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Wang X, Zhang T, Li W, Wang H, Yan L, Zhang X, Zhao L, Wang N, Zhang B. Arginine alleviates Clostridium perfringens α toxin-induced intestinal injury in vivo and in vitro via the SLC38A9/mTORC1 pathway. Front Immunol 2024; 15:1357072. [PMID: 38638435 PMCID: PMC11024335 DOI: 10.3389/fimmu.2024.1357072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Accepted: 03/26/2024] [Indexed: 04/20/2024] Open
Abstract
Introduction Clostridium perfringens α toxin is a main virulence factor responsible for gut damage in animals. Arginine is a functional amino acid exhibiting significant immunoregulatory activities. However, the effects and immunoregulatory mechanisms of arginine supplementation on α toxin-induced intestinal injury remain unclear. Methods In vivo, 256 male Arbor Acres chickens were randomly assigned to a 2×2 factorial arrangement, involving diet treatments (with or without 0.3% arginine supplementation) and immunological stress (with or without α toxin challenge). In vitro, IEC-6 cells were treated with or without arginine in the presence or absence of α toxin. Moreover, IEC-6 cells were transfected with siRNA targeting mTOR and SLC38A9 to explore the underlying mechanisms. Results and discussion The results showed that in vivo, arginine supplementation significantly alleviated the α toxin-induced growth performance impairment, decreases in serum immunoglobulin (Ig)A and IgG levels, and intestinal morphology damage. Arginine supplementation also significantly reduced the α toxin-induced increase in jejunal proinflammatory cytokines interleukin (IL)-1β, IL-6 and IL-17 mRNA expression. Clostridium perfringens α toxin significantly decreased jejunal mechanistic target of rapamycin (mTOR) and solute carrier family 38 member 9 (SLC38A9) mRNA expression, while arginine supplementation significantly increased mTOR and SLC38A9 mRNA expression. In vitro, arginine pretreatment mitigated the α toxin-induced decrease in cell viability and the increase in cytotoxicity and apoptosis. Arginine pretreatment also alleviated the α toxin-induced upregulation of mRNA expression of inflammation-related cytokines IL-6, C-X-C motif chemokine ligand (CXCL)10, CXCL11 and transforming growth factor-β (TGF-β), as well as apoptosis-related genes B-cell lymphoma-2 associated X protein (Bax), B-cell lymphoma-2 (Bcl-2), B-cell lymphoma-extra large (Bcl-XL) and cysteinyl aspartate specific proteinase 3 (Caspase-3) and the ratio of Bax to Bcl-2. Arginine pretreatment significantly increased the α toxin-induced decrease in mTOR, SLC38A9, eukaryotic translation initiation factor 4E (eIF4E)-binding protein 1 (4EBP1) and ribosomal protein S6 kinase (S6K) mRNA expression. Knockdown SLC38A9 and mTOR largely abrogated the positive effects of arginine pretreatment on α toxin-induced intracellular changes. Furthermore, SLC38A9 silencing abolished the increased mTOR mRNA expression caused by arginine pretreatment. In conclusion, arginine administration attenuated α toxin-induced intestinal injury in vivo and in vitro, which could be associated with the downregulation of inflammation via regulating SLC38A9/mTORC1 pathway.
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Affiliation(s)
- Xiaohui Wang
- College of Animal Science and Technology, Qingdao Agricultural University, Qingdao, China
| | - Tong Zhang
- College of Animal Science and Technology, Qingdao Agricultural University, Qingdao, China
| | - Wenli Li
- College of Animal Science and Technology, Qingdao Agricultural University, Qingdao, China
| | - Heliang Wang
- Qingdao Sino-science Gene Technology Co., Ltd, Qingdao, China
| | - Lei Yan
- Shandong New Hope Liuhe Group, Qingdao, China
| | - Xiaowen Zhang
- College of Animal Science and Technology, Qingdao Agricultural University, Qingdao, China
| | - Lianwen Zhao
- College of Animal Science and Technology, Qingdao Agricultural University, Qingdao, China
| | - Nianxue Wang
- College of Animal Science and Technology, Qingdao Agricultural University, Qingdao, China
| | - Beibei Zhang
- College of Animal Science and Technology, Qingdao Agricultural University, Qingdao, China
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Yu YH, Zhao XH. Longan Polysaccharides with Covalent Selenylation Combat the Fumonisin B1-Induced Cell Toxicity and Barrier Disruption in Intestinal Epithelial (IEC-6) Cells. Nutrients 2023; 15:4679. [PMID: 37960333 PMCID: PMC10650868 DOI: 10.3390/nu15214679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 10/25/2023] [Accepted: 10/31/2023] [Indexed: 11/15/2023] Open
Abstract
In this study, the soluble, but non-digestible, longan (Dimocarpus longan Lour.) polysaccharides (LP) were extracted from dried longan fruits and then chemically selenylated to produce two selenylated products, namely SeLP1 and SeLP2, with different selenylation extents. The aim was to investigate their protective effects on rat intestinal epithelial (IEC-6) cells exposed to the food toxin fumonisin B1 (FB1). LP only contained total Se content of less than 0.01 g/kg, while SeLP1 and SeLP2 were measured with respective total Se content of up to 1.46 and 4.79 g/kg. The cell viability results showed that these two selenylated products were more efficient than LP in the IEC-6 cells in alleviating FB1-induced cell toxicity, suppressing lactate dehydrogenase (LDH) release, and decreasing the generation of intracellular reactive oxygen species (ROS). These two selenylated products were also more effective than LP in combating FB1-induced barrier disruption via increasing the transepithelial electric resistance (TEER), reducing the paracellular permeability, decreasing the mitochondrial membrane potential (MMP) loss, and maintaining cell barrier integrity by upregulating the tight-junction-related genes and proteins. FB1 caused cell oxidative stress and barrier dysfunction by activating the MAPK and mitochondrial apoptosis signaling pathways, while SeLP1 and SeLP2 could regulate the tMAPK- and apoptosis-related proteins to suppress the FB1-mediated activation of the two pathways. Overall, SeLP2 was observed to be more active than SeLP1 in the IEC-6 cells. In conclusion, the chemical selenylation of LP caused an activity enhancement to ameliorate the FB1-induced cell cytotoxicity and intestinal barrier disruption. Meanwhile, the increased selenylation of LP would endow the selenylated product SeLP2 with more activity.
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Affiliation(s)
- Ya-Hui Yu
- School of Biology and Food Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China
- Research Centre of Food Nutrition and Human Healthcare, Guangdong University of Petrochemical Technology, Maoming 525000, China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong University of Petrochemical Technology, Maoming 525000, China
| | - Xin-Huai Zhao
- School of Biology and Food Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China
- Research Centre of Food Nutrition and Human Healthcare, Guangdong University of Petrochemical Technology, Maoming 525000, China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong University of Petrochemical Technology, Maoming 525000, China
- College of Food Science, Northeast Agricultural University, Harbin 150030, China
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Fan J, Zhang Q, Zhao XH, Zhang N. The Impact of Heat Treatment of Quercetin and Myricetin on their Activities to Alleviate the Acrylamide-Induced Cytotoxicity and Barrier Loss in IEC-6 Cells. Plant Foods Hum Nutr 2022; 77:436-442. [PMID: 35916997 DOI: 10.1007/s11130-022-00994-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/11/2022] [Indexed: 06/15/2023]
Abstract
Two flavonols quercetin and myricetin were assessed for their in vitro activities to attenuate the acrylamide-induced cytotoxicity and barrier loss in rat intestinal epithelial (IEC-6) cells and to identify whether heat treatment of the flavonols might cause activity changes. The results showed that the flavonols could alleviate the acrylamide-caused cell injury, resulting in higher cell viability, lower lactate dehydrogenase release, and less formation of reactive oxygen species. Meanwhile, the flavonols could antagonize the acrylamide-induced barrier dysfunction via decreasing the paracellular permeability, increasing the transepithelial resistance of cell monolayer, and enhancing the expression of three tight junction proteins namely occludin, claudin-1, and zonula occludens-1. The flavonols also could down-regulate the expression of JNK/Src proteins and thus cause lower relative protein ratios of p-JNK/JNK and p-Src/Src, resulting in a suppressed JNK/Src activation. Totally, quercetin was more potent than myricetin to exert these assessed activities, while the heated flavonols obtained lower activity than the unheated ones. It is thus concluded that the flavonols had beneficial activities towards the intestinal epithelial cells with acrylamide exposure by alleviating the acrylamide-induced cytotoxicity and barrier disruption, while heat treatment of the flavonols was unfavorable because it led to a reduced flavonol activity to the cells.
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Affiliation(s)
- Jing Fan
- College of Food Engineering, Harbin University of Commerce, 150028, Harbin, People's Republic of China
- School of Biological and Food Engineering, Guangdong University of Petrochemical Technology, 525000, Maoming, People's Republic of China
| | - Qiang Zhang
- School of Biological and Food Engineering, Guangdong University of Petrochemical Technology, 525000, Maoming, People's Republic of China
- Research Centre of Food Nutrition and Human Healthcare, Guangdong University of Petrochemical Technology, 525000, Maoming, People's Republic of China
| | - Xin-Huai Zhao
- School of Biological and Food Engineering, Guangdong University of Petrochemical Technology, 525000, Maoming, People's Republic of China.
| | - Na Zhang
- College of Food Engineering, Harbin University of Commerce, 150028, Harbin, People's Republic of China.
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Zhang D, Zhu Y, Li Z, Luo M, Liang X, Wang A, Zhu H, Hu L, Li R. The role of Astragalus polysaccharides in promoting IEC-6 cell migration from polyamine-mediated Ca 2+ regulation. Int J Biol Macromol 2022; 207:179-192. [PMID: 35217086 DOI: 10.1016/j.ijbiomac.2022.02.109] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 02/07/2022] [Accepted: 02/17/2022] [Indexed: 11/05/2022]
Abstract
Astragalus polysaccharide (APS) has a protective effect on injured intestinal mucosa by promoting intestinal cell migration, but the specific mechanism is unclear. The polyamine-mediated calcium signaling pathway is an important mechanism of cell migration, generally, and we tested the hypothesis that APS can protect damaged intestinal mucosa through the polyamine-mediated calcium signaling pathway. High-performance liquid chromatography (HPLC), infrared chromatography, cell scratch test, Western blot, co-immunoprecipitation, polyamine inhibitor (DFMO), si-Cav1, RhoA inhibitor (Rhosin) and Rac1 inhibitor (NSC23766) were used to detect the pharmacodynamic of APS. The results show that APS can promote cell migration. In addition, APS increased the formations of RhoA/TRPC1, Cav1/TRPC1, and Rac1/PLCγ-1 complexes as well as the expressions of TRPC1, PLCγ-1, RhoA, Cav1, and Rac1, and it reversed the inhibitory effect of DFMO on the above factors. APS also reversed the inhibitory effect of si-Cav1 on Cav1 expression, cytoplasmic Ca2+ concentrations ([Ca2+]cyt), and cell migration. Moreover, APS removed the inhibition of NSC23766 and Rhosin on [Ca2+]cyt and cell migration. In vivo study, the water extract of Astragalus membranaceus (WEA) (15 g/kg) reduced the indomethacin-induced injury of intestinal mucosa as well. These observations suggest that APS can treat gastrointestinal mucosal injury through the polyamine calcium signaling pathway.
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Affiliation(s)
- Dong Zhang
- Institute of Piwei, Science and Technology Innovation Center, Guangzhou University of Traditional Chinese Medicine, No. 12, Jichang Road, Baiyun District, Guangzhou 510000, China
| | - Yiping Zhu
- Institute of Piwei, Science and Technology Innovation Center, Guangzhou University of Traditional Chinese Medicine, No. 12, Jichang Road, Baiyun District, Guangzhou 510000, China
| | - Zhijin Li
- Institute of Piwei, Science and Technology Innovation Center, Guangzhou University of Traditional Chinese Medicine, No. 12, Jichang Road, Baiyun District, Guangzhou 510000, China
| | - Meng Luo
- Institute of Piwei, Science and Technology Innovation Center, Guangzhou University of Traditional Chinese Medicine, No. 12, Jichang Road, Baiyun District, Guangzhou 510000, China
| | - Xinyi Liang
- Institute of Piwei, Science and Technology Innovation Center, Guangzhou University of Traditional Chinese Medicine, No. 12, Jichang Road, Baiyun District, Guangzhou 510000, China
| | - Anrong Wang
- Institute of Piwei, Science and Technology Innovation Center, Guangzhou University of Traditional Chinese Medicine, No. 12, Jichang Road, Baiyun District, Guangzhou 510000, China
| | - Huibin Zhu
- Institute of Piwei, Science and Technology Innovation Center, Guangzhou University of Traditional Chinese Medicine, No. 12, Jichang Road, Baiyun District, Guangzhou 510000, China
| | - Ling Hu
- Institute of Piwei, Science and Technology Innovation Center, Guangzhou University of Traditional Chinese Medicine, No. 12, Jichang Road, Baiyun District, Guangzhou 510000, China
| | - Ruliu Li
- Institute of Piwei, Science and Technology Innovation Center, Guangzhou University of Traditional Chinese Medicine, No. 12, Jichang Road, Baiyun District, Guangzhou 510000, China.
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Yao W, Liu M, Chen X, You L, Ma Y, Hileuskaya K. Effects of UV/H 2O 2 degradation and step gradient ethanol precipitation on Sargassum fusiforme polysaccharides: Physicochemical characterization and protective effects against intestinal epithelial injury. Food Res Int 2022; 155:111093. [PMID: 35400466 DOI: 10.1016/j.foodres.2022.111093] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 03/01/2022] [Accepted: 03/02/2022] [Indexed: 11/18/2022]
Abstract
In this study, the degraded purified fraction from Sargassum fusiforme polysaccharides (SFP), named DSFP, was produced by the treatment of ultraviolet/hydrogen peroxide (UV/H2O2) degradation and step gradient ethanol precipitation. Results showed that the treatment significantly reduced the molecular weight of polysaccharides, from 282.83 kDa to 18.54 kDa, and influenced their surface morphology and roughness. SFP and DSFP were typical sulfated polysaccharides, mainly composed of fucose, galacturonic acid, glucuronic acid, galactose, and mannose. Both SFP and DSFP increased cell migration during intestinal epithelial wound healing and stimulated the cell cycle progression by promoting the transition from G0/G1 to S phase in the rat intestine epithelium cells (IEC-6). But DSFP had a stronger positive effect on wound healing and cell migration than SFP. It reinforced the intestinal barrier function and attenuated lipopolysaccharides-induced intestinal inflammation. DSFP significantly downregulated the expression of Toll-like receptor 4, tumor necrosis factor-α, interleukin-6, interleukin-1β, and inducible nitric oxide synthase by 53.14%, 92.41%, 66.01%, 68.24%, and 78.09%, respectively, and upregulated that of interleukin-10 by 2.48 folds when compared to the model. Therefore, the treatment (UV/H2O2 degradation and step gradient ethanol precipitation) could effectively improve the protective effects against intestinal epithelial injury.
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Affiliation(s)
- Wanzi Yao
- School of Food Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China; Research Institute for Food Nutrition and Human Health (111 Center), Guangzhou, Guangdong 510640, China
| | - Mengyuan Liu
- School of Food Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China; Research Institute for Food Nutrition and Human Health (111 Center), Guangzhou, Guangdong 510640, China
| | - Xiaoyong Chen
- School of Food Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China; Research Institute for Food Nutrition and Human Health (111 Center), Guangzhou, Guangdong 510640, China
| | - Lijun You
- School of Food Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China; Research Institute for Food Nutrition and Human Health (111 Center), Guangzhou, Guangdong 510640, China.
| | - Yongxuan Ma
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, Guangdong 510610, China
| | - Kseniya Hileuskaya
- Institute of Chemistry of New Materials of National Academy of Science of Belarus
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Mariott M, Mariano LNB, Boeing T, Cechinel Zanchett CC, Salamanca E, Bella Cruz A, Giménez A, Cechinel Filho V, da Silva LM. Preparations from Campomanesia reitziana reduce the gastrointestinal motility and castor oil-induced diarrhea in a non-opioid and non-dopaminergic pathway in mice and display antimicrobial activity in vitro. Neurogastroenterol Motil 2022; 34:e14277. [PMID: 34662472 DOI: 10.1111/nmo.14277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 08/27/2021] [Accepted: 09/20/2021] [Indexed: 01/15/2023]
Abstract
BACKGROUND This study investigated the antidiarrheal potential of the aqueous extract (AECR) and hydroalcoholic extract of Campomanesia reitziana leaves (HECR), its ethyl acetate (EAF) and dichloromethane fractions (DCMF), and myricitrin isolated from EAF. METHODS The total phenols and flavonoids were measured, followed by chromatography and myricitrin isolation. The 2,2-diphenyl-1-picryl-hydrazyl scavenger activity, the cytotoxicity, and the effects on LPS-induced nitrite production in intestinal epithelial cells (IEC-6) were quantified. The effect of HECR, EAF, DCMF, and AECR on intestinal motility (IT), gastric emptying (GE), and castor oil-induced diarrhea in mice was determined, as well as its antimicrobial activity. KEY RESULTS The administration of AECR 10% (10 ml/kg, p.o), but not HECR (300 mg/kg), reduced the GE and IT by 52 and 51%. The EAF and DCMF at 300 mg/kg also reduced IT but did not change GE. Moreover, AECR and EAF, but not DCMF, inhibited the castor oil-induced diarrhea and naloxone or metoclopramide pretreatment did not change these effects. Myricitrin did not change IT and the evacuation index of mice. Finally, the dry residue of AECR inhibited bacterial growth and EAF showed bacteriostatic activity against S. aureus, E. coli, and S. typhimurium and antifungal for C. albicans. However, none of the preparations alter the viability of Giardia spp. trophozoites. CONCLUSIONS The AECR and EAF can be effective to treat diarrhea acting through opioid- or dopaminergic type 2 receptor-independent mechanisms and by its antimicrobial actions.
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Affiliation(s)
- Marihá Mariott
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações QuímicoFarmacêuticas (NIQFAR), Universidade do Vale do Itajai (UNIVALI) - Campus Itajaí, Santa Catarina, Brasil
| | - Luísa Nathália Bolda Mariano
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações QuímicoFarmacêuticas (NIQFAR), Universidade do Vale do Itajai (UNIVALI) - Campus Itajaí, Santa Catarina, Brasil
| | - Thaise Boeing
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações QuímicoFarmacêuticas (NIQFAR), Universidade do Vale do Itajai (UNIVALI) - Campus Itajaí, Santa Catarina, Brasil
| | - Camile Cecconi Cechinel Zanchett
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações QuímicoFarmacêuticas (NIQFAR), Universidade do Vale do Itajai (UNIVALI) - Campus Itajaí, Santa Catarina, Brasil
| | - Efrain Salamanca
- Instituto de Investigaciones Fármaco Bioquímicas (IIFB), Universidad Mayor de San Andrés - UMSA, La Paz, Bolívia
| | - Alexandre Bella Cruz
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações QuímicoFarmacêuticas (NIQFAR), Universidade do Vale do Itajai (UNIVALI) - Campus Itajaí, Santa Catarina, Brasil
| | - Alberto Giménez
- Instituto de Investigaciones Fármaco Bioquímicas (IIFB), Universidad Mayor de San Andrés - UMSA, La Paz, Bolívia
| | - Valdir Cechinel Filho
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações QuímicoFarmacêuticas (NIQFAR), Universidade do Vale do Itajai (UNIVALI) - Campus Itajaí, Santa Catarina, Brasil
| | - Luisa Mota da Silva
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações QuímicoFarmacêuticas (NIQFAR), Universidade do Vale do Itajai (UNIVALI) - Campus Itajaí, Santa Catarina, Brasil
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Cai SQ, Zhang Q, Zhao XH, Shi J. The In Vitro Anti-Inflammatory Activities of Galangin and Quercetin towards the LPS-Injured Rat Intestinal Epithelial (IEC-6) Cells as Affected by Heat Treatment. Molecules 2021; 26:7495. [PMID: 34946578 PMCID: PMC8703769 DOI: 10.3390/molecules26247495] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/01/2021] [Accepted: 12/09/2021] [Indexed: 01/06/2023] Open
Abstract
Flavonols possess several beneficial bioactivities in vitro and in vivo. In this study, two flavonols galangin and quercetin with or without heat treatment (100 °C for 15-30 min) were assessed for their anti-inflammatory activities in lipopolysaccharide (LPS)-stimulated rat intestinal epithelial (IEC-6) cells and whether the heat treatment caused activity changes. The flavonol dosages of 2.5-20 μmol/L had no cytotoxicity on the cells but could enhance cell viability (especially using 5 μmol/L flavonol dosage). The flavonols could decrease the production of prostaglandin E2 and three pro-inflammatory cytokines interleukin-1β (IL-1β), IL-6, and tumor necrosis factor-α, and simultaneously promote the production of two anti-inflammatory cytokines IL-10 and transforming growth factor-β. The Western-blot results verified that the flavonols could suppress the LPS-induced expression of TLR4 and phosphorylated IκBα and p65, while the molecular docking results also illustrated that the flavonols could bind with TLR4 and NF-κB to yield energy decreases of -(21.9-28.6) kJ/mol. Furthermore, an inhibitor BAY 11-7082 blocked the NF-κB signaling pathway by inhibiting the expression of phosphorylated IκBα/p65 and thus mediated the production of IL-6/IL-10 as the flavonols did, which confirmed the assessed anti-inflammatory effect of the flavonols. Consistently, galangin had higher anti-inflammatory activity than quercetin, while the heated flavonols (especially those with longer heat time) were less active than the unheated counterparts to exert these target anti-inflammatory effects. It is highlighted that the flavonols could antagonize the LPS-caused IEC-6 cells inflammation via suppressing TLR4/NF-κB activation, but heat treatment of the flavonols led to reduced anti-inflammatory efficacy.
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Affiliation(s)
- Shi-Qing Cai
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin 150030, China;
- School of Biology and Food Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China;
| | - Qiang Zhang
- School of Biology and Food Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China;
- Research Centre of Food Nutrition and Human Healthcare, Guangdong University of Petrochemical Technology, Maoming 525000, China
| | - Xin-Huai Zhao
- School of Biology and Food Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China;
- Research Centre of Food Nutrition and Human Healthcare, Guangdong University of Petrochemical Technology, Maoming 525000, China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong University of Petrochemical Technology, Maoming 525000, China
| | - Jia Shi
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin 150030, China;
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Yang J, Chen W, Sun Y, Xia P, Liu J, Zhang W. The role of microRNAs in regulating cadmium-induced apoptosis by targeting Bcl-2 in IEC-6 cells. Toxicol Appl Pharmacol 2021; 432:115737. [PMID: 34662668 DOI: 10.1016/j.taap.2021.115737] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Revised: 08/28/2021] [Accepted: 09/12/2021] [Indexed: 02/07/2023]
Abstract
Cadmium (Cd) is one of the most harmful environmental pollutants and has been found to have adverse effects on the gut. However, the toxic effects and potential mechanism of Cd on intestinal epithelial cells (IECs) are poorly understood. This study evaluated the effects of Cd exposure (0, 0.25, 0.5, 1, 2, and 4 μM) on IEC-6 cells in terms of cell viability and apoptosis, as well as apoptosis-associated gene expression. The results indicated that low doses (0.25- 1 μM) of Cd exhibited hormetic effects, while high doses of Cd (2 and 4 μM) reduced cell viability. The apoptotic effect increased in a dose-dependent pattern. Moreover, the mRNA levels of the Bcl-2, Bax and Caspase 3 genes were altered, which was in agreement with their protein expression. Based on sequencing analysis, the expression pattern of the microRNAs (miRNAs) changed significantly in the 2 μM Cd-treated group. QRT-PCR verified that 7 miRNAs, including miR-124-3p and miR-370-3p, were all upregulated with dose-effect relationship. Besides, transfection of miR-124-3p and miR-370-3p mimics /inhibitor and Bcl-2 siRNA into IEC-6 cells verified that these two miRNAs could regulate Cd-induced apoptosis by targeting Bcl-2. Finally, the direct targeting relationship between miR-370-3p and Bcl-2 gene was confirmed by luciferase reporter assay. Overall, the results demonstrated that Cd exposure could induce apoptosis in IEC-6 cells. The potential mechanism may be interference with the regulation of Bcl-2 gene expression by miR-370-3p and miR-124-3p.
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Affiliation(s)
- Jinsong Yang
- Department of Infectious Disease Prevention and Control, Fujian Center for Disease Control and Prevention, Fujian Provincial Key Laboratory of Zoonosis Research, Jintai Road No.76, 350001, China.
| | - Wei Chen
- Department of Infectious Disease Prevention and Control, Fujian Center for Disease Control and Prevention, Fujian Provincial Key Laboratory of Zoonosis Research, Jintai Road No.76, 350001, China
| | - Yi Sun
- Department of Preventive Medicine, Fujian Provincial Key Laboratory of Environmental Factors and Cancer, Key Laboratory of Environment and Health, School of Public Health, Fujian Medical University, Xueyuan Road No. 1, Minhou Coudslanty, Fuzhou 350108, China
| | - Pincang Xia
- Department of Infectious Disease Prevention and Control, Fujian Center for Disease Control and Prevention, Fujian Provincial Key Laboratory of Zoonosis Research, Jintai Road No.76, 350001, China
| | - Jin Liu
- Department of Preventive Medicine, Fujian Provincial Key Laboratory of Environmental Factors and Cancer, Key Laboratory of Environment and Health, School of Public Health, Fujian Medical University, Xueyuan Road No. 1, Minhou Coudslanty, Fuzhou 350108, China
| | - Wenchang Zhang
- Department of Preventive Medicine, Fujian Provincial Key Laboratory of Environmental Factors and Cancer, Key Laboratory of Environment and Health, School of Public Health, Fujian Medical University, Xueyuan Road No. 1, Minhou Coudslanty, Fuzhou 350108, China.
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Zhang Z, Liang M, Wan X. Roflumilast, a type of phosphodiesterase 4 inhibitor, can reduce intestinal injury caused by sepsis. Exp Ther Med 2021; 22:1398. [PMID: 34650646 PMCID: PMC8506939 DOI: 10.3892/etm.2021.10834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 08/17/2021] [Indexed: 11/10/2022] Open
Abstract
Sepsis is a systemic inflammatory response syndrome caused by infection, which has a complex mechanism. The gastrointestinal tract is commonly the first organ affected by sepsis, but intestinal disease itself can also induce sepsis. Roflumilast has been found to exert anti-inflammatory effects and, thus, the present study sought to examine its effect on intestinal damage caused by sepsis. In vivo studies were conducted using cecal ligation and puncture rat models, and in vitro experiments were performed using IEC-6 cells. The intestinal cells were first induced with lipopolysaccharide and the induced cells were then treated with roflumilast to evaluate its effects on phosphodiesterase (PDE)4 expression, intestinal function indices, release of inflammatory factors and cell apoptosis. The expression level of PDE4 in the small intestinal tissue of septic rats was found to be significantly higher compared with that in the normal group, suggesting that PDE4 may play a key role in intestinal injury caused by sepsis. It was found that roflumilast reduced PDE4 expression, as well as the levels of intestinal function indices, including lactate dehydrogenase, diamino oxidase and intestinal fatty acid-binding protein, in intestinal cells. Moreover, roflumilast reduced cellular damage, the release of inflammatory factors and apoptosis. In summary, the findings of the present study indicated that roflumilast can relieve the inflammation and apoptosis of intestinal cells caused by sepsis and can promote their functional recovery. These findings may promote the expansion of the clinical application of roflumilast in the future.
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Affiliation(s)
- Zhongyuan Zhang
- Department of Pharmacy, Tianyou Hospital Affiliated to Wuhan University of Science and Technology, Wuhan, Hubei 430060, P.R. China
| | - Meifeng Liang
- Department of Medical Insurance and Management, CR & WISCO General Hospital, Wuhan, Hubei 430000, P.R. China
| | - Xiongfei Wan
- Department of Pharmacy, CR & WISCO General Hospital, Wuhan, Hubei 430000, P.R. China
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10
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Shi J, Zhao XH, Fu Y, Lametsch R. Transglutaminase-Mediated Caseinate Oligochitosan Glycation Enhances the Effect of Caseinate Hydrolysate to Ameliorate the LPS-Induced Damage on the Intestinal Barrier Function in IEC-6 Cells. J Agric Food Chem 2021; 69:8787-8796. [PMID: 34323484 DOI: 10.1021/acs.jafc.1c02858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Some food components can regulate the intestinal barrier function. Herein, the effect of transglutaminase-type oligochitosan glycation on caseinate hydrolysate for its ability to maintain intestinal epithelial integrity and the tight junction (TJ) structure was investigated by assessing and comparing the bioactivities of glycated caseinate hydrolysate and caseinate hydrolysate against the lipopolysaccharide-induced barrier damage in the model cells (rat intestinal epithelial IEC-6 cells). The results from liquid chromatography with tandem mass spectrometry (LC-MS/MS) analysis demonstrated that oligochitosan glycation occurred at the Gln residues of α-S1-casein and α-S2-casein. The two hydrolysates retarded the lipopolysaccharide cytotoxicity toward IEC-6 cells and enhanced the barrier integrity by increasing the transepithelial electrical resistance or decreasing the paracellular permeability. In addition, these two hydrolysates could upregulate both mRNA and protein expression of three TJ proteins in IEC-6 cells. More importantly, the glycated caseinate hydrolysate had higher potential than caseinate hydrolysate to protect IEC-6 cells against the lipopolysaccharide-induced barrier damage, suggesting that the transglutaminase-mediated oligochitosan glycation of proteins is a useful approach to enforce protein biofunctions in the intestine.
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Affiliation(s)
- Jia Shi
- School of Biological and Food Engineering, Guangdong University of Petrochemical Technology, 525000 Maoming, P. R. China
- College of Food Science, Northeast Agricultural University, 150030 Harbin, P. R. China
| | - Xin-Huai Zhao
- School of Biological and Food Engineering, Guangdong University of Petrochemical Technology, 525000 Maoming, P. R. China
- College of Food Science, Northeast Agricultural University, 150030 Harbin, P. R. China
| | - Yu Fu
- College of Food Science, Southwest University, 400715 Chongqing, P. R. China
| | - Rene Lametsch
- Department of Food Science, University of Copenhagen, 1958 Frederiksberg C, Denmark
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11
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Rathor N, Chung HK, Song JL, Wang SR, Wang JY, Rao JN. TRPC1-mediated Ca 2+ signaling enhances intestinal epithelial restitution by increasing α4 association with PP2Ac after wounding. Physiol Rep 2021; 9:e14864. [PMID: 33991460 PMCID: PMC8123541 DOI: 10.14814/phy2.14864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 01/02/2021] [Accepted: 01/13/2021] [Indexed: 11/24/2022] Open
Abstract
Gut epithelial restitution after superficial wounding is an important repair modality regulated by numerous factors including Ca2+ signaling and cellular polyamines. Transient receptor potential canonical-1 (TRPC1) functions as a store-operated Ca2+ channel in intestinal epithelial cells (IECs) and its activation increases epithelial restitution by inducing Ca2+ influx after acute injury. α4 is a multiple functional protein and implicated in many aspects of cell functions by modulating protein phosphatase 2A (PP2A) stability and activity. Here we show that the clonal populations of IECs stably expressing TRPC1 (IEC-TRPC1) exhibited increased levels of α4 and PP2A catalytic subunit (PP2Ac) and that TRPC1 promoted intestinal epithelial restitution by increasing α4/PP2Ac association. The levels of α4 and PP2Ac proteins increased significantly in stable IEC-TRPC1 cells and this induction in α4/PP2Ac complexes was accompanied by an increase in IEC migration after wounding. α4 silencing by transfection with siRNA targeting α4 (siα4) or PP2Ac silencing destabilized α4/PP2Ac complexes in stable IEC-TRPC1 cells and repressed cell migration over the wounded area. Increasing the levels of cellular polyamines by stable transfection with the Odc gene stimulated α4 and PP2Ac expression and enhanced their association, thus also promoting epithelial restitution after wounding. In contrast, depletion of cellular polyamines by treatment with α-difluoromethylornithine reduced α4/PP2Ac complexes and repressed cell migration. Ectopic overexpression of α4 partially rescued rapid epithelial repair in polyamine-deficient cells. These results indicate that activation of TRPC1-mediated Ca2+ signaling enhances cell migration primarily by increasing α4/PP2Ac associations after wounding and this pathway is tightly regulated by cellular polyamines.
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Affiliation(s)
- Navneeta Rathor
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA.,Baltimore Veterans Affairs Medical Center, Baltimore, MD, USA
| | - Hee Kyoung Chung
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA.,Baltimore Veterans Affairs Medical Center, Baltimore, MD, USA
| | - Jia-Le Song
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Shelley R Wang
- Baltimore Veterans Affairs Medical Center, Baltimore, MD, USA
| | - Jian-Ying Wang
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA.,Baltimore Veterans Affairs Medical Center, Baltimore, MD, USA.,Department of Pathology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Jaladanki N Rao
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA.,Baltimore Veterans Affairs Medical Center, Baltimore, MD, USA
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12
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Wang L, Wang X, Shi Z, Shen L, Zhang J, Zhang J. Bovine milk exosomes attenuate the alteration of purine metabolism and energy status in IEC-6 cells induced by hydrogen peroxide. Food Chem 2021; 350:129142. [PMID: 33610842 DOI: 10.1016/j.foodchem.2021.129142] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 01/13/2021] [Accepted: 01/17/2021] [Indexed: 12/13/2022]
Abstract
Evidence suggests that dietary depletion of bovine milk exosomes and their cargos causes a loss of circulating microRNAs and a series of health problems. The aim of the current study was to determine whether bovine milk exosomes affect purine nucleotide metabolism and energy metabolism in oxidatively stressed intestinal crypt epithelial cells (IEC-6). Cells were pretreated with exosomes, followed by H2O2 to induce oxidative stress. Reactive oxidative species (ROS) levels, purine nucleotides, purine metabolic key enzyme activities, cell energy status, and AMPK protein expression were analysed. Exosome pretreatment reduced ROS level and the activities of adenosine deaminase and xanthine oxidase induced by H2O2 in cells. Total adenine nucleotides and energy charge were increased with exosome pretreatment, while the AMPK phosphorylation level was downregulated. The results indicated that bovine milk exosomes could attenuate purine nucleotide catabolism and improve energy status in oxidatively stressed IEC-6 cells and exerted protective effects against oxidative stress.
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Affiliation(s)
- Lanfang Wang
- Research Center for Translational Medicine at Shanghai East Hospital, Tongji University School of Medicine, Tongji University, Shanghai, PR China; Shanghai Institute of Stem Cell Research and Clinical Translation, Shanghai, PR China
| | - Xinyan Wang
- The People's Hospital of Zhaoyuan City, Shandong Province, PR China
| | - Zhexi Shi
- Research Center for Translational Medicine at Shanghai East Hospital, Tongji University School of Medicine, Tongji University, Shanghai, PR China
| | - Li Shen
- Research Center for Translational Medicine at Shanghai East Hospital, Tongji University School of Medicine, Tongji University, Shanghai, PR China
| | - Jing Zhang
- Research Center for Translational Medicine at Shanghai East Hospital, School of Life Science and Technology, Tongji University, Shanghai, PR China; Shanghai Institute of Stem Cell Research and Clinical Translation, Shanghai, PR China.
| | - Jun Zhang
- Research Center for Translational Medicine at Shanghai East Hospital, Tongji University School of Medicine, Tongji University, Shanghai, PR China; Shanghai Institute of Stem Cell Research and Clinical Translation, Shanghai, PR China.
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13
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Fan J, Zhao XH, Li TJ. Heat treatment of galangin and kaempferol inhibits their benefits to improve barrier function in rat intestinal epithelial cells. J Nutr Biochem 2020; 87:108517. [PMID: 33011286 DOI: 10.1016/j.jnutbio.2020.108517] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 09/07/2020] [Accepted: 09/24/2020] [Indexed: 12/14/2022]
Abstract
Flavonols are bioactive substances in plant foods. In this study, two flavonols galangin and kaempferol were heated at 100°C for 30 min prior to assessing their effects on barrier function of rat intestinal epithelial (IEC-6) cells. Both heated and unheated flavonols (2.5-20 µmol/L dosages) were nontoxic to the cells up to 48 h post-treatment, and could promote cell viability values to 102.2-141.2% of control. By treatment with 5 µmol/L flavonols for 24 and 48 h, the treated cells time-dependently showed better improved physical and biological barrier functions than the control cells without any flavonol treatment, including higher transepithelial electrical resistance and antibacterial effect but reduced paracellular permeability and bacterial translocation. The results from real-time PCR and western-blot assays indicated that the cells treated with heated and unheated flavonols of 5 µmol/L dosage had up-regulated mRNA (1.13-1.81 folds) and protein (1.15-5.11 folds) expression for zonula occluden-1, occludin, and claudin-1 that are vital to the tight junctions of the cells. Moreover, protein expression of RhoA and ROCK were down-regulated into 0.41-0.98 and 0.40-0.92 folds, respectively, demonstrating a Rho inactivation that led to enhanced cell barrier integrity via the RhoA/ROCK pathway. Overall, galangin was more active than kaempferol to perform three biofunctions like improving cell barrier function, up-regulating tight junctions protein expression, and down-regulating RhoA/ROCK expression. Moreover, the heated flavonols were less effective than the unheated counterparts to perform these biofunctions. It is concluded that this heat treatment of galangin and kaempferol could inhibit their benefits to improve barrier function of IEC-6 cells.
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Affiliation(s)
- Jing Fan
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin, PR China
| | - Xin-Huai Zhao
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin, PR China; School of Biology and Food Engineering, Guangdong University of Petrochemical Technology, Maoming, PR China.
| | - Tie-Jing Li
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin, PR China; College of Light Industry, Liaoning University, Shenyang, PR China.
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14
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Wang L, Shi Z, Wang X, Mu S, Xu X, Shen L, Li P. Protective effects of bovine milk exosomes against oxidative stress in IEC-6 cells. Eur J Nutr 2020; 60:317-327. [PMID: 32328746 DOI: 10.1007/s00394-020-02242-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 03/27/2020] [Indexed: 02/07/2023]
Abstract
PURPOSE Bovine milk exosomes, which are enriched with microRNAs (miRNAs) and proteins, regulate immune response and growth. In the present study, we aimed to assess the protective effects of bovine milk exosomes against oxidative stress of intestinal crypt epithelial cells (IEC-6). METHODS Bovine milk exosomes were isolated and characterized. To assess the protective effects of exosomes, IEC-6 cells were pretreated with exosomes, followed by H2O2. Cell viability and levels of superoxide dismutase (SOD), malondialdehyde (MDA), glutathione peroxidase (GPX), reactive oxidative species (ROS), and lactate dehydrogenase (LDH) were measured. The expression levels of nuclear factor erythroid 2-related factor 2 (Nrf2) and heme oxygenase 1 (Ho1) genes, and miR-146a, miR-155, and the HO-1 protein were also determined. RESULTS The isolated bovine milk exosome were positive for CD63 and CD9 expression. The exosomes were approximately circular and had a diameter of about 67.23 nm. Pretreatment of IEC-6 cells with bovine milk exosomes enhanced cell viability; increased SOD and GPX activities; and reduced LDH, ROS, and MDA levels after H2O2 challenge. Further analysis showed that exosome pretreatment increased intracellular miR-146a and miR-155 levels. Exosome pretreatment inhibited the elevation of Nrf2 and Ho1 gene expression induced by H2O2, but promoted HO-1 protein expression. CONCLUSION The results indicated that bovine milk exosomes exerted protective effects against oxidative stress in IEC-6 cells.
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Affiliation(s)
- Lanfang Wang
- Research Center for Translational Medicine at Shanghai East Hospital, Tongji University School of Medicine, 1239 Siping Road, Shanghai, 200092, People's Republic of China.
| | - Zhexi Shi
- Research Center for Translational Medicine at Shanghai East Hospital, Tongji University School of Medicine, 1239 Siping Road, Shanghai, 200092, People's Republic of China
| | - Xinyan Wang
- The People's Hospital of Zhaoyuan City, Zhaoyuan, 265400, Shandong Province, China
| | - Shu Mu
- Research Center for Translational Medicine at Shanghai East Hospital, Tongji University School of Medicine, 1239 Siping Road, Shanghai, 200092, People's Republic of China
| | - Xiaoyan Xu
- Research Center for Translational Medicine at Shanghai East Hospital, Tongji University School of Medicine, 1239 Siping Road, Shanghai, 200092, People's Republic of China
| | - Li Shen
- Department of Pathogen Biology, Tongji University School of Medicine, Shanghai, 200092, China
| | - Ping Li
- Research Center for Translational Medicine at Shanghai East Hospital, School of Life Science and Technology, Tongji University, Shanghai, 200092, China
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15
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Li J, Luo J, Zhang Y, Tang C, Wang J, Chen C. Silencing of soluble epoxide hydrolase 2 gene reduces H 2O 2-induced oxidative damage in rat intestinal epithelial IEC-6 cells via activating PI3K/Akt/GSK3β signaling pathway. Cytotechnology 2020; 72:23-36. [PMID: 31907700 PMCID: PMC7002799 DOI: 10.1007/s10616-019-00354-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 11/03/2019] [Accepted: 11/07/2019] [Indexed: 12/18/2022] Open
Abstract
Oxidative stress plays a vital role in the occurrence and development of intestinal injury. Soluble epoxide hydrolase 2 gene (EPHX2) is a class of hydrolytic enzymes. We aim to explore the effects and molecular mechanism of siEPHX2 on H2O2-induced oxidative damage in rat intestinal epithelial IEC-6 cells. IEC-6 cells were transfected with EPHX2-siRNA and control si RNA plasmids by lipofectamine™ 2000 transfection reagent. The transfected samples were treated with H2O2 (50, 100, 200, 300, 400, and 500 µmol/L) for 12, 24, and 48 h, respectively. Cell viability was determined by cell counting kit-8 (CCK-8). Lactate dehydrogenase (LDH), malondialdehyde (MDA), and superoxide dismutase (SOD) were assessed by respective detection kits. Mitochondrial membrane potential (MMP), cell apoptosis and reactive oxygen species (ROS) and the levels of factors were determined by flow cytometer, quantitative real-time PCR (qRT-PCR) and western blot assays, respectively. We found that the IC50 of H2O2 was 200 µmol/L at 24 h, and the transfection of siEHPX2 in H2O2-induced IEC-6 cells significantly promoted the cell viability, SOD activity and MMP rate, and reduced the rates of ROS and apoptosis as well as LDH and MDA contents. siEHPX2 up-regulated the B-cell lymphoma-2 (Bcl-2) level and down-regulated the levels of fibroblast-associated (Fas), Fas ligand (Fasl), Bcl-2 associated X protein (Bax), and Caspase-3. Moreover, the phosphorylation levels of phosphoinositide 3 kinase (PI3K), protein kinase B (Akt), and glycogen synthase kinase3β (GSK3β) were up-regulated. We proved that siEPHX2 had a protective effect on H2O2-induced oxidative damage in IEC-6 cells through activating PI3K/Akt/GSK3β signaling pathway.
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Affiliation(s)
- Jun Li
- Department of Gastrointestinal Surgery, Hunan Provincial People's Hospital, No. 61, Jiefang West Road, Furong District, Changsha, 410000, Hunan, China
| | - Jihui Luo
- Department of Surgical Oncology, Chenzhou No.1 People's Hospital, Chenzhou, China
| | - Yang Zhang
- Department of Burn Plastic Surgery, Hunan Provincial People's Hospital, Changsha, Hunan, China
| | - Chunming Tang
- Department of Hepatobiliary Surgery, Hunan Provincial People's Hospital, Changsha, Hunan, China
| | - Jiang Wang
- Department of Gastrointestinal Surgery, Hunan Provincial People's Hospital, No. 61, Jiefang West Road, Furong District, Changsha, 410000, Hunan, China
| | - Chaowu Chen
- Department of Gastrointestinal Surgery, Hunan Provincial People's Hospital, No. 61, Jiefang West Road, Furong District, Changsha, 410000, Hunan, China.
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16
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Shi J, Zhao XH. Chemical features of the oligochitosan-glycated caseinate digest and its enhanced protection on barrier function of the acrylamide-injured IEC-6 cells. Food Chem 2019; 290:246-254. [PMID: 31000044 DOI: 10.1016/j.foodchem.2019.04.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 03/28/2019] [Accepted: 04/01/2019] [Indexed: 02/06/2023]
Abstract
Whether caseinate oligochitosan-glycation of the transglutaminase-type followed by trypsin digestion could lead to better protection against the acrylamide-induced cell barrier damage was investigated. Compared with caseinate digest, glycated caseinate digest had similar amount of Lys and Arg but lower -NH2 (0.557 versus 0.508 mol/kg protein) and total amide (1.12 versus 1.05 mol/kg protein) contents, and contained glucosamine at 5.74 g/kg protein. Acrylamide damaged barrier function of IEC-6 cells efficiently, leading to increased paracellular permeability and lactate dehydrogenase release, decreased trans-epithelial electrical resistance, and destroyed tight junction. The two digests alleviated these barrier dysfunctions via reversing index values. Three cellular proteins (ZO-1, occludin, and claudin-1) crucial to tight junction were up-regulated by the two digests. Furthermore, glycated caseinate digest was always more effective than caseinate digest to improve cell barrier function. This oligochitosan glycation is thus desired, as it ensures glycated protein digest with higher potential to protect intestinal barrier function.
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Affiliation(s)
- Jia Shi
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin 150030, PR China
| | - Xin-Huai Zhao
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin 150030, PR China; Department of Food Science, Northeast Agricultural University, Harbin 150030, PR China.
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17
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Meurer MC, Mees M, Mariano LNB, Boeing T, Somensi LB, Mariott M, da Silva RDCMVDAF, Dos Santos AC, Longo B, Santos França TC, Klein-Júnior LC, de Souza P, de Andrade SF, da Silva LM. Hydroalcoholic extract of Tagetes erecta L. flowers, rich in the carotenoid lutein, attenuates inflammatory cytokine secretion and improves the oxidative stress in an animal model of ulcerative colitis. Nutr Res 2019; 66:95-106. [PMID: 30979660 DOI: 10.1016/j.nutres.2019.03.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 02/13/2019] [Accepted: 03/04/2019] [Indexed: 01/08/2023]
Abstract
Given the role of oxidative stress in ulcerative colitis (UC) etiology, and the amount of lutein (a carotenoid with antioxidant properties) in the dry hydroalcoholic extract of Tagetes erecta flowers (DHETE), this study investigated the intestinal anti-inflammatory properties of DHETE in an animal model of UC. The amount of lutein in the extract was determined by 1H-nuclear magnetic resonance spectroscopy, and total phenols, radical scavenger capability, cytotoxicity, and effects on reactive oxygen species and nitric oxide production were evaluated in vitro. Experimental UC was established by adding 5% dextran sulfate sodium (DSS) to drinking water, with the effects of DHETE (30-300 mg/kg, once a day for 7 days) on the morphological (colon length and weight), clinical (disease activity index and body weight loss), microscopic (histological score and mucin levels), and biochemical parameters analyzed. The lutein concentration found in DHETE was 8.2%, and DHETE scavenged 2,2-diphenyl-1-picrylhydrazyl radicals at 1000 μg/mL The exposure of intestinal epithelial cells to DHETE did not change its viability but reduced reactive oxygen species and nitric oxide production after lipopolysaccharide stimulation. In vivo, DHETE (300 mg/kg) attenuated weight loss, disease activity index, colon shortening, and histopathological changes promoted by DSS intake. Moreover, DHETE increased mucin colonic staining. The treatment with DHETE decreased myeloperoxidase activity as well as tumor necrosis factor and interleukin-6 levels. The extract also increased reduced glutathione levels and catalase activity and normalized superoxide dismutase and glutathione-S-transferase activities. In conclusion, DHETE reduced colitis severity by attenuating inflammatory cytokine secretion and improved the endogenous antioxidant defense in DSS-induced UC in mice.
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Affiliation(s)
- Marianne Caroline Meurer
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Mariéli Mees
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Luísa Nathalia Bolda Mariano
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Thaise Boeing
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Lincon Bordignon Somensi
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Marihá Mariott
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Rita de Cássia Melo Vilhena de Andrade Fonseca da Silva
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Ana Caroline Dos Santos
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Bruna Longo
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Tauini Caroline Santos França
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Luiz Carlos Klein-Júnior
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Priscila de Souza
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Sérgio Faloni de Andrade
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901
| | - Luísa Mota da Silva
- Programa de Pós-Graduação em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI)-Campus Itajaí, Santa Catarina, Brazil. Rua Uruguai, 458, Centro. CEP: 88302-901.
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Nielsen SD, Purup S, Larsen LB. Effect of Casein Hydrolysates on Intestinal Cell Migration and Their Peptide Profiles by LC-ESI/MS/MS. Foods 2019; 8:foods8030091. [PMID: 30845637 PMCID: PMC6462906 DOI: 10.3390/foods8030091] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 02/27/2019] [Accepted: 03/02/2019] [Indexed: 12/18/2022] Open
Abstract
Potential beneficial effects of bioactive peptides derived from casein on epithelial cellular wound healing in the gastrointestinal tract were studied. Bovine casein was digested by a combination of pepsin and pancreatic proteases at different time intervals to represent ranges of duration of gastrointestinal digestion. Intestinal epithelial cells were used as an in vitro model of the small intestine. The effect of casein hydrolysates on cell migration was studied by scratch assay as a model of wound healing. Casein digested by pepsin and pancreatin for 10 to 30 min were found to have a significant stimulatory effect of >40% on cell migration relative to the control. A potential effect of casein gastrointestinal digests on gastro-intestinal wound healing has not previously been reported. The peptide profiles of active as well as inactive casein hydrolysates were characterised by liquid chromatography coupled to ion trap tandem mass spectrometry. By comparison of identified peptides in active and inactive casein hydrolysates, a pool of 11 peptides derived from casein were identified as potential candidates for effects on cell migration. Searching the milk bioactive peptide database (MBPDB) showed that 15 of the identified peptides had known biological functions such as antimicrobial, antioxidant, and immunomodulatory activity.
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Affiliation(s)
- Søren D Nielsen
- Department of Food Science, Aarhus University, Blichers Allé 20, P.O. Box 50, DK-8830 Tjele, Denmark.
| | - Stig Purup
- Department of Animal Science, Aarhus University, Blichers Allé 20, P.O. Box 50, DK-8830 Tjele, Denmark.
| | - Lotte B Larsen
- Department of Food Science, Aarhus University, Blichers Allé 20, P.O. Box 50, DK-8830 Tjele, Denmark.
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Zhuang S, Yu R, Zhong J, Liu P, Liu Z. Rhein from Rheum rhabarbarum Inhibits Hydrogen-Peroxide-Induced Oxidative Stress in Intestinal Epithelial Cells Partly through PI3K/Akt-Mediated Nrf2/HO-1 Pathways. J Agric Food Chem 2019; 67:2519-2529. [PMID: 30779558 DOI: 10.1021/acs.jafc.9b00037] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Rheum rhabarbarum has been widely used as a herbal medicine and food in China. The objective of this study was to investigate the cytoprotective action and underlying mechanisms of rhein, one active ingredient isolated from R. rhabarbarum, on H2O2-challenged rat small intestine epithelial cells (IEC-6 cells). H2O2-challenged IEC-6 cells were incubated in the pretreatment with or without rhein or LY294002, a PI3K/Akt inhibitor. The cell viability, apoptosis, intracellular reactive oxygen species (ROS), and antioxidants were measured. The expressions of heme oxygenase 1 (HO-1), nuclear factor erythroid 2-related factor (Nrf2), Akt, and p-Akt were evaluated by western blotting. Meanwhile, LY294002 was also used to investigate the role of PI3K/Akt in the rhein-induced cytoprotective role. The results showed that pretreatment of rhein could reverse the inhibition of cell viability and suppress the apoptosis, caspase-3 activity, and intracellular ROS induced by H2O2. Rhein also supported SOD activity catalase activity, glutathione S-transferase activity, and glutathione content. Furthermore, rhein induced the protein expression of HO-1 together with its upstream mediator Nrf2 and activated the phosphorylation of Akt in IEC-6 cells. LY294002 inhibited increased cell viability, upregulated the lowered apoptotic rate, and enhanced the weakened ROS levels. Although the inhibition of PI3K/Akt did not inhibit the Nrf2 nuclear level under 4 μM rhein, LY294002 inhibited the Nrf2 nuclear level under 2 μM rhein and blocked HO-1 expression. These data demonstrated that rhein protected IEC-6 cells against oxidative damage partly via PI3K/Akt and Nrf2/HO-1 pathways.
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Affiliation(s)
- Shen Zhuang
- Division of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine , China Agricultural University , 2 Yuanmingyuan West Road , Beijing 100094 , People's Republic of China
| | - Ruyang Yu
- Division of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine , China Agricultural University , 2 Yuanmingyuan West Road , Beijing 100094 , People's Republic of China
| | - Jia Zhong
- Division of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine , China Agricultural University , 2 Yuanmingyuan West Road , Beijing 100094 , People's Republic of China
| | - Ping Liu
- Division of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine , China Agricultural University , 2 Yuanmingyuan West Road , Beijing 100094 , People's Republic of China
| | - Zhongjie Liu
- Division of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine , China Agricultural University , 2 Yuanmingyuan West Road , Beijing 100094 , People's Republic of China
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Bouzenna H, Hfaiedh N, Bouaziz M, Giroux-Metges MA, Elfeki A, Talarmin H. Cytoprotective effects of essential oil of Pinus halepensis L. against aspirin-induced toxicity in IEC-6 cells. Arch Physiol Biochem 2017; 123:364-370. [PMID: 28719240 DOI: 10.1080/13813455.2017.1347689] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
CONTEXT Essential oils from Pinus species have been reported to have various therapeutic properties. OBJECTIVE This study was undertaken to identify the chemical composition and cytoprotective effects of the essential oil of Pinus halepensis L. against aspirin-induced damage in cells in vitro. MATERIAL AND METHODS The cytoprotection of the oil against toxicity of aspirin on the small intestine epithelial cells IEC-6 was tested. RESULTS The obtained results have shown that 35 different compounds were identified. Aspirin induced a decrease in cell viability, and exhibited significant damage to their morphology and an increase in superoxide dismutase (SOD) and catalase (CAT) activities. However, the co-treatment of aspirin with the essential oil of Pinus induced a significant increase in cell viability and a decrease in SOD and CAT activities. CONCLUSION Overall, these finding suggest that the essential oil of Pinus halepensis L. has potent cytoprotective effect against aspirin-induced toxicity in IEC-6 cells.
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Affiliation(s)
- Hafsia Bouzenna
- a Laboratory ORPHY EA4324, UFR Sciences et Technique , Université de Bretagne Occidentale 6 Avenue Le gorgeu , Brest , France
- b Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling , Faculty of Sciences Sfax , Gafsa , Tunisia
- c Laboratory Animal Eco Physiology , Faculty of Sciences of Gafsa , Gafsa , Tunisia
| | - Najla Hfaiedh
- b Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling , Faculty of Sciences Sfax , Gafsa , Tunisia
- c Laboratory Animal Eco Physiology , Faculty of Sciences of Gafsa , Gafsa , Tunisia
| | | | - Marie-Agnès Giroux-Metges
- a Laboratory ORPHY EA4324, UFR Sciences et Technique , Université de Bretagne Occidentale 6 Avenue Le gorgeu , Brest , France
| | - Abdelfattah Elfeki
- b Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling , Faculty of Sciences Sfax , Gafsa , Tunisia
| | - Hélène Talarmin
- a Laboratory ORPHY EA4324, UFR Sciences et Technique , Université de Bretagne Occidentale 6 Avenue Le gorgeu , Brest , France
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Bettaib J, Talarmin H, Kalai FZ, Giroux-Metges MA, Ksouri R. Limoniastrum guyonianum prevents H 2O 2-induced oxidative damage in IEC-6 cells by enhancing enzyamtic defense, reducing glutathione depletion and JNK phosphorylation. Biomed Pharmacother 2017; 95:1404-1411. [PMID: 28946188 DOI: 10.1016/j.biopha.2017.09.068] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 09/04/2017] [Accepted: 09/13/2017] [Indexed: 02/08/2023] Open
Abstract
Limoniastrum guyonianum is used in several regions of North Africa as a folk medicine. The objective of this study was to determine the in vitro antioxidant activities of L. guyonianum roots and their cytoprotective action on H2O2-challenged rat small intestine epithelial cells (IEC-6 cells). To assess the cytoprotective effect of L. guyonianum extract (LGE), IEC-6 cells were pre-incubated with different LGE concentrations. Then, IEC-6 cultures were exposed to 40μM H2O2 during 4h. Modulation of endogenous antioxidant system including SOD, CAT, MDA, GSH and the expression of possibly involved MAPKs was evaluated. Main results reported that L. guyonianum was rich in polyphenols and exhibited an important antioxidant activity as revealed by different tests (DPPH Assay, IC50=1.6μg/mL; ABTS+ test, IC50=27μg/mL; Fe-reducing power, EC50=44μg/mL). HPLC analysis showed that quercetin, catechin, and isorhamnetin-3-O-rutinoside were major phenolics. The exposure of IEC-6 cells to 40μM H2O2 during 4h resulted in oxidative stress manifested by (i) over 70% cell mortality, (ii) over-activity of CAT (246%), (iii) decrease in GSH level (10.4nmol/mg), (iv) excess in MDA content (18.4nmol/mg), and (v) a trigger of JNK phosphorylation. Pretreatment with LGE, especially at 0.25μg/mL, restored cell viability to 100%, and normal cell morphology in H2O2-chalenged cells. In addition, this extract maintained a high CAT activity, enhanced SOD capacity (120%) and increased GSH level (45.5nmol/mg). Furthermore, reducing cell death seems to be due to dephosphorylated JNK MAPK exerted by L. guyonianum bioactive compounds. In all, L. guyonianum components provided a cross-talk between regulatory pathways, implying their role as cytoprotector against oxidative stress.
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Affiliation(s)
- Jamila Bettaib
- Université de Tunis El Manar, Faculté des Sciences de Tunis, 2092 Tunis, Tunisia; Centre de Biotechnologie de Borj-Cédria, LR15CBBC06 Laboratoire des Plantes Aromatiques et Médicinales, BP 901, 2050 Hammam-Lif, Tunisia; Université de Bretagne Occidentale, Faculté de Médecine et des Sciences de la Santé, EA 4324 Laboratoire de Physiologie ORPHY, 29200 Brest, France.
| | - Hélène Talarmin
- Université de Bretagne Occidentale, Faculté de Médecine et des Sciences de la Santé, EA 4324 Laboratoire de Physiologie ORPHY, 29200 Brest, France
| | - Feten Zar Kalai
- Centre de Biotechnologie de Borj-Cédria, LR15CBBC06 Laboratoire des Plantes Aromatiques et Médicinales, BP 901, 2050 Hammam-Lif, Tunisia
| | - Marie-Agnès Giroux-Metges
- Université de Bretagne Occidentale, Faculté de Médecine et des Sciences de la Santé, EA 4324 Laboratoire de Physiologie ORPHY, 29200 Brest, France
| | - Riadh Ksouri
- Centre de Biotechnologie de Borj-Cédria, LR15CBBC06 Laboratoire des Plantes Aromatiques et Médicinales, BP 901, 2050 Hammam-Lif, Tunisia
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Bouzenna H, Hfaiedh N, Giroux-Metges MA, Elfeki A, Talarmin H. Potential protective effects of alpha-pinene against cytotoxicity caused by aspirin in the IEC-6 cells. Biomed Pharmacother 2017; 93:961-968. [PMID: 28724214 DOI: 10.1016/j.biopha.2017.06.031] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 06/04/2017] [Accepted: 06/09/2017] [Indexed: 12/12/2022] Open
Abstract
Alpha-pinene is a key compound of the essential oils extracted from many species of coniferous trees. It is known for its biological activities. The aim of the present study was to determine the preventive effect of alpha-pinene on aspirin-induced toxicity in vitro, using IEC-6 cells, and to investigate its antioxidant activities. The antioxidant activities were determined by 1,1-diphenyl-2-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP). The cytotoxicity and oxidative stress were detected by cell viability, antioxidant enzyme activity, malondialdehyde (MDA) and GSH production, and the activation of MAPK pathways. The results indicated that alpha-pinene revealed an important antioxidant activity. It was evaluated by DPPH test (EC50=310±10μg/mL) and FRAP test (EC50=238±18.92μg/mL). The co-exposure of alpha-pinene with aspirin on cells significantly increased the survival of cells and the level of GSH, and decreased the levels of MDA and total SOD and the activity of Mn-SOD. In addition, the activation of p38 and JNK was blocked by alpha-pinene. Therefore, these findings suggest that alpha-pinene can protect IEC-6 cells against aspirin-induced oxidative stress.
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Affiliation(s)
- Hafsia Bouzenna
- Laboratory ORPHY EA4324, UFR Sciences et Technique, Université de Bretagne, Occidentale 6 Avenue Le gorgeu, CS 93837, 29238 Brest Cedex 3, France; Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences of Sfax, Road Soukra km 3.5 - PB n° 1171-3000, Sfax, Tunisia; Laboratory of Animal Eco Physiology, Faculty of Sciences of Gafsa, 2112, Tunisia.
| | - Najla Hfaiedh
- Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences of Sfax, Road Soukra km 3.5 - PB n° 1171-3000, Sfax, Tunisia; Laboratory of Animal Eco Physiology, Faculty of Sciences of Gafsa, 2112, Tunisia
| | - Marie-Agnès Giroux-Metges
- Laboratory ORPHY EA4324, UFR Sciences et Technique, Université de Bretagne, Occidentale 6 Avenue Le gorgeu, CS 93837, 29238 Brest Cedex 3, France
| | - Abdelfattah Elfeki
- Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences of Sfax, Road Soukra km 3.5 - PB n° 1171-3000, Sfax, Tunisia
| | - Hélène Talarmin
- Laboratory ORPHY EA4324, UFR Sciences et Technique, Université de Bretagne, Occidentale 6 Avenue Le gorgeu, CS 93837, 29238 Brest Cedex 3, France
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Bettaib J, Talarmin H, Droguet M, Magné C, Boulaaba M, Giroux-Metges MA, Ksouri R. Tamarix gallica phenolics protect IEC-6 cells against H 2O 2 induced stress by restricting oxidative injuries and MAPKs signaling pathways. Biomed Pharmacother 2017; 89:490-8. [PMID: 28249251 DOI: 10.1016/j.biopha.2017.02.047] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 02/12/2017] [Accepted: 02/15/2017] [Indexed: 12/24/2022] Open
Abstract
Polyphenolic compounds gained interest in the pharmaceutical research area due to their beneficial properties. Herein, antioxidant and cytoprotective capacities of T. gallica extract on H2O2-challenged rat small intestine epithelial cells were investigated. To set stress conditions, IEC-6 cultures were challenged with numerous H2O2 doses and durations. Then, 40μM H2O2 during 4h were selected to assess the cytoprotective effect of different T. gallica extract concentrations. Oxidative parameters, measured through CAT and SOD activities as well as MDA quantification were assessed. In addition, the expression of possibly involved MAPKs was also valued. Main results reported that T. gallica was rich in polyphenols and exhibited an important antioxidant activity (DPPH Assay, IC50=6μgmL-1; ABTS+ test, IC50=50μgmL-1; Fe-reducing power, EC50=100μgmL-1). The exposure of IEC-6 cultures to 40μM H2O2 during 4h caused oxidative stress manifested by (i) over 70% cell mortality, (ii) over-activity of CAT (246%), (iii) excess in MDA content (18.4nmolmg-1) and (iiii) a trigger of JNK phosphorylation. Pretreatment with T. gallica extract, especially when used at 0.25μgmL-1, restored cell viability to 122%, and normal cell morphology in H2O2-chalenged cells. In addition, this extract normalized CAT activity and MDA content (100% and 14.7nmolmg-1, respectively) to their basal levels as compared to control cells. Furthermore, stopping cell death seems to be due to dephosphorylated JNK MAPK exerted by T. gallica bioactive compounds. In all, T. gallica components provided a cross-talk between regulatory pathways leading to an efficient cytoprotection against harmful oxidative stimulus.
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Bouzenna H, Hfaiedh N, Giroux-Metges MA, Elfeki A, Talarmin H. Biological properties of citral and its potential protective effects against cytotoxicity caused by aspirin in the IEC-6 cells. Biomed Pharmacother 2017; 87:653-60. [PMID: 28088731 DOI: 10.1016/j.biopha.2016.12.104] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Revised: 12/10/2016] [Accepted: 12/22/2016] [Indexed: 02/06/2023] Open
Abstract
Citral, 3,7-dimethyl-2,6-octadienal, is a key component of several essential oils extracted from lemon-scented herbal plants. The present study was designed to investigate the antioxidant activities of citral and assess its possible protective effects against aspirin-induced toxicity in vitro. We used IEC-6 cells (rat small intestine epithelial cells). The antioxidant activities were determined by 1,1-diphenyl-2-picrylhydrazyl (DPPH), β-carotene/linoleic acid and Ferric reducing antioxidant power (FRAP). Cytotoxicity was evaluated by cell viability, anti-oxidant enzyme activities, malondialdehyde (MDA) production and by the expression of MAPKs (Mitogen-Activated Protein Kinases) pathways. According to results, citral showed an important antioxidant activity. It inhibited the oxidation of linoleic acid, a moderate DPPH was found and it showed a Ferric reducing antioxidant potential with an EC50 value of 125±28.86μg/mL. Then, the co-treatment of aspirin with citral significantly decreased the aspirin-induced cell death, and the MDA level. It modulated the superoxide dismutase (SOD) and glutathione (GSH) activities. Also, the activation of MAPKs was attenuated by citral. These findings suggest that citral can protect IEC-6 cells against aspirin-induced oxidative stress that may help to discover new chemicals out of natural antioxidant substances.
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Liu X, Jiang L, Liu F, Chen Y, Xu L, Li D, Ma Y, Li H, Xu J. Effect of patchouli alcohol on the regulation of heat shock-induced oxidative stress in IEC-6 cells. Int J Hyperthermia 2016; 32:474-82. [PMID: 27056378 DOI: 10.3109/02656736.2016.1147617] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Purpose Patchouli alcohol (PA) is used to treat gastrointestinal dysfunction. The purpose of this study was to ascertain the function of PA in the regulated process of oxidative stress in rat intestinal epithelial cells (IEC-6). Materials and methods Oxidative stress was stimulated by exposing IEC-6 cells to heat shock (42 °C for 3 h). IEC-6 cells in treatment groups were pretreated with various concentrations of PA (10, 40, and 80 ng/mL) for 3 h before heat shock. Results Heat shock caused damage to the morphology of IEC-6 cells, and increased reactive oxygen species (ROS) level and malondialdehyde (MDA) content. Moreover, mRNA and protein expression by target genes related to oxidative stress in heat shock were also altered. Specifically, the mRNA expression by HSP70, HSP90, GSH-px, NRF2 nd HO-1were all increased, and Nrf2 and Keap1 protein expression were increased after heat shock. However, pretreatment with PA weakened the level of damage to the cellular morphology, and decreased the MDA content caused by heat shock, indicating PA had cytoprotective activities. Pretreatment with PA at high dose significantly increased generation of intracellular ROS. Compared with the heat shock group alone, PA pretreatment significantly decreased the mRNA expression by HSP70, HSP90, SOD, CAT, GSH-px, KEAP1 and HO-1. Furthermore, the high dose of PA significantly increased Nrf2 protein expression, while both the intermediate and high dose of PA significantly increased HO-1 protein expression. Conclusion Heat-shock-induced oxidative stress in IEC-6 cells, and PA could alleviate the Nrf2-Keap1 cellular oxidative stress responses.
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Affiliation(s)
- Xiaoxi Liu
- a China Agricultural University-Beijing University of Agriculture Traditional Chinese Veterinary Medicine (CAU-BUA TCVM) Teaching and Research Team, College of Veterinary Medicine , China Agricultural University , Beijing
| | - Linshu Jiang
- b Beijing Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology , Beijing University of Agriculture , Beijing , China
| | - Fenghua Liu
- b Beijing Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology , Beijing University of Agriculture , Beijing , China
| | - Yuping Chen
- a China Agricultural University-Beijing University of Agriculture Traditional Chinese Veterinary Medicine (CAU-BUA TCVM) Teaching and Research Team, College of Veterinary Medicine , China Agricultural University , Beijing ;,c Beijing Tong Ren Tang Hospital of Traditional Chinese Medicine , Beijing , China
| | - Lei Xu
- b Beijing Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology , Beijing University of Agriculture , Beijing , China
| | - Deyin Li
- b Beijing Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology , Beijing University of Agriculture , Beijing , China
| | - Yunfei Ma
- a China Agricultural University-Beijing University of Agriculture Traditional Chinese Veterinary Medicine (CAU-BUA TCVM) Teaching and Research Team, College of Veterinary Medicine , China Agricultural University , Beijing
| | - Huanrong Li
- b Beijing Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology , Beijing University of Agriculture , Beijing , China
| | - Jianqin Xu
- a China Agricultural University-Beijing University of Agriculture Traditional Chinese Veterinary Medicine (CAU-BUA TCVM) Teaching and Research Team, College of Veterinary Medicine , China Agricultural University , Beijing
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Xu L, He SS, Li DY, Mei C, Hou XL, Jiang LS, Liu FH. [Hydrogen peroxide induces oxidative stress and the mitochondrial pathway of apoptosis in RAT intestinal epithelial cells (IEC-6)]. Mol Biol (Mosk) 2016; 50:311-319. [PMID: 27239852 DOI: 10.7868/s0026898416020269] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Accepted: 08/18/2015] [Indexed: 06/05/2023]
Abstract
UNLABELLED In order to investigate the mechanism of apoptosis in rat intestinal epithelial cells (IEC-6) induced by hydrogen peroxide (H(2)O(2)), IEC-6 cells were subjected to 20 μmol/L H(2)O(2) and cell proliferation activity was determined using 3-(4,5-dimethyl-2-yl)-2,5-diphenyltetrazolium bromide. Cell morphology was observed by microscopy and cell apoptosis was detected by acridine orange and ethidium bromide staining and the portion of apoptotic cells was measured by flow cytometry. Genes and proteins related to cell apoptosis were detected by RT-PCR and Western blotting, and the mitochondrial membrane potential was evaluated by fluorescence probes. RESULTS Significant morphology damage was caused by exposure to H(2)O(2), and results showed that ROS generation significantly increased (P < 0.01). The activity of superoxide dismutase decreased significantly (P < 0.05), malondialdehyde content increased (P < 0.05), and expression of both catalase and glutathione peroxidase decreased significantly (P < 0.05) in the H(2)O(2) treatment group. Mitochondrion membrane potential was reduced, cytochrome released into the cytoplasm and caspase-9 and caspase-3 were significantly increased (P < 0.01) after treatment with H(2)O(2). Moreover, the ratio of Bax/Bcl-2 and apoptosis were significantly increased (P < 0.01) in the H(2)O(2) group. In conclusion, the present study indicated that the mitochondrial pathway plays a vital role in H(2)O(2) induced IEC-6 cell apoptosis.
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Affiliation(s)
- L Xu
- Beijing Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture, Beijing, 102206, P. R. China
| | - S S He
- College of Veterinary Medicine, China Agricultural University (CAU), Beijing, 100193, P. R. China
| | - D Y Li
- Beijing Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture, Beijing, 102206, P. R. China
| | - C Mei
- Beijing Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture, Beijing, 102206, P. R. China
| | - X L Hou
- Beijing Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture, Beijing, 102206, P. R. China
| | - L S Jiang
- Beijing Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture, Beijing, 102206, P. R. China
| | - F H Liu
- Beijing Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture, Beijing, 102206, P. R. China
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Kwan R, Looi KS, Omary MB. Absence of keratins 8 and 18 in rodent epithelial cell lines associates with keratin gene mutation and DNA methylation: Cell line selective effects on cell invasion. Exp Cell Res 2015; 335:12-22. [PMID: 25882495 DOI: 10.1016/j.yexcr.2015.04.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Revised: 03/02/2015] [Accepted: 04/05/2015] [Indexed: 02/07/2023]
Abstract
Epithelial-mesenchymal transition (EMT) in carcinoma is associated with dramatic up-regulation of vimentin and down-regulation of the simple-type keratins 8 and 18 (K8/K18), but the mechanisms of these changes are poorly understood. We demonstrate that two commonly-studied murine (CT26) and rat (IEC-6) intestinal cell lines have negligible K8/K18 but high vimentin protein expression. Proteasome inhibition led to a limited increase in K18 but not K8 stabilization, thereby indicating that K8/K18 absence is not due, in large part, to increased protein turnover. CT26 and IEC-6 cells had <10% of normal K8/K18 mRNA and exhibited decreased mRNA stability, with K8 mRNA levels being higher in IEC-6 versus CT26 and K18 being higher in CT26 versus IEC-6 cells. Keratin gene sequencing showed that KRT8 in CT26 cells had a 21-nucleotide deletion while K18 in IEC-6 cells had a 9-amino acid in-frame insertion. Furthermore, the KRT8 promoter in CT26 and the KRT18 promoter in IEC-6 are hypermethylated. Inhibition of DNA methylation using 5-azacytidine increased K8 or K18 in some but all the tested rodent epithelial cell lines. Restoring K8 and K18 by lentiviral transduction reduced CT26 but not IEC-6 cell matrigel invasion. K8/K18 re-introduction also decreased E-cadherin expression in IEC-6 but not CT26 cells, suggesting that the effect of keratin expression on epithelial to mesenchymal transition is cell-line dependent. Therefore, some commonly utilized rodent epithelial cell lines, unexpectedly, manifest barely detectable keratin expression but have high levels of vimentin. In the CT26 and IEC-6 intestinal cell lines, keratin expression correlates with keratin gene insertion or deletion and with promoter methylation, which likely suppress keratin transcription and mRNA or protein stability.
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Affiliation(s)
- Raymond Kwan
- Department of Molecular & Integrative Physiology, University of Michigan Medical School, 7744 Medical Science Building II, 1301 E. Catherine, Ann Arbor, MI 48109
| | - Kok Sun Looi
- Department of Molecular & Integrative Physiology, University of Michigan Medical School, 7744 Medical Science Building II, 1301 E. Catherine, Ann Arbor, MI 48109
| | - M Bishr Omary
- Department of Molecular & Integrative Physiology, University of Michigan Medical School, 7744 Medical Science Building II, 1301 E. Catherine, Ann Arbor, MI 48109.,Ann Arbor Health System VA Medical Center
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Coon SD, Rajendran VM, Schwartz JH, Singh SK. Glucose-dependent insulinotropic polypeptide-mediated signaling pathways enhance apical PepT1 expression in intestinal epithelial cells. Am J Physiol Gastrointest Liver Physiol 2015; 308:G56-62. [PMID: 25377315 PMCID: PMC4281688 DOI: 10.1152/ajpgi.00168.2014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
We have shown recently that glucose-dependent insulinotropic polypeptide (GIP), but not glucagon-like peptide 1 (GLP-1) augments H(+) peptide cotransporter (PepT1)-mediated peptide absorption in murine jejunum. While we observed that inhibiting cAMP production decreased this augmentation of PepT1 activity by GIP, it was unclear whether PKA and/or other regulators of cAMP signaling pathway(s) were involved. This study utilized tritiated glycyl-sarcosine [(3)H-glycyl-sarcosine (Gly-Sar), a relatively nonhydrolyzable dipeptide] uptake to measure PepT1 activity in CDX2-transfected IEC-6 (IEC-6/CDX2) cells, an absorptive intestinal epithelial cell model. Similar to our earlier observations with mouse jejunum, GIP but not GLP-1 augmented Gly-Sar uptake (control vs. +GIP: 154 ± 22 vs. 454 ± 39 pmol/mg protein; P < 0.001) in IEC-6/CDX2 cells. Rp-cAMP (a PKA inhibitor) and wortmannin [phosophoinositide-3-kinase (PI3K) inhibitor] pretreatment completely blocked, whereas neither calphostin C (a potent PKC inhibitor) nor BAPTA (an intracellular Ca(2+) chelator) pretreatment affected the GIP-augmented Gly-Sar uptake in IEC-6/CDX2 cells. The downstream metabolites Epac (control vs. Epac agonist: 287 ± 22 vs. 711 ± 80 pmol/mg protein) and AKT (control vs. AKT inhibitor: 720 ± 50 vs. 75 ± 19 pmol/mg protein) were shown to be involved in GIP-augmented PepT1 activity as well. Western blot analyses revealed that both GIP and Epac agonist pretreatment enhance the PepT1 expression on the apical membranes, which is completely blocked by wortmannin in IEC-6/CDX2 cells. These observations demonstrate that both cAMP and PI3K signaling pathways augment GIP-induced peptide uptake through Epac and AKT-mediated pathways in intestinal epithelial cells, respectively. In addition, these observations also indicate that both Epac and AKT-mediated signaling pathways increase apical membrane expression of PepT1 in intestinal absorptive epithelial cells.
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Affiliation(s)
- Steven D. Coon
- 1Department of Medicine, Boston University School of Medicine, Boston, Massachusetts; ,2Department of Medicine, Boston Veterans Affairs Healthcare System, Boston, Massachusetts; ,3Department of Medicine, Boston University Clinical & Translational Science Institute, Boston, Massachusetts; and
| | - Vazhaikkurichi M. Rajendran
- 4Department of Biochemistry and Molecular Biology, West Virginia University School of Medicine, Morgantown, West Virginia
| | - John H. Schwartz
- 1Department of Medicine, Boston University School of Medicine, Boston, Massachusetts;
| | - Satish K. Singh
- 1Department of Medicine, Boston University School of Medicine, Boston, Massachusetts; ,2Department of Medicine, Boston Veterans Affairs Healthcare System, Boston, Massachusetts;
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Chen J, Zhang R, Wang J, Yu P, Liu Q, Zeng D, Song H, Kuang Z. Protective effects of baicalin on LPS-induced injury in intestinal epithelial cells and intercellular tight junctions. Can J Physiol Pharmacol 2014; 93:233-7. [PMID: 25665915 DOI: 10.1139/cjpp-2014-0262] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
AIMS To investigate the protective effects and mechanisms of baicalin on lipopolysaccharide (LPS)-induced injury in intestinal epithelial cells and intercellular tight junctions. METHODS IEC-6 cells were stimulated with LPS (1.0 μg/mL), with or without baicalin, for 24 h. The levels of the inflammatory cytokines interleukin (IL)-6 and tumor necrosis factor (TNF)-α were determined using ELISA. Quantitative real-time PCR was used for determining the mRNA expression level of claudin-3, occludin, and ZO-1; Western blot and immunofluorescence analysis were used for analyzing the expression level and the distribution patterns of ZO-1 protein. RESULTS Pretreatment with baicalin (10.0 μg/mL) improved LPS-stimulated cell viability and repressed IL-6 and TNF-α levels. In addition, pretreatment with baicalin up-regulated mRNA and protein expression levels of ZO-1 and kept the protein intact in IEC-6 cells injured with LPS. CONCLUSION Baicalin has the capacity to protect IEC-6 cells and the intercellular tight junctions from LPS-induced injury. The mechanisms may be associated with inhibiting the production of inflammatory cytokines, and up-regulating the mRNA and protein expression of ZO-1.
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Affiliation(s)
- Jian Chen
- School of Basic Medical Sciences, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
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Rathor N, Zhuang R, Wang JY, Donahue JM, Turner DJ, Rao JN. Src-mediated caveolin-1 phosphorylation regulates intestinal epithelial restitution by altering Ca(2+) influx after wounding. Am J Physiol Gastrointest Liver Physiol 2014; 306:G650-8. [PMID: 24557763 PMCID: PMC3989706 DOI: 10.1152/ajpgi.00003.2014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Early mucosal restitution occurs as a consequence of intestinal epithelial cell (IEC) migration to reseal superficial wounds, but its exact mechanism remains largely unknown. Caveolin-1 (Cav1), a major component associated with caveolar lipid rafts in the plasma membrane, is implicated in many aspects of cellular functions. This study determined if c-Src kinase (Src)-induced Cav1 phosphorylation promotes intestinal epithelial restitution after wounding by activating Cav1-mediated Ca(2+) signaling. Src directly interacted with Cav1, formed Cav1-Src complexes, and phosphorylated Cav1 in IECs. Inhibition of Src activity by its chemical inhibitor PP2 or suppression of the functional caveolin scaffolding domain by caveolin-scaffolding domain peptides prevented Cav1-Src interaction, reduced Cav1 phosphorylation, decreased Ca(2+) influx, and inhibited cell migration after wounding. Disruption of caveolar lipid raft microdomains by methyl-β-cyclodextrin reduced Cav1-mediated Ca(2+) influx and repressed epithelial restitution. Moreover, Src silencing prevented subcellular redistribution of phosphorylated Cav1 in migrating IECs. These results indicate that Src-induced Cav1 phosphorylation stimulates epithelial restitution by increasing Cav1-mediated Ca(2+) signaling after wounding, thus contributing to the maintenance of gut mucosal integrity under various pathological conditions.
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Affiliation(s)
- Navneeta Rathor
- 1Department of Surgery, Cell Biology Group, University of Maryland School of Medicine, Baltimore, Maryland; ,2Baltimore Veterans Affairs Medical Center, Baltimore, Maryland; and
| | - Ran Zhuang
- 1Department of Surgery, Cell Biology Group, University of Maryland School of Medicine, Baltimore, Maryland; ,2Baltimore Veterans Affairs Medical Center, Baltimore, Maryland; and
| | - Jian-Ying Wang
- 1Department of Surgery, Cell Biology Group, University of Maryland School of Medicine, Baltimore, Maryland; ,2Baltimore Veterans Affairs Medical Center, Baltimore, Maryland; and ,3Department of Pathology, Cell Biology Group, University of Maryland School of Medicine, Baltimore, Maryland
| | - James M. Donahue
- 1Department of Surgery, Cell Biology Group, University of Maryland School of Medicine, Baltimore, Maryland; ,2Baltimore Veterans Affairs Medical Center, Baltimore, Maryland; and
| | - Douglas J. Turner
- 1Department of Surgery, Cell Biology Group, University of Maryland School of Medicine, Baltimore, Maryland; ,2Baltimore Veterans Affairs Medical Center, Baltimore, Maryland; and
| | - Jaladanki N. Rao
- 1Department of Surgery, Cell Biology Group, University of Maryland School of Medicine, Baltimore, Maryland; ,2Baltimore Veterans Affairs Medical Center, Baltimore, Maryland; and
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Wang H, Bastian SEP, Cheah KY, Lawrence A, Howarth GS. Escherichia coli Nissle 1917-derived factors reduce cell death and late apoptosis and increase transepithelial electrical resistance in a model of 5-fluorouracil-induced intestinal epithelial cell damage. Cancer Biol Ther 2014; 15:560-9. [PMID: 24556751 DOI: 10.4161/cbt.28159] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
We evaluated the capacity for supernatants (SNs) derived from Escherichia coli Nissle 1917 (EcN), cultured under different growth conditions, to prevent 5-fluorouracil (5-FU)-induced intestinal epithelial cell damage. EcN was cultured in: Luria Bertani (LB) broth, tryptone soya broth (TSB), de Man Rogosa Sharpe (MRS) broth, and M17 broth supplemented with 10% (v/v) lactose solution (M17). Intestinal epithelial cells (IEC-6) were treated with the following EcN SNs: LB(+), TSB(+), MRS(+), and M17(+) in the presence and absence of 5-FU (1.5 or 5 μM). Cell viability, apoptotic activity and cell monolayer permeability were measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT), flow cytometry, and transepithelial electrical resistance (TER) assays, respectively. 5-FU significantly reduced cell viability (P<0.05) at both 24 and 48 h. However, only EcN SN produced from LB and M17 growth media significantly decreased cell death induced by 5-FU (by approximately 10% after 24 and 48 h; and 10% after 24 h, respectively [P<0.05]). When measured by flow cytometry all EcN SNs in the presence of 5-FU increased the proportion of viable cells (by 3-5% for 24 h, 3-7% for 48 h, P<0.05) and reduced late-apoptotic cells after 24 and 48 h, compared with 5-FU control. Moreover, all EcN SNs significantly reduced the disruption of IEC-6 cell barrier function induced by 5-FU by 7-10% (P<0.05), compared with DMEM control. We conclude that EcN derived factors could potentially reduce the severity of intestinal mucositis.
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Affiliation(s)
- Hanru Wang
- School of Animal and Veterinary Sciences; University of Adelaide; Roseworthy, SA Australia
| | - Susan E P Bastian
- School of Agriculture, Food and Wine; University of Adelaide; Waite Campus; Urrbrae, SA Australia
| | - Ker Y Cheah
- Gastroenterology Department; Women's and Children's Hospital; Adelaide, SA Australia
| | - Andrew Lawrence
- Microbiology Department; SA Pathology at Women's and Children's Hospital; Adelaide, SA Australia
| | - Gordon S Howarth
- School of Animal and Veterinary Sciences; University of Adelaide; Roseworthy, SA Australia; Gastroenterology Department; Women's and Children's Hospital; Adelaide, SA Australia
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Jiang P, Smith AD, Li R, Rao JN, Liu L, Donahue JM, Wang JY, Turner DJ. Sphingosine kinase 1 overexpression stimulates intestinal epithelial cell proliferation through increased c-Myc translation. Am J Physiol Cell Physiol 2013; 304:C1187-97. [PMID: 23576579 DOI: 10.1152/ajpcell.00271.2012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sphingosine-1-phosphate (S1P), through mechanisms that are not completely understood, is shown to modulate cellular proliferation, which is critically important for maintaining the integrity of intestinal epithelium. Here, we show that increased S1P promotes proliferation in intestinal epithelial cells. We found that overexpression of sphingosine kinase 1 (SphK1), the rate-limiting enzyme for S1P synthesis, significantly increased cell proliferation and that this occurred through enhanced expression of c-Myc. Further, we found that the increased pattern of expression of c-Myc occurred predominantly due to its increased translation. The overexpressed SphK1 led to increased checkpoint kinase 2 and enhanced HuR phosphorylation which allowed for increased translation of c-Myc mRNA through HuR binding at the 3'-untranslated regions. Our findings demonstrate that S1P modulates intestinal cell proliferation and provides new insights as to the mechanistic actions of SphK1 and S1P in maintaining intestinal epithelial homeostasis.
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Affiliation(s)
- Ping Jiang
- Baltimore Veterans Affairs Medical Center, Baltimore, MD 21201, USA
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