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

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
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链球菌溶血素 O(一种成孔毒素)引起的膜电位变化:使用电压敏感荧光探针和大鼠胸腺淋巴细胞进行流式细胞术分析

DOI:
10.1111/1348-0421.12748
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发表时间:
2019
影响因子:
2.6
通讯作者:
Atsushi Tabata
Atsushi Tabata
中科院分区:
医学4区
文献类型:
--
作者:
Miho Kobayashi;Madoka Nishimura;Mina Kawamura;Norio Kamemura;Hideaki Nagamune;Atsushi Tabata

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链球菌溶血素 O (SLO) 是一种细菌成孔毒素,在一些生物实验中用于透化细胞膜。 SLO形成各种不同形状的孔,增加膜离子的渗透性,从而引起膜电位的变化。为了表征 SLO 形成的孔,使用流式细胞术和电压敏感荧光探针双(1,3-二丁基巴比妥酸)三甲川氧杂菁 (Oxonol) 来考虑 SLO 在大鼠淋巴细胞中引起的膜电位变化。 SLO 引起三种类型的 Oxonol 膜电位反应。一种类型会导致 Oxonol 荧光大幅下降(大超极化),这可能是通过 SLO 诱导的外部 Ca2+ 流入增加 Ca2+ 依赖性 K+ 渗透性而引起的。第二种类型是 Oxonol 荧光(去极化)的增加,这可能是由膜阳离子渗透性的非特异性增加引起的。第三种类型是 Oxonol 荧光的小幅下降(小幅超极化),可能是通过 Cl 渗透性的增加而实现的。 SLO 过渡性地改变膜离子通透性可能对化脓性链球菌感染的病理学有影响,SLO 被认为是其中的关键毒力因子之一。
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.
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