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Huang AS, Tong BCK, Hung HCH, Wu AJ, Ho OKY, Kong AHY, Leung MMK, Bai J, Fu X, Yu Z, Li M, Leung TF, Mak JCW, Leung GPH, Cheung KH. Targeting calcium signaling by inositol trisphosphate receptors: A novel mechanism for the anti-asthmatic effects of Houttuynia cordata. Biomed Pharmacother 2023; 164:114935. [PMID: 37245337 DOI: 10.1016/j.biopha.2023.114935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 05/09/2023] [Accepted: 05/22/2023] [Indexed: 05/30/2023] Open
Abstract
Asthma is a chronic inflammatory disease characterized by airway hypersensitivity and remodeling. The current treatments provide only short-term benefits and may have undesirable side effects; thus, alternative or supplementary therapy is needed. Because intracellular calcium (Ca2+) signaling plays an essential role in regulating the contractility and remodeling of airway smooth muscle cells, the targeting of Ca2+ signaling is a potential therapeutic strategy for asthma. Houttuynia cordata is a traditional Chinese herb that is used to treat asthma due to its anti-allergic and anti-inflammatory properties. We hypothesized that H. cordata might modulate intracellular Ca2+ signaling and could help relieve asthmatic airway remodeling. We found that the mRNA and protein levels of inositol trisphosphate receptors (IP3Rs) were elevated in interleukin-stimulated primary human bronchial smooth muscle cells and a house dust mite-sensitized model of asthma. The upregulation of IP3R expression enhanced intracellular Ca2+ release upon stimulation and contributed to airway remodeling in asthma. Intriguingly, pretreatment with H. cordata essential oil rectified the disruption of Ca2+ signaling, mitigated asthma development, and prevented airway narrowing. Furthermore, our analysis suggested that houttuynin/2-undecanone could be the bioactive component in H. cordata essential oil because we found similar IP3R suppression in response to the commercially available derivative sodium houttuyfonate. An in silico analysis showed that houttuynin, which downregulates IP3R expression, binds to the IP3 binding domain of IP3R and may mediate a direct inhibitory effect. In summary, our findings suggest that H. cordata is a potential alternative treatment choice that may reduce asthma severity by targeting the dysregulation of Ca2+ signaling.
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Affiliation(s)
- Alexis Shiying Huang
- Teaching and Research Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region of China
| | - Benjamin Chun-Kit Tong
- Teaching and Research Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region of China
| | - Harry Chun-Hin Hung
- Teaching and Research Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region of China
| | - Aston Jiaxi Wu
- Teaching and Research Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region of China
| | - Olivia Ka-Yi Ho
- Teaching and Research Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region of China
| | - Anna Hau-Yee Kong
- Teaching and Research Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region of China
| | - Maggie Ming-Ki Leung
- Teaching and Research Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region of China
| | - Jingxuan Bai
- Teaching and Research Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region of China
| | - Xiuqiong Fu
- Teaching and Research Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region of China
| | - Zhiling Yu
- Teaching and Research Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region of China
| | - Min Li
- Teaching and Research Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region of China
| | - Ting Fan Leung
- Department of Paediatrics, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region of China
| | - Judith Choi-Wo Mak
- Department of Pharmacology and Pharmacy, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region of China
| | - George Pak-Heng Leung
- Department of Pharmacology and Pharmacy, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region of China
| | - King-Ho Cheung
- Teaching and Research Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region of China.
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Bugay V, Wallace DJ, Wang B, Salinas I, Chapparo AP, Smith HR, Dube PH, Brooks EG, Berg KA, Brenner R. Bis-Quinolinium Cyclophane Blockers of SK Potassium Channels Are Antagonists of M3 Muscarinic Acetylcholine Receptors. Front Pharmacol 2020; 11:552211. [PMID: 33041794 PMCID: PMC7525093 DOI: 10.3389/fphar.2020.552211] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 08/27/2020] [Indexed: 11/20/2022] Open
Abstract
Dequalinium is used as an antimicrobial compound for oral health and other microbial infections. Derivatives of dequalinium, the bis-quinolinium cyclophanes UCL 1684 and UCL 1848, are high affinity SK potassium channel antagonists. Here we investigated these compounds as M3 muscarinic receptor (mACHR) antagonists. We used the R-CEPIAer endoplasmic reticulum calcium reporter to functionally assay for Gq-coupled receptor signaling, and investigated the bis-quinolinium cyclophanes as antagonists of M3 mACHR activation in transfected CHO cells. Given mACHR roles in airway smooth muscle (ASM) contractility, we also tested the ability of UCL 1684 to relax ASM. We find that these compounds antagonized M3 mACHRs with an IC50 of 0.27 μM for dequalinium chloride, 1.5 μM for UCL 1684 and 1.0 μM for UCL 1848. UCL 1684 also antagonized M1 (IC50 0.12 μM) and M5 (IC50 0.52 μM) mACHR responses. UCL 1684 was determined to be a competitive antagonist at M3 receptors as it increased the EC50 for carbachol without a reduction in the maximum response. The Ki for UCL1684 determined from competition binding experiments was 909 nM. UCL 1684 reduced carbachol-evoked ASM contractions (>90%, IC50 0.43 μM), and calcium mobilization in rodent and human lung ASM cells. We conclude that dequalinium and bis-quinolinium cyclophanes antagonized M3 mACHR activation at sub- to low micromolar concentrations, with UCL 1684 acting as an ASM relaxant. Caution should be taken when using these compounds to block SK potassium channels, as inhibition of mACHRs may be a side-effect if excessive concentrations are used.
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Affiliation(s)
- Vladislav Bugay
- Cell and Integrative Physiology, UT Health San Antonio, San Antonio, TX, United States
| | - Derek J Wallace
- Intensive Care Unit, Methodist Hospital Texsan, San Antonio, TX, United States
| | - Bin Wang
- Cell and Integrative Physiology, UT Health San Antonio, San Antonio, TX, United States
| | - Irving Salinas
- Department of Physiology, Michigan State University, East Lansing, MI, United States
| | | | - Hudson Ryan Smith
- Department of Pharmacology, UT Health San Antonio, San Antonio, TX, United States
| | - Peter Herbert Dube
- Microbiology, Immunology & Molecular Genetics, UT Health San Antonio, San Antonio, TX, United States
| | - Edward G Brooks
- Department of Pediatrics, UT Health San Antonio, San Antonio, TX, United States.,Microbiology, Immunology & Molecular Genetics, UT Health San Antonio, San Antonio, TX, United States
| | - Kelly Ann Berg
- Department of Pharmacology, UT Health San Antonio, San Antonio, TX, United States
| | - Robert Brenner
- Cell and Integrative Physiology, UT Health San Antonio, San Antonio, TX, United States
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Regulation of Airway Smooth Muscle Contraction in Health and Disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1124:381-422. [PMID: 31183836 DOI: 10.1007/978-981-13-5895-1_16] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Airway smooth muscle (ASM) extends from the trachea throughout the bronchial tree to the terminal bronchioles. In utero, spontaneous phasic contraction of fetal ASM is critical for normal lung development by regulating intraluminal fluid movement, ASM differentiation, and release of key growth factors. In contrast, phasic contraction appears to be absent in the adult lung, and regulation of tonic contraction and airflow is under neuronal and humoral control. Accumulating evidence suggests that changes in ASM responsiveness contribute to the pathophysiology of lung diseases with lifelong health impacts.Functional assessments of fetal and adult ASM and airways have defined pharmacological responses and signaling pathways that drive airway contraction and relaxation. Studies using precision-cut lung slices, in which contraction of intrapulmonary airways and ASM calcium signaling can be assessed simultaneously in situ, have been particularly informative. These combined approaches have defined the relative importance of calcium entry into ASM and calcium release from intracellular stores as drivers of spontaneous phasic contraction in utero and excitation-contraction coupling.Increased contractility of ASM in asthma contributes to airway hyperresponsiveness. Studies using animal models and human ASM and airways have characterized inflammatory and other mechanisms underlying increased reactivity to contractile agonists and reduced bronchodilator efficacy of β2-adrenoceptor agonists in severe diseases. Novel bronchodilators and the application of bronchial thermoplasty to ablate increased ASM within asthmatic airways have the potential to overcome limitations of current therapies. These approaches may directly limit excessive airway contraction to improve outcomes for difficult-to-control asthma and other chronic lung diseases.
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Abstract
Mast cells (MCs) play a central role in tissue homoeostasis, sensing the local environment through numerous innate cell surface receptors. This enables them to respond rapidly to perceived tissue insults with a view to initiating a co-ordinated programme of inflammation and repair. However, when the tissue insult is chronic, the ongoing release of multiple pro-inflammatory mediators, proteases, cytokines and chemokines leads to tissue damage and remodelling. In asthma, there is strong evidence of ongoing MC activation, and their mediators and cell-cell signals are capable of regulating many facets of asthma pathophysiology. This article reviews the evidence behind this.
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Affiliation(s)
- P Bradding
- Department of Infection, Immunity and Inflammation, Institute for Lung Health, University of Leicester, Leicester, UK
| | - G Arthur
- Department of Infection, Immunity and Inflammation, Institute for Lung Health, University of Leicester, Leicester, UK
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Cheng YM, Cao AL, Zheng JP, Wang HW, Sun YS, Liu CF, Zhang BB, Wang Y, Zhu SL, Wu DZ. Airway hyperresponsiveness induced by repeated esophageal infusion of HCl in guinea pigs. Am J Respir Cell Mol Biol 2015; 51:701-8. [PMID: 24828018 DOI: 10.1165/rcmb.2013-0484oc] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Gastroesophageal reflux is a common disorder closely related to chronic airway diseases, such as chronic cough, asthma, chronic bronchitis, and chronic obstructive disease. Indeed, gastroesophageal acid reflux into the respiratory tract causes bronchoconstriction, but the underlying mechanisms have still not been clarified. This study aimed to elucidate functional changes of bronchial smooth muscles (BSMs) isolated from guinea pigs in an animal model of gastroesophageal reflux. The marked airway inflammation, hyperresponsiveness and remodeling were observed after guinea pigs were exposed to intraesophageal HCl infusion for 14 days. In addition, contractile responses to acetylcholine (ACh), KCl, electrical field stimulation, and extracellular Ca(2+) were greater in guinea pigs infused with HCl compared with control groups. The L-type voltage-dependent Ca(2+) channels (L-VDCC) blocker, nicardipine, significantly inhibited ACh- and Ca(2+)-enhanced BSM contractions in guinea pigs infused with HCl. The Rho-kinase inhibitor, Y27632, attenuated ACh-enhanced BSM contractions in guinea pigs infused with HCl. Moreover, mRNA and protein expressions for muscarinic M2 and M3 receptors, RhoA, and L-VDCC in BSM were detected by real-time PCR and Western blot. Expressions of mRNA and protein for muscarinic M3 receptors, RhoA, and L-VDCC were greater than in BSM of HCl-infused guinea pigs, whereas levels of muscarinic M2 receptors were unchanged. We demonstrate that acid infusion to the lower esophagus and, subsequently, microaspiration into the respiratory tract in guinea pigs leads to airway hyperresponsiveness and overactive BSM. Functional and molecular results indicate that overactive BSM is the reason for enhancement of extracellular Ca(2+) influx via L-VDCC and Ca(2+) sensitization through Rho-kinase signaling.
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Affiliation(s)
- Yan-Mei Cheng
- 1 Department of Gastroenterology, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China; and
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Park TJ, Kim JH, Bae JS, Park BL, Cheong HS, Pasaje CF, Park JS, Uh ST, Kim MK, Choi IS, Park CS, Shin HD. Potential association between ANXA4 polymorphisms and aspirin-exacerbated respiratory disease. ACTA ACUST UNITED AC 2012; 21:164-71. [PMID: 22847161 DOI: 10.1097/pdm.0b013e3182461d0d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Aspirin-exacerbated respiratory disease (AERD) is a clinical syndrome characterized by bronchoconstriction after ingestion of nonsteroidal anti-inflammatory drugs including aspirin. The Ca concentration in bronchial epithelial cells is an important factor for bronchoconstriction. Human annexin A4 (ANXA4) is predominantly expressed in the secretory epithelia in the lung, stomach, intestine, and kidney. Furthermore, translocation and induction of ANXA4 have been observed in human Ca-depleted neutrophils. To investigate the association between annexin A4 polymorphisms and the risk of AERD, we have genotyped 21 variants from 102 AERD subjects and 429 aspirin-tolerant asthma (ATA) controls. Logistic analyses controlling for sex, smoking status, and atopy as covariates were performed to estimate the association between the annexin A4 polymorphisms and AERD. Among these variants, 8 polymorphisms (rs2168116, rs4853017, rs6546547, rs13428251, rs7577864, rs7559354, rs7588022, and rs3816491) and 2 haplotypes (ANXA4-ht3 and ANXA4-ht5) were significantly associated with the risk of AERD. One common polymorphism in intron 11, rs3816491, showed the strongest association signal with susceptibility to aspirin-AERD even after multiple testing corrections (OR=0.57; 95% confidence interval 0.40-0.83; P=0.003; P=0.045 in the codominant model). Although further functional evaluations of replication studies in larger cohorts are required, our findings suggest that the annexin A4 could have susceptibility for AERD.
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Affiliation(s)
- Tae-Joon Park
- Department of Life Science, Sogang University, Seoul, Republic of Korea
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Kim JH, Park BL, Pasaje CFA, Kim Y, Bae JS, Park JS, Uh ST, Kim YH, Kim MK, Choi IS, Cho SH, Choi BW, Koh I, Park CS, Shin HD. Contribution of the OBSCN nonsynonymous variants to aspirin exacerbated respiratory disease susceptibility in Korean population. DNA Cell Biol 2012; 31:1001-9. [PMID: 22251166 DOI: 10.1089/dna.2011.1436] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Airway remodeling and exacerbated airway narrowing in asthma have been attributed to the regulation of intracellular Ca(2+) by sarcoplasmic reticulum (SR) of the airway smooth muscle cells. The protein encoded by obscurin, cytoskeletal calmodulin and titin-interacting RhoGEF (OBSCN) is a crucial factor in determining the SR architecture in Obscn(-/-) mice. This study genotyped a total of 55 common single-nucleotide polymorphisms (SNPs) in 592 Korean asthmatics including 163 aspirin exacerbated respiratory disease (AERD) cases and 429 aspirin-tolerant asthma (ATA) controls. Eight SNPs, including two nonsynonymous polymorphisms rs1188722C>T (Leu2116Phe) and rs1188729G>C (Cys4642Ser), and one haplotype BL2_ht1 showed statistically significant associations with AERD development (p=0.003-0.03). Two variants, rs1188722C>T (Leu2116Phe) and rs369252C>A, also revealed nominal association with FEV1 decline by aspirin provocation in asthmatics (p=0.03-0.04). Intriguingly, rs1188722C>T (Leu2116Phe) is a highly conserved amino acid residue among species, suggesting its functional relevance to AERD. In addition, the A allele of rs369252C>A, which was more prevalent in AERD than in ATA, was predicted as a potential branch point (BP) site for alternative splicing (BP score=4.29). Although further functional evaluation is required, our findings suggest that OBSCN polymorphisms, in particular, highly conserved nonsynonymous Leu2116Phe variant, might contribute to aspirin hypersensitivity in asthmatics.
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Affiliation(s)
- Jeong-Hyun Kim
- Department of Life Science, Sogang University, Seoul, Republic of Korea
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Cheng LH, Kao CH, Wang CH, Chu YH, Wang JY, Wang HW. Anti-cholinergic effect of singulair on isolated rat's tracheal smooth muscle. Eur Arch Otorhinolaryngol 2011; 269:1923-7. [PMID: 22203119 DOI: 10.1007/s00405-011-1880-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Accepted: 12/06/2011] [Indexed: 11/26/2022]
Abstract
Singulair (Montelukast) is a potent and selective leukotriene D(4) receptor antagonist, often used in treating inflammatory conditions of the respiratory system such as allergic rhinitis and asthma. However, the effects of singulair given intratracheally have rarely been well explored. To verify the effect of singulair, which acts on the tracheal smooth muscle directly in vitro. We used our preparation to test the effects of singulair on isolated rat's tracheal smooth muscle. The following assessments of singulair were performed: (1) effect on the tracheal smooth muscle resting tension, (2) effect on contraction caused by 10(-6) M methacholine as a parasympathetic mimetic, and (3) effect of the drugs on electrically induced tracheal smooth muscle contractions. The results indicated that the addition of methacholine to the incubation medium caused the trachea to contract in a dose-dependent manner. Addition of singulair at doses of 10(-5) M or above elicited a significant relaxation response to 10(-6) M methacholine-induced contraction. Singulair could not inhibit electrical field stimulation-induced spike contraction. It also had a minimal effect on the basal tension of trachea as the concentration increased. This study showed that the high concentrations of singulair also had an anti-cholinergic effect for relieving symptoms of asthma.
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Affiliation(s)
- Li-Hsiang Cheng
- Department of Otolaryngology-Head and Neck Surgery, Tri-Service General Hospital, National Defense Medical Center, No. 325, Sec. 2, Cheng-Gong Road, Neihu District, Taipei, Taiwan
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Oliveira SDDS, Silva CLM. Schistosomiasis differentially affects vasoconstrictor responses: up-regulation of 5-HT receptor-mediated aorta contraction. Mem Inst Oswaldo Cruz 2011; 106:456-60. [DOI: 10.1590/s0074-02762011000400012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Accepted: 05/03/2011] [Indexed: 11/22/2022] Open
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Sanderson MJ. Exploring lung physiology in health and disease with lung slices. Pulm Pharmacol Ther 2011; 24:452-65. [PMID: 21600999 DOI: 10.1016/j.pupt.2011.05.001] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 05/03/2011] [Accepted: 05/05/2011] [Indexed: 10/24/2022]
Abstract
The development of therapeutic approaches to treat lung disease requires an understanding of both the normal and disease physiology of the lung. Although traditional experimental approaches only address either organ or cellular physiology, the use of lung slice preparations provides a unique approach to investigate integrated physiology that links the cellular and organ responses. Living lung slices are robust and can be prepared from a variety of species, including humans, and they retain many aspects of the cellular and structural organization of the lung. Functional portions of intrapulmonary airways, arterioles and veins are present within the alveoli parenchyma. The dynamics of macroscopic changes of contraction and relaxation associated with the airways and vessels are readily observed with conventional low-magnification microscopy. The microscopic changes associated with cellular events, that determine the macroscopic responses, can be observed with confocal or two-photon microscopy. To investigate disease processes, lung slices can either be prepared from animal models of disease or animals exposed to disease invoking conditions. Alternatively, the lung slices themselves can be experimentally manipulated. Because of the ability to observe changes in cell physiology and how these responses manifest themselves at the level of the organ, lung slices have become a standard tool for the investigation of lung disease.
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Affiliation(s)
- Michael J Sanderson
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, MA 01655, USA.
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Hung YC, Wang PW, Pan TL. Functional proteomics reveal the effect of Salvia miltiorrhiza aqueous extract against vascular atherosclerotic lesions. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2010; 1804:1310-21. [DOI: 10.1016/j.bbapap.2010.02.001] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2009] [Revised: 01/15/2010] [Accepted: 02/01/2010] [Indexed: 11/29/2022]
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12
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Townsend EA, Thompson MA, Pabelick CM, Prakash YS. Rapid effects of estrogen on intracellular Ca2+ regulation in human airway smooth muscle. Am J Physiol Lung Cell Mol Physiol 2010; 298:L521-30. [PMID: 20097735 DOI: 10.1152/ajplung.00287.2009] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The severity of asthma, a disease characterized by airway hyperresponsiveness and inflammation, is enhanced in some women during the menstrual cycle and during pregnancy but relieved in others. These clinical findings suggest that sex steroids modulate airway tone. Based on well-known relaxant effects of estrogens on vascular smooth muscle, we hypothesized that estrogens relax airway smooth muscle (ASM), thus facilitating bronchodilation. In ASM tissues from female patients, Western and immunocytochemical analyses confirmed the presence of both estrogen receptor (ER) isoforms, ERalpha and ERbeta. In fura 2-loaded, dissociated ASM cells maintained in culture, acute exposure to physiological concentrations of 17beta-estradiol (E(2); 100 pM to 10 nM) decreased the intracellular Ca(2+) ([Ca(2+)](i)) response to 1 muM histamine, an effect reversed by the ER antagonist ICI-182,780. The ERalpha-selective agonist (R,R)-THC had a greater reducing effect on [Ca(2+)](i) responses to histamine and 1 muM ACh compared with the ERbeta-selective agonist (DPN). The effects of E(2) on [Ca(2+)](i) were mediated, at least in part, via decreased Ca(2+) influx through l-type channels and store-operated Ca(2+) entry but not via Ca(2+)-activated K(+) channels, receptor-operated entry, or sarcoplasmic reticulum reuptake. Overall, these data support our hypothesis that estrogens relax ASM and suggest a potentially novel therapeutic target in airway hyperresponsiveness.
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Affiliation(s)
- Elizabeth A Townsend
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota 55905, USA
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Nassar T, Yarovoi S, Fanne RA, Akkawi S, Jammal M, Allen TC, Idell S, Cines DB, Higazi AAR. Regulation of airway contractility by plasminogen activators through N-methyl-D-aspartate receptor-1. Am J Respir Cell Mol Biol 2010; 43:703-11. [PMID: 20097831 DOI: 10.1165/rcmb.2009-0257oc] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Reactive airway disease is mediated by smooth muscle contraction initiated through several agonist-dependent pathways. Activation of type 1 N-methyl-D-aspartate receptors (NMDA-R1s) by plasminogen activators (PAs) has been linked to control of vascular tone, but their effect on airway smooth muscle contractility has not previously been studied to our knowledge. We observed that NMDA-R1s are expressed by human airway smooth muscle cells and constitutively inhibit the contraction of isolated rat tracheal rings in response to acetylcholine (Ach). Both tissue-type PA (tPA) and urokinase-type PA (uPA) bind to NMDA-R1 and reverse this effect, thereby enhancing Ach-induced tracheal contractility. Tracheal contractility initiated by Ach is reduced in rings isolated from tPA(-/-) and uPA(-/-) mice compared with their wild-type counterparts. The procontractile effect of uPA or tPA was mimicked and augmented by the nitric oxide synthase inhibitor, l-NAME. uPA and tPA further enhanced the contractility of rings denuded of epithelium, an effect that was inhibited by the NMDA-R antagonist, MK-801. Binding of PAs to NMDA-R1 and the subsequent activation of the receptor were inhibited by PA inhibitor type 1, by a PA inhibitor type 1-derived hexapeptide that recognizes the tPA and uPA docking domains, as well as by specific mutations within the docking site of tPA. These studies identify involvement of PAs and NMDA-R1 in airway contractility, and define new loci that could lead to the development of novel interventions for reactive airway disease.
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Affiliation(s)
- Taher Nassar
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, 513A Stellar-Chance, 422 Curie Boulevard, Philadelphia, PA 19104, USA
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14
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Gao YD, Zou JJ, Zheng JW, Shang M, Chen X, Geng S, Yang J. Promoting effects of IL-13 on Ca2+ release and store-operated Ca2+ entry in airway smooth muscle cells. Pulm Pharmacol Ther 2010; 23:182-9. [PMID: 20045483 DOI: 10.1016/j.pupt.2009.12.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2009] [Revised: 12/10/2009] [Accepted: 12/22/2009] [Indexed: 10/20/2022]
Abstract
Th2 cytokine interleukin (IL)-13 plays a central role in the pathogenesis of allergic asthma. IL-13 exhibits a direct effect on airway smooth muscle cells (ASMCs) to cause airway hyperresponsiveness. IL-13 has been demonstrated to regulate Ca(2+) signaling in ASMCs, but the underlying mechanisms are not fully understood. Store-operated Ca(2+) entry (SOCE) plays an important role in regulating Ca(2+) signaling and cellular responses of ASMCs, whether IL-13 affects SOCE in ASMCs has not been reported. In this study, by using confocal Ca(2+) fluorescence imaging, we found that IL-13 (10 ng/ml) treatment increased basal intracellular Ca(2+) ([Ca(2+)](i)) level, Ca(2+) release and SOCE induced by SERCA inhibitor thapsigargin in rat bronchial smooth muscle cells. The glucocorticoid dexamethasone and the short-acting beta2 adrenergic agonist (beta2 agonist) salbutamol suppressed IL-13-augumented basal [Ca(2+)](i), Ca(2+) release and SOCE, whereas the long-acting beta2 agonist salmeterol had no effect on altered Ca(2+) signaling in IL-13-treated ASMCs. Membrane-permeable cAMP analog dibutyryl-cAMP (db-cAMP) similarly decreased Ca(2+) release and SOCE induced by thapsigargin in IL-13-treated ASMCs, confirmed a role of cAMP/PKA signaling pathway in the regulation of SOCE. IL-13 promoted the proliferation of ASMCs stimulated by serum; this effect was inhibited by nonspecific Ca(2+) channel blockers SKF-96365 and NiCl(2), by salmeterol, but not by salbutamol and dexamethasone. IL-13 treatment did not change the expression of SOC channel-associated molecules STIM1, Orai1 and TRPC1 at mRNA level. Our findings identified a promoting effect of IL-13 on Ca(2+) release and SOCE in ASMCs, which partially contributes to its effect on the proliferation of ASMCs; the differences of glucocorticoids and beta2 agonists in inhibiting Ca(2+) signal and proliferation potentiated by IL-13 suggest that these therapies of asthma may have distinct effect on the relief of airway contraction and remodeling in bronchial asthma.
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Affiliation(s)
- Ya-dong Gao
- Department of Respiratory Medicine, Zhongnan Hospital, Wuhan University, Wuhan 430071, PR China
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Chou YL, Wu CC, Wang HW. Effects of bambuterol and terbutaline on isolated rat's tracheal smooth muscle. Eur Arch Otorhinolaryngol 2009; 267:1305-11. [PMID: 20012638 DOI: 10.1007/s00405-009-1173-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2009] [Accepted: 11/26/2009] [Indexed: 11/30/2022]
Abstract
Terbutaline (Bricanyl) and its prodrug Bambuterol (Bambec) are highly potent beta(2)-adrenoceptor agonists often used in asthma patients. Terbutaline in the form of inhaled short-acting bronchodilator relieves asthmatic symptoms. However, the effects of bambuterol given intratracheally have rarely been explored. To verify the effect of bambuterol and terbutaline, which act on the tracheal smooth muscle directly in vitro, we used our preparation to test the effects of bambuterol on isolated rat's tracheal smooth muscle compared with terbutaline. The following assessments of bambuterol and terbutaline were performed: (1) effect on tracheal smooth muscle resting tension; (2) effect on contraction caused by 10(-6) M methacholine as a parasympathetic mimetic; (3) effect of the drugs on electrically induced tracheal smooth muscle contractions. The results indicated that adding bambuterol induced a significant further contraction to 10(-6) M methacholine-induced contraction when the preparation was increased to 10(-4) M. But terbutaline elicited a relaxation response at a dose of 10(-6) M or more. Both bambuterol and terbutaline could inhibit electrical field stimulation (EFS) induced spike contraction. Terbutaline had an anti-cholinergic effect that could relieve asthmatic symptoms. But the effect of bambuterol acting on tracheal smooth muscle directly was controversial.
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Affiliation(s)
- Ying-Liang Chou
- Department of Otolaryngology-Head and Neck Surgery, Tri-Service General Hospital, National Defense Medical Center, No. 325, Sect. 2, Cheng-Gung Road, Neihu District, 114 Taipei, Taiwan, ROC
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Bergner A, Kellner J, Tufman A, Huber RM. Endoplasmic reticulum Ca2+-homeostasis is altered in Small and non-small Cell Lung Cancer cell lines. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2009; 28:25. [PMID: 19236728 PMCID: PMC2653468 DOI: 10.1186/1756-9966-28-25] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2008] [Accepted: 02/24/2009] [Indexed: 12/03/2022]
Abstract
Background Knowledge of differences in the cellular physiology of malignant and non-malignant cells is a prerequisite for the development of cancer treatments that effectively kill cancer without damaging normal cells. Calcium is a ubiquitous signal molecule that is involved in the control of proliferation and apoptosis. We aimed to investigate if the endoplasmic reticulum (ER) Ca2+-homeostasis is different in lung cancer and normal human bronchial epithelial (NHBE) cells. Methods The intracellular Ca2+-signaling was investigated using fluorescence microscopy and the expression of Ca2+-regulating proteins was assessed using Western Blot analysis. Results In a Small Cell Lung Cancer (H1339) and an Adeno Carcinoma Lung Cancer (HCC) cell line but not in a Squamous Cell Lung Cancer (EPLC) and a Large Cell Lung Cancer (LCLC) cell line the ER Ca2+-content was reduced compared to NHBE. The reduced Ca2+-content correlated with a reduced expression of SERCA 2 pumping calcium into the ER, an increased expression of IP3R releasing calcium from the ER, and a reduced expression of calreticulin buffering calcium within the ER. Lowering the ER Ca2+-content with CPA led to increased proliferation NHBE and lung cancer cells. Conclusion The significant differences in Ca2+-homeostasis between lung cancer and NHBE cells could represent a new target for cancer treatments.
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Affiliation(s)
- Albrecht Bergner
- Division of Respiratory Medicine, Medizinische Klinik-Innenstadt, Ludwig-Maximilians-University, Munich, Germany.
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