Iron acquisition within host cells and the pathogenicity of Leishmania
Iron is an essential cofactor for several enzymes and metabolic pathways, in both microbes and in their eukaryotic hosts. To avoid toxicity, iron acquisition is tightly regulated. This represents a particular challenge for pathogens that reside within the endocytic pathway of mammalian cells, becaus...
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| Published in | Cellular microbiology Vol. 10; no. 2; pp. 293 - 300 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Oxford, UK
Oxford, UK : Blackwell Publishing Ltd
01.02.2008
Blackwell Publishing Ltd Hindawi Limited |
| Subjects | |
| Online Access | Get full text |
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| Abstract | Iron is an essential cofactor for several enzymes and metabolic pathways, in both microbes and in their eukaryotic hosts. To avoid toxicity, iron acquisition is tightly regulated. This represents a particular challenge for pathogens that reside within the endocytic pathway of mammalian cells, because endosomes and lysosomes are gradually depleted in iron by host transporters. An important player in this process is Nramp1 (Slc11a1), a proton efflux pump that translocates Fe²⁺ and Mn²⁺ ions from macrophage lysosomes/phagolysosomes into the cytosol. Mutations in Nramp1 cause susceptibility to infection with the bacteria Salmonella and Mycobacteria and the protozoan Leishmania, indicating that an available pool of intraphagosomal iron is critical for the intracellular survival and replication of these pathogens. Salmonella and Mycobacteria are known to express iron transporter systems that effectively compete with host transporters for iron. Until recently, however, very little was known about the molecular strategy used by Leishmania for survival in the iron-poor environment of macrophage phagolysosomes. It is now clear that intracellular residence induces Leishmania amazonensis to express LIT1, a ZIP family membrane Fe²⁺ transporter that is required for intracellular growth and virulence. |
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| AbstractList | Iron is an essential cofactor for several enzymes and metabolic pathways, in both microbes and in their eukaryotic hosts. To avoid toxicity, iron acquisition is tightly regulated. This represents a particular challenge for pathogens that reside within the endocytic pathway of mammalian cells, because endosomes and lysosomes are gradually depleted in iron by host transporters. An important player in this process is Nramp1 (Slc11a1), a proton efflux pump that translocates Fe2+ and Mn2+ ions from macrophage lysosomes/phagolysosomes into the cytosol. Mutations in Nramp1 cause susceptibility to infection with the bacteria Salmonella and Mycobacteria and the protozoan Leishmania , indicating that an available pool of intraphagosomal iron is critical for the intracellular survival and replication of these pathogens. Salmonella and Mycobacteria are known to express iron transporter systems that effectively compete with host transporters for iron. Until recently, however, very little was known about the molecular strategy used by Leishmania for survival in the iron-poor environment of macrophage phagolysosomes. It is now clear that intracellular residence induces Leishmania amazonensis to express LIT1, a ZIP family membrane Fe2+ transporter that is required for intracellular growth and virulence. Iron is an essential cofactor for several enzymes and metabolic pathways, in both microbes and in their eukaryotic hosts. To avoid toxicity, iron acquisition is tightly regulated. This represents a particular challenge for pathogens that reside within the endocytic pathway of mammalian cells, because endosomes and lysosomes are gradually depleted in iron by host transporters. An important player in this process is Nramp1 (Slc11a1), a proton efflux pump that translocates Fe²⁺ and Mn²⁺ ions from macrophage lysosomes/phagolysosomes into the cytosol. Mutations in Nramp1 cause susceptibility to infection with the bacteria Salmonella and Mycobacteria and the protozoan Leishmania, indicating that an available pool of intraphagosomal iron is critical for the intracellular survival and replication of these pathogens. Salmonella and Mycobacteria are known to express iron transporter systems that effectively compete with host transporters for iron. Until recently, however, very little was known about the molecular strategy used by Leishmania for survival in the iron-poor environment of macrophage phagolysosomes. It is now clear that intracellular residence induces Leishmania amazonensis to express LIT1, a ZIP family membrane Fe²⁺ transporter that is required for intracellular growth and virulence. Iron is an essential cofactor for several enzymes and metabolic pathways, in both microbes and in their eukaryotic hosts. To avoid toxicity, iron acquisition is tightly regulated. This represents a particular challenge for pathogens that reside within the endocytic pathway of mammalian cells, because endosomes and lysosomes are gradually depleted in iron by host transporters. An important player in this process is Nramp1 (Slc11a1), a proton efflux pump that translocates Fe 2+ and Mn 2+ ions from macrophage lysosomes/phagolysosomes into the cytosol. Mutations in Nramp1 cause susceptibility to infection with the bacteria Salmonella and Mycobacteria and the protozoan Leishmania , indicating that an available pool of intraphagosomal iron is critical for the intracellular survival and replication of these pathogens. Salmonella and Mycobacteria are known to express iron transporter systems that effectively compete with host transporters for iron. Until recently, however, very little was known about the molecular strategy used by Leishmania for survival in the iron-poor environment of macrophage phagolysosomes. It is now clear that intracellular residence induces Leishmania amazonensis to express LIT1, a ZIP family membrane Fe 2+ transporter that is required for intracellular growth and virulence. Iron is an essential cofactor for several enzymes and metabolic pathways, in both microbes and in their eukaryotic hosts. To avoid toxicity, iron acquisition is tightly regulated. This represents a particular challenge for pathogens that reside within the endocytic pathway of mammalian cells, because endosomes and lysosomes are gradually depleted in iron by host transporters. An important player in this process is Nramp1 (Slc11a1), a proton efflux pump that translocates Fe(2+) and Mn(2+) ions from macrophage lysosomes/phagolysosomes into the cytosol. Mutations in Nramp1 cause susceptibility to infection with the bacteria Salmonella and Mycobacteria and the protozoan Leishmania, indicating that an available pool of intraphagosomal iron is critical for the intracellular survival and replication of these pathogens. Salmonella and Mycobacteria are known to express iron transporter systems that effectively compete with host transporters for iron. Until recently, however, very little was known about the molecular strategy used by Leishmania for survival in the iron-poor environment of macrophage phagolysosomes. It is now clear that intracellular residence induces Leishmania amazonensis to express LIT1, a ZIP family membrane Fe(2+) transporter that is required for intracellular growth and virulence. Summary Iron is an essential cofactor for several enzymes and metabolic pathways, in both microbes and in their eukaryotic hosts. To avoid toxicity, iron acquisition is tightly regulated. This represents a particular challenge for pathogens that reside within the endocytic pathway of mammalian cells, because endosomes and lysosomes are gradually depleted in iron by host transporters. An important player in this process is Nramp1 (Slc11a1), a proton efflux pump that translocates Fe2+ and Mn2+ ions from macrophage lysosomes/phagolysosomes into the cytosol. Mutations in Nramp1 cause susceptibility to infection with the bacteria Salmonella and Mycobacteria and the protozoan Leishmania, indicating that an available pool of intraphagosomal iron is critical for the intracellular survival and replication of these pathogens. Salmonella and Mycobacteria are known to express iron transporter systems that effectively compete with host transporters for iron. Until recently, however, very little was known about the molecular strategy used by Leishmania for survival in the iron‐poor environment of macrophage phagolysosomes. It is now clear that intracellular residence induces Leishmania amazonensis to express LIT1, a ZIP family membrane Fe2+ transporter that is required for intracellular growth and virulence. |
| Author | Andrews, Norma W Huynh, Chau |
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| Snippet | Iron is an essential cofactor for several enzymes and metabolic pathways, in both microbes and in their eukaryotic hosts. To avoid toxicity, iron acquisition... Summary Iron is an essential cofactor for several enzymes and metabolic pathways, in both microbes and in their eukaryotic hosts. To avoid toxicity, iron... |
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| SubjectTerms | Animals Biological Transport - genetics Biological Transport - physiology Cell Membrane - metabolism Iron - metabolism Leishmania - genetics Leishmania - metabolism Leishmania - pathogenicity Models, Biological Proton Pumps - genetics Proton Pumps - metabolism Proton Pumps - physiology Protozoan Proteins - genetics Protozoan Proteins - metabolism Protozoan Proteins - physiology Siderophores - metabolism Siderophores - physiology |
| Title | Iron acquisition within host cells and the pathogenicity of Leishmania |
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