Article (Scientific journals)
Distinct spatiotemporal distribution of bacterial toxin-produced cellular camp differentially inhibits opsonophagocytic signaling
Hasan, Shakir; Rahman, W. U.; Sebo, P. et al.
2019In Toxins, 11 (6)
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Keywords :
Adenylate cyclase toxin; Edema toxin; Opsonophagocytosis; Phagocytes; Pyk2; Signaling pathway; Syk; Vav; Vav protein; Bacillus anthracis; Bordetella pertussis; Review
Abstract :
[en] Myeloid phagocytes have evolved to rapidly recognize invading pathogens and clear them through opsonophagocytic killing. The adenylate cyclase toxin (CyaA) of Bordetella pertussis and the edema toxin (ET) of Bacillus anthracis 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. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
Disciplines :
Microbiology
Author, co-author :
Hasan, Shakir ;  Université de Liège - ULiège > I3-Immunophysiology
Rahman, W. U.;  Institute of Microbiology of the CAS, v. v. i., Videnska 1083Prague 142 20, Czech Republic
Sebo, P.;  Institute of Microbiology of the CAS, v. v. i., Videnska 1083Prague 142 20, Czech Republic
Osicka, R.;  Institute of Microbiology of the CAS, v. v. i., Videnska 1083Prague 142 20, Czech Republic
Language :
English
Title :
Distinct spatiotemporal distribution of bacterial toxin-produced cellular camp differentially inhibits opsonophagocytic signaling
Publication date :
2019
Journal title :
Toxins
eISSN :
2072-6651
Publisher :
MDPI AG
Volume :
11
Issue :
6
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 05 June 2020

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