Sialidase-based anti-influenza virus therapy protects against secondary pneumococcal infection.

Sialidase-based anti-influenza virus therapy protects against secondary pneumococcal infection.
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DOI:
10.1086/651170
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发表时间:
2010-04-01
期刊:
The Journal of infectious diseases
影响因子:
--
通讯作者:
Fang F
Fang F
中科院分区:
其他
文献类型:
--
作者:
Hedlund M;Aschenbrenner LM;Jensen K;Larson JL;Fang F

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DAS181 (Fludase®) 是一种唾液酸酶融合蛋白,正在临床开发中,作为广谱抗流感病毒 (IFV) 疗法。其他人之前的报告提出了这样的担忧:气道上皮的去唾液酸化可能会增加对肺炎链球菌感染的易感性。为了确定 DAS181 是否会导致肺炎球菌感染的风险增加,我们测试了用 DAS181 处理人类 A549 细胞、健康小鼠和用致死剂量 IFV A/PR/8/34 (H1N1) 或 A/Victoria/3/75 (H3N2) 攻击的小鼠,然后在第 3 天或第 3 天或第 1 天用 104 cfu 肺炎链球菌 (D39) 处理后的肺炎链球菌定植情况。 7. IFV 攻击后 24-48 小时进行 DAS181 治疗。 DAS181 治疗不会增加健康动物体外或体内肺炎链球菌的定植。在 IFV 感染的小鼠中,DAS181 预防肺炎并显着延长生存时间,并将 IFV 病毒滴度抑制 ≥3 个对数。接受治疗的动物均未表现出肺炎链球菌肺部定植增强。此外,柠檬酸杆菌属或克雷伯氏菌属的机会性感染仅发生在接受媒介物的小鼠中,而不是在 DAS181 治疗的动物中发生。这些数据表明 DAS181 治疗不会加剧小鼠的继发细菌感染。 DAS181 可能通过抑制 IFV 来降低继发细菌感染的风险。
DAS181 (Fludase®) is a sialidase fusion protein in clinical development as a broad-spectrum anti-influenza virus (IFV) therapeutics. Previous reports by others raised the concern that desialylation of airway epithelium might increase the susceptibility to Streptococcus pneumoniae infection. To address if DAS181 would lead to increased risk of pneumococcal infection, we tested S. pneumoniae colonization following DAS181 treatment of human A549 cells, healthy mice, and mice challenged with a lethal dose of IFV A/PR/8/34 (H1N1) or A/Victoria/3/75 (H3N2) followed by 104 cfu S. pneumoniae (D39) on day 3 or day 7. DAS181 treatment was given 24–48 hr after IFV challenge. DAS181 treatment did not increase S. pneumoniae colonization in vitro or in vivo in healthy animals. In IFV infected mice, DAS181 prevented pneumonia and significantly prolonged survival and inhibited IFV virus titer by ≥3 logs. None of the treated animals showed enhanced S. pneumoniae lung colonization. Additionally, opportunistic infections by Citrobacter ssp or Klebsiella ssp occurred only in mice receiving vehicle, not in DAS181 treated animals. These data indicate that DAS181 treatment does not exacerbate secondary bacterial infection in mice. DAS181 may reduce the risk of secondary bacterial infection by inhibiting IFV.
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