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Allam VSRR, Faiz A, Lam M, Rathnayake SNH, Ditz B, Pouwels SD, Brandsma C, Timens W, Hiemstra PS, Tew GW, Neighbors M, Grimbaldeston M, van den Berge M, Donnelly S, Phipps S, Bourke JE, Sukkar MB. RAGE and TLR4 differentially regulate airway hyperresponsiveness: Implications for COPD. Allergy 2021; 76:1123-1135. [PMID: 32799375 DOI: 10.1111/all.14563] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 07/08/2020] [Accepted: 07/14/2020] [Indexed: 12/20/2022]
Abstract
BACKGROUND The receptor for advanced glycation end products (RAGE) and Toll-like receptor 4 (TLR4) is implicated in COPD. Although these receptors share common ligands and signalling pathways, it is not known whether they act in concert to drive pathological processes in COPD. We examined the impact of RAGE and/or TLR4 gene deficiency in a mouse model of COPD and also determined whether expression of these receptors correlates with airway neutrophilia and airway hyperresponsiveness (AHR) in COPD patients. METHODS We measured airway inflammation and AHR in wild-type, RAGE-/- , TLR4-/- and TLR4-/- RAGE-/- mice following acute exposure to cigarette smoke (CS). We also examined the impact of smoking status on AGER (encodes RAGE) and TLR4 bronchial gene expression in patients with and without COPD. Finally, we determined whether expression of these receptors correlates with airway neutrophilia and AHR in COPD patients. RESULTS RAGE-/- mice were protected against CS-induced neutrophilia and AHR. In contrast, TLR4-/- mice were not protected against CS-induced neutrophilia and had more severe CS-induced AHR. TLR4-/- RAGE-/- mice were not protected against CS-induced neutrophilia but were partially protected against CS-induced mediator release and AHR. Current smoking was associated with significantly lower AGER and TLR4 expression irrespective of COPD status, possibly reflecting negative feedback regulation. However, consistent with preclinical findings, AGER expression correlated with higher sputum neutrophil counts and more severe AHR in COPD patients. TLR4 expression did not correlate with neutrophilic inflammation or AHR. CONCLUSIONS Inhibition of RAGE but not TLR4 signalling may protect against airway neutrophilia and AHR in COPD.
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Affiliation(s)
| | - Alen Faiz
- School of Life Sciences Faculty of Science The University of Technology Sydney Ultimo NSW Australia
- Department of Pulmonary Diseases University of Groningen University Medical Center Groningen Groningen The Netherlands
- Department of Pathology and Medical Biology University of Groningen University Medical Center Groningen Groningen The Netherlands
| | - Maggie Lam
- Biomedicine Discovery Institute and Department of Pharmacology School of Biomedical Sciences Monash University Melbourne Vic. Australia
| | - Senani N. H. Rathnayake
- School of Life Sciences Faculty of Science The University of Technology Sydney Ultimo NSW Australia
| | - Benedikt Ditz
- Department of Pulmonary Diseases University of Groningen University Medical Center Groningen Groningen The Netherlands
| | - Simon D. Pouwels
- Department of Pulmonary Diseases University of Groningen University Medical Center Groningen Groningen The Netherlands
- Department of Pathology and Medical Biology University of Groningen University Medical Center Groningen Groningen The Netherlands
| | - Corry‐Anke Brandsma
- Department of Pathology and Medical Biology University of Groningen University Medical Center Groningen Groningen The Netherlands
- Groningen Research Institute for Asthma and COPD University of Groningen University Medical Center Groningen Groningen The Netherlands
| | - Wim Timens
- Department of Pathology and Medical Biology University of Groningen University Medical Center Groningen Groningen The Netherlands
- Groningen Research Institute for Asthma and COPD University of Groningen University Medical Center Groningen Groningen The Netherlands
| | - Pieter S. Hiemstra
- Department of Pulmonology Leiden University Medical Center Leiden The Netherlands
| | - Gaik W. Tew
- OMNI‐Biomarker Development, Genentech Inc South San Francisco CA USA
| | | | | | - Maarten van den Berge
- Department of Pulmonary Diseases University of Groningen University Medical Center Groningen Groningen The Netherlands
| | - Sheila Donnelly
- School of Life Sciences Faculty of Science The University of Technology Sydney Ultimo NSW Australia
| | - Simon Phipps
- QIMR Berghofer Medical Research Institute Herston Qld Australia
| | - Jane E. Bourke
- Biomedicine Discovery Institute and Department of Pharmacology School of Biomedical Sciences Monash University Melbourne Vic. Australia
| | - Maria B. Sukkar
- Graduate School of Health Faculty of Health The University of Technology Sydney Ultimo NSW Australia
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Chen M, Zhu LL, Su JL, Li GL, Wang J, Zhang YN. Prucalopride inhibits lung cancer cell proliferation, invasion, and migration through blocking of the PI3K/AKT/mTor signaling pathway. Hum Exp Toxicol 2019; 39:173-181. [PMID: 31640407 DOI: 10.1177/0960327119883409] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Lung cancer is the main cause of cancer incidence and mortality around the world. Prucalopride is an agonist for the 5-hydroxytryptamine 4 receptor, but it was unknown whether prucalopride could be used to treat lung cancer. To investigate the biological effects of prucalopride on proliferation, apoptosis, invasion, and migration of lung cancer cells, and its underlying molecular mechanism in the progression of lung cancer, we performed this study. The Cell Counting Kit 8 assay was used to measure the proliferation of A549/A427 lung cancer cells treated with prucalopride. Transwell assay was applied to evaluate cell invasion and migration. Cell apoptosis was detected by flow cytometry and Western blot analyses. The expression levels of related proteins in the PI3K/AKT/mTor signaling pathway were analyzed by Western blotting. Prucalopride inhibited the proliferation, invasion, and migration of A549/A427 human lung cancer cells. It also induced autophagy and apoptosis and decreased the expression of the phosphorylated protein kinase B (AKT) and mammalian target of rapamycin (mTor) in these cells. This study implied an inhibitory role for prucalopride in the progression of human lung cancer.
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Affiliation(s)
- M Chen
- Department of Respiratory Medicine, The Fourth Affiliated Hospital, Harbin Medical University, Harbin, Heilongjiang, People's Republic of China
| | - L-L Zhu
- Department of Respiratory Medicine, The Fourth Affiliated Hospital, Harbin Medical University, Harbin, Heilongjiang, People's Republic of China
| | - J-L Su
- Department of Geriatrics, The Second Affiliated Hospital, Harbin Medical University, Harbin, Heilongjiang, People's Republic of China
| | - G-L Li
- Department of Respiratory Medicine, The Fourth Affiliated Hospital, Harbin Medical University, Harbin, Heilongjiang, People's Republic of China
| | - J Wang
- Department of Respiratory Medicine, The Fourth Affiliated Hospital, Harbin Medical University, Harbin, Heilongjiang, People's Republic of China
| | - Y-N Zhang
- Department of Geriatrics, The Second Affiliated Hospital, Harbin Medical University, Harbin, Heilongjiang, People's Republic of China
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Kaya-Yasar Y, Karaman Y, Bozkurt TE, Onder SC, Sahin-Erdemli I. Effects of intranasal treatment with slow (GYY4137) and rapid (NaHS) donors of hydrogen sulfide in lipopolysaccharide-induced airway inflammation in mice. Pulm Pharmacol Ther 2017. [DOI: 10.1016/j.pupt.2017.06.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Wang T, Yang Z, Zhou N, Sun L, Lv Z, Wu C. Identification and functional characterisation of 5-HT4 receptor in sea cucumber Apostichopus japonicus (Selenka). Sci Rep 2017; 7:40247. [PMID: 28059140 PMCID: PMC5216381 DOI: 10.1038/srep40247] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 12/05/2016] [Indexed: 02/07/2023] Open
Abstract
Serotonin (5-HT) is an important neurotransmitter and neuromodulator that controls a variety of sensory and motor functions through 5-HT receptors (5-HTRs). The 5-HT4R subfamily is linked to Gs proteins, which activate adenylyl cyclases (ACs), and is involved in many responses in peripheral organs. In this study, the 5-HT4R from Apostichopus japonicus (Aj5-HT4R) was identified and characterised. The cloned full-length Aj5-HT4R cDNA is 1,544 bp long and contains an open reading frame 1,011 bp in length encoding 336 amino acid proteins. Bioinformatics analysis of the Aj5-HT4R protein indicated this receptor was a member of class A G protein coupled receptor (GPCR) family. Further experiments using Aj5-HT4R-transfected HEK293 cells demonstrated that treatment with 5-HT triggered a significant increase in intracellular cAMP level in a dose-dependent manner and induced a rapid internalisation of Aj5-HT4R fused with enhanced green fluorescent protein (Aj5-HT4R-EGFP) from the cell surface into the cytoplasm. In addition, the transcriptional profiles of Aj5-HT4R in aestivating A. japonicas and phosphofructokinase (AjPFK) in 5-HT administrated A. japonicus have been analysed by real-time PCR assays. Results have led to a basic understanding of Aj5-HT4R in A. japonicus, and provide a foundation for further exploration of the cell signaling and regulatory functions of this receptor.
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Affiliation(s)
- Tianming Wang
- National Engineering Research Center of Marine Facilities Aquaculture, Marine Science College, Zhejiang Ocean University, Zhoushan, Zhejiang 316022, People's Republic of China
| | - Zhen Yang
- National Engineering Research Center of Marine Facilities Aquaculture, Marine Science College, Zhejiang Ocean University, Zhoushan, Zhejiang 316022, People's Republic of China
| | - Naiming Zhou
- Institute of Biochemistry, College of LifeSciences, Zijingang Campus, Zhejiang University, Hangzhou, Zhejiang 310058, People's Republic of China
| | - Lina Sun
- Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong 266071, People's Republic of China
| | - Zhenming Lv
- National Engineering Research Center of Marine Facilities Aquaculture, Marine Science College, Zhejiang Ocean University, Zhoushan, Zhejiang 316022, People's Republic of China
| | - Changwen Wu
- National Engineering Research Center of Marine Facilities Aquaculture, Marine Science College, Zhejiang Ocean University, Zhoushan, Zhejiang 316022, People's Republic of China
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Ayaz G, Halici Z, Albayrak A, Karakus E, Cadirci E. Evaluation of 5-HT7 Receptor Trafficking on In Vivo and In Vitro Model of Lipopolysaccharide (LPS)-Induced Inflammatory Cell Injury in Rats and LPS-Treated A549 Cells. Biochem Genet 2016; 55:34-47. [PMID: 27586707 DOI: 10.1007/s10528-016-9769-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Accepted: 08/16/2016] [Indexed: 12/24/2022]
Abstract
This study aimed to investigate the effects of the 5-HT7 receptor agonist (LP44) and antagonist (SB269970) on LPS-induced in vivo tissue damage and cell culture by molecular methods. This study was conducted in two steps. For in vivo studies, 24 female rats were divided into four groups. Group I: healthy; II (2nd h): LPS 5 mg/kg administered intraperitoneally (i.p.); III (4th h): LPS 5 mg/kg administered i.p.; IV (8th h): LPS 5 mg/kg administered i.p. For in vitro studies, we used the A549 cell line. Groups: I control (healthy) (2-4 h); II LPS: 1 µg/ml E. Coli O55:B5 strain (2-4 h); III agonist (LP44) 10-9 M (2-4 h); IV antagonist (SB269970) 10-9 M (2-4 h); V LPS+agonist 10-9 M (LP44 1 µg/ml) (2-4 h); VI LPS+antagonist 10-9 M (2-4 h). In molecular analyses, we determined increased TNF-α, IL-1β, NF-κB, and 5-HT7 mRNA expressions in rat lung tissues and increased TNF-α, iNOS, and 5-HT7 mRNA expressions in the A549 cell line. In in vitro parameters, LP44 agonist administration-related decrease was observed. Our study showed that lung 5-HT7 receptor expression is increased in LPS-induced endotoxemia. All this data suggest that 5-HT7 receptor overexpression is an important protective mechanism during LPS-induced sepsis-related cell damage.
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Affiliation(s)
- Gulsen Ayaz
- Department of Pharmacology, Faculty of Medicine, Ataturk University, Campus, 25240, Erzurum, Turkey
| | - Zekai Halici
- Department of Pharmacology, Faculty of Medicine, Ataturk University, Campus, 25240, Erzurum, Turkey
| | - Abdulmecit Albayrak
- Department of Pharmacology, Faculty of Medicine, Ataturk University, Campus, 25240, Erzurum, Turkey.
| | - Emre Karakus
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Ataturk University, 25240, Erzurum, Turkey
| | - Elif Cadirci
- Department of Pharmacology, Faculty of Medicine, Ataturk University, Campus, 25240, Erzurum, Turkey
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Córdoba-Rodríguez G, Vargas MH, Ruiz V, Carbajal V, Campos-Bedolla P, Mercadillo-Herrera P, Arreola-Ramírez JL, Segura-Medina P. Allergic sensitization modifies the pulmonary expression of 5-hydroxytryptamine receptors in guinea pigs. Respir Physiol Neurobiol 2015; 223:9-15. [PMID: 26657047 DOI: 10.1016/j.resp.2015.11.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 11/24/2015] [Accepted: 11/26/2015] [Indexed: 10/22/2022]
Abstract
There is mounting evidence that 5-hydroxytryptamine (5-HT) plays a role in asthma. However, scarce information exists about the pulmonary expression of 5-HT receptors and its modification after allergic sensitization. In the present work, we explored the expression of 5-HT1A, 5-HT2A, 5-HT3, 5-HT4, 5-ht5a, 5-HT6, and 5-HT7 receptors in lungs from control and sensitized guinea pigs through qPCR and Western blot. In control animals, mRNA from all receptors was detectable in lung homogenates, especially from 5-HT2A and 5-HT4 receptors. Sensitized animals had decreased mRNA expression of 5-HT2A and 5-HT4 receptors and increased that of 5-HT7 receptor. In contrast, they had increased protein expression of 5-HT2A receptor in bronchial epithelium and of 5-HT4 receptor in lung parenchyma. The degree of airway response to the allergic challenge was inversely correlated with mRNA expression of the 5-HT1A receptor. In summary, our results showed that major 5-HT receptor subtypes are constitutively expressed in the guinea pig lung, and that allergic sensitization modifies the expression of 5-HT2A, 5-HT4, and 5-HT7 receptors.
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Affiliation(s)
- Guadalupe Córdoba-Rodríguez
- Departamento de Investigación en Hiperreactividad Bronquial, Instituto Nacional de Enfermedades Respiratorias, México DF, Mexico
| | - Mario H Vargas
- Departamento de Investigación en Hiperreactividad Bronquial, Instituto Nacional de Enfermedades Respiratorias, México DF, Mexico
| | - Víctor Ruiz
- Laboratorio de Biología Molecular, Departamento de Investigación en Fibrosis Pulmonar, Instituto Nacional de Enfermedades Respiratorias, México DF, Mexico
| | - Verónica Carbajal
- Departamento de Investigación en Hiperreactividad Bronquial, Instituto Nacional de Enfermedades Respiratorias, México DF, Mexico
| | - Patricia Campos-Bedolla
- Unidad de Investigación Médica en Enfermedades Neurológicas, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, México DF, Mexico
| | | | - José Luis Arreola-Ramírez
- Departamento de Investigación en Hiperreactividad Bronquial, Instituto Nacional de Enfermedades Respiratorias, México DF, Mexico
| | - Patricia Segura-Medina
- Departamento de Investigación en Hiperreactividad Bronquial, Instituto Nacional de Enfermedades Respiratorias, México DF, Mexico.
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Allais L, Kumar S, Debusschere K, Verschuere S, Maes T, De Smet R, Conickx G, De Vos M, Laukens D, Joos GF, Brusselle GG, Elewaut D, Cuvelier CA, Bracke KR. The Effect of Cigarette Smoke Exposure on the Development of Inflammation in Lungs, Gut and Joints of TNFΔARE Mice. PLoS One 2015; 10:e0141570. [PMID: 26523550 PMCID: PMC4629889 DOI: 10.1371/journal.pone.0141570] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 10/10/2015] [Indexed: 12/13/2022] Open
Abstract
The inflammatory cytokine TNF-α is a central mediator in many immune-mediated diseases, such as Crohn’s disease (CD), spondyloarthritis (SpA) and chronic obstructive pulmonary disease (COPD). Epidemiologic studies have shown that cigarette smoking (CS) is a prominent common risk factor in these TNF-dependent diseases. We exposed TNFΔARE mice; in which a systemic TNF-α overexpression leads to the development of inflammation; to 2 or 4 weeks of air or CS. We investigated the effect of deregulated TNF expression on CS-induced pulmonary inflammation and the effect of CS exposure on the initiation and progression of gut and joint inflammation. Upon 2 weeks of CS exposure, inflammation in lungs of TNFΔARE mice was significantly aggravated. However, upon 4 weeks of CS-exposure, this aggravation was no longer observed. TNFΔARE mice have no increases in CD4+ and CD8+ T cells and a diminished neutrophil response in the lungs after 4 weeks of CS exposure. In the gut and joints of TNFΔARE mice, 2 or 4 weeks of CS exposure did not modulate the development of inflammation. In conclusion, CS exposure does not modulate gut and joint inflammation in TNFΔARE mice. The lung responses towards CS in TNFΔARE mice however depend on the duration of CS exposure.
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Affiliation(s)
- Liesbeth Allais
- Department of Medical and Forensic Pathology, Ghent University, Ghent, Belgium
- * E-mail: ;
| | - Smitha Kumar
- Laboratory for Translational Research in Obstructive Pulmonary diseases, Department of Respiratory Medicine, Ghent University Hospital, Ghent, Belgium
| | - Karlijn Debusschere
- Laboratory for Molecular Immunology and Inflammation, Department of Rheumatology, Ghent University, Ghent, Belgium
- VIB Inflammation Research Center, Ghent University, Ghent, Belgium
| | | | - Tania Maes
- Laboratory for Translational Research in Obstructive Pulmonary diseases, Department of Respiratory Medicine, Ghent University Hospital, Ghent, Belgium
| | - Rebecca De Smet
- Department of Medical and Forensic Pathology, Ghent University, Ghent, Belgium
| | - Griet Conickx
- Laboratory for Translational Research in Obstructive Pulmonary diseases, Department of Respiratory Medicine, Ghent University Hospital, Ghent, Belgium
| | - Martine De Vos
- Department of Gastroenterology, Ghent University, Ghent, Belgium
| | - Debby Laukens
- Department of Gastroenterology, Ghent University, Ghent, Belgium
| | - Guy F. Joos
- Laboratory for Translational Research in Obstructive Pulmonary diseases, Department of Respiratory Medicine, Ghent University Hospital, Ghent, Belgium
| | - Guy G. Brusselle
- Laboratory for Translational Research in Obstructive Pulmonary diseases, Department of Respiratory Medicine, Ghent University Hospital, Ghent, Belgium
| | - Dirk Elewaut
- Laboratory for Molecular Immunology and Inflammation, Department of Rheumatology, Ghent University, Ghent, Belgium
- VIB Inflammation Research Center, Ghent University, Ghent, Belgium
| | - Claude A. Cuvelier
- Department of Medical and Forensic Pathology, Ghent University, Ghent, Belgium
| | - Ken R. Bracke
- Laboratory for Translational Research in Obstructive Pulmonary diseases, Department of Respiratory Medicine, Ghent University Hospital, Ghent, Belgium
- * E-mail: ;
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House JS, Li H, DeGraff LM, Flake G, Zeldin DC, London SJ. Genetic variation in HTR4 and lung function: GWAS follow-up in mouse. FASEB J 2014; 29:323-35. [PMID: 25342126 DOI: 10.1096/fj.14-253898] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Human genome-wide association studies (GWASs) have identified numerous associations between single nucleotide polymorphisms (SNPs) and pulmonary function. Proving that there is a causal relationship between GWAS SNPs, many of which are noncoding and without known functional impact, and these traits has been elusive. Furthermore, noncoding GWAS-identified SNPs may exert trans-regulatory effects rather than impact the proximal gene. Noncoding variants in 5-hydroxytryptamine (serotonin) receptor 4 (HTR4) are associated with pulmonary function in human GWASs. To gain insight into whether this association is causal, we tested whether Htr4-null mice have altered pulmonary function. We found that HTR4-deficient mice have 12% higher baseline lung resistance and also increased methacholine-induced airway hyperresponsiveness (AHR) as measured by lung resistance (27%), tissue resistance (48%), and tissue elastance (30%). Furthermore, Htr4-null mice were more sensitive to serotonin-induced AHR. In models of exposure to bacterial lipopolysaccharide, bleomycin, and allergic airway inflammation induced by house dust mites, pulmonary function and cytokine profiles in Htr4-null mice differed little from their wild-type controls. The findings of altered baseline lung function and increased AHR in Htr4-null mice support a causal relationship between genetic variation in HTR4 and pulmonary function identified in human GWAS.
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Affiliation(s)
- John S House
- *Division of Intramural Research, National Institute of Environmental Health Sciences, U.S. National Institutes of Health, Research Triangle Park, North Carolina, USA; and Division of the National Toxicology Program, U.S. National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Huiling Li
- *Division of Intramural Research, National Institute of Environmental Health Sciences, U.S. National Institutes of Health, Research Triangle Park, North Carolina, USA; and Division of the National Toxicology Program, U.S. National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Laura M DeGraff
- *Division of Intramural Research, National Institute of Environmental Health Sciences, U.S. National Institutes of Health, Research Triangle Park, North Carolina, USA; and Division of the National Toxicology Program, U.S. National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Gordon Flake
- *Division of Intramural Research, National Institute of Environmental Health Sciences, U.S. National Institutes of Health, Research Triangle Park, North Carolina, USA; and Division of the National Toxicology Program, U.S. National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Darryl C Zeldin
- *Division of Intramural Research, National Institute of Environmental Health Sciences, U.S. National Institutes of Health, Research Triangle Park, North Carolina, USA; and Division of the National Toxicology Program, U.S. National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Stephanie J London
- *Division of Intramural Research, National Institute of Environmental Health Sciences, U.S. National Institutes of Health, Research Triangle Park, North Carolina, USA; and Division of the National Toxicology Program, U.S. National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
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Sundar IK, Yao H, Huang Y, Lyda E, Sime PJ, Sellix MT, Rahman I. Serotonin and corticosterone rhythms in mice exposed to cigarette smoke and in patients with COPD: implication for COPD-associated neuropathogenesis. PLoS One 2014; 9:e87999. [PMID: 24520342 PMCID: PMC3919731 DOI: 10.1371/journal.pone.0087999] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Accepted: 01/03/2014] [Indexed: 12/21/2022] Open
Abstract
The circadian timing system controls daily rhythms of physiology and behavior, and disruption of clock function can trigger stressful life events. Daily exposure to cigarette smoke (CS) can lead to alteration in diverse biological and physiological processes. Smoking is associated with mood disorders, including depression and anxiety. Patients with chronic obstructive pulmonary disease (COPD) have abnormal circadian rhythms, reflected by daily changes in respiratory symptoms and lung function. Corticosterone (CORT) is an adrenal steroid that plays a considerable role in stress and anti-inflammatory responses. Serotonin (5-hydroxytryptamine; 5HT) is a neurohormone, which plays a role in sleep/wake regulation and affective disorders. Secretion of stress hormones (CORT and 5HT) is under the control of the circadian clock in the suprachiasmatic nucleus. Since smoking is a contributing factor in the development of COPD, we hypothesize that CS can affect circadian rhythms of CORT and 5HT secretion leading to sleep and mood disorders in smokers and patients with COPD. We measured the daily rhythms of plasma CORT and 5HT in mice following acute (3 d), sub-chronic (10 d) or chronic (6 mo) CS exposure and in plasma from non-smokers, smokers and patients with COPD. Acute and chronic CS exposure affected both the timing (peak phase) and amplitude of the daily rhythm of plasma CORT and 5HT in mice. Acute CS appeared to have subtle time-dependent effects on CORT levels but more pronounced effects on 5HT. As compared with CORT, plasma 5HT was slightly elevated in smokers but was reduced in patients with COPD. Thus, the effects of CS on plasma 5HT were consistent between mice and patients with COPD. Together, these data reveal a significant impact of CS exposure on rhythms of stress hormone secretion and subsequent detrimental effects on cognitive function, depression-like behavior, mood/anxiety and sleep quality in smokers and patients with COPD.
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Affiliation(s)
- Isaac K. Sundar
- Department of Environmental Medicine, Lung Biology and Disease Program, University of Rochester Medical Center, Rochester, New York, United States of America
| | - Hongwei Yao
- Department of Environmental Medicine, Lung Biology and Disease Program, University of Rochester Medical Center, Rochester, New York, United States of America
| | - Yadi Huang
- Department of Environmental Medicine, Lung Biology and Disease Program, University of Rochester Medical Center, Rochester, New York, United States of America
| | - Elizabeth Lyda
- Department of Medicine (Pulmonary), University of Rochester Medical Center, Rochester, New York, United States of America
| | - Patricia J. Sime
- Department of Medicine (Pulmonary), University of Rochester Medical Center, Rochester, New York, United States of America
| | - Michael T. Sellix
- Department of Medicine, Division of Endocrinology and Metabolism, University of Rochester Medical Center, Rochester, New York, United States of America
| | - Irfan Rahman
- Department of Environmental Medicine, Lung Biology and Disease Program, University of Rochester Medical Center, Rochester, New York, United States of America
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