动力学分析表明,在环境暴露较低的情况下,马拉对人类来说是无毒的
Lawrence M Schopfer1, Ozden Tacal2, Patrick Masson3
1Eppley Institute, University of Nebraska Medical Center, Nebraska Medical Center, Omaha, Nebraska, United States of America.
PloS one
|October 24, 2025
概括
马拉在低剂量下是安全的,因为人体雌激酶迅速将其排毒成无毒的形式. 毒性代谢物malaoxon的产生缓慢,防止乙胆酶抑制和胆毒性毒性.
科学领域:
- 环境科学 环境科学
- 毒理学 毒理学 毒理学
- 生物化学 生物化学
背景情况:
- 马拉被广泛用作杀虫剂,以安全性而闻名.
- 没有报告过低剂量环境马拉暴露导致胆性毒性的病例.
- 了解马拉的排毒机制是解释其安全性概况的关键.
研究的目的:
- 阐明马拉在低环境剂量下安全的机制.
- 调查人类雌激酶在马拉排毒中的作用.
- 为了比较马拉排毒与毒性激活的速率.
主要方法:
- 利用高性能液态染色学 (HPLC) 和质谱学 (MS) 来监测马拉脱碳化.
- 使用复合人类乙胆化酶 (rHuAChE),人类丁胆化酶 (HuBChE) 和复合人类肝脏化酶 (rHuCE1) 的测试酶抑制.
- 使用先进的染色学和质谱技术确定了马拉代谢物和微量污染物.
主要成果:
- 负电荷的脱碳酸马拉没有抑制rHuAChE,HuBChE或rHuCE1.
- 人类的碳氧化酶 (rHuCE1) 排毒马拉提安的速度是rHuAChE和HuBChE的10万倍.
- 毒性代谢物malaoxon的产生速度缓慢,而马拉酸的快速排毒发生.
结论:
- 马拉在低剂量的安全性归因于快速排毒超过缓慢的毒性激活.
- 排毒的马拉酸迅速形成,防止抑制乙胆酶.
- 没有令人信服的证据支持低剂量马拉暴露导致癌症.
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