Change in membrane potential induced by streptolysin O, a pore-forming toxin: flow cytometric analysis using a voltage-sensitive fluorescent probe and rat thymic lymphocytes.
Microbiol Immunol
; 64(1): 10-22, 2020 Jan.
Article
em En
| MEDLINE
| ID: mdl-31584206
ABSTRACT
Streptolysin O (SLO) is a bacterial pore-forming toxin that is employed to permeabilize cell membranes in some biological experiments. SLO forms various types of pores with different shapes, increasing membrane ion permeability and subsequently inducing changes in membrane potential. To characterize the pores formed by SLO, the changes in membrane potential induced by SLO in rat lymphocytes were considered using flow cytometry with a voltage-sensitive fluorescent probe, bis-(1,3-dibutylbarbituric acid)trimethine oxonol (Oxonol). SLO caused three types of membrane potential responses accessed with Oxonol. One type induces a great decrease in Oxonol fluorescence (large hyperpolarization) that may be elicited via the increase of Ca2+ -dependent K+ permeability by SLO-induced influx of external Ca2+ . A second type is an increase in Oxonol fluorescence (depolarization) that may be caused by a nonspecific increase in membrane cation permeability. The third type is a small decrease in Oxonol fluorescence (small hyperpolarization), probably via an increase in Cl- permeability. That SLO transitionally changes membrane ion permeability may have implications in the pathology of pyogenic group streptococci infections in which SLO is thought to be one of the key virulence factors.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Estreptolisinas
/
Toxinas Bacterianas
/
Linfócitos
/
Potenciais da Membrana
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Microbiol Immunol
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Japão