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Polystyrene nanoplastics induce lipophagy via the AMPK/ULK1 pathway and block lipophagic flux leading to lipid accumulation in hepatocytes.
Fan, Zhuying; Zhang, Yukang; Fang, Yuting; Zhong, Huiyuan; Wei, Tingting; Akhtar, Huraira; Zhang, Jiahuai; Yang, Man; Li, Yanbo; Zhou, Xianqing; Sun, Zhiwei; Wang, Ji.
Affiliation
  • Fan Z; Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China.
  • Zhang Y; Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Shanxi Provincial Center for Disease Control and Prevention, Taiyuan 030012, Shanxi, China.
  • Fang Y; Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China.
  • Zhong H; Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China.
  • Wei T; Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China.
  • Akhtar H; Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China.
  • Zhang J; Center for Clinical Laboratory, Capital Medical University, Beijing 100069, China.
  • Yang M; Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China.
  • Li Y; Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China.
  • Zhou X; Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China.
  • Sun Z; Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China.
  • Wang J; Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, China. Electronic address: wangji@ccmu.edu.cn.
J Hazard Mater ; 476: 134878, 2024 Sep 05.
Article in En | MEDLINE | ID: mdl-38897115
ABSTRACT
Micro- and nanoplastic pollution has emerged as a significant global concern due to their extensive presence in the environment and potential adverse effects on human health. Nanoplastics can enter the human circulatory system and accumulate in the liver, disrupting hepatic metabolism and causing hepatotoxicity. However, the precise mechanism remains uncertain. Lipophagy is an alternative mechanism of lipid metabolism involving autophagy. This study aims to explore how polystyrene nanoplastics (PSNPs) influence lipid metabolism in hepatocytes via lipophagy. Initially, it was found that PSNPs were internalized by human hepatocytes, resulting in decreased cell viability. PSNPs were found to induce the accumulation of lipid droplets (LDs), with autophagy inhibition exacerbating this accumulation. Then, PSNPs were proved to activate lipophagy by recruiting LDs into autophagosomes and block the lipophagic flux by impairing lysosomal function, inhibiting LD degradation. Ultimately, PSNPs were shown to activate lipophagy through the AMPK/ULK1 pathway, and knocking down AMPK exacerbated lipid accumulation in hepatocytes. Overall, these results indicated that PSNPs triggered lipophagy via the AMPK/ULK1 pathway and blocked lipophagic flux, leading to lipid accumulation in hepatocytes. Thus, this study identifies a novel mechanism underlying nanoplastic-induced lipid accumulation, providing a foundation for the toxicity study and risk assessments of nanoplastics.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Polystyrenes / Autophagy / Hepatocytes / Lipid Metabolism / AMP-Activated Protein Kinases / Autophagy-Related Protein-1 Homolog Limits: Humans Language: En Journal: J Hazard Mater Journal subject: SAUDE AMBIENTAL Year: 2024 Document type: Article Affiliation country: China
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Polystyrenes / Autophagy / Hepatocytes / Lipid Metabolism / AMP-Activated Protein Kinases / Autophagy-Related Protein-1 Homolog Limits: Humans Language: En Journal: J Hazard Mater Journal subject: SAUDE AMBIENTAL Year: 2024 Document type: Article Affiliation country: China