TGF-β 抑制剂 SB431542 通过多步抑制抑制SARS-CoV-2 的复制
Assim Verma1, Himanshu Kamboj1,2, Garvit Kumar1
1National Centre for Veterinary Type Cultures, ICAR-National Research Centre on Equines, Hisar, India.
Journal of virology
|August 29, 2025
概括
SB431542是一种TGF-β受体抑制剂,通过向病毒的进入,聚集和释放,显示出强大的广泛抗病毒活性. 重要的是,SARS-CoV-2在50代后没有产生耐药性,这比目前的抗病毒药物具有显著优势.
科学领域:
- 病毒学
- 药物发现
- 分子生物学
背景情况:
- COVID-19 疫情凸显了具有高抗药性障碍的广泛抗病毒药物的需要.
- 传统的抗病毒药物经常面临病毒快速抗药性发展的挑战.
研究的目的:
- 调查SB431542的抗病毒潜力,它是一种TGF-β受体I (ALK5) 抑制剂,对抗SARS-CoV-2.
- 阐明SB431542对抗SARS-CoV-2的多目标机制.
- 评估SB431542的耐药性和体内疗效.
主要方法:
- 使用了体外抗病毒测定,异热定位热量测量和分析.
- 研究了SARS-CoV-2 ORF3a相互作用及其对自菌体-溶解体融合的影响.
- 对感染阶段,基因表达 (CLEAR网络,GADD45b,BAX) 和病毒标位进行了时间分析.
- 在胚胎蛋中对感染性支气管炎病毒 (IBV) 的有效性进行了实验.
- 在SB431542压力下进行了SARS-CoV-2的序列传递,以评估耐药性的发展.
主要成果:
- SB431542直接与SARS-CoV-2 ORF3a结合,破坏了 lysosomal 酸化并损害了 virion 组合.
- 该药物降低了CLEAR网络基因的调节,限制了病毒的退出,并抑制了GADD45b和BAX的表达,抑制了TGF-β诱导的亡.
- SB431542对SARS-CoV-2具有强烈的活性,EC50为751.8nM,并且在体内给予了对IBV的剂量依赖性保护.
- 在SB431542选择下传递50代SARS-CoV-2后,没有出现耐药变体.
结论:
- SB431542是一种有前途的广谱冠状病毒抑制剂,具有独特的三重机制.
- 该药物通过调节宿主病毒相互作用来准病毒的进入,聚集和释放,从而对抗性施加高的选择性约束.
- 通过克服抗病毒耐药性,SB431542代表了对抗冠状病毒,包括SARS-CoV-2的有价值的治疗策略.
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