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Human anti-peptidoglycan-IgG-mediated opsonophagocytosis is controlled by calcium mobilization in phorbol myristate acetate-treated U937 cells

Recently, we demonstrated that human serum amyloid P component (SAP) specifically recognizes exposed bacterial peptidoglycan (PGN) of wall teichoic acid (WTA)-deficient Staphylococcus aureus ΔtagO mutant cells and then induces complement-independent phagocytosis. In our preliminary experiments, we f...

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Detalles Bibliográficos
Autores principales: Kim, Min Jung, Rah, So-Young, An, Jang-Hyun, Kurokawa, Kenji, Kim, Uh-Hyun, Lee, Bok Luel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Korean Society for Biochemistry and Molecular Biology 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4345640/
https://www.ncbi.nlm.nih.gov/pubmed/24856825
http://dx.doi.org/10.5483/BMBRep.2015.48.1.080
Descripción
Sumario:Recently, we demonstrated that human serum amyloid P component (SAP) specifically recognizes exposed bacterial peptidoglycan (PGN) of wall teichoic acid (WTA)-deficient Staphylococcus aureus ΔtagO mutant cells and then induces complement-independent phagocytosis. In our preliminary experiments, we found the existence of human serum immunoglobulins that recognize S. aureus PGN (anti-PGNIgGs), which may be involved in complement-dependent opsonophagocytosis against infected S. aureus cells. We assumed that purified serum anti-PGN-IgGs and S. aureus ΔtagO mutant cells are good tools to study the molecular mechanism of anti-PGN-IgG-mediated phagocytosis. Therefore, we tried to identify the intracellular molecule(s) that is involved in the anti-PGN-IgG-mediated phagocytosis using purified human serum anti-PGN-IgGs and different S. aureus mutant cells. Here, we show that anti-PGN-IgG-mediated phagocytosis in phorbol myristate acetate-treated U937 cells is mediated by Ca(2+) release from intracellular Ca(2+) stores and anti-PGN-IgGdependent Ca(2+) mobilization is controlled via a phospholipase Cγ-2-mediated pathway. [BMB Reports 2015; 48(1): 36-41]