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Cosme D, Soares-da-Silva P, Magro F. Effect of Toll-like receptor-2, -4, -5, -7, and NOD2 stimulation on potassium channel conductance in intestinal epithelial cells. Am J Physiol Gastrointest Liver Physiol 2022; 323:G410-G419. [PMID: 36040119 DOI: 10.1152/ajpgi.00139.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Disproportionate activation of pattern recognition receptors plays a role in inflammatory bowel disease (IBD) pathophysiology. Diarrhea is a hallmark symptom of IBD, resulting at least in part from an electrolyte imbalance that may be caused by changes in potassium channel activity. We evaluated the impact of Toll-like receptors (TLRs) and nucleotide-binding oligomerization domain 2 (NOD2) stimulation on potassium conductance of the basolateral membrane in human intestinal epithelial cells (IECs) and the role of potassium channels through electrophysiological assays under short-circuit current in Ussing chambers. TLRs and NOD2 were stimulated using specific agonists, and potassium channels were selectively blocked using triarylmethane-34 (TRAM-34), adenylyl-imidodiphosphate (AMP-PNP), and BaCl2. Potassium conductance of the basolateral membrane decreased upon activation of TLR2, TLR4, and TLR7 in T84 cells (means ± SE, -11.2 ± 4.5, -40.4 ± 7.2, and -19.4 ± 5.9, respectively) and in Caco-2 cells (-13.1 ± 5.7, -55.7 ± 7.4, and -29.1 ± 7.2, respectively). In contrast, activation of TLR5 and NOD2 increased basolateral potassium conductance, both in T84 cells (18.0 ± 4.1 and 18.4 ± 2.8, respectively) and in Caco-2 cells (21.2 ± 8.4 and 16.0 ± 3.6, respectively). TRAM-34 and AMP-PNP induced a decrease in basolateral potassium conductance upon TLR4 stimulation in both cell lines. Both KCa3.1- and Kir6-channels appear to be important mediators of this effect in IECs and could be potential targets for therapeutic agent development.NEW & NOTEWORTHY This study highlights that PRRs stimulation directly influences K+-channel conductance in IECs. TLR-2, -4, -7 stimulation decreased K+ conductance, whereas TLR5 and NOD2 stimulation had the opposite effect, leading to an increase of it instead. This study reports for the first time that KCa3.1- and Kir6-channels play a role in K+ transport pathways triggered by TLR4 stimulation. These findings suggest that KCa3.1- and Kir6-channels modulation may be a potential target for new therapeutic agents in IBD.
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Affiliation(s)
- Dina Cosme
- Unit of Pharmacology and Therapeutics, Department of Biomedicine, Faculty of Medicine, University of Porto, Porto, Portugal.,MedInUP, Center for Drug Discovery and Innovative Medicines, Porto, Portugal
| | - Patrício Soares-da-Silva
- Unit of Pharmacology and Therapeutics, Department of Biomedicine, Faculty of Medicine, University of Porto, Porto, Portugal.,MedInUP, Center for Drug Discovery and Innovative Medicines, Porto, Portugal
| | - Fernando Magro
- Unit of Pharmacology and Therapeutics, Department of Biomedicine, Faculty of Medicine, University of Porto, Porto, Portugal.,Department of Gastroenterology, São João Hospital University Centre, Porto, Portugal.,Center for Health Technology and Services Research, Porto, Portugal.,Clinical Pharmacology Unit, São João Hospital University Centre, Porto, Portugal.,Portuguese Inflammatory Bowel Disease Group, Porto, Portugal
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Li D, Wu M. Pattern recognition receptors in health and diseases. Signal Transduct Target Ther 2021; 6:291. [PMID: 34344870 PMCID: PMC8333067 DOI: 10.1038/s41392-021-00687-0] [Citation(s) in RCA: 536] [Impact Index Per Article: 178.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 05/23/2021] [Accepted: 06/22/2021] [Indexed: 02/07/2023] Open
Abstract
Pattern recognition receptors (PRRs) are a class of receptors that can directly recognize the specific molecular structures on the surface of pathogens, apoptotic host cells, and damaged senescent cells. PRRs bridge nonspecific immunity and specific immunity. Through the recognition and binding of ligands, PRRs can produce nonspecific anti-infection, antitumor, and other immunoprotective effects. Most PRRs in the innate immune system of vertebrates can be classified into the following five types based on protein domain homology: Toll-like receptors (TLRs), nucleotide oligomerization domain (NOD)-like receptors (NLRs), retinoic acid-inducible gene-I (RIG-I)-like receptors (RLRs), C-type lectin receptors (CLRs), and absent in melanoma-2 (AIM2)-like receptors (ALRs). PRRs are basically composed of ligand recognition domains, intermediate domains, and effector domains. PRRs recognize and bind their respective ligands and recruit adaptor molecules with the same structure through their effector domains, initiating downstream signaling pathways to exert effects. In recent years, the increased researches on the recognition and binding of PRRs and their ligands have greatly promoted the understanding of different PRRs signaling pathways and provided ideas for the treatment of immune-related diseases and even tumors. This review describes in detail the history, the structural characteristics, ligand recognition mechanism, the signaling pathway, the related disease, new drugs in clinical trials and clinical therapy of different types of PRRs, and discusses the significance of the research on pattern recognition mechanism for the treatment of PRR-related diseases.
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Affiliation(s)
- Danyang Li
- Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya Medical School, Central South University, Changsha, Hunan, China
- The Key Laboratory of Carcinogenesis of the Chinese Ministry of Health, The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Cancer Research Institute, Central South University, Changsha, Hunan, China
| | - Minghua Wu
- Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya Medical School, Central South University, Changsha, Hunan, China.
- The Key Laboratory of Carcinogenesis of the Chinese Ministry of Health, The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Cancer Research Institute, Central South University, Changsha, Hunan, China.
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Clauzure M, Valdivieso ÁG, Dugour AV, Mori C, Massip‐Copiz MM, Aguilar MÁ, Sotomayor V, Asensio CJA, Figueroa JM, Santa‐Coloma TA. NLR family pyrin domain containing 3 (NLRP3) and caspase 1 (CASP1) modulation by intracellular Cl - concentration. Immunology 2021; 163:493-511. [PMID: 33835494 PMCID: PMC8274155 DOI: 10.1111/imm.13336] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 03/04/2021] [Accepted: 03/31/2021] [Indexed: 12/13/2022] Open
Abstract
The impairment of the cystic fibrosis transmembrane conductance regulator (CFTR) activity induces intracellular chloride (Cl- ) accumulation. The anion Cl- , acting as a second messenger, stimulates the secretion of interleukin-1β (IL-1β), which starts an autocrine positive feedback loop. Here, we show that NLR family pyrin domain containing 3 (NLRP3) and caspase 1 (CASP1) are indirectly modulated by the intracellular Cl- concentration, showing maximal expression and activity at 75 mM Cl- , in the presence of the ionophores nigericin and tributyltin. The expression of PYD and CARD domain containing (PYCARD/ASC) remained constant from 0 to 125 mM Cl- . The CASP1 inhibitor VX-765 and the NLRP3 inflammasome inhibitor MCC950 completely blocked the Cl- -stimulated IL-1β mRNA expression and partially the IL-1β secretion. DCF fluorescence (cellular reactive oxygen species, cROS) and MitoSOX fluorescence (mitochondrial ROS, mtROS) also showed maximal ROS levels at 75 mM Cl- , a response strongly inhibited by the ROS scavenger N-acetyl-L-cysteine (NAC) or the NADPH oxidase (NOX) inhibitor GKT137831. These inhibitors also affected CASP1 and NLRP3 mRNA and protein expression. More importantly, the serum/glucocorticoid regulated kinase 1 (SGK1) inhibitor GSK650394, or its shRNAs, completely abrogated the IL-1β mRNA response to Cl- and the IL-1β secretion, interrupting the autocrine IL-1β loop. The results suggest that Cl- effects are mediated by SGK1, in which under Cl- modulation stimulates the secretion of mature IL-1β, in turn, responsible for the upregulation of ROS, CASP1, NLRP3 and IL-1β itself, through autocrine signalling.
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Affiliation(s)
- Mariángeles Clauzure
- Institute for Biomedical Research (BIOMED)Laboratory of Cellular and Molecular Biology, National Scientific and Technical Research Council (CONICET) and School of Medical SciencesPontifical Catholic University of Argentina (UCA)Buenos AiresArgentina
- Faculty of Veterinary ScienceNational University of La Pampa (UNLPam)General PicoArgentina
| | - Ángel G. Valdivieso
- Institute for Biomedical Research (BIOMED)Laboratory of Cellular and Molecular Biology, National Scientific and Technical Research Council (CONICET) and School of Medical SciencesPontifical Catholic University of Argentina (UCA)Buenos AiresArgentina
| | | | - Consuelo Mori
- Institute for Biomedical Research (BIOMED)Laboratory of Cellular and Molecular Biology, National Scientific and Technical Research Council (CONICET) and School of Medical SciencesPontifical Catholic University of Argentina (UCA)Buenos AiresArgentina
| | - María M. Massip‐Copiz
- Institute for Biomedical Research (BIOMED)Laboratory of Cellular and Molecular Biology, National Scientific and Technical Research Council (CONICET) and School of Medical SciencesPontifical Catholic University of Argentina (UCA)Buenos AiresArgentina
| | - María Á. Aguilar
- Institute for Biomedical Research (BIOMED)Laboratory of Cellular and Molecular Biology, National Scientific and Technical Research Council (CONICET) and School of Medical SciencesPontifical Catholic University of Argentina (UCA)Buenos AiresArgentina
| | - Verónica Sotomayor
- Institute for Biomedical Research (BIOMED)Laboratory of Cellular and Molecular Biology, National Scientific and Technical Research Council (CONICET) and School of Medical SciencesPontifical Catholic University of Argentina (UCA)Buenos AiresArgentina
| | - Cristian J. A. Asensio
- Institute for Biomedical Research (BIOMED)Laboratory of Cellular and Molecular Biology, National Scientific and Technical Research Council (CONICET) and School of Medical SciencesPontifical Catholic University of Argentina (UCA)Buenos AiresArgentina
| | | | - Tomás A. Santa‐Coloma
- Institute for Biomedical Research (BIOMED)Laboratory of Cellular and Molecular Biology, National Scientific and Technical Research Council (CONICET) and School of Medical SciencesPontifical Catholic University of Argentina (UCA)Buenos AiresArgentina
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Li S, Wang T, Wu B, Fu W, Xu B, Pamuru RR, Kennett M, Vanamala JKP, Reddivari L. Anthocyanin-containing purple potatoes ameliorate DSS-induced colitis in mice. J Nutr Biochem 2021; 93:108616. [PMID: 33705951 DOI: 10.1016/j.jnutbio.2021.108616] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 12/19/2020] [Accepted: 02/04/2021] [Indexed: 12/13/2022]
Abstract
Ulcerative colitis (UC), a major form of inflammatory bowel disease (IBD), is on the rise worldwide. Approximately three million people suffer from IBD in the United States alone, but the current therapeutic options (e.g., corticosteroids) come with adverse side effects including reduced ability to fight infections. Thus, there is a critical need for developing effective, safe and evidence-based food products with anti-inflammatory activity. This study evaluated the antiinflammatory potential of purple-fleshed potato using a dextran sodium sulfate (DSS) murine model of colitis. Mice were randomly assigned to control (AIN-93G diet), P15 (15% purple-fleshed potato diet) and P25 (25% purple-fleshed potato diet) groups. Colitis was induced by 2% DSS administration in drinking water for six days. The results indicated that purple-fleshed potato supplementation suppressed the DSS-induced reduction in body weight and colon length as well as the increase in spleen and liver weights. P15 and P25 diets suppressed the elevation in the intestinal permeability, colonic MPO activity, mRNA expression and protein levels of pro-inflammatory interleukins IL-6 and IL-17, the relative abundance of specific pathogenic bacteria such as Enterobacteriaceae, Escherichia coli (E. coli) and pks+ E. coli, and the increased flagellin levels induced by DSS treatment. P25 alone suppressed the elevated systemic MPO levels in DSS-exposed mice, and elevated the relative abundance of Akkermansia muciniphila (A. muciniphila) as well as attenuated colonic mRNA expression level of IL-17 and the protein levels of IL-6 and IL-1β. Therefore, the purple-fleshed potato has the potential to aid in the amelioration of UC symptoms.
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Affiliation(s)
- Shiyu Li
- Department of Food Science, Purdue University, West Lafayette, Indiana, USA
| | - Tianmin Wang
- Department of Plant Science, Penn State University, University Park, Pennsylvania, USA
| | - Binning Wu
- Department of Plant Science, Penn State University, University Park, Pennsylvania, USA
| | - Wenyi Fu
- Department of Food Science, Purdue University, West Lafayette, Indiana, USA
| | - Baojun Xu
- Food Science and Technology Program, BNU-HKBU United International College, Zhuhai, Guangdong, China
| | - Ramachandra Reddy Pamuru
- Department of Food Science, Penn State University, UniversityPark, Pennsylvania, USA; Department of Biochemistry, Yogi Vemana University, Kadapa, Andhra Pradesh, India
| | - Mary Kennett
- Department of Veterinary and Biomedical Sciences, Penn State University, University Park, Pennsylvania, USA
| | - Jairam K P Vanamala
- Department of Food Science, Penn State University, UniversityPark, Pennsylvania, USA
| | - Lavanya Reddivari
- Department of Food Science, Purdue University, West Lafayette, Indiana, USA.
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Cosme D, Estevinho MM, Rieder F, Magro F. Potassium channels in intestinal epithelial cells and their pharmacological modulation: a systematic review. Am J Physiol Cell Physiol 2020; 320:C520-C546. [PMID: 33326312 DOI: 10.1152/ajpcell.00393.2020] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Several potassium channels (KCs) have been described throughout the gastrointestinal tract. Notwithstanding, their contribution to both physiologic and pathophysiologic conditions, as inflammatory bowel disease (IBD), remains underexplored. Therefore, we aim to systematically review, for the first time, the evidence on the characteristics and modulation of KCs in intestinal epithelial cells (IECs). PubMed, Scopus, and Web of Science were searched to identify studies focusing on KCs and their modulation in IECs. The included studies were assessed using a reporting inclusiveness checklist. From the 745 identified records, 73 met the inclusion criteria; their reporting inclusiveness was moderate-high. Some studies described the physiological role of KCs, while others explored their importance in pathological settings. Globally, in IBD animal models, apical KCa1.1 channels, responsible for luminal secretion, were upregulated. In human colonocytes, basolateral KCa3.1 channels were downregulated. The pharmacological inhibition of K2P and Kv influenced intestinal barrier function, promoting inflammation. Evidence suggests a strong association between KCs expression and secretory mechanisms in human and animal IECs. Further research is warranted to explore the usefulness of KC pharmacological modulation as a therapeutic target.
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Affiliation(s)
- Dina Cosme
- Department of Biomedicine, Unit of Pharmacology and Therapeutics, Faculty of Medicine, University of Porto, Porto, Portugal.,MedInUP, Center for Drug Discovery and Innovative Medicines, Porto, Portugal
| | - Maria Manuela Estevinho
- Department of Biomedicine, Unit of Pharmacology and Therapeutics, Faculty of Medicine, University of Porto, Porto, Portugal.,Department of Gastroenterology, Centro Hospitalar Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal
| | - Florian Rieder
- Department of Gastroenterology, Hepatology and Nutrition, Digestive Diseases, and Surgery Institute, Cleveland Clinic Foundation, Cleveland, Ohio.,Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio
| | - Fernando Magro
- Department of Biomedicine, Unit of Pharmacology and Therapeutics, Faculty of Medicine, University of Porto, Porto, Portugal.,MedInUP, Center for Drug Discovery and Innovative Medicines, Porto, Portugal.,Department of Gastroenterology, Centro Hospitalar São João, Porto, Portugal
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6
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General principles of developing novel radioprotective agents for nuclear emergency. RADIATION MEDICINE AND PROTECTION 2020. [DOI: 10.1016/j.radmp.2020.08.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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Zheng YX, Ma LZ, Liu SJ, Zhang CT, Meng R, Chen YZ, Jiang ZL. Protective effects of trehalose on frozen-thawed ovarian granulosa cells of cattle. Anim Reprod Sci 2018; 200:14-21. [PMID: 30472065 DOI: 10.1016/j.anireprosci.2018.11.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Revised: 11/09/2018] [Accepted: 11/13/2018] [Indexed: 01/07/2023]
Abstract
In this study, trehalose was investigated for its cryoprotective effects on ovarian granulosa cells (bGCs) of cattle. Five concentrations of trehalose at 0, 0.2, 0.4, 0.6 and 0.8 mol/L were added to the cryopreservation medium of bGCs, and the effects on the quality of frozen-thawed bGCs were assessed. The results indicate that the use of cryopreservation medium containing 0.2 and 0.4 mol/L of trehalose resulted in a greater rate of bGC viability compared to those of other groups (P<0.05). Culturing with trehalose at 0.2 and 0.4 mol/L increased 17β- estradiol (E2)and decreased progesterone (P4)production (P < 0.05) in post-thawed bGCs. Compared with the control group, the intracellular Ca2+ concentrations of frozen-thawed bGCs were less in all treatment groups (P<0.05), and the least Ca2+ concentration was observed in the group containing 0.4 mol/L trehalose. The plasma membrane potentials of frozen-thawed bGCs were greater in the groups with 0.2 and 0.4 mol/L trehalose, and the group treated with 0.4 mol/L trehalose had the greatest membrane potential in comparison to other groups (P < 0.05). The relative abundance of the CYP19 mRNA in frozen-thawed bGCs was greater in the groups containing 0.2, 0.4 and 0.6 mol/L trehalose, and relative abundances of FSHR and BCL2 mRNA were greater in the group of bGCs treated with 0.2 mol/L trehalose (P<0.05). Trehalose treatment at 0.4, 0.6 and 0.8 mol/L had an inhibitory effect on BAX gene transcription in frozen-thawed bGCs (P<0.05). In summary, trehalose exhibited a greater cryoprotective effect on bGCs than basic cryopreservation medium.
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Affiliation(s)
- Y X Zheng
- College of Animal Science and Technology, Northwest A & F University, Yangling, Shaanxi 712100, China
| | - L Z Ma
- College of Animal Science and Technology, Northwest A & F University, Yangling, Shaanxi 712100, China
| | - S J Liu
- State Key Laboratory of Plateau Ecology and Agriculture, Key Laboratory of Plateau Grazing Animal Nutrition and Feed Science of Qinghai Province, Qinghai Plateau Yak Research Center, Qinhai University, Xining, Qinghai 810016, China
| | - C T Zhang
- Xining Animal Husbandry and Veterinary Station, Xining, Qinghai 810003, China
| | - R Meng
- Xining Animal Husbandry and Veterinary Station, Xining, Qinghai 810003, China
| | - Y Z Chen
- Xining Animal Husbandry and Veterinary Station, Xining, Qinghai 810003, China
| | - Z L Jiang
- College of Animal Science and Technology, Northwest A & F University, Yangling, Shaanxi 712100, China.
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Luo S, Deng X, Liu Q, Pan Z, Zhao Z, Zhou L, Luo X. Emodin ameliorates ulcerative colitis by the flagellin-TLR5 dependent pathway in mice. Int Immunopharmacol 2018; 59:269-275. [DOI: 10.1016/j.intimp.2018.04.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2017] [Revised: 04/03/2018] [Accepted: 04/05/2018] [Indexed: 11/30/2022]
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