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Campos-Bedolla P, De-La-Cruz-Negrete R, Vargas MH, Torrejón-González E, Mejía-Mendoza D, Islas-Hernández A, Segura-Medina P, Córdoba-Rodríguez G, Orozco-Suárez S, Arreola-Ramírez JL. Allergic sensitization increases contractile responses to 5-HT in guinea pig aorta. Physiol Res 2019; 69:191-197. [PMID: 31852196 DOI: 10.33549/physiolres.934128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Epidemiological and clinical studies suggest that asthma is associated with adverse cardiovascular outcomes, but its mechanism is uncertain. 5-Hydroxytryptamine (5-HT) is a mediator involved in asthma and in cardiovascular functioning. Thus, in the present study, we explored whether allergic sensitization in guinea pigs modifies 5-HT-induced contractile responses and 5-HT2A receptor expression in thoracic aorta rings. We found that sensitization produced a significant increase of 100 microM 5-HT-induced contractions of aorta rings (~27 % greater contraction than in non-sensitized animals, p<0.05). Preincubation with 10 nM ketanserin (a 5-HT2A receptor antagonist) reduced by ~30 % (p=0.003) and ~36 % (p=0.005) the area under the curve of 5-HT-induced contractions in aortas from non-sensitized and sensitized animals, respectively. There were no differences between sensitized and non-sensitized animals with respect to mRNA (qPCR) and protein (Western blot) expression of 5-HT2A receptor in thoracic aortas. We concluded that in this guinea pig model of asthma, allergic sensitization is not confined to airways, but also affects arterial contractile responses to 5-HT; changes in the expression of the 5-HT2A receptor appear not to be involved in this phenomenon.
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Affiliation(s)
- P Campos-Bedolla
- Unidad de Investigación Médica en Enfermedades Neurológicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Ciudad de México, México.
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2
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Shen J, Zhao J, Ye QY, Gu XD. Interference of miR-943-3p with secreted frizzled-related proteins4 (SFRP4) in an asthma mouse model. Cell Tissue Res 2019; 378:67-80. [PMID: 31101982 DOI: 10.1007/s00441-019-03026-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Accepted: 04/01/2019] [Indexed: 01/08/2023]
Abstract
The aim of this study is to investigate the potential roles of miR-943-3p and its target gene secreted frizzled-related proteins4 (SFRP4) in allergic asthma and elucidate its underlying mechanism, which may prompt a new clue about developing novel treatments of this disease. An allergic asthma mouse model was generated by challenging with ovalbumin (OVA); lung pathological features of mice were viewed using H&E staining; thickness of subepithelial fibrosis and smooth muscle was measured using Masson's trichrome staining. Inflammatory cells from bronchoalveolar lavage fluid (BALF) were counted based on Diff-Quik staining and morphometric analysis. Expressions of miR-943-3p, SFRP4 and Wnt signal pathway-associated proteins were detected using RT-PCR or immunoblotting, respectively. SFRP4 was downregulated in the bronchial biopsies of allergic asthma patients and represented a unique intersection between differentially expressed genes (DEGs) and genes in the Wnt signal pathway. Both miR-943-3p upregulation and SFRP4 downregulation were detected in allergic asthma patients and OVA-induced mice. Besides, OVA-induced mice possessed more inflammatory cells in BALF including macrophage (mac), eosinophil (eos), lymphocyte (lym) and neutrophil (neu), higher expression of collagen, β-catenin and c-Myc as well as thicker subepithelial fibrosis and smooth muscle in lung than control mice. In vivo delivery of miR-943-3p agomir worsened these symptoms, while both miR-943-3p antagomir and Ad-SFRP4 administration effectively alleviated this disease. Taken together, miR-943-3p accelerated the progression of airway inflammation and remodeling in allergic asthma via suppressing the activity of SFRP4 through Wnt signaling pathway in asthma patients and OVA-induced mice.
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Affiliation(s)
- Jian Shen
- Department of Pediatrics, Shuguang Hospital Affiliated to Shanghai Traditional Chinese Medical University, No. 528 Zhangheng Road, Pudong New Area, Shanghai, 201203, China.
| | - Jun Zhao
- Department of Pediatrics, Shuguang Hospital Affiliated to Shanghai Traditional Chinese Medical University, No. 528 Zhangheng Road, Pudong New Area, Shanghai, 201203, China
| | - Qing-Yan Ye
- Department of Pediatrics, Shuguang Hospital Affiliated to Shanghai Traditional Chinese Medical University, No. 528 Zhangheng Road, Pudong New Area, Shanghai, 201203, China
| | - Xi-Dong Gu
- Department of Clinical Laboratory, Shuguang Hospital Affiliated to Shanghai Traditional Chinese Medical University, Shanghai, 201203, China
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Keshavarz M, Skill M, Hollenhorst MI, Maxeiner S, Walecki M, Pfeil U, Kummer W, Krasteva-Christ G. Caveolin-3 differentially orchestrates cholinergic and serotonergic constriction of murine airways. Sci Rep 2018; 8:7508. [PMID: 29760450 PMCID: PMC5951923 DOI: 10.1038/s41598-018-25445-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 04/16/2018] [Indexed: 01/22/2023] Open
Abstract
The mechanisms of controlling airway smooth muscle (ASM) tone are of utmost clinical importance as inappropriate constriction is a hallmark in asthma and chronic obstructive pulmonary disease. Receptors for acetylcholine and serotonin, two relevant mediators in this context, appear to be incorporated in specialized, cholesterol-rich domains of the plasma membrane, termed caveolae due to their invaginated shape. The structural protein caveolin-1 partly accounts for anchoring of these receptors. We here determined the role of the other major caveolar protein, caveolin-3 (cav-3), in orchestrating cholinergic and serotonergic ASM responses, utilizing newly generated cav-3 deficient mice. Cav-3 deficiency fully abrogated serotonin-induced constriction of extrapulmonary airways in organ baths while leaving intrapulmonary airways unaffected, as assessed in precision cut lung slices. The selective expression of cav-3 in tracheal, but not intrapulmonary bronchial epithelial cells, revealed by immunohistochemistry, might explain the differential effects of cav-3 deficiency on serotonergic ASM constriction. The cholinergic response of extrapulmonary airways was not altered, whereas a considerable increase was observed in cav-3-/- intrapulmonary bronchi. Thus, cav-3 differentially organizes serotonergic and cholinergic signaling in ASM through mechanisms that are specific for airways of certain caliber and anatomical position. This may allow for selective and site-specific intervention in hyperreactive states.
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Affiliation(s)
- M Keshavarz
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - M Skill
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - M I Hollenhorst
- Institute of Anatomy and Cell Biology, School of Medicine, Saarland University, Saarbrucken, Germany
| | - S Maxeiner
- Institute of Anatomy and Cell Biology, School of Medicine, Saarland University, Saarbrucken, Germany
| | - M Walecki
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - U Pfeil
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - W Kummer
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany.,German Center for Lung Research (DZL), Marburg, Germany
| | - G Krasteva-Christ
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany. .,German Center for Lung Research (DZL), Marburg, Germany. .,Institute of Anatomy and Cell Biology, School of Medicine, Saarland University, Saarbrucken, Germany.
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4
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Keshavarz M, Schwarz H, Hartmann P, Wiegand S, Skill M, Althaus M, Kummer W, Krasteva-Christ G. Caveolin-1: Functional Insights into Its Role in Muscarine- and Serotonin-Induced Smooth Muscle Constriction in Murine Airways. Front Physiol 2017; 8:295. [PMID: 28555112 PMCID: PMC5430063 DOI: 10.3389/fphys.2017.00295] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Accepted: 04/24/2017] [Indexed: 01/12/2023] Open
Abstract
An increased bronchoconstrictor response is a hallmark in the progression of obstructive airway diseases. Acetylcholine and 5-hydroxytryptamine (5-HT, serotonin) are the major bronchoconstrictors. There is evidence that both cholinergic and serotonergic signaling in airway smooth muscle (ASM) involve caveolae. We hypothesized that caveolin-1 (cav-1), a structural protein of caveolae, plays an important regulatory role in ASM contraction. We analyzed airway contraction in different tracheal segments and extra- and intrapulmonary bronchi in cav-1 deficient (cav-1−/−) and wild-type mice using organ bath recordings and videomorphometry of methyl-beta-cyclodextrin (MCD) treated and non-treated precision-cut lung slices (PCLS). The presence of caveolae was investigated by electron microscopy. Receptor subtypes driving 5-HT-responses were studied by RT-PCR and videomorphometry after pharmacological inhibition with ketanserin. Cav-1 was present in tracheal epithelium and ASM. Muscarine induced a dose dependent contraction in all airway segments. A significantly higher Emax was observed in the caudal trachea. Although, caveolae abundancy was largely reduced in cav-1−/− mice, muscarine-induced airway contraction was maintained, albeit at diminished potency in the middle trachea, in the caudal trachea and in the bronchus without changes in the maximum efficacy. MCD-treatment of PLCS from cav-1−/− mice reduced cholinergic constriction by about 50%, indicating that cholesterol-rich plasma domains account for a substantial portion of the muscarine-induced bronchoconstriction. Notably, cav-1-deficiency fully abrogated 5-HT-induced contraction of extrapulmonary airways. In contrast, 5-HT-induced bronchoconstriction was fully maintained in cav-1-deficient intrapulmonary bronchi, but desensitization upon repetitive stimulation was enhanced. RT-PCR analysis revealed 5-HT1B, 5-HT2A, 5-HT6, and 5-HT7 receptors as the most prevalent subtypes in the airways. The 5-HT-induced-constriction in PCLS could be antagonized by ketanserin, a 5-HT2A receptor inhibitor. In conclusion, the role of cav-1, caveolae, and cholesterol-rich plasma domains in regulation of airway tone are highly agonist-specific and dependent on airway level. Cav-1 is indispensable for serotonergic contraction of extrapulmonary airways and modulates cholinergic constriction of the trachea and main bronchus. Thus, cav-1/caveolae shall be considered in settings such as bronchial hyperreactivity in common airway diseases and might provide an opportunity for modulation of the constrictor response.
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Affiliation(s)
- Maryam Keshavarz
- Institute of Anatomy and Cell Biology, Justus-Liebig-University GiessenGiessen, Germany
| | - Heike Schwarz
- Leibniz Institute for Prevention Research and Epidemiology - BIPSBremen, Germany
| | - Petra Hartmann
- Institute of Anatomy and Cell Biology, Justus-Liebig-University GiessenGiessen, Germany
| | - Silke Wiegand
- Institute of Anatomy and Cell Biology, Justus-Liebig-University GiessenGiessen, Germany
| | - Melanie Skill
- Institute of Anatomy and Cell Biology, Justus-Liebig-University GiessenGiessen, Germany
| | - Mike Althaus
- Institute of Anatomy and Cell Biology, School of Medicine, Saarland UniversityHomburg/Saar, Germany
| | - Wolfgang Kummer
- Institute of Anatomy and Cell Biology, Justus-Liebig-University GiessenGiessen, Germany.,German Center for Lung Research (DZL)Germany
| | - Gabriela Krasteva-Christ
- Institute of Anatomy and Cell Biology, School of Medicine, Saarland UniversityHomburg/Saar, Germany.,German Center for Lung Research (DZL)Germany
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Khan MA. Dynamics of airway response in lung microsections: a tool for studying airway-extra cellular matrix interactions. J Biomed Sci 2016; 23:43. [PMID: 27176036 PMCID: PMC4865010 DOI: 10.1186/s12929-016-0263-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 05/06/2016] [Indexed: 01/27/2023] Open
Abstract
The biological configuration of extracellular matrix (ECM) plays a key role in how mechanical interactions of the airway with its parenchymal attachments affect the dynamics of airway responses in different pulmonary disorders including asthma, emphysema and chronic bronchitis. It is now recognized that mechanical interactions between airway tissue and ECM play a key regulatory role on airway physiology and kinetics that can lead to the reorganization and remodeling of airway connective tissue. A connective tissue is composed of airway smooth muscle cells (ASM) and the ECM, which includes variety of glycoproteins and therefore the extent of interactions between ECM and ASM affects airway dynamics during exacerbations of major pulmonary disorders. Measurement of the velocity and magnitude of airway closure or opening provide important insights into the functions of the airway contractile apparatus and the interactions with its surrounding connective tissues. This review highlights suitability of lung microsection technique in studying measurements of airway dynamics (narrowing/opening) and associated structural distortions in airway compartments.
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Affiliation(s)
- Mohammad Afzal Khan
- Department of Comparative Medicine, King Faisal Specialist Hospital and Research Centre, MBC 03, P.O. Box 3354, Riyadh, 11211, Kingdom of Saudi Arabiana.
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Wang R, Xiao X, Cao L, Shen ZX, Lei Y, Cao YX. Airborne fine particulate matter induces an upregulation of endothelin receptors on rat bronchi. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 209:11-20. [PMID: 26618262 DOI: 10.1016/j.envpol.2015.10.043] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Accepted: 10/23/2015] [Indexed: 06/05/2023]
Abstract
Airborne fine particulate matter (PM2.5) is a risk factor for respiratory diseases. However, little is known about the effects of PM2.5 on bronchi. The present study investigated the effect of airborne PM2.5 on rat bronchi and the underlying mechanisms. Isolated rat bronchial segments were cultured for 24 h. Endothelin (ET) receptor-mediated contractile responses were recorded using a wire myograph. The mRNA and protein expression levels of ET receptors were studied using quantitative real-time PCR, Western blotting, and immunohistochemistry. The results demonstrated that ETA and ETB receptor agonists induced remarkable contractile responses on fresh and cultured bronchial segments. PM2.5 (1.0 or 3.0 μg/ml) significantly enhanced ETA and ETB receptor-mediated contractile responses in bronchi with a markedly increased maximal contraction compared to the DMSO or fresh groups. PM2.5 increased the mRNA and protein expression levels of ETA and ETB receptors. U0126 (a MEK1/2 inhibitor) and SB203580 (a p38 inhibitor) significantly suppressed PM2.5-induced increases in ETB receptor-mediated contractile responses, mRNA and protein levels. SP600125 (a JNK inhibitor) and SB203580 significantly abrogated the PM2.5-induced enhancement of ETA receptor-mediated contraction and receptor expression. In conclusion, PM2.5 upregulates ET receptors in bronchi. ETB receptor upregulation is associated with MEK1/2 and p38 pathways, and the upregulation of ETA receptor is involved in JNK and p38 pathways.
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Affiliation(s)
- Rong Wang
- Department of Pharmacology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - Xue Xiao
- Department of Pharmacology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - Lei Cao
- Department of Pharmacology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China.
| | - Zhen-xing Shen
- Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Ying Lei
- Department of Pharmacy, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Yong-xiao Cao
- Department of Pharmacology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China.
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Donovan C, Bailey SR, Tran J, Haitsma G, Ibrahim ZA, Foster SR, Tang MLK, Royce SG, Bourke JE. Rosiglitazone elicits in vitro relaxation in airways and precision cut lung slices from a mouse model of chronic allergic airways disease. Am J Physiol Lung Cell Mol Physiol 2015; 309:L1219-28. [PMID: 26386117 DOI: 10.1152/ajplung.00156.2015] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Accepted: 09/04/2015] [Indexed: 12/14/2022] Open
Abstract
Rosiglitazone (RGZ), a peroxisome proliferator-activated receptor-γ (PPARγ) ligand, is a novel dilator of small airways in mouse precision cut lung slices (PCLS). In this study, relaxation to RGZ and β-adrenoceptor agonists were compared in trachea from naïve mice and guinea pigs and trachea and PCLS from a mouse model of chronic allergic airways disease (AAD). Airways were precontracted with methacholine before addition of PPARγ ligands [RGZ, ciglitazone (CGZ), or 15-deoxy-(Δ12,14)-prostaglandin J2 (15-deoxy-PGJ2)] or β-adrenoceptor agonists (isoprenaline and salbutamol). The effects of T0070907 and GW9662 (PPARγ antagonists) or epithelial removal on relaxation were assessed. Changes in force of trachea and lumen area in PCLS were measured using preparations from saline-challenged mice and mice sensitized (days 0 and 14) and challenged with ovalbumin (3 times/wk, 6 wk). RGZ and CGZ elicited complete relaxation with greater efficacy than β-adrenoceptor agonists in mouse airways but not guinea pig trachea, while 15-deoxy-PGJ2 did not mediate bronchodilation. Relaxation to RGZ was not prevented by T0070907 or GW9662 or by epithelial removal. RGZ-induced relaxation was preserved in the trachea and increased in PCLS after ovalbumin-challenge. Although RGZ was less potent than β-adrenoceptor agonists, its effects were additive with salbutamol and isoprenaline and only RGZ maintained potency and full efficacy in maximally contracted airways or after allergen challenge. Acute PPARγ-independent, epithelial-independent airway relaxation to RGZ is resistant to functional antagonism and maintained in both trachea and PCLS from a model of chronic AAD. These novel efficacious actions of RGZ support its therapeutic potential in asthma when responsiveness to β-adrenoceptor agonists is limited.
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Affiliation(s)
- Chantal Donovan
- Biomedicine Discovery Institute and Department of Pharmacology, Monash University, Clayton, Australia; Lung Health Research Centre, Department of Pharmacology and Therapeutics, University of Melbourne, Parkville, Australia
| | - Simon R Bailey
- Faculty of Veterinary Science, University of Melbourne, Parkville, Australia; and
| | - Jenny Tran
- Lung Health Research Centre, Department of Pharmacology and Therapeutics, University of Melbourne, Parkville, Australia
| | - Gertruud Haitsma
- Lung Health Research Centre, Department of Pharmacology and Therapeutics, University of Melbourne, Parkville, Australia
| | - Zaridatul A Ibrahim
- Lung Health Research Centre, Department of Pharmacology and Therapeutics, University of Melbourne, Parkville, Australia
| | - Simon R Foster
- Lung Health Research Centre, Department of Pharmacology and Therapeutics, University of Melbourne, Parkville, Australia
| | - Mimi L K Tang
- Department of Allergy and Immunology, Murdoch Children's Research Institute, Royal Children's Hospital, Melbourne, Australia
| | - Simon G Royce
- Biomedicine Discovery Institute and Department of Pharmacology, Monash University, Clayton, Australia; Lung Health Research Centre, Department of Pharmacology and Therapeutics, University of Melbourne, Parkville, Australia; Department of Allergy and Immunology, Murdoch Children's Research Institute, Royal Children's Hospital, Melbourne, Australia
| | - Jane E Bourke
- Biomedicine Discovery Institute and Department of Pharmacology, Monash University, Clayton, Australia; Lung Health Research Centre, Department of Pharmacology and Therapeutics, University of Melbourne, Parkville, Australia;
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Gharib-Naseri MK, Saberi S, Mard SA, Latifi SM. Bronchodilatory effect of hydrogen sulfide in rat. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2012; 15:907-15. [PMID: 23493917 PMCID: PMC3586907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Accepted: 02/26/2012] [Indexed: 11/02/2022]
Abstract
OBJECTIVE(S) The aims of present study were to elucidate the effect of NaHS as a H2S donor on precontracted rat trachea smooth muscle, role of epithelium and nitric oxide in this action. MATERIALS AND METHODS Tracheal rings from male adult Wistar rats were isolated and mounted in an organ bath containing Krebs-Henseleit solution under 1.5 g resting tension and contractions were recorded isometrically. After equilibrium period (60 min), cumulative concentrations of NaHS (0.2-1.2 mM) were applied on the tracheal basal tone or on the plateau of contractions induced by KCl (60 mM) or carbachol (CCh, 0.55 μM) in the absence and presence of certain antagonists and inhibitors. RESULTS The tracheal basal tone was unaffected by NaHS but tracheal contractions induced by KCl and CCh were attenuated by NaHS in a concentration-dependent manner (P< 0.001). Removing the tracheal epithelial did not attenuate the NaHS spasmolytic effect in the tissue precontracted by KCl and CCh. The bronchodilatory effect was unaffected by tissue incubation (30 min, 1 μM) with, glibenclamide, propranolol, indomethacin, methylene blue (10 μM), and L-NAME (300 μM). CONCLUSION It seems that bronchodilatory effect of H2S was not mediated by KATP channels, β-adrenoceptors, epithelium and production of nitric oxide, cGMP and prostaglandins. Since CCh and KCl activate Ca(2+) influx and CCh promotes Ca(2+) from intracellular pool as well, therefore, we may conclude that the relaxant effect of NaHS was mediated by the Ca(2+) influx blockade and cholinergic receptors inactivation. This preliminary study shows the possible therapeutical property of H2S in obstructive pulmonary diseases.
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Affiliation(s)
- Mohammad Kazem Gharib-Naseri
- Physiology Research Centre and Department of Physiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran ,Corresponding author: Tel: +98-611-3362411; Fax: +98-611-3362411;
| | - Shadan Saberi
- Physiology Research Centre and Department of Physiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Seyyed Ali Mard
- Physiology Research Centre and Department of Physiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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Meng L, He X, Zhu W, Yang X, Jiang C, Sun Q, Raza M.B. A, Zhang S, Xue Q, Xie X, Lu S. TLR3 and TLR7 modulate IgE production in antigen induced pulmonary inflammation via influencing IL-4 expression in immune organs. PLoS One 2011; 6:e17252. [PMID: 21364926 PMCID: PMC3045401 DOI: 10.1371/journal.pone.0017252] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2010] [Accepted: 01/23/2011] [Indexed: 02/06/2023] Open
Abstract
Background Toll-like receptors (TLRs) as pattern recognition receptors, participate in both innate and adaptive immune responses, and seem to play an important role in the pathogenesis of asthma. This study aimed to identify key TLRs involved in antigen induced pulmonary inflammation (AIPI), a rat model for asthma, and to explore the role of TLRs in the disease development. Methods and Findings E3 rats were sensitized with ovalbumin (OVA)/alum intraperitoneally and intranasally challenged with OVA to induce AIPI model. TLR1-9 and cytokine mRNA expression in spleen, lung and mediastinal lymph node (mLN) tissues were screened by quantitative real-time polymerase chain reaction. TLR7 expression was found to be significantly down-regulated in spleen while TLR3 and TLR8 expression was up-regulated in mLN of AIPI rats. Furthermore, imiquimod (a ligand of TLR7) and TLR3 specific short-hairpin RNA plasmid for RNA interference were administrated, respectively, in vivo to AIPI rats to observe their effects on the disease by assessing various asthmatic parameters. The numbers of total cells, eosinophils, macrophages and lymphocytes were counted according to differential morphology in bronchoalveolar lavage fluid. Serum IgE and OVA specific IgG1 concentration was detected by enzyme-linked immunosorbent assay. The results showed that both TLR7 ligand treatment and TLR3 RNAi in vivo decreased serum IgE level and interleukin-4 mRNA expression. Conclusion/Significance TLR3 in mLN and TLR7 in spleen both systemically modulate disease development in AIPI rats via altering serum IgE concentration relevant to Th2 responses. And these findings may provide an important clue for further research in the asthma pathogenesis and suggest a new remedy for asthma treatment.
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Affiliation(s)
- Liesu Meng
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi, China
- Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University, Ministry of Education, Xi'an, Shaanxi, China
| | - Xiaojing He
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi, China
- Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University, Ministry of Education, Xi'an, Shaanxi, China
| | - Wenhua Zhu
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi, China
- Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University, Ministry of Education, Xi'an, Shaanxi, China
| | - Xudong Yang
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi, China
- Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University, Ministry of Education, Xi'an, Shaanxi, China
| | - Congshan Jiang
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi, China
- Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University, Ministry of Education, Xi'an, Shaanxi, China
| | - Qingzhu Sun
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi, China
- Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University, Ministry of Education, Xi'an, Shaanxi, China
| | - Asim Raza M.B.
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi, China
- Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University, Ministry of Education, Xi'an, Shaanxi, China
| | - Simeng Zhang
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi, China
| | - Qian Xue
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi, China
| | - Xinfang Xie
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi, China
| | - Shemin Lu
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi, China
- Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University, Ministry of Education, Xi'an, Shaanxi, China
- * E-mail:
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