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Liu Y, Ji T, Jiang H, Chen M, Liu W, Zhang Z, He X. Emodin alleviates intestinal ischemia-reperfusion injury through antioxidant stress, anti-inflammatory responses and anti-apoptosis effects via Akt-mediated HO-1 upregulation. J Inflamm (Lond) 2024; 21:25. [PMID: 38982499 PMCID: PMC11232135 DOI: 10.1186/s12950-024-00392-z] [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: 11/16/2023] [Accepted: 05/08/2024] [Indexed: 07/11/2024] Open
Abstract
BACKGROUND Intestinal ischemia-reperfusion (I/R) injury is a severe vascular emergency. Previous research indicated the protective effects of Emodin on I/R injury. Our study aims to explore the effect of Emodin on intestinal I/R (II/R) injury and elucidate the underlying mechanisms. METHODS C57BL/6 mice and Caco-2 cells were used for in vivo and in vitro studies. We established an animal model of II/R injury by temporarily occluding superior mesenteric artery. We constructed an oxygen-glucose deprivation/reoxygenation (OGD/R) cell model using a hypoxia-reoxygenation incubator. Different doses of Emodin were explored to determine the optimal therapeutic dose. Additionally, inhibitors targeting the protein kinase B (Akt) or Heme oxygenase-1 (HO-1) were administered to investigate their potential protective mechanisms. RESULTS Our results demonstrated that in animal experiments, Emodin mitigated barrier disruption, minimized inflammation, reduced oxidative stress, and inhibited apoptosis. When Akt or HO-1 was inhibited, the protective effect of Emodin was eliminated. Inhibiting Akt also reduced the level of HO-1. In cell experiments, Emodin reduced inflammation and apoptosis in the OGD/R cell model. Additionally, when Akt or HO-1 was inhibited, the protective effect of Emodin was weakened. CONCLUSIONS Our findings suggest that Emodin may protect the intestine against II/R injury through the Akt/HO-1 signaling pathway.
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Affiliation(s)
- Yinyin Liu
- Department of Anesthesiology, Zhongnan Hospital of Wuhan University, East Lake Road, Wuhan, Hubei, 430071, China
| | - Tuo Ji
- Department of Anesthesiology, School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei, 430079, China
| | - Haixing Jiang
- Department of Anesthesiology, Zhongnan Hospital of Wuhan University, East Lake Road, Wuhan, Hubei, 430071, China
| | - Meng Chen
- Department of Anesthesiology, Zhongnan Hospital of Wuhan University, East Lake Road, Wuhan, Hubei, 430071, China
- Department of Anesthesiology, Hubei Maternal and Child Health Hospital, Wuhan, Hubei, 430070, China
| | - Wanli Liu
- Department of Anesthesiology, Zhongnan Hospital of Wuhan University, East Lake Road, Wuhan, Hubei, 430071, China
| | - Zongze Zhang
- Department of Anesthesiology, Zhongnan Hospital of Wuhan University, East Lake Road, Wuhan, Hubei, 430071, China.
| | - Xianghu He
- Department of Anesthesiology, Zhongnan Hospital of Wuhan University, East Lake Road, Wuhan, Hubei, 430071, China.
- Department of Anesthesiology, Jiayu Hospital, Zhongnan Hospital of Wuhan University, Xianning, Hubei, 437200, China.
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Xun W, Ji M, Ma Z, Deng T, Yang W, Hou G, Shi L, Cao T. Dietary emodin alleviates lipopolysaccharide-induced intestinal mucosal barrier injury by regulating gut microbiota in piglets. ANIMAL NUTRITION (ZHONGGUO XU MU SHOU YI XUE HUI) 2023; 14:152-162. [PMID: 37455790 PMCID: PMC10344667 DOI: 10.1016/j.aninu.2023.05.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 04/06/2023] [Accepted: 05/10/2023] [Indexed: 07/18/2023]
Abstract
This study was to determine the effects of dietary emodin (ED) on the intestinal mucosal barrier, nuclear factor kappa-B (NF-κB) pathways, and gut microbial flora in lipopolysaccharide (LPS)-induced piglets. Twenty-four weaned piglets were chosen and 4 treatments were created by randomly distributing piglets into CON, ED, LPS, and ED_LPS groups. Experiments were done in a 2 × 2 factorial arrangement and maintained for 21 d. Dietary treatment (a basal diet or 300 mg/kg ED) and immunological challenge (LPS or sterile saline) were 2 major factors. Intraperitoneal injections of LPS or sterilized saline were given to piglets on d 21. Six hours after the LPS challenge, all piglets were euthanized for sample collection and analysis. The results showed that piglets of the ED_LPS group had higher (P < 0.05) villus height to crypt depth ratio (VCR), and lower (P < 0.05) plasma D-lactate and diamine oxidase (DAO) than the LPS group. Furthermore, ED inhibited (P < 0.05) the decrease of glutathione peroxidase (GSH-Px) and catalase (CAT) activities and increase of malonaldehyde level (P < 0.05) in jejunal mucosa induced by LPS. The mRNA levels of pro-inflammatory cytokine genes (IL-6, IL-1β, and TNF-α) were significantly reduced (P < 0.05), and the mRNA levels of antioxidant enzyme genes (GPX-1, SOD2 and CAT), as well as protein and mRNA levels of tight junction proteins (occludin, claudin-1, and ZO-1), were also significantly increased (P < 0.05) by ED addition in LPS-induced piglets. Meanwhile, ED supplementation significantly decreased the LPS-induced protein levels of cyclooxygenase-2 and phosphorylation levels of NF-κB p65 and IκBα in jejunal mucosa. Emodin had a significant effect on the composition of gut microbial flora at various taxonomic positions as indicated by 16S RNA sequencing. The acetic acid, isobutyric acid, valeric acid, and isovaleric acid concentrations in the cecum were also increased by ED addition in pigs (P < 0.05). Furthermore, the correlation analysis revealed that some intestinal microbiota had a potential relationship with jejunal VCR, plasma D-lactate and DAO, jejunal mucosa GSH-Px and CAT activity, and cecal short-chain fatty acid concentration. These data suggest that ED is effective in alleviating LPS-induced intestinal mucosal barrier injury by modulating gut microbiota in piglets.
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Affiliation(s)
- Wenjuan Xun
- College of Animal Science and Technology, Hainan University, Haikou, 570228, China
| | - Mengyao Ji
- College of Animal Science and Technology, Hainan University, Haikou, 570228, China
| | - Zhonghua Ma
- College of Animal Science and Technology, Hainan University, Haikou, 570228, China
| | - Tanjie Deng
- College of Animal Science and Technology, Hainan University, Haikou, 570228, China
| | - Wen Yang
- College of Animal Science and Technology, Hainan University, Haikou, 570228, China
| | - Guanyu Hou
- Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, 571100, China
| | - Liguang Shi
- Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, 571100, China
| | - Ting Cao
- Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, 571100, China
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Liao R, Zhao P, Wu J, Fang K. Salidroside protects against intestinal barrier dysfunction in septic mice by regulating IL‑17 to block the NF‑κB and p38 MAPK signaling pathways. Exp Ther Med 2023; 25:89. [PMID: 36684648 PMCID: PMC9849854 DOI: 10.3892/etm.2023.11788] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 09/29/2022] [Indexed: 01/06/2023] Open
Abstract
Sepsis is a systemic inflammatory response syndrome, mainly caused by infection or suspected infectious factors. The intestine is not only one of the most easily involved organs in the course of sepsis, but also the dynamic organ for the course of sepsis. The present study investigated the protective effect and mechanism of salidroside on intestinal barrier dysfunction of septic mice. Briefly, C57BL/6 mice were used to establish a septic model and then administered with salidroside. The ileum tissues of mice were examined by histopathological examination. Fluorescein isothiocyanate-dextran concentration was measured. IL-17, IL-6, IL-13 and TNF-α levels in ileum tissues and NF-κB and p38 MAPK activations were detected by ELISA and the expressions of NF-κB p65 and p38 MAPK protein with their phosphorylation and intestinal tight junction proteins were gauged by western blotting. The above assays were performed again to investigate the effect of anti-IL-17A and salidroside (160 mg/kg) alone or in combination. The septic model induced the ileum tissue injury, increased intestinal permeability and TNF-α, IL-17 and IL-6 levels, activated NF-κB and p38 MAPK pathways, promoted the expressions of NF-κB p65 and p38 MAPK and their phosphorylation, while suppressing the levels of IL-13 and intestinal tight junction proteins. Salidroside and anti-IL-17A partially reversed the above effects of septic model, which in combination further strengthened the reversing effect. Collectively, salidroside protected against intestinal barrier dysfunction in septic mice by downregulating IL-17 level to inhibit NF-κB and p38 MAPK signaling pathways, thus providing a new treatment direction.
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Affiliation(s)
- Rongxin Liao
- Center of Traditional Chinese Medicine Preventive Treatment, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, Guangzhou, Guangdong 510310, P.R. China,Correspondence to: Dr Rongxin Liao, Center of Traditional Chinese Medicine Preventive Treatment, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, 13 Shiliugang Road, Haizhu, Guangzhou, Guangdong 510310, P.R. China
| | - Peng Zhao
- Center of Traditional Chinese Medicine Preventive Treatment, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, Guangzhou, Guangdong 510310, P.R. China
| | - Jianming Wu
- Center of Traditional Chinese Medicine Preventive Treatment, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, Guangzhou, Guangdong 510310, P.R. China
| | - Keren Fang
- Center of Traditional Chinese Medicine Preventive Treatment, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, Guangzhou, Guangdong 510310, P.R. China
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Butyrate ameliorates maternal high-fat diet-induced fetal liver cellular apoptosis. PLoS One 2022; 17:e0270657. [PMID: 35793323 PMCID: PMC9258878 DOI: 10.1371/journal.pone.0270657] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 06/14/2022] [Indexed: 12/22/2022] Open
Abstract
A maternal high-fat diet (HFD) can impact the offspring’s development of liver steatosis, with fetal development in utero being a crucial period. Therefore, this study investigated the mechanism and whether butyrate can rescue liver injury caused by maternal HFD in the fetus. Pregnant female Sprague Dawley rats were randomly divided into two groups, prenatal HFD (58% fat) exposure or normal control diet (4.5% fat). The HFD group was fed an HFD 7 weeks before mating and during gestation until sacrifice at gestation 21 days. After confirmation of mating, the other HFD group was supplemented with sodium butyrate (HFSB). The results showed that maternal liver histology showed lipid accumulation with steatosis and shortened ileum villi in HFD, which was ameliorated in the HFSB group (P<0.05). There was increased fetal liver and ileum TUNEL staining and IL-6 expression with increased fetal liver TNF-α and malondialdehyde expression in the HFD group (P<0.05), which decreased in the HFSB group (P<0.05). The fetal liver expression of phospho-AKT/AKT and GPX1 decreased in the HFD group but increased in the HFSB group (P<0.05). In conclusion that oxidative stress with inflammation and apoptosis plays a vital role after maternal HFD in the fetus liver that can be ameliorated with butyrate supplementation.
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STANCIOIU F, IVANESCU B, DUMITRESCU R. Perspectives on the Immune System in Sepsis. MAEDICA 2022; 17:404-414. [PMID: 36032596 PMCID: PMC9375866 DOI: 10.26574/maedica.2022.17.2.395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Beyond the modifications shown by the biochemistry labs, profound and ample modifications are seen in septic patients at a molecular level stemming from DNA translation and gene expression, manifested as unique profiles of mRNA (messenger), as well as non-coding, functional RNAs: miRNA (micro) and lncRNAs (long non-coding). Counteracting these modifications requires treatment with pleiotropic molecules and/or combination of molecules and opens the possibility of future treatments with arrays of siRNAs and/or specific panels of small molecules tailored for each patient subpopulation.
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Affiliation(s)
| | | | - Radu DUMITRESCU
- University of Bucharest, Medicover Hospital, Bucharest, Romania
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Gao LL, Wang ZH, Mu YH, Liu ZL, Pang L. Emodin Promotes Autophagy and Prevents Apoptosis in Sepsis-Associated Encephalopathy through Activating BDNF/TrkB Signaling. Pathobiology 2021; 89:135-145. [PMID: 34872094 DOI: 10.1159/000520281] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 08/22/2021] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE Sepsis-associated encephalopathy (SAE) is a severe and common complication of sepsis and can induce cognitive dysfunction and apoptosis of neurons and neuroinflammation. Emodin has been confirmed to have anti-inflammatory effects. Thus, we sought to investigate the role of Emodin in SAE. METHODS The cecal ligation and puncture (CLP) method was used for the establishment of SAE in mice model. For treatment of Emodin, intraperitoneal injection of 20 mg/kg Emodin was performed before the surgery. The Morris water maze and open field tests were carried for measurement of cognitive dysfunction. Hematoxylin and eosin staining was for histological analysis of hippocampus. Cell apoptosis of hippocampus neurons was measured by TUNEL staining. Pro-inflammatory and anti-inflammatory cytokines in hippocampus tissue homogenate were evaluated by ELISA. BDNF/TrkB signaling-related proteins (TrkB, p-TrkB, and BDNF), autophagy-related proteins (LC3 II/I and Beclin-1), and apoptosis-related proteins (Bax, Bcl-2, and cleaved caspase-3) were detected by Western blotting. RESULTS Emodin significantly inhibited apoptosis and induced autophagy in hippocampal neurons of CLP-treated mice. In addition, Emodin significantly ameliorated CLP-induced cognitive dysfunction and pathological injury in mice. Meanwhile, Emodin notably inhibited CLP-induced inflammatory responses in mice via upregulation of BDNF/TrkB signaling, while the effect of Emodin was partially reversed in the presence of K252a (BDNF/TrkB signaling inhibitor). CONCLUSION Emodin significantly inhibited the progression of SAE via mediation of BDNF/TrkB signaling. Thus, Emodin might serve as a new agent for SAE treatment.
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Affiliation(s)
- Li-Li Gao
- Department of Emergency ICU, The First Hospital of Jilin University, Changchun, China
| | - Zhi-Hao Wang
- Department of Geriatrics, The First Hospital of Jilin University, Changchun, China
| | - Yu-Hang Mu
- Department of Emergency ICU, The First Hospital of Jilin University, Changchun, China
| | - Zuo-Long Liu
- Department of Emergency ICU, The First Hospital of Jilin University, Changchun, China
| | - Li Pang
- Department of Emergency ICU, The First Hospital of Jilin University, Changchun, China
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Emodin Improves Intestinal Health and Immunity through Modulation of Gut Microbiota in Mice Infected by Pathogenic Escherichia coli O 1. Animals (Basel) 2021; 11:ani11113314. [PMID: 34828045 PMCID: PMC8614316 DOI: 10.3390/ani11113314] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 11/12/2021] [Accepted: 11/15/2021] [Indexed: 02/07/2023] Open
Abstract
The effect of emodin on the intestinal mucosal barrier of a mouse E. coli O1-induced diarrhea model was observed. Following successful establishment of a diarrhea model, the mice were treated with drugs for seven days. Intestinal lesions and the shape and the number of goblet cells were assessed via hematoxylin-eosin and periodic-acid-Schiff staining, while changes in inflammatory factors, ultrastructure of the small intestine, expression of MUC-2, and changes in the intestinal microbiota were analyzed via RT-PCR, electron microscopy, immunofluorescence, and 16S rRNA sequencing. Examination showed that emodin ameliorated pathological damage to the intestines of diarrheic mice. RT-PCR indicated that emodin reduced TNF-α, IL-β, IL-6, MPO, and COX-2 mRNA levels in duodenal tissues and increased the levels of sIgA and MUC-2 and the number of goblet cells. Microbiome analysis revealed that Escherichia coli O1 reduced bacterial richness and altered the distribution pattern of bacterial communities at the phylum and order levels in cecum contents. Notably, pathogenic Clostridiales and Enterobacteriales were significantly increased in diarrheic mice. However, emodin reversed the trend. Thus, emodin protected against intestinal damage induced by E. coli O1 and improved intestinal mucosal barrier function in mice by increasing the abundance of beneficial intestinal microbiota and inhibiting the abundance of harmful bacteria, thereby alleviating diarrhea.
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The Health Benefits of Emodin, a Natural Anthraquinone Derived from Rhubarb-A Summary Update. Int J Mol Sci 2021; 22:ijms22179522. [PMID: 34502424 PMCID: PMC8431459 DOI: 10.3390/ijms22179522] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 08/27/2021] [Accepted: 08/30/2021] [Indexed: 02/07/2023] Open
Abstract
Emodin (6-methyl-1,3,8-trihydroxyanthraquinone) is a naturally occurring anthraquinone derivative found in roots and leaves of various plants, fungi and lichens. For a long time it has been used in traditional Chinese medicine as an active ingredient in herbs. Among other sources, it is isolated from the rhubarb Rheum palmatum or tuber fleece-flower Polygonam multiflorum. Emodin has a wide range of biological activities, including diuretic, antibacterial, antiulcer, anti-inflammatory, anticancer and antinociceptive. According to the most recent studies, emodin acts as an antimalarial and antiallergic agent, and can also reverse resistance to chemotherapy. In the present work the potential therapeutic role of emodin in treatment of inflammatory diseases, cancers and microbial infections is analysed.
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Li P, Hu S, Qian C, Yao Y, Li LY, Yang JF, Yang L, Yang CC, Zhou H, Wang SX, Hu Y, Zhu XY, Zhou J, Pan LX, Shen CP, Zhou H. The Therapeutic Effect of Traditional Chinese Medicine on Inflammatory Diseases Caused by Virus, Especially on Those Caused by COVID-19. Front Pharmacol 2021; 12:650425. [PMID: 34122073 PMCID: PMC8187915 DOI: 10.3389/fphar.2021.650425] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 03/29/2021] [Indexed: 12/19/2022] Open
Abstract
Inflammasomes are large multimolecular complexes best recognized because of their ability to control activation of caspase-1, which in turn regulates the maturation of interleukin-18 (IL-18) and interleukin-1 β (IL-1β). IL-1β was originally identified as a pro-inflammatory cytokine, capable of inducing local and systemic inflammation as well as a fever response reaction in response to infection or injury. Excessive production of IL-1β is related to inflammatory and autoimmune diseases. Both coronavirus disease 2019 (COVID-19) and severe acute respiratory syndrome (SARS) are characterized by excessive inflammatory response. For SARS, there is no correlation between viral load and worsening symptoms. However, there is no specific medicine which is available to treat the disease. As an important part of medical practice, TCM showed an obvious therapeutic effect in SARS-CoV-infected patients. In this article, we summarize the current applications of TCM in the treatment of COVID-19 patients. Herein, we also offer an insight into the underlying mechanisms of the therapeutic effects of TCM, as well as introduce new naturally occurring compounds with anti-coronavirus activity, in order to provide a new and potential drug development strategy for the treatment of COVID-19.
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Affiliation(s)
- Peng Li
- The First Affiliated Hospital of Medical University of Anhui, Hefei, China
| | - Shuang Hu
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei, China.,Institute for Liver Diseases of Anhui Medical University, Anhui Medical University, Hefei, China
| | - Cheng Qian
- Center for Scientific Research, Anhui Medical University, Hefei, China
| | - Yan Yao
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei, China.,Institute for Liver Diseases of Anhui Medical University, Anhui Medical University, Hefei, China
| | - Liang-Yun Li
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei, China.,Institute for Liver Diseases of Anhui Medical University, Anhui Medical University, Hefei, China
| | - Jun-Fa Yang
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei, China.,Institute for Liver Diseases of Anhui Medical University, Anhui Medical University, Hefei, China
| | - Li Yang
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei, China.,Institute for Liver Diseases of Anhui Medical University, Anhui Medical University, Hefei, China
| | - Chen-Chen Yang
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei, China.,Institute for Liver Diseases of Anhui Medical University, Anhui Medical University, Hefei, China
| | - Hong Zhou
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei, China.,Institute for Liver Diseases of Anhui Medical University, Anhui Medical University, Hefei, China
| | - Shu-Xian Wang
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei, China.,Institute for Liver Diseases of Anhui Medical University, Anhui Medical University, Hefei, China
| | - Ying Hu
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei, China.,Institute for Liver Diseases of Anhui Medical University, Anhui Medical University, Hefei, China
| | - Xing-Yu Zhu
- National Drug Clinical Trial Institution, The First Affiliated Hospital of Bengbu Medical College, Hefei, China
| | - Jing Zhou
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei, China.,Institute for Liver Diseases of Anhui Medical University, Anhui Medical University, Hefei, China
| | - Lin-Xin Pan
- School of Life Sciences, Anhui Medical University, Hefei, China
| | - Chuan-Pu Shen
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei, China.,Institute for Liver Diseases of Anhui Medical University, Anhui Medical University, Hefei, China
| | - Huan Zhou
- National Drug Clinical Trial Institution, The First Affiliated Hospital of Bengbu Medical College, Hefei, China
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HO-1/CO Maintains Intestinal Barrier Integrity through NF- κB/MLCK Pathway in Intestinal HO-1 -/- Mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:6620873. [PMID: 34104309 PMCID: PMC8159651 DOI: 10.1155/2021/6620873] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Revised: 04/02/2021] [Accepted: 04/19/2021] [Indexed: 12/12/2022]
Abstract
Background Intestinal barrier injury is an important contributor to many diseases. We previously found that heme oxygenase-1 (HO-1) and carbon monoxide (CO) protect the intestinal barrier. This study is aimed at elucidating the molecular mechanisms of HO-1/CO in barrier loss. Materials and Methods We induced gut leakiness by injecting carbon tetrachloride (CCl4) to wildtype or intestinal HO-1-deficient mice. In addition, we administrated tumor necrosis factor-α (TNF-α) to cells with gain- or loss-of-HO-1 function. The effects of HO-1/CO maintaining intestinal barrier integrity were investigated in vivo and in vitro. Results Cobalt protoporphyrin and CO-releasing molecule-2 alleviated colonic mucosal injury and TNF-α levels; upregulated tight junction (TJ) expression; and inhibited epithelial IκB-α degradation and phosphorylation, NF-κB p65 phosphorylation, long MLCK expression, and MLC-2 phosphorylation after administration of CCl4. Zinc protoporphyrin completely reversed these effects. These findings were further confirmed in vitro, using Caco-2 cells with gain- or loss-of-HO-1-function after TNF-α. Pretreated with JSH-23 (NF-κB inhibitor) or ML-7 (long MLCK inhibitor), HO-1 overexpression prevented TNF-α-induced TJ disruption, while HO-1 shRNA promoted TJ damage even in the presence of JSH-23 or ML-7, thus suggesting that HO-1 dependently protected intestinal barrier via the NF-κB p65/MLCK/p-MLC-2 pathway. Intestinal HO-1-deficient mice further demonstrated the effects of HO-1 in maintaining intestinal barrier integrity and its relative mechanisms. Alleviated hepatic fibrogenesis and serum ALT levels finally confirmed the clinical significance of HO-1/CO repairing barrier loss in liver injury. Conclusion HO-1/CO maintains intestinal barrier integrity through the NF-κB/MLCK pathway. Therefore, the intestinal HO-1/CO-NF-κB/MLCK system is a potential therapeutic target for diseases with a leaky gut.
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