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The Journal of Immunology
Article . 2009 . Peer-reviewed
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Group V Secretory Phospholipase A2 Modulates Phagosome Maturation and Regulates the Innate Immune Response against Candida albicans

Authors: Barbara, Balestrieri; Akiko, Maekawa; Wei, Xing; Michael H, Gelb; Howard R, Katz; Jonathan P, Arm;

Group V Secretory Phospholipase A2 Modulates Phagosome Maturation and Regulates the Innate Immune Response against Candida albicans

Abstract

Abstract Phospholipase A2 (PLA2) hydrolyzes the sn-2 position of cell membrane phospholipids to release fatty acids and lysophospholipids. We have previously reported that group V secretory PLA2 (sPLA2) translocates from the Golgi and recycling endosomes of mouse peritoneal macrophages to newly formed phagosomes and regulates the phagocytosis of zymosan, suggesting a role in innate immunity. Here we report that in macrophages lacking group V sPLA2, phagosome maturation was reduced 50–60% at early time points while the binding of zymosan was unimpaired. The ability of group V sPLA2 to regulate phagocytosis extended to phagocytosis of IgG- and complement-opsonized sheep RBC. Moreover, macrophages lacking group V sPLA2 had delays in phagocytosis, phagosome maturation, and killing of Candida albicans. Cytokine production and eicosanoid generation were not impaired by the lack of group V sPLA2. Furthermore, in a model of systemic candidiasis, mice lacking group V sPLA2 had an increased fungal burden in the kidney, liver, and spleen at day 7 postinfection and increased mortality. Thus, group V sPLA2 regulates phagocytosis through major phagocytic receptors and contributes to the innate immune response against C. albicans by regulating phagocytosis and killing through a mechanism that is likely dependent on phagolysosome fusion.

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Keywords

Tumor Necrosis Factor-alpha, Macrophages, Candidiasis, Zymosan, Membrane Proteins, Nerve Tissue Proteins, Immunity, Innate, Group V Phospholipases A2, Mice, Inbred C57BL, Survival Rate, Mice, Phagocytosis, Phagosomes, Candida albicans, Animals, Lectins, C-Type

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    79
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    influence
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
79
Top 10%
Top 10%
Top 10%
bronze