Selective enhancement of the cell-permeabilizing activity of adenylate cyclase toxin does not increase virulence of bordetella pertussis

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388971%3A_____%2F21%3A00549727" target="_blank" >RIV/61388971:_____/21:00549727 - isvavai.cz</a>

Alternative codes found

RIV/68378050:_____/21:00555862 RIV/00216224:14740/21:00124529

Result on the web

<a href="https://www.mdpi.com/1422-0067/22/21/11655" target="_blank" >https://www.mdpi.com/1422-0067/22/21/11655</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/ijms222111655" target="_blank" >10.3390/ijms222111655</a>

Result language

angličtina

Original language name

Selective enhancement of the cell-permeabilizing activity of adenylate cyclase toxin does not increase virulence of bordetella pertussis

Original language description

The whooping cough agent, Bordetella pertussis, secretes an adenylate cyclase toxin– hemolysin (CyaA, ACT, or AC-Hly) that catalyzes the conversion of intracellular ATP to cAMP and through its signaling annihilates the bactericidal activities of host sentinel phagocytes. In parallel, CyaA permeabilizes host cells by the formation of cation-selective membrane pores that account for the hemolytic activity of CyaA. The pore-forming activity contributes to the overall cytotoxic effect of CyaA in vitro, and it has previously been proposed to synergize with the cAMP-elevating activity in conferring full virulence on B. pertussis in the mouse model of pneumonic infection. CyaA primarily targets myeloid phagocytes through binding of their complement receptor 3 (CR3, integrin αMβ2, or CD11b/CD18). However, with a reduced efficacy, the toxin can promiscuously penetrate and permeabilize the cell membrane of a variety of non-myeloid cells that lack CR3 on the cell surface, including airway epithelial cells or erythrocytes, and detectably intoxicates them by cAMP. Here, we used CyaA variants with strongly and selectively enhanced or reduced pore-forming activity that, at the same time, exhibited a full capacity to elevate cAMP concentrations in both CR3-expressing and CR3-non-expressing target cells. Using B. pertussis mutants secreting such CyaA variants, we show that a selective enhancement of the cell-permeabilizing activity of CyaA does not increase the overall virulence and lethality of pneumonic B. pertussis infection of mice any further. In turn, a reduction of the cell-permeabilizing activity of CyaA did not reduce B. pertussis virulence any importantly. These results suggest that the phagocyte-paralyzing cAMP-elevating capacity of CyaA prevails over the cell-permeabilizing activity of CyaA that appears to play an auxiliary role in the biological activity of the CyaA toxin in the course of B. pertussis infections in vivo.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10606 - Microbiology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

International Journal of Molecular Sciences

ISSN

1422-0067

e-ISSN

1422-0067

Volume of the periodical

22

Issue of the periodical within the volume

21

Country of publishing house

CH - SWITZERLAND

Number of pages

18

Pages from-to

11655

UT code for WoS article

000726625300001

EID of the result in the Scopus database

2-s2.0-85117920332