10.3389/fimmu.2021.646775] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 03/23/2021] [Indexed: 12/14/2022] Open
Abstract
Intestinal barrier dysfunction is an important contributor to morbidity caused by sepsis. This study investigates the molecular mechanism by which Ghrelin affects intestinal dysfunction in rat model of sepsis. A rat model of sepsis was established by cecal ligation and puncture (CLP), revealing that Ghrelin was downregulated when sepsis occurs. Increases in the levels of inflammatory factors tumor necrosis factor α (TNF-α), interleukin-1 (IL-1β), IL-6, gastrin, γ-H2AX and 8-OHdG was also detected in this model system, as was an overall increase in oxidative stress. Introduction of exogenous Ghrelin inhibited these increases in inflammatory response and oxidative stress, leading to a reduction of overall sepsis-induced intestinal dysfunction. Ghrelin was then shown to activate SIRT1 expression in vitro, while SIRT1 was found to co-express with KLF4, which in turn was predicted to bind to matrix metalloproteinase 2 (MMP2) promoter. Finally, gain- and loss-of-function experiment demonstrated that SIRT1 upregulated the expression of KLF4 to downregulate MMP2. Collectively, Ghrelin inhibits the oxidative stress and intestinal dysfunction to attenuate sepsis by activating SIRT1 and regulating a KLF4/MMP2 regulatory axis.
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Affiliation(s)
- Bin Li
- Department of Critical Medicine, The First Hospital of Lanzhou University, Lanzhou, China
| | - Zhimin Dou
- Department of Critical Medicine, The First Hospital of Lanzhou University, Lanzhou, China
| | - Lei Zhang
- Department of Critical Medicine, The First Hospital of Lanzhou University, Lanzhou, China
| | - Lei Zhu
- Department of Critical Medicine, The First Hospital of Lanzhou University, Lanzhou, China
| | - Yongqiang Cao
- Department of Critical Medicine, The First Hospital of Lanzhou University, Lanzhou, China
| | - Qin Yu
- Department of Respiratory, The First Hospital of Lanzhou University (The First School of Clinical Medicine), Lanzhou, China
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Dietary alternatives to in-feed antibiotics, gut barrier function and inflammation in piglets post-weaning: Where are we now? Anim Feed Sci Technol 2021. [DOI: 10.1016/j.anifeedsci.2021.114836] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Intestinal alkaline phosphatase modulation by food components: predictive, preventive, and personalized strategies for novel treatment options in chronic kidney disease. EPMA J 2020; 11:565-579. [PMID: 33240450 DOI: 10.1007/s13167-020-00228-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 10/30/2020] [Indexed: 12/18/2022]
Abstract
Alkaline phosphatase (AP) is a ubiquitous membrane-bound glycoprotein that catalyzes phosphate monoesters' hydrolysis from organic compounds, an essential process in cell signaling. Four AP isozymes have been described in humans, placental AP, germ cell AP, tissue nonspecific AP, and intestinal AP (IAP). IAP plays a crucial role in gut microbial homeostasis, nutrient uptake, and local and systemic inflammation, and its dysfunction is associated with persistent inflammatory disorders. AP is a strong predictor of mortality in the general population and patients with cardiovascular and chronic kidney disease (CKD). However, little is known about IAP modulation and its possible consequences in CKD, a disease characterized by gut microbiota imbalance and persistent low-grade inflammation. Mitigating inflammation and dysbiosis can prevent cardiovascular complications in patients with CKD, and monitoring factors such as IAP can be useful for predicting those complications. Here, we review IAP's role and the results of nutritional interventions targeting IAP in experimental models to prevent alterations in the gut microbiota, which could be a possible target of predictive, preventive, personalized medicine (PPPM) to avoid CKD complications. Microbiota and some nutrients may activate IAP, which seems to have a beneficial impact on health; however, data on CKD remains scarce.
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