Bafi A1 inhibits nano-copper oxide-induced mitochondrial damage by reducing the release of copper from lysosomes.

Zhi Huang, Mo Lin, Lei Wang, Liangding Dou, Xin Hou, Jinwen Zhang, Yongchao Huang, Lifang Wei, Ran An, Dai Wang, Youliang Yao, Dongbei Guo, Zhibo Li, Yongxing Zhang

Journal of applied toxicology : JAT 2024 Aug

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This study demonstrated that both copper oxide nanoparticles (CuO-NPs) and copper nanoparticles (Cu-NPs) can cause swelling, inflammation, and cause damage to the mitochondria of alveolar type II epithelial cells in mice. Cellular examinations indicated that both CuO-NPs and Cu-NPs can reduce cell viability and harm the mitochondria of human bronchial epithelial cells, particularly Beas-2B cells. However, it is clear that CuO-NPs exhibit a more pronounced detrimental effect compared with Cu-NPs. Using bafilomycin A1 (Bafi A1), an inhibitor of lysosomal acidification, was found to enhance cell viability and alleviate mitochondrial damage caused by CuO-NPs. Additionally, Bafi A1 also reduces the accumulation of dihydrolipoamide S-acetyltransferase (DLAT), a marker for mitochondrial protein toxicity, induced by CuO-NPs. This observation suggests that the toxicity of CuO-NPs depends on the distribution of copper particles within cells, a process facilitated by the acidic environment of lysosomes. The release of copper ions is thought to be triggered by the acidic conditions within lysosomes, which aligns with the lysosomal Trojan horse mechanism. However, this association does not seem to be evident with Cu-NPs. © 2024 John Wiley & Sons Ltd.

Citation

Zhi Huang, Mo Lin, Lei Wang, Liangding Dou, Xin Hou, Jinwen Zhang, Yongchao Huang, Lifang Wei, Ran An, Dai Wang, Youliang Yao, Dongbei Guo, Zhibo Li, Yongxing Zhang. Bafi A1 inhibits nano-copper oxide-induced mitochondrial damage by reducing the release of copper from lysosomes. Journal of applied toxicology : JAT. 2024 Aug;44(8):1257-1268