评估一个in vivo肺阿斯珀吉洛斯病模型,用于测定三醇敏感性发展断点
Alex Lepak1, Sujata M Bhavnani2, Mariana Castanheira3
1University of Wisconsin, Madison, Wisconsin, USA.
Antimicrobial agents and chemotherapy
|January 30, 2026
概括
鼠标感染模型有助于设计抗微生物剂量. 确定与临床成功相关的终点是关键. 这项研究验证了阿斯伯吉勒斯烟草的波萨可纳断点,确定有效治疗的MIC值为≤0.5 mg/L.
科学领域:
- 医学真菌学 医学真菌学
- 传染性疾病 传染性疾病
- 药理动力学/药理动力学
背景情况:
- 鼠标感染模型对于抗微生物药理动力学/药理动力学 (PK/PD) 分析至关重要,有助于剂量方案设计和敏感性断点的开发.
- 将体内研究结果转化为临床实践的一个重大挑战是定义与临床成功相关的模型终点.
- 验证体内终点需要临床数据,将治疗结果 (成功/失败) 与最小抑制度 (MIC),剂量方案和人类药理动力学的测量联系起来.
研究的目的:
- 定义在小鼠肺炎模型中的体内终点,用于用波萨可纳治疗.
- 为了验证Aspergillus fumigatus感染的已确定的药理动力学/药理动力学 (PK/PD) 目标的临床效用.
- 根据波萨可纳PK/PD标,确定阿斯伯吉拉斯烟草的敏感性断点.
主要方法:
- 在小鼠肺炎模型中使用了一个由八种Aspergillus fumigatus菌株 (野生型和耐药突变) 组成的小组.
- 向受感染的小鼠提供人性化的波萨可纳剂量方案.
- 确定了度-时间曲线下的波萨可纳自由药物面积与与静止终点相关的MIC (AUC/MIC) 的比率.
主要成果:
- 人性化的波萨可纳暴露使野生型菌株的真菌负担实现停滞或减少.
- 对于具有较高MIC和Cyp51突变的菌株,尽管接受了治疗,但观察到菌株的真菌负担增加.
- 模拟表明,在Aspergillus fumigatus菌株中,PK/PD目标的实现概率高于90%,MIC ≤0.5 mg/L.
结论:
- 在小鼠模型中,与静止终点相关的波萨可纳AUC/MIC比率可以预测治疗成功.
- 最低抑制度 (MIC) 断点≤0.5 mg/L是支持阿斯伯吉勒斯烟虫对波萨可纳的敏感性.
- 这项研究为验证体内模型和确定抗真菌疗法的临床断点提供了一个框架.
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