<italic toggle="yes">SLC6A14</italic> Is a Genetic Modifier of Cystic Fibrosis That Regulates <italic toggle="yes">Pseudomonas aeruginosa</italic> Attachment to Human Bronchial Epithelial Cells

ABSTRACT Cystic fibrosis (CF) is caused by mutations in the CFTR gene and is associated with progressive and ultimately fatal infectious lung disease. There can be considerable variability in disease severity among individuals with the same CFTR mutations, and recent genome-wide association studies...

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Autores principales:	Michelle Di Paola, Amber J. Park, Saumel Ahmadi, Elyse J. Roach, Yu-Sheng Wu, Michaela Struder-Kypke, Joseph S. Lam, Christine E. Bear, Cezar M. Khursigara
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2017
Materias:	CFTR mutation l-arginine uptake Pseudomonas aeruginosa SLC6A14 airway epithelia bacterial colonization Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/76ee622aef314119b45318ab4b87d2aa
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spelling	oai:doaj.org-article:76ee622aef314119b45318ab4b87d2aa2021-11-15T15:51:55Z<italic toggle="yes">SLC6A14</italic> Is a Genetic Modifier of Cystic Fibrosis That Regulates <italic toggle="yes">Pseudomonas aeruginosa</italic> Attachment to Human Bronchial Epithelial Cells10.1128/mBio.02073-172150-7511https://doaj.org/article/76ee622aef314119b45318ab4b87d2aa2017-12-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mBio.02073-17https://doaj.org/toc/2150-7511ABSTRACT Cystic fibrosis (CF) is caused by mutations in the CFTR gene and is associated with progressive and ultimately fatal infectious lung disease. There can be considerable variability in disease severity among individuals with the same CFTR mutations, and recent genome-wide association studies have identified secondary genetic factors that contribute to this. One of these modifier genes is SLC6A14, which encodes an amino acid transporter. Importantly, variants of this gene have been associated with age at first acquisition of Pseudomonas aeruginosa. In this study, we aimed to determine the function of SLC6A14 in airway epithelia and how it might affect colonization by P. aeruginosa. We show that SLC6A14 is expressed in respiratory epithelial cells and transports l-arginine out of the airway surface liquid (ASL). Exposure of airway epithelia to flagellin from P. aeruginosa led to upregulation of SLC6A14 expression and increased SLC6A14-dependent uptake of l-arginine from the ASL. In support of the hypothesis that l-arginine affects P. aeruginosa attachment, we showed that l-arginine supplementation promoted P. aeruginosa attachment to an abiotic surface in a dose-dependent manner. In a coculture model, we found that inhibition of SLC6A14-dependent l-arginine transport enhanced P. aeruginosa attachment. In Slc6a14−/y (knockout) mice, P. aeruginosa attachment to lung tissue was also significantly enhanced. Together, these findings suggest that SLC6A14 activity plays a role in the modification of the initial stages of airway infection by altering the level of l-arginine in the ASL, which in turn affects the attachment of P. aeruginosa. IMPORTANCE CF patients with shared CFTR gene mutations show significant variability in their clinical presentation of infectious lung disease. Genome-wide association studies have been used to identify secondary genetic factors that may explain the variable susceptibility to infection by opportunistic pathogens, including P. aeruginosa, the leading cause of pathogen-induced lung damage in nonpediatric CF patients. Once identified and characterized, these secondary genetic modifiers may allow for the development of personalized medicine for patients and ultimately the extension of life. In this study, we interrogated the biological role of one of these modifiers, SLC6A14, and showed that it contributes to host defense by depleting extracellular arginine (an attachment-promoting metabolite for P. aeruginosa) from the airway surface liquid.Michelle Di PaolaAmber J. ParkSaumel AhmadiElyse J. RoachYu-Sheng WuMichaela Struder-KypkeJoseph S. LamChristine E. BearCezar M. KhursigaraAmerican Society for MicrobiologyarticleCFTR mutationl-arginine uptakePseudomonas aeruginosaSLC6A14airway epitheliabacterial colonizationMicrobiologyQR1-502ENmBio, Vol 8, Iss 6 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	CFTR mutation l-arginine uptake Pseudomonas aeruginosa SLC6A14 airway epithelia bacterial colonization Microbiology QR1-502
spellingShingle	CFTR mutation l-arginine uptake Pseudomonas aeruginosa SLC6A14 airway epithelia bacterial colonization Microbiology QR1-502 Michelle Di Paola Amber J. Park Saumel Ahmadi Elyse J. Roach Yu-Sheng Wu Michaela Struder-Kypke Joseph S. Lam Christine E. Bear Cezar M. Khursigara <italic toggle="yes">SLC6A14</italic> Is a Genetic Modifier of Cystic Fibrosis That Regulates <italic toggle="yes">Pseudomonas aeruginosa</italic> Attachment to Human Bronchial Epithelial Cells
description	ABSTRACT Cystic fibrosis (CF) is caused by mutations in the CFTR gene and is associated with progressive and ultimately fatal infectious lung disease. There can be considerable variability in disease severity among individuals with the same CFTR mutations, and recent genome-wide association studies have identified secondary genetic factors that contribute to this. One of these modifier genes is SLC6A14, which encodes an amino acid transporter. Importantly, variants of this gene have been associated with age at first acquisition of Pseudomonas aeruginosa. In this study, we aimed to determine the function of SLC6A14 in airway epithelia and how it might affect colonization by P. aeruginosa. We show that SLC6A14 is expressed in respiratory epithelial cells and transports l-arginine out of the airway surface liquid (ASL). Exposure of airway epithelia to flagellin from P. aeruginosa led to upregulation of SLC6A14 expression and increased SLC6A14-dependent uptake of l-arginine from the ASL. In support of the hypothesis that l-arginine affects P. aeruginosa attachment, we showed that l-arginine supplementation promoted P. aeruginosa attachment to an abiotic surface in a dose-dependent manner. In a coculture model, we found that inhibition of SLC6A14-dependent l-arginine transport enhanced P. aeruginosa attachment. In Slc6a14−/y (knockout) mice, P. aeruginosa attachment to lung tissue was also significantly enhanced. Together, these findings suggest that SLC6A14 activity plays a role in the modification of the initial stages of airway infection by altering the level of l-arginine in the ASL, which in turn affects the attachment of P. aeruginosa. IMPORTANCE CF patients with shared CFTR gene mutations show significant variability in their clinical presentation of infectious lung disease. Genome-wide association studies have been used to identify secondary genetic factors that may explain the variable susceptibility to infection by opportunistic pathogens, including P. aeruginosa, the leading cause of pathogen-induced lung damage in nonpediatric CF patients. Once identified and characterized, these secondary genetic modifiers may allow for the development of personalized medicine for patients and ultimately the extension of life. In this study, we interrogated the biological role of one of these modifiers, SLC6A14, and showed that it contributes to host defense by depleting extracellular arginine (an attachment-promoting metabolite for P. aeruginosa) from the airway surface liquid.
format	article
author	Michelle Di Paola Amber J. Park Saumel Ahmadi Elyse J. Roach Yu-Sheng Wu Michaela Struder-Kypke Joseph S. Lam Christine E. Bear Cezar M. Khursigara
author_facet	Michelle Di Paola Amber J. Park Saumel Ahmadi Elyse J. Roach Yu-Sheng Wu Michaela Struder-Kypke Joseph S. Lam Christine E. Bear Cezar M. Khursigara
author_sort	Michelle Di Paola
title	<italic toggle="yes">SLC6A14</italic> Is a Genetic Modifier of Cystic Fibrosis That Regulates <italic toggle="yes">Pseudomonas aeruginosa</italic> Attachment to Human Bronchial Epithelial Cells
title_short	<italic toggle="yes">SLC6A14</italic> Is a Genetic Modifier of Cystic Fibrosis That Regulates <italic toggle="yes">Pseudomonas aeruginosa</italic> Attachment to Human Bronchial Epithelial Cells
title_full	<italic toggle="yes">SLC6A14</italic> Is a Genetic Modifier of Cystic Fibrosis That Regulates <italic toggle="yes">Pseudomonas aeruginosa</italic> Attachment to Human Bronchial Epithelial Cells
title_fullStr	<italic toggle="yes">SLC6A14</italic> Is a Genetic Modifier of Cystic Fibrosis That Regulates <italic toggle="yes">Pseudomonas aeruginosa</italic> Attachment to Human Bronchial Epithelial Cells
title_full_unstemmed	<italic toggle="yes">SLC6A14</italic> Is a Genetic Modifier of Cystic Fibrosis That Regulates <italic toggle="yes">Pseudomonas aeruginosa</italic> Attachment to Human Bronchial Epithelial Cells
title_sort	<italic toggle="yes">slc6a14</italic> is a genetic modifier of cystic fibrosis that regulates <italic toggle="yes">pseudomonas aeruginosa</italic> attachment to human bronchial epithelial cells
publisher	American Society for Microbiology
publishDate	2017
url	https://doaj.org/article/76ee622aef314119b45318ab4b87d2aa
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<italic toggle="yes">SLC6A14</italic> Is a Genetic Modifier of Cystic Fibrosis That Regulates <italic toggle="yes">Pseudomonas aeruginosa</italic> Attachment to Human Bronchial Epithelial Cells

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