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Hu J, Chen J, Xu X, Hou Q, Ren J, Yan X. Gut microbiota-derived 3-phenylpropionic acid promotes intestinal epithelial barrier function via AhR signaling. MICROBIOME 2023; 11:102. [PMID: 37158970 PMCID: PMC10165798 DOI: 10.1186/s40168-023-01551-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 04/17/2023] [Indexed: 05/10/2023]
Abstract
BACKGROUND The intestinal epithelial barrier confers protection against the intestinal invasion by pathogens and exposure to food antigens and toxins. Growing studies have linked the gut microbiota to the intestinal epithelial barrier function. The mining of the gut microbes that facilitate the function of intestinal epithelial barrier is urgently needed. RESULTS Here, we studied a landscape of the gut microbiome of seven pig breeds using metagenomics and 16S rDNA gene amplicon sequencing. The results indicated an obvious difference in the gut microbiome between Congjiang miniature (CM) pigs (a native Chinese breed) and commercial Duroc × [Landrace × Yorkshire] (DLY) pigs. CM finishing pigs had stronger intestinal epithelial barrier function than the DLY finishing pigs. Fecal microbiota transplantation from CM and DLY finishing pigs to germ-free (GF) mice transferred the intestinal epithelial barrier characteristics. By comparing the gut microbiome of the recipient GF mice, we identified and validated Bacteroides fragilis as a microbial species that contributes to the intestinal epithelial barrier. B. fragilis-derived 3-phenylpropionic acid metabolite had an important function on the enhancement of intestinal epithelial barrier. Furthermore, 3-phenylpropionic acid facilitated the intestinal epithelial barrier by activating aryl hydrocarbon receptor (AhR) signaling. CONCLUSIONS These findings suggest that manipulation of B. fragilis and 3-phenylpropionic acid is a promising strategy for improving intestinal epithelial barrier. Video Abstract.
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Affiliation(s)
- Jun Hu
- State Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Frontiers Science Center for Animal Breeding and Sustainable Production, College of Animal Sciences and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
- The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, 430070, China
- Hubei Provincial Engineering Laboratory for Pig Precision Feeding and Feed Safety Technology, Wuhan, Hubei, 430070, China
| | - Jianwei Chen
- BGI Research-Qingdao, BGI, Qingdao, 266555, China
| | - Xiaojian Xu
- State Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Frontiers Science Center for Animal Breeding and Sustainable Production, College of Animal Sciences and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
- The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, 430070, China
- Hubei Provincial Engineering Laboratory for Pig Precision Feeding and Feed Safety Technology, Wuhan, Hubei, 430070, China
| | - Qiliang Hou
- State Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Frontiers Science Center for Animal Breeding and Sustainable Production, College of Animal Sciences and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
- The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, 430070, China
- Hubei Provincial Engineering Laboratory for Pig Precision Feeding and Feed Safety Technology, Wuhan, Hubei, 430070, China
| | - Jing Ren
- State Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Frontiers Science Center for Animal Breeding and Sustainable Production, College of Animal Sciences and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
- The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, 430070, China
- Hubei Provincial Engineering Laboratory for Pig Precision Feeding and Feed Safety Technology, Wuhan, Hubei, 430070, China
| | - Xianghua Yan
- State Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Frontiers Science Center for Animal Breeding and Sustainable Production, College of Animal Sciences and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
- The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, Hubei, 430070, China.
- Hubei Provincial Engineering Laboratory for Pig Precision Feeding and Feed Safety Technology, Wuhan, Hubei, 430070, China.
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Miao Y, Wang B, Hu J, Zhang H, Li X, Huang Y, Zhuang P, Zhang Y. Herb Formula (GCis) Prevents Pulmonary Infection Secondary to Intracerebral Hemorrhage by Enhancing Peripheral Immunity and Intestinal Mucosal Immune Barrier. Front Pharmacol 2022; 13:888684. [PMID: 35677425 PMCID: PMC9168277 DOI: 10.3389/fphar.2022.888684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 04/04/2022] [Indexed: 11/13/2022] Open
Abstract
Lung infection is a common complication induced by stroke and seriously affects the prognosis and life quality of patients. However, effective therapeutic strategies are still lacking. In the present study, the herb formula GCis was confirmed to prevent pulmonary infection induced by intracerebral hemorrhage (ICH). The animal model of lung infection induced by ICH, GCis (Ginseng Radix et Rhizoma, Aconiti Lateralis Radix Praeparata, and Cistanches Herba) was orally administrated every day for 7 days. Lung microbial biomass and pathological results showed that the GCis formula pretreatment significantly reduced lung bacterial biomass and alleviated pathological abnormalities. These results indicated that the GCis formula has a clear pharmacological effect on preventing lung infection induced by ICH. Immunosuppression induced by ICH seemed to be the main mechanism of lung infection. Our results showed that the spleen and thymus indexes, WBC, and LY% contents were significantly increased in the GCis formula group. Moreover, bone marrow cells were further analyzed by transcriptome sequencing, and GO and KEGG enrichment analysis results showed that immune function was the main pathway enriched by differential genes after GCis formula intervention. More importantly, our results showed that GCis pretreatment had no significant effect on the mRNA expression of IL-1β, IL-6, and TNF-α in the brain. These results indicated that the GCis formula could enhance immunity after ICH. The intestinal barrier function was further investigated in the present study, considering the origin of the source of infection. Our results showed that the mRNA expressions of intestinal ZO-1, SIgA, and MUC2 were significantly increased, villi structure was intact, inflammatory cell infiltration was reduced, and goblet cell number was increased after GCis formula treatment. These results suggest that the GCis formula can enhance the intestinal mucosal immune barrier. This study provides a herb formula (GCis) that could enhance peripheral immunity and intestinal mucosal immune barrier to prevent pulmonary infection induced by ICH. It would be beneficial in the prevention of severe clinical infections.
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Affiliation(s)
- Yulu Miao
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Bin Wang
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Jing Hu
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Hanyu Zhang
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Xiaojin Li
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Yingying Huang
- College of Pharmacy, Anhui University of Chinese Medicine and Anhui Academy of Chinese Medicine, Hefei, China
- *Correspondence: Yingying Huang, ; Pengwei Zhuang, ; Yanjun Zhang,
| | - Pengwei Zhuang
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, China
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
- *Correspondence: Yingying Huang, ; Pengwei Zhuang, ; Yanjun Zhang,
| | - Yanjun Zhang
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
- *Correspondence: Yingying Huang, ; Pengwei Zhuang, ; Yanjun Zhang,
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3
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Yong Y, Li J, Gong D, Yu T, Wu L, Hu C, Liu X, Yu Z, Ma X, Gooneratne R, El-Aty AMA, Chen J, Ju X. ERK1/2 mitogen-activated protein kinase mediates downregulation of intestinal tight junction proteins in heat stress-induced IBD model in pig. J Therm Biol 2021; 101:103103. [PMID: 34879918 DOI: 10.1016/j.jtherbio.2021.103103] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 08/25/2021] [Accepted: 09/15/2021] [Indexed: 01/13/2023]
Abstract
In many mammalian species, including pigs, heat stress (HS) detrimentally leads to epithelium damage and increases intestinal permeability. However, the underlying molecular mechanisms are not thoroughly investigated yet. This study aimed to examine the RIP1/RIP3-ERK1/2 signaling pathway that regulates the expression of tight junction proteins in HS-treated pigs. In in vitro cultured intestinal porcine epithelial cells (IPEC-J2), HS induced the expression of tight junction proteins, ZO-1, claudin-1, and claudin-4, that are regulated by the ERK1/2-MAPK signaling pathway. Further, high expression of HSP70 in IPEC-J2 cells induced a significant decrease in receptor-interacting protein 1/3 (RIP1/3), phosphorylated ERK, and tight junction protein claudin-1 (P < 0.05). Necrostatin-1 (A selective inhibitor of RIPK1) suppressed the upregulation of phosphorylated ERK1/2 induced by HS, indicating that the RIP1/RIP3 regulates ERK1/2 phosphorylation in IPEC-J2 under heat stress. In addition, HS significantly damaged the intestinal morphology characterized by reduction of villus length and crypt depth in in vivo porcine model. Moreover, the expression of tight junction, ZO-1, and claudin-4 were downregulated, whereas phosphorylated p38 and ERK1/2 were upregulated in the duodenum of heat-stressed pigs. Interestingly, a decrease in ZO-1 and claudin-1 was observed in the colon, where phosphorylated ERK1/2 was similar to that in the duodenum. Our results demonstrate that RIP1/RIP3-ERK1/2 signaling pathway regulates the expression of tight junction proteins in HS-pigs. This finding further advances the intestinal barrier function's underlying mechanisms associated with signaling regulation.
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Affiliation(s)
- Yanhong Yong
- Shenzhen Institute of Guangdong Ocean University, Shenzhen, 518018, China; Department of Veterinary Medicine, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Junyu Li
- Shenzhen Institute of Guangdong Ocean University, Shenzhen, 518018, China; Department of Veterinary Medicine, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Dongliang Gong
- Department of Veterinary Medicine, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Tianyue Yu
- Department of Veterinary Medicine, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Lianyun Wu
- Department of Veterinary Medicine, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Canying Hu
- Department of Veterinary Medicine, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Xiaoxi Liu
- Department of Veterinary Medicine, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Zhichao Yu
- Department of Veterinary Medicine, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Xingbin Ma
- Department of Veterinary Medicine, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Ravi Gooneratne
- Faculty of Agriculture and Life Sciences, Lincoln University, Lincoln, 7647, New Zealand
| | - A M Abd El-Aty
- State Key Laboratory of Biobased Material and Green Papermaking, College of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Science, Jinan, 250353, China; Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt; Department of Medical Pharmacology, Faculty of Medicine, Atatürk University, Erzurum, Turkey
| | - Jinjun Chen
- Department of Veterinary Medicine, Guangdong Ocean University, Zhanjiang, 524088, China.
| | - Xianghong Ju
- Shenzhen Institute of Guangdong Ocean University, Shenzhen, 518018, China; Department of Veterinary Medicine, Guangdong Ocean University, Zhanjiang, 524088, China.
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Fung AA, Zhou A, Vanos JK, Schmid-Schönbein GW. Enhanced intestinal permeability and intestinal co-morbidities in heat strain: A review and case for autodigestion. Temperature (Austin) 2021; 8:223-244. [PMID: 34527763 PMCID: PMC8436972 DOI: 10.1080/23328940.2021.1922261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 04/22/2021] [Accepted: 04/23/2021] [Indexed: 11/05/2022] Open
Abstract
Enhanced intestinal permeability is a pervasive issue in modern medicine, with implications demonstrably associated with significant health consequences such as sepsis, multiorgan failure, and death. Key issues involve the trigger mechanisms that could compromise intestinal integrity and increase local permeability allowing the passage of larger, potentially dangerous molecules. Heat stress, whether exertional or environmental, may modulate intestinal permeability and begs interesting questions in the context of global climate change, increasing population vulnerabilities, and public health. Emerging evidence indicates that intestinal leakage of digestive enzymes and associated cell dysfunctions--a process referred to as autodigestion--may play a critical role in systemic physiological damage within the body. This increased permeability is exacerbated in the presence of elevated core temperatures. We employed Latent Dirichlet Allocation (LDA) topic modeling methods to analyze the relationship between heat stress and the nascent theory of autodigestion in a systematic, quantifiable, and unbiased manner. From a corpus of 11,233 scientific articles across four relevant scientific journals (Gut, Shock, Temperature, Gastroenterology), it was found that over 1,000 documents expressed a relationship between intestine, enhanced permeability, core temperature, and heat stress. The association has grown stronger in recent years, as heat stress and potential autodigestion are investigated in tandem, yet still by a limited number of specific research studies. Such findings justify the design of future studies to critically test novel interventions against digestive enzymes permeating the intestinal tract, especially the small intestine.
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Affiliation(s)
- Anthony A. Fung
- Department of Bioengineering, University of California San Diego, La Jolla, CA, USA
| | - Andy Zhou
- Department of Bioengineering, University of California San Diego, La Jolla, CA, USA
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Chao G, Wang Z, Yang C, Qian Y, Zhang S. Teprenone ameliorates diclofenac-induced small intestinal injury via inhibiting protease activated receptors 1 and 2 activity. Biomarkers 2020; 26:38-44. [PMID: 33176506 DOI: 10.1080/1354750x.2020.1849405] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVE This study aimed to investigate specific protein expression of injured intestinal mucosa induced by diclofenac, and explore the protective effects of teprenone on it. METHODS Intestinal damage of Sprague Dawley male rats was gradually induced by the intragastric administration of diclofenac. After the last drug administration, the intestinal mucosa was taken off with an interval of 24 h, subsequently, its general histological injury and ultrastructure were observed and analysed by a transmission electron microscope. The expression levels of PAR1 and PAR2 protein were detected by immunohistochemistry and real-time polymerase chain reaction (PCR). RESULTS The Reuter and Chiu scores of small intestinal damage were 5.63 ± 1.30 and 4.25 ± 0.70 respectively in the model group, which could be protected by teprenone (100 mg/kg⋅day) with the degree of 55.7% and 44%. Optical microscopy and transmission electron microscope showed that intestinal mucosa and ultrastructure were severely damaged. Distributed in the cytoplasm or aligned with the nucleus, the expression of PAR1 and PAR2 was significantly upregulated after the administration of diclofenac, while it was relieved after the treatment of teprenone. CONCLUSION Our study presents a new view that teprenone might protect NSAIDs-induced (diclofenac) intestinal injury via suppressing the expression of PAR1 and PAR2.
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Affiliation(s)
- Guanqun Chao
- Department of Family Medicine, Sir Run Run Shaw Hospital, Zhejiang University, China
| | - Zhaojun Wang
- Department of Gastroenterology, The First Affiliated Hospital, Zhejiang Chinese Medical University, China
| | - Chaoyu Yang
- Department of Gastroenterology, The First Affiliated Hospital, Zhejiang Chinese Medical University, China
| | - Yanna Qian
- Department of Gastroenterology, The First Affiliated Hospital, Zhejiang Chinese Medical University, China
| | - Shuo Zhang
- Department of Gastroenterology, The First Affiliated Hospital, Zhejiang Chinese Medical University, China
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Li L, Tan H, Zou Z, Gong J, Zhou J, Peng N, Su L, Maegele M, Cai D, Gu Z. Preventing necroptosis by scavenging ROS production alleviates heat stress-induced intestinal injury. Int J Hyperthermia 2020; 37:517-530. [PMID: 32423248 DOI: 10.1080/02656736.2020.1763483] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Background: Worldwide heat stroke incidence has increased in recent years and is associated with high morbidity and mortality. Therefore, it is critical to identify mechanisms that mediate heat stroke. Previous studies suggested that damage to the small intestine may be a major factor in heat stroke-related morbidity and mortality. However, the mechanism underlying heat stroke related small intestine injury remains unclear.Methods: To explore how heat stroke promotes intestinal damage, we applied two well established models: mouse and IEC-6 cells heat stress (HS) to mimic heat stroke both in vivo and in vitro. The percentages of viability and cell death were assessed by WST-1 and LDH release assays. Induction of HS-induced cell death was analyzed by flow cytometry with Annexin V-FITC/PI staining. Flow cytometry was used to analyze HS-induced mitochondrial superoxide with MitoSOX staining. Malondialdehyde (MDA) levels and superoxide dismutase (SOD) levels were detected by ELISA. Flow cytometry was used to analyze HS-induced mitochondrial depolarization (low ΔΨm) with JC-1 staining. Histopathology changes in the ileum were detected by H&E staining.The ileum ultrastructure was observed by transmission electron microscopy (TEM). RIPK1, RIPK3, phosphorylated MLKL, and MLKL levels were detected by Western blot. RIPK1-RIPK3 complexes were measured by immunoprecipitation assay.Results: HS increased both necrotic cell rate and RIPK1, RIPK3, and phosphorylated MLKL expression levels in IEC-6 cells. These increased expression levels promoted higher RIPK1-RIPK3 complex formation, leading to necrosome formation both in vivo and in vitro. Moreover, HS caused dyshomeostasis, an oxidative stress response, and mitochondrial damage, along with small intestinal tissue injury and cell death. However, IEC-6 cells or mice pretreated with the RIPK1 activity chemical inhibitor Nec-1 or RIPK3 activity chemical inhibitor GSK'872 significantly reversed these phenomena and promoted balance in oxidative stress response homeostasis. More importantly, the reactive oxygen species (ROS) scavenger N-acetyl-L-cysteine (NAC) pretreatment significantly inhibited HS-induced RIPK1/RIPK3-dependent necroptosis formation both in vivo and in vitro, suggesting that preventing necroptosis via scavenging ROS production might alleviate HS-induced small intestinal tissue injury and cell death.Conclusion: This study provides strong evidence that HS causes damage to both the small intestine and intestinal epithelial cells, scavenging ROS production can significantly alleviate such RIPK1/RIPK3-dependent necroptosis, mediating HS-induced intestinal damage both in vitro and in vivo. These findings provide a clear target for future mechanism-based therapeutic strategies for patients diagnosed with heat stroke.
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Affiliation(s)
- Li Li
- Academy of Orthopedics, Guangdong Province, Guangdong Provincial Key Laboratory of Bone and Joint Degenerative Diseases, The Third Affiliated Hospital of Southern Medical University, Guangzhou, Guangdong, China.,Department of Pathophysiology, Southern Medical University, Guangdong provincial key laboratory of shock and microcirculation research, Guangzhou, Guangdong, China
| | - Hongping Tan
- Department of epilepsy centre, Guangdong Sanjiu Brain Hospital, Guangzhou China
| | - Zhimin Zou
- Department of Pathophysiology, Southern Medical University, Guangdong provincial key laboratory of shock and microcirculation research, Guangzhou, Guangdong, China
| | - Jian Gong
- Department of Intensive Care Unit, Third People's Hospital of Shenzhen, Shenzhen, Guangdong, China
| | - Junjie Zhou
- Department of Intensive Care Unit, Heyuan People's Hospital, Heyuan, Guangdong, China
| | - Na Peng
- Department of Intensive Care Unit, General Hospital of Southern Theater Command, PLA; Key Laboratory of Tropical Zone Trauma Care and Tissue Repair of PLA, Guangzhou, Guangdong, China
| | - Lei Su
- Department of Intensive Care Unit, General Hospital of Southern Theater Command, PLA; Key Laboratory of Tropical Zone Trauma Care and Tissue Repair of PLA, Guangzhou, Guangdong, China
| | - Marc Maegele
- Academy of Orthopedics, Guangdong Province, Guangdong Provincial Key Laboratory of Bone and Joint Degenerative Diseases, The Third Affiliated Hospital of Southern Medical University, Guangzhou, Guangdong, China.,Department of Treatment Center for Traumatic Injuries, The Third Affiliated Hospital of Southern Medical University, Guangzhou, Guangdong, China.,Department of Traumatology and Orthopedic Surgery, Cologne-Merheim Medical Center (CMMC), University Witten/Herdecke (UW/H), Cologne, Germany
| | - Daozhang Cai
- Academy of Orthopedics, Guangdong Province, Guangdong Provincial Key Laboratory of Bone and Joint Degenerative Diseases, The Third Affiliated Hospital of Southern Medical University, Guangzhou, Guangdong, China.,Department of Orthopedics, The Third Affiliated Hospital of Southern Medical University, Guangzhou, Guangdong, China
| | - Zhengtao Gu
- Academy of Orthopedics, Guangdong Province, Guangdong Provincial Key Laboratory of Bone and Joint Degenerative Diseases, The Third Affiliated Hospital of Southern Medical University, Guangzhou, Guangdong, China.,Department of Pathophysiology, Southern Medical University, Guangdong provincial key laboratory of shock and microcirculation research, Guangzhou, Guangdong, China.,Department of Treatment Center for Traumatic Injuries, The Third Affiliated Hospital of Southern Medical University, Guangzhou, Guangdong, China
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Heuberger DM, Schuepbach RA. Protease-activated receptors (PARs): mechanisms of action and potential therapeutic modulators in PAR-driven inflammatory diseases. Thromb J 2019; 17:4. [PMID: 30976204 PMCID: PMC6440139 DOI: 10.1186/s12959-019-0194-8] [Citation(s) in RCA: 165] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 03/08/2019] [Indexed: 12/29/2022] Open
Abstract
Inflammatory diseases have become increasingly prevalent with industrialization. To address this, numerous anti-inflammatory agents and molecular targets have been considered in clinical trials. Among molecular targets, protease-activated receptors (PARs) are abundantly recognized for their roles in the development of chronic inflammatory diseases. In particular, several inflammatory effects are directly mediated by the sensing of proteolytic activity by PARs. PARs belong to the seven transmembrane domain G protein-coupled receptor family, but are unique in their lack of physiologically soluble ligands. In contrast with classical receptors, PARs are activated by N-terminal proteolytic cleavage. Upon removal of specific N-terminal peptides, the resulting N-termini serve as tethered activation ligands that interact with the extracellular loop 2 domain and initiate receptor signaling. In the classical pathway, activated receptors mediate signaling by recruiting G proteins. However, activation of PARs alternatively lead to the transactivation of and signaling through receptors such as co-localized PARs, ion channels, and toll-like receptors. In this review we consider PARs and their modulators as potential therapeutic agents, and summarize the current understanding of PAR functions from clinical and in vitro studies of PAR-related inflammation.
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Affiliation(s)
- Dorothea M Heuberger
- Institute of Intensive Care Medicine, University Hospital Zurich, University of Zurich, Zurich, Switzerland.,Surgical Research Division, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Reto A Schuepbach
- Institute of Intensive Care Medicine, University Hospital Zurich, University of Zurich, Zurich, Switzerland
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Wu F, Guo X, Xu J, Wang W, Li B, Huang Q, Su L, Xu Q. Role of myosin light chain and myosin light chain kinase in advanced glycation end product-induced endothelial hyperpermeability in vitro and in vivo. Diab Vasc Dis Res 2016; 13:137-44. [PMID: 26607798 DOI: 10.1177/1479164115610469] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
We have previously reported that advanced glycation end products activated Rho-associated protein kinase and p38 mitogen-activated protein kinase, causing endothelial hyperpermeability. However, the mechanisms involved were not fully clarified. Here, we explored the role of myosin light chain kinase in advanced glycation end product-induced endothelial hyperpermeability. Myosin light chain phosphorylation significantly increased by advanced glycation end products in endothelial cells in a time- and dose-dependent manner, indicating that myosin light chain phosphorylation is involved in the advanced glycation end product pathway. Advanced glycation end products also induced myosin phosphatase-targeting subunit 1 phosphorylation, and small interfering RNA knockdown of the receptor for advanced glycation end products, or blocking myosin light chain kinase with its inhibitor, ML-7, or small interfering RNA abated advanced glycation end product-induced myosin light chain phosphorylation. Advanced glycation end product-induced F-actin rearrangement and endothelial hyperpermeability were also diminished by inhibition of receptor for advanced glycation end product or myosin light chain kinase signalling. Moreover, inhibiting myosin light chain kinase with ML-7 or blocking receptor for advanced glycation end product with its neutralizing antibody attenuated advanced glycation end product-induced microvascular hyperpermeability. Our findings suggest a novel role for myosin light chain and myosin light chain kinase in advanced glycation end product-induced endothelial hyperpermeability.
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Affiliation(s)
- Fan Wu
- Key Laboratory of Shock and Microcirculation Research of Guangdong Province, Department of Pathophysiology, Southern Medical University, Guangzhou, China Department of Nephrology, The Third Hospital of Zhengzhou, Zhengzhou, China
| | - Xiaohua Guo
- Key Laboratory of Shock and Microcirculation Research of Guangdong Province, Department of Pathophysiology, Southern Medical University, Guangzhou, China
| | - Jing Xu
- Key Laboratory of Shock and Microcirculation Research of Guangdong Province, Department of Pathophysiology, Southern Medical University, Guangzhou, China
| | - Weiju Wang
- Key Laboratory of Shock and Microcirculation Research of Guangdong Province, Department of Pathophysiology, Southern Medical University, Guangzhou, China
| | - Bingling Li
- Postdoctoral Workstation, Huabo Bio-Pharmaceutical Research Institute, Guangzhou, China
| | - Qiaobing Huang
- Key Laboratory of Shock and Microcirculation Research of Guangdong Province, Department of Pathophysiology, Southern Medical University, Guangzhou, China
| | - Lei Su
- Key Laboratory of Tropical Zone Trauma Care and Tissue Repair of PLA, Department of ICU, General Hospital of Guangzhou Military Command, Guangzhou, China
| | - Qiulin Xu
- Postdoctoral Workstation, Huabo Bio-Pharmaceutical Research Institute, Guangzhou, China Key Laboratory of Tropical Zone Trauma Care and Tissue Repair of PLA, Department of ICU, General Hospital of Guangzhou Military Command, Guangzhou, China
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9
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He S, Liu F, Xu L, Yin P, Li D, Mei C, Jiang L, Ma Y, Xu J. Protective Effects of Ferulic Acid against Heat Stress-Induced Intestinal Epithelial Barrier Dysfunction In Vitro and In Vivo. PLoS One 2016; 11:e0145236. [PMID: 26894689 PMCID: PMC4760716 DOI: 10.1371/journal.pone.0145236] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 11/30/2015] [Indexed: 12/24/2022] Open
Abstract
Heat stress is important in the pathogenesis of intestinal epithelial barrier dysfunction. Ferulic acid (FA), a phenolic acid widely found in fruits and vegetables, can scavenge free radicals and activate cell stress responses. This study is aimed at investigating protective effects of FA on heat stress-induced dysfunction of the intestinal epithelial barrier in vitro and in vivo. Intestinal epithelial (IEC-6) cells were pretreated with FA for 4 h and then exposed to heat stress. Heat stress caused decreased transepithelial electrical resistance (TER) and increased permeability to 4-kDa fluorescein isothiocyanate (FITC)-dextran (FD4). Both effects were inhibited by FA in a dose-dependent manner. FA significantly attenuated the decrease in occludin, ZO-1 and E-cadherin expression observed with heat stress. The distortion and redistribution of occludin, ZO-1 and E-cadherin proteins were also effectively prevented by FA pretreatment. Moreover, heat stress diminished electron-dense material detected in tight junctions (TJs), an effect also alleviated by FA in a dose-dependent manner. In an in vivo heat stress model, FA (50 mg/kg) was administered to male Sprague–Dawley rats for 7 consecutive days prior to exposure to heat stress. FA pretreatment significantly attenuated the effects of heat stress on the small intestine, including the increased FD4 permeability, disrupted tight junctions and microvilli structure, and reduced occludin, ZO-1 and E-cadherin expression. Taken together, our results demonstrate that FA pretreatment is potentially protective against heat stress-induced intestinal epithelial barrier dysfunction.
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Affiliation(s)
- Shasha He
- CAU-BUA TCVM Teaching and Researching Team, College of Veterinary Medicine, China Agricultural University (CAU), Beijing, P. R. China
| | - Fenghua Liu
- Beijing Key Laboratory of Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture (BUA), Beijing, P. R. China
| | - Lei Xu
- Beijing Key Laboratory of Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture (BUA), Beijing, P. R. China
| | - Peng Yin
- CAU-BUA TCVM Teaching and Researching Team, College of Veterinary Medicine, China Agricultural University (CAU), Beijing, P. R. China
| | - Deyin Li
- Beijing Key Laboratory of Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture (BUA), Beijing, P. R. China
| | - Chen Mei
- Beijing Key Laboratory of Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture (BUA), Beijing, P. R. China
| | - Linshu Jiang
- Beijing Key Laboratory of Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture (BUA), Beijing, P. R. China
- * E-mail: (LJ); (YM); (JX)
| | - Yunfei Ma
- CAU-BUA TCVM Teaching and Researching Team, College of Veterinary Medicine, China Agricultural University (CAU), Beijing, P. R. China
- * E-mail: (LJ); (YM); (JX)
| | - Jianqin Xu
- CAU-BUA TCVM Teaching and Researching Team, College of Veterinary Medicine, China Agricultural University (CAU), Beijing, P. R. China
- * E-mail: (LJ); (YM); (JX)
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Lerner A, Matthias T. Rheumatoid arthritis-celiac disease relationship: joints get that gut feeling. Autoimmun Rev 2015; 14:1038-47. [PMID: 26190704 DOI: 10.1016/j.autrev.2015.07.007] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 07/09/2015] [Indexed: 12/11/2022]
Abstract
Rheumatoid arthritis (RA) and celiac disease (CD) belong to the autoimmune disease family. Despite being separate entities they share multiple aspects. Epidemiologically they share comparable incidence environmental influences, associated antibodies and a recent incidental surge. They differ in their HLA pre-dispositions and specific predictive and diagnostic biomarkers. At the clinical level, celiac disease exhibits extra-intestinal rheumatic manifestations and RA gastrointestinal ones. Small bowel pathology exists in rheumatic patients. A trend towards responsiveness to a gluten free diet has been observed, ameliorating celiac rheumatic manifestations, whereas dietary interventions for rheumatoid arthritis remain controversial. Pathophysiologically, both diseases are mediated by endogenous enzymes in the target organs. The infectious, dysbiotic and increased intestinal permeability theories, as drivers of the autoimmune cascade, apply to both diseases. Contrary to their specific HLA pre-disposition, the diseases share multiple non-HLA loci. Those genes are crucial for activation and regulation of adaptive and innate immunity. Recently, light was shed on the interaction between host genetics and microbiota composition in relation to CD and RA susceptibility, connecting bugs and us and autoimmunity. A better understanding of the above mentioned similarities in the gut-joint inter-relationship, may elucidate additional facets in the mosaic of autoimmunity, relating CD to RA.
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Affiliation(s)
- Aaron Lerner
- Pediatric Gastroenterology and Nutrition Unit, Carmel Medical Center, B. Rappaport School of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.
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