Distinct Spatiotemporal Distribution of Bacterial Toxin-Produced Cellular cAMP Differentially Inhibits Opsonophagocytic Signaling
Myeloid phagocytes have evolved to rapidly recognize invading pathogens and clear them through opsonophagocytic killing. The adenylate cyclase toxin (CyaA) of <i>Bordetella pertussis</i> and the edema toxin (ET) of <i>Bacillus anthracis</i> are both calmodulin-activated toxin...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-06-01
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| Series: | Toxins |
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| Online Access: | https://www.mdpi.com/2072-6651/11/6/362 |
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| author | Shakir Hasan Waheed Ur Rahman Peter Sebo Radim Osicka |
| author_facet | Shakir Hasan Waheed Ur Rahman Peter Sebo Radim Osicka |
| author_sort | Shakir Hasan |
| collection | DOAJ |
| description | Myeloid phagocytes have evolved to rapidly recognize invading pathogens and clear them through opsonophagocytic killing. The adenylate cyclase toxin (CyaA) of <i>Bordetella pertussis</i> and the edema toxin (ET) of <i>Bacillus anthracis</i> are both calmodulin-activated toxins with adenylyl cyclase activity that invade host cells and massively increase the cellular concentrations of a key second messenger molecule, 3’,5’-cyclic adenosine monophosphate (cAMP). However, the two toxins differ in the kinetics and mode of cell entry and generate different cAMP concentration gradients within the cell. While CyaA rapidly penetrates cells directly across their plasma membrane, the cellular entry of ET depends on receptor-mediated endocytosis and translocation of the enzymatic subunit across the endosomal membrane. We show that CyaA-generated membrane-proximal cAMP gradient strongly inhibits the activation and phosphorylation of Syk, Vav, and Pyk2, thus inhibiting opsonophagocytosis. By contrast, at similar overall cellular cAMP levels, the ET-generated perinuclear cAMP gradient poorly inhibits the activation and phosphorylation of these signaling proteins. Hence, differences in spatiotemporal distribution of cAMP produced by the two adenylyl cyclase toxins differentially affect the opsonophagocytic signaling in myeloid phagocytes. |
| first_indexed | 2024-04-11T22:23:24Z |
| format | Article |
| id | doaj.art-01e3975f944d4cf9b0ebbe3885fd6213 |
| institution | Directory Open Access Journal |
| issn | 2072-6651 |
| language | English |
| last_indexed | 2024-04-11T22:23:24Z |
| publishDate | 2019-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Toxins |
| spelling | doaj.art-01e3975f944d4cf9b0ebbe3885fd62132022-12-22T03:59:55ZengMDPI AGToxins2072-66512019-06-0111636210.3390/toxins11060362toxins11060362Distinct Spatiotemporal Distribution of Bacterial Toxin-Produced Cellular cAMP Differentially Inhibits Opsonophagocytic SignalingShakir Hasan0Waheed Ur Rahman1Peter Sebo2Radim Osicka3Institute of Microbiology of the CAS, v. v. i., Videnska 1083, 142 20 Prague, Czech RepublicInstitute of Microbiology of the CAS, v. v. i., Videnska 1083, 142 20 Prague, Czech RepublicInstitute of Microbiology of the CAS, v. v. i., Videnska 1083, 142 20 Prague, Czech RepublicInstitute of Microbiology of the CAS, v. v. i., Videnska 1083, 142 20 Prague, Czech RepublicMyeloid phagocytes have evolved to rapidly recognize invading pathogens and clear them through opsonophagocytic killing. The adenylate cyclase toxin (CyaA) of <i>Bordetella pertussis</i> and the edema toxin (ET) of <i>Bacillus anthracis</i> are both calmodulin-activated toxins with adenylyl cyclase activity that invade host cells and massively increase the cellular concentrations of a key second messenger molecule, 3’,5’-cyclic adenosine monophosphate (cAMP). However, the two toxins differ in the kinetics and mode of cell entry and generate different cAMP concentration gradients within the cell. While CyaA rapidly penetrates cells directly across their plasma membrane, the cellular entry of ET depends on receptor-mediated endocytosis and translocation of the enzymatic subunit across the endosomal membrane. We show that CyaA-generated membrane-proximal cAMP gradient strongly inhibits the activation and phosphorylation of Syk, Vav, and Pyk2, thus inhibiting opsonophagocytosis. By contrast, at similar overall cellular cAMP levels, the ET-generated perinuclear cAMP gradient poorly inhibits the activation and phosphorylation of these signaling proteins. Hence, differences in spatiotemporal distribution of cAMP produced by the two adenylyl cyclase toxins differentially affect the opsonophagocytic signaling in myeloid phagocytes.https://www.mdpi.com/2072-6651/11/6/3623′,5′-cyclic adenosine monophosphate (cAMP)adenylate cyclase toxinedema toxinopsonophagocytosisphagocytesSykVavPyk2signaling pathway |
| spellingShingle | Shakir Hasan Waheed Ur Rahman Peter Sebo Radim Osicka Distinct Spatiotemporal Distribution of Bacterial Toxin-Produced Cellular cAMP Differentially Inhibits Opsonophagocytic Signaling Toxins 3′,5′-cyclic adenosine monophosphate (cAMP) adenylate cyclase toxin edema toxin opsonophagocytosis phagocytes Syk Vav Pyk2 signaling pathway |
| title | Distinct Spatiotemporal Distribution of Bacterial Toxin-Produced Cellular cAMP Differentially Inhibits Opsonophagocytic Signaling |
| title_full | Distinct Spatiotemporal Distribution of Bacterial Toxin-Produced Cellular cAMP Differentially Inhibits Opsonophagocytic Signaling |
| title_fullStr | Distinct Spatiotemporal Distribution of Bacterial Toxin-Produced Cellular cAMP Differentially Inhibits Opsonophagocytic Signaling |
| title_full_unstemmed | Distinct Spatiotemporal Distribution of Bacterial Toxin-Produced Cellular cAMP Differentially Inhibits Opsonophagocytic Signaling |
| title_short | Distinct Spatiotemporal Distribution of Bacterial Toxin-Produced Cellular cAMP Differentially Inhibits Opsonophagocytic Signaling |
| title_sort | distinct spatiotemporal distribution of bacterial toxin produced cellular camp differentially inhibits opsonophagocytic signaling |
| topic | 3′,5′-cyclic adenosine monophosphate (cAMP) adenylate cyclase toxin edema toxin opsonophagocytosis phagocytes Syk Vav Pyk2 signaling pathway |
| url | https://www.mdpi.com/2072-6651/11/6/362 |
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