<italic toggle="yes">N</italic>-Acetylglucosamine Metabolism Promotes Survival of <named-content content-type="genus-species">Candida albicans</named-content> in the Phagosome

ABSTRACT Phagocytosis by innate immune cells is one of the most effective barriers against the multiplication and dissemination of microbes within the mammalian host. Candida albicans, a pathogenic yeast, has robust mechanisms that allow survival upon macrophage phagocytosis. C. albicans survives in...

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Autores principales:	Elisa M. Vesely, Robert B. Williams, James B. Konopka, Michael C. Lorenz
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2017
Materias:	Candida albicans N-acetylglucosamine host-cell interactions phagosomes Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/1123c81bed3b43f2936c9c62edf60ab8
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spelling	oai:doaj.org-article:1123c81bed3b43f2936c9c62edf60ab82021-11-15T15:22:05Z<italic toggle="yes">N</italic>-Acetylglucosamine Metabolism Promotes Survival of <named-content content-type="genus-species">Candida albicans</named-content> in the Phagosome10.1128/mSphere.00357-172379-5042https://doaj.org/article/1123c81bed3b43f2936c9c62edf60ab82017-10-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mSphere.00357-17https://doaj.org/toc/2379-5042ABSTRACT Phagocytosis by innate immune cells is one of the most effective barriers against the multiplication and dissemination of microbes within the mammalian host. Candida albicans, a pathogenic yeast, has robust mechanisms that allow survival upon macrophage phagocytosis. C. albicans survives in part because it can utilize the alternative carbon sources available in the phagosome, including carboxylic acids and amino acids. Furthermore, metabolism of these compounds raises the pH of the extracellular environment, which combats the acidification and maturation of the phagolysosome. In this study, we demonstrate that metabolism by C. albicans of an additional carbon source, N-acetylglucosamine (GlcNAc), facilitates neutralization of the phagosome by a novel mechanism. Catabolism of GlcNAc raised the ambient pH through release of ammonia, which is distinct from growth on carboxylic acids but similar to growth on amino acids. However, the effect of GlcNAc metabolism on pH was genetically distinct from the neutralization induced by catabolism of amino acids, as mutation of STP2 or ATO5 did not impair the effects of GlcNAc. In contrast, mutants lacking the dedicated GlcNAc transporter gene NGT1 or the enzymes responsible for catabolism of GlcNAc were defective in altering the pH of the phagosome. This correlated with reduced survival following phagocytosis and decreased ability to damage macrophages. Thus, GlcNAc metabolism represents the third genetically independent mechanism that C. albicans utilizes to combat the rapid acidification of the phagolysosome, allowing for cells to escape and propagate infection. IMPORTANCE Candida albicans is the most important medically relevant fungal pathogen, with disseminated candidiasis being the fourth most common hospital-associated bloodstream infection. Macrophages and neutrophils are innate immune cells that play a key role in host defense by phagocytosing and destroying C. albicans cells. To survive this attack by macrophages, C. albicans generates energy by utilizing alternative carbon sources that are available in the phagosome. Interestingly, metabolism of amino acids and carboxylic acids by C. albicans raises the pH of the phagosome and thereby blocks the acidification of the phagosome, which is needed to initiate antimicrobial attack. In this work, we demonstrate that metabolism of a third type of carbon source, the amino sugar GlcNAc, also induces pH neutralization and survival of C. albicans upon phagocytosis. This mechanism is genetically and physiologically distinct from the previously described mechanisms of pH neutralization, indicating that the robust metabolic plasticity of C. albicans ensures survival upon macrophage phagocytosis.Elisa M. VeselyRobert B. WilliamsJames B. KonopkaMichael C. LorenzAmerican Society for MicrobiologyarticleCandida albicansN-acetylglucosaminehost-cell interactionsphagosomesMicrobiologyQR1-502ENmSphere, Vol 2, Iss 5 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Candida albicans N-acetylglucosamine host-cell interactions phagosomes Microbiology QR1-502
spellingShingle	Candida albicans N-acetylglucosamine host-cell interactions phagosomes Microbiology QR1-502 Elisa M. Vesely Robert B. Williams James B. Konopka Michael C. Lorenz <italic toggle="yes">N</italic>-Acetylglucosamine Metabolism Promotes Survival of <named-content content-type="genus-species">Candida albicans</named-content> in the Phagosome
description	ABSTRACT Phagocytosis by innate immune cells is one of the most effective barriers against the multiplication and dissemination of microbes within the mammalian host. Candida albicans, a pathogenic yeast, has robust mechanisms that allow survival upon macrophage phagocytosis. C. albicans survives in part because it can utilize the alternative carbon sources available in the phagosome, including carboxylic acids and amino acids. Furthermore, metabolism of these compounds raises the pH of the extracellular environment, which combats the acidification and maturation of the phagolysosome. In this study, we demonstrate that metabolism by C. albicans of an additional carbon source, N-acetylglucosamine (GlcNAc), facilitates neutralization of the phagosome by a novel mechanism. Catabolism of GlcNAc raised the ambient pH through release of ammonia, which is distinct from growth on carboxylic acids but similar to growth on amino acids. However, the effect of GlcNAc metabolism on pH was genetically distinct from the neutralization induced by catabolism of amino acids, as mutation of STP2 or ATO5 did not impair the effects of GlcNAc. In contrast, mutants lacking the dedicated GlcNAc transporter gene NGT1 or the enzymes responsible for catabolism of GlcNAc were defective in altering the pH of the phagosome. This correlated with reduced survival following phagocytosis and decreased ability to damage macrophages. Thus, GlcNAc metabolism represents the third genetically independent mechanism that C. albicans utilizes to combat the rapid acidification of the phagolysosome, allowing for cells to escape and propagate infection. IMPORTANCE Candida albicans is the most important medically relevant fungal pathogen, with disseminated candidiasis being the fourth most common hospital-associated bloodstream infection. Macrophages and neutrophils are innate immune cells that play a key role in host defense by phagocytosing and destroying C. albicans cells. To survive this attack by macrophages, C. albicans generates energy by utilizing alternative carbon sources that are available in the phagosome. Interestingly, metabolism of amino acids and carboxylic acids by C. albicans raises the pH of the phagosome and thereby blocks the acidification of the phagosome, which is needed to initiate antimicrobial attack. In this work, we demonstrate that metabolism of a third type of carbon source, the amino sugar GlcNAc, also induces pH neutralization and survival of C. albicans upon phagocytosis. This mechanism is genetically and physiologically distinct from the previously described mechanisms of pH neutralization, indicating that the robust metabolic plasticity of C. albicans ensures survival upon macrophage phagocytosis.
format	article
author	Elisa M. Vesely Robert B. Williams James B. Konopka Michael C. Lorenz
author_facet	Elisa M. Vesely Robert B. Williams James B. Konopka Michael C. Lorenz
author_sort	Elisa M. Vesely
title	<italic toggle="yes">N</italic>-Acetylglucosamine Metabolism Promotes Survival of <named-content content-type="genus-species">Candida albicans</named-content> in the Phagosome
title_short	<italic toggle="yes">N</italic>-Acetylglucosamine Metabolism Promotes Survival of <named-content content-type="genus-species">Candida albicans</named-content> in the Phagosome
title_full	<italic toggle="yes">N</italic>-Acetylglucosamine Metabolism Promotes Survival of <named-content content-type="genus-species">Candida albicans</named-content> in the Phagosome
title_fullStr	<italic toggle="yes">N</italic>-Acetylglucosamine Metabolism Promotes Survival of <named-content content-type="genus-species">Candida albicans</named-content> in the Phagosome
title_full_unstemmed	<italic toggle="yes">N</italic>-Acetylglucosamine Metabolism Promotes Survival of <named-content content-type="genus-species">Candida albicans</named-content> in the Phagosome
title_sort	<italic toggle="yes">n</italic>-acetylglucosamine metabolism promotes survival of <named-content content-type="genus-species">candida albicans</named-content> in the phagosome
publisher	American Society for Microbiology
publishDate	2017
url	https://doaj.org/article/1123c81bed3b43f2936c9c62edf60ab8
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<italic toggle="yes">N</italic>-Acetylglucosamine Metabolism Promotes Survival of <named-content content-type="genus-species">Candida albicans</named-content> in the Phagosome

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