Single-chain variable fragment (scFv) targeting streptolysin O controls group A Streptococcus infection.

Single-chain variable fragment (scFv) targeting streptolysin O controls group A Streptococcus infection.
复制标题

靶向链球菌溶血素 O 的单链可变片段 (scFv) 控制 A 组链球菌感染。

DOI:
10.1016/j.bbrc.2021.06.021
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发表时间:
2021
影响因子:
3.1
通讯作者:
Nakagawa I
Nakagawa I
中科院分区:
生物学4区
文献类型:
--
作者:
Aikawa C;Kawashima K;Fukuzaki C;Nakakido M;Murase K;Nozawa T;Tsumoto K;Nakagawa I

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化脓性链球菌(Streptococcus pyogenes,GAS)引起一系列人类疾病,包括危及生命和严重侵入性GAS感染,如链球菌中毒性休克综合征(STSS)。包括青霉素在内的几种抗生素对GAS有效。尽管如此,侵袭性GAS疾病具有高死亡率(>30%)。STSS患者的临床分离株显示出较高的成孔链球菌溶血素O(SLO)表达。因此,SLO是GAS的重要致病因素,可能是治疗GAS疾病的有效靶点。我们成功地获得了能够识别SLO的单链可变片段(scFv)SLO-I4,其显著抑制了红细胞、巨噬细胞和上皮细胞中的GAS诱导的细胞裂解活性。在上皮细胞中,SLO-I4显著减少SLO介导的内体膜损伤,从而防止细菌从内体逃逸。抗SLO scFv在抵消SLO功能中的有效性表明其可能有益于对抗GAS感染。
Streptococcus pyogenes(Group AStreptococcus, GAS) causes a range of human diseases, including life-threatening and severe invasive GAS infections, such as streptococcal toxic shock syndrome (STSS). Several antibiotics, including penicillin, are effective against GAS. Still, invasive GAS diseases have a high mortality rate (>30%). Clinical isolates from STSS patients show higher expression of pore-forming streptolysin O (SLO). Thus, SLO is an important pathogenic factor for GAS and may be an effective target for treatment of GAS disease. We succeeded in obtaining a single-chain variable fragment (scFv) SLO-I4 capable of recognizing SLO, which significantly inhibited GAS-induced cell lytic activity in erythrocytes, macrophages, and epithelial cells. In epithelial cells, SLO-I4 significantly reduced SLO-mediated endosomal membrane damage, which consequently prevented bacterial escape from the endosome. The effectiveness of anti-SLO scFv in counteracting SLO function suggests that it might be beneficial against GAS infections.
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