Serveur d'exploration Chloroquine

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Autophagy Activation in Asthma Airways Remodeling.

Identifieur interne : 000A48 ( Main/Exploration ); précédent : 000A47; suivant : 000A49

Autophagy Activation in Asthma Airways Remodeling.

Auteurs : Kielan D. Mcalinden ; Deepak A. Deshpande [États-Unis] ; Saeid Ghavami [Canada] ; Dia Xenaki [Australie] ; Sukhwinder Singh Sohal [Australie] ; Brian G. Oliver [Australie] ; Mehra Haghi ; Pawan Sharma [Australie]

Source :

RBID : pubmed:30383396

Descripteurs français

English descriptors

Abstract

Current asthma therapies fail to target airway remodeling that correlates with asthma severity driving disease progression that ultimately leads to loss of lung function. Macroautophagy (hereinafter "autophagy") is a fundamental cell-recycling mechanism in all eukaryotic cells; emerging evidence suggests that it is dysregulated in asthma. We investigated the interrelationship between autophagy and airway remodeling and assessed preclinical efficacy of a known autophagy inhibitor in murine models of asthma. Human asthmatic and nonasthmatic lung tissues were histologically evaluated and were immunostained for key autophagy markers. The percentage area of positive staining was quantified in the epithelium and airway smooth muscle bundles using ImageJ software. Furthermore, the autophagy inhibitor chloroquine was tested intranasally in prophylactic (3 wk) and treatment (5 wk) models of allergic asthma in mice. Human asthmatic tissues showed greater tissue inflammation and demonstrated hallmark features of airway remodeling, displaying thickened epithelium (P < 0.001) and reticular basement membrane (P < 0.0001), greater lamina propria depth (P < 0.005), and increased airway smooth muscle bundles (P < 0.001) with higher expression of Beclin-1 (P < 0.01) and ATG5 (autophagy-related gene 5) (P < 0.05) together with reduced p62 (P < 0.05) compared with nonasthmatic control tissues. Beclin-1 expression was significantly higher in asthmatic epithelium and ciliated cells (P < 0.05), suggesting a potential role of ciliophagy in asthma. Murine asthma models demonstrated effective preclinical efficacy (reduced key features of allergic asthma: airway inflammation, airway hyperresponsiveness, and airway remodeling) of the autophagy inhibitor chloroquine. Our data demonstrate cell context-dependent and selective activation of autophagy in structural cells in asthma. Furthermore, this pathway can be effectively targeted to ameliorate airway remodeling in asthma.

DOI: 10.1165/rcmb.2018-0169OC
PubMed: 30383396


Affiliations:


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Le document en format XML

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<term>Aged, 80 and over</term>
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<term>Animals</term>
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<term>Asthma (drug therapy)</term>
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<term>Myocytes du muscle lisse (anatomopathologie)</term>
<term>Myocytes du muscle lisse (métabolisme)</term>
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<term>Poumon (métabolisme)</term>
<term>Protéine-5 associée à l'autophagie (antagonistes et inhibiteurs)</term>
<term>Protéine-5 associée à l'autophagie (génétique)</term>
<term>Protéine-5 associée à l'autophagie (métabolisme)</term>
<term>Remodelage des voies aériennes ()</term>
<term>Régulation de l'expression des gènes</term>
<term>Souris</term>
<term>Souris de lignée BALB C</term>
<term>Sujet âgé</term>
<term>Sujet âgé de 80 ans ou plus</term>
<term>Séquestosome-1 (génétique)</term>
<term>Séquestosome-1 (métabolisme)</term>
<term>Transduction du signal</term>
<term>Études cas-témoins</term>
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<term>Chloroquine</term>
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<term>Cils vibratiles</term>
<term>Muqueuse respiratoire</term>
<term>Muscles lisses</term>
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<term>Protéine-5 associée à l'autophagie</term>
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<term>Airway Remodeling</term>
<term>Autophagy</term>
<term>Cilia</term>
<term>Lung</term>
<term>Muscle, Smooth</term>
<term>Myocytes, Smooth Muscle</term>
<term>Respiratory Mucosa</term>
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<keywords scheme="MESH" qualifier="drug therapy" xml:lang="en">
<term>Asthma</term>
</keywords>
<keywords scheme="MESH" qualifier="genetics" xml:lang="en">
<term>Asthma</term>
<term>Autophagy</term>
</keywords>
<keywords scheme="MESH" qualifier="génétique" xml:lang="fr">
<term>Asthme</term>
<term>Autophagie</term>
<term>Bécline-1</term>
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<term>Séquestosome-1</term>
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<term>Cilia</term>
<term>Lung</term>
<term>Muscle, Smooth</term>
<term>Myocytes, Smooth Muscle</term>
<term>Respiratory Mucosa</term>
</keywords>
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<term>Asthme</term>
<term>Bécline-1</term>
<term>Cils vibratiles</term>
<term>Muqueuse respiratoire</term>
<term>Muscles lisses</term>
<term>Myocytes du muscle lisse</term>
<term>Poumon</term>
<term>Protéine-5 associée à l'autophagie</term>
<term>Séquestosome-1</term>
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<term>Asthma</term>
<term>Cilia</term>
<term>Lung</term>
<term>Muscle, Smooth</term>
<term>Myocytes, Smooth Muscle</term>
<term>Respiratory Mucosa</term>
</keywords>
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<term>Chloroquine</term>
</keywords>
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<term>Asthme</term>
</keywords>
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<term>Adolescent</term>
<term>Adult</term>
<term>Aged</term>
<term>Aged, 80 and over</term>
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<term>Case-Control Studies</term>
<term>Disease Models, Animal</term>
<term>Female</term>
<term>Gene Expression Regulation</term>
<term>Humans</term>
<term>Male</term>
<term>Mice</term>
<term>Mice, Inbred BALB C</term>
<term>Middle Aged</term>
<term>Primary Cell Culture</term>
<term>Signal Transduction</term>
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<term>Adolescent</term>
<term>Adulte</term>
<term>Adulte d'âge moyen</term>
<term>Animaux</term>
<term>Autophagie</term>
<term>Cils vibratiles</term>
<term>Culture primaire de cellules</term>
<term>Femelle</term>
<term>Humains</term>
<term>Modèles animaux de maladie humaine</term>
<term>Muqueuse respiratoire</term>
<term>Muscles lisses</term>
<term>Myocytes du muscle lisse</term>
<term>Mâle</term>
<term>Poumon</term>
<term>Remodelage des voies aériennes</term>
<term>Régulation de l'expression des gènes</term>
<term>Souris</term>
<term>Souris de lignée BALB C</term>
<term>Sujet âgé</term>
<term>Sujet âgé de 80 ans ou plus</term>
<term>Transduction du signal</term>
<term>Études cas-témoins</term>
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<front>
<div type="abstract" xml:lang="en">Current asthma therapies fail to target airway remodeling that correlates with asthma severity driving disease progression that ultimately leads to loss of lung function. Macroautophagy (hereinafter "autophagy") is a fundamental cell-recycling mechanism in all eukaryotic cells; emerging evidence suggests that it is dysregulated in asthma. We investigated the interrelationship between autophagy and airway remodeling and assessed preclinical efficacy of a known autophagy inhibitor in murine models of asthma. Human asthmatic and nonasthmatic lung tissues were histologically evaluated and were immunostained for key autophagy markers. The percentage area of positive staining was quantified in the epithelium and airway smooth muscle bundles using ImageJ software. Furthermore, the autophagy inhibitor chloroquine was tested intranasally in prophylactic (3 wk) and treatment (5 wk) models of allergic asthma in mice. Human asthmatic tissues showed greater tissue inflammation and demonstrated hallmark features of airway remodeling, displaying thickened epithelium (
<i>P</i>
 < 0.001) and reticular basement membrane (
<i>P</i>
 < 0.0001), greater lamina propria depth (
<i>P</i>
 < 0.005), and increased airway smooth muscle bundles (
<i>P</i>
 < 0.001) with higher expression of Beclin-1 (
<i>P</i>
 < 0.01) and ATG5 (autophagy-related gene 5) (
<i>P</i>
 < 0.05) together with reduced p62 (
<i>P</i>
 < 0.05) compared with nonasthmatic control tissues. Beclin-1 expression was significantly higher in asthmatic epithelium and ciliated cells (
<i>P</i>
 < 0.05), suggesting a potential role of ciliophagy in asthma. Murine asthma models demonstrated effective preclinical efficacy (reduced key features of allergic asthma: airway inflammation, airway hyperresponsiveness, and airway remodeling) of the autophagy inhibitor chloroquine. Our data demonstrate cell context-dependent and selective activation of autophagy in structural cells in asthma. Furthermore, this pathway can be effectively targeted to ameliorate airway remodeling in asthma.</div>
</front>
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<name sortKey="Mcalinden, Kielan D" sort="Mcalinden, Kielan D" uniqKey="Mcalinden K" first="Kielan D" last="Mcalinden">Kielan D. Mcalinden</name>
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<country name="États-Unis">
<region name="Pennsylvanie">
<name sortKey="Deshpande, Deepak A" sort="Deshpande, Deepak A" uniqKey="Deshpande D" first="Deepak A" last="Deshpande">Deepak A. Deshpande</name>
</region>
</country>
<country name="Canada">
<region name="Manitoba">
<name sortKey="Ghavami, Saeid" sort="Ghavami, Saeid" uniqKey="Ghavami S" first="Saeid" last="Ghavami">Saeid Ghavami</name>
</region>
</country>
<country name="Australie">
<region name="Nouvelle-Galles du Sud">
<name sortKey="Xenaki, Dia" sort="Xenaki, Dia" uniqKey="Xenaki D" first="Dia" last="Xenaki">Dia Xenaki</name>
</region>
<name sortKey="Oliver, Brian G" sort="Oliver, Brian G" uniqKey="Oliver B" first="Brian G" last="Oliver">Brian G. Oliver</name>
<name sortKey="Sharma, Pawan" sort="Sharma, Pawan" uniqKey="Sharma P" first="Pawan" last="Sharma">Pawan Sharma</name>
<name sortKey="Sohal, Sukhwinder Singh" sort="Sohal, Sukhwinder Singh" uniqKey="Sohal S" first="Sukhwinder Singh" last="Sohal">Sukhwinder Singh Sohal</name>
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