轴向O原子调制Fe(III) -N4 增强级联催化1O2-诱导瘤治疗的地点
Hongji Liu1,2, Biao Yu1,3,4, Pengqi Yang1
1High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China.
概括
这项研究引入了一种新的O-Fe-N4纳米催化剂,可以在没有外部能量的情况下为瘤治疗产生单片氧 (1O2). 它模仿谷氨氧化酶活性,通过克服谷氨抑制来增强抗癌疗效.
科学领域:
- 纳米催化剂的使用方法
- 生物医学工程 生物医学工程
- 材料科学 材料科学 材料科学
背景情况:
- 开发低氧耐受性纳米催化剂用于单片氧 (1O2) 生成,对于有效的瘤治疗至关重要.
- 现有的方法通常需要外部刺激,或者受到瘤微环境因素 (如谷氨) 的阻碍.
- 石墨碳化物量子点为催化剂固定提供了一个有前途的生物相容平台.
研究的目的:
- 开发一种新型的低氧耐受纳米催化剂,用于用于癌症治疗的自我刺激单片氧 (1O2) 生成.
- 研究由轴向O原子 (O-Fe-N4) 调节的Fe-N4部分的催化机制和效率.
- 评估催化剂克服谷氨抑制和增强抗癌功效的能力.
主要方法:
- 石墨碳化物量子点的合成与轴向O原子调制的Fe-N4部分 (O-Fe-N4) 固定.
- 描述O-Fe-N4催化剂的结构和特性.
- 通过拉塞尔反应对H2O2转化为1O2的催化活性和氨酸氧化酶模仿活性的评估.
- 在体外评估抗癌疗效,包括抑制瘤增殖和调节相关酶活性.
- 密度函数理论 (DFT) 计算以阐明催化机制.
主要成果:
- 在没有外部能量输入的情况下,O-Fe-N4纳米催化剂通过拉塞尔反应有效地将H2O2转化为1O2.
- 催化剂表现出显著的谷氨氧化酶模仿活性,为1O2生成提供基质,克服谷氨抑制.
- 与之前报告的Fe-N4催化剂相比,O-Fe-N4表现出更高的特异活性 (79.58U mg-1在pH 6.2) .
- DFT计算证实,轴向的O原子优化了Fe-N电子结构,降低了激活能量,提高了拉塞尔反应的选择性.
- 催化剂通过降低谷氨过氧化酶4活性并诱导脂质过氧化,有效地抑制瘤增殖.
结论:
- 开发的O-Fe-N4纳米催化剂在1O2涉及的癌症治疗中代表了一种有效的自我级联催化平台.
- 这项工作为通过结构调节来提高Fe-N4催化剂性能提供了一个范式,解决了当前癌症疗法的局限性.
- 催化剂的低氧耐受性和克服瘤微环境挑战的能力为改善治疗结果提供了一个有希望的策略.
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