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A metabolomics study: CdTe/ZnS quantum dots induce polarization in mice microglia
Keyu He1, Xue Liang2, Tingting Wei2
1Key Laboratory of Environmental Medicine and Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, Jiangsu, China; Blood Transfusion Department, Zhongda Hospital, Southeast University, Nanjing, Jiangsu, China.
Chemosphere
|January 14, 2020
Summary
Cadmium telluride/zinc sulfide quantum dots (CdTe/ZnS QDs) trigger neurotoxicity by polarizing microglia, leading to inflammation and neuronal damage. These findings highlight potential risks for brain imaging applications.
Area of Science:
- Neuroscience
- Toxicology
- Materials Science
Background:
- Quantum dots (QDs) are increasingly used in biomedical imaging, but their neurotoxic potential requires thorough investigation.
- Microglia, the brain's immune cells, play a critical role in neuroinflammation and neuronal health.
- Understanding the interaction between QDs and microglia is crucial for assessing safety in neurological applications.
Purpose of the Study:
- To elucidate the neurotoxic mechanisms of Cadmium telluride/zinc sulfide quantum dots (CdTe/ZnS QDs).
- To investigate the role of microglia polarization in mediating CdTe/ZnS QD neurotoxicity.
- To assess the safety of CdTe/ZnS QDs for potential use in brain tissue imaging.
Main Methods:
- Metabolomic analysis using gas chromatography-mass spectrometry (GC-MS) on BV-2 microglia cells exposed to CdTe/ZnS QDs.
- Metabolic profiling using Seahorse XFe96 Analyzer to assess glycolysis and aerobic respiration.
- In vivo studies in mice involving tail vein injection of CdTe/ZnS QDs and ex vivo analysis of hippocampal tissue.
- In vitro assessment of inflammatory markers (TNF-α, IL-1β, NO) and neuronal viability (HT-22 cells) after CdTe/ZnS QD exposure.
Main Results:
- CdTe/ZnS QD exposure significantly altered 11 metabolic pathways in microglia, including those related to glucose metabolism.
- Microglia exposed to CdTe/ZnS QDs exhibited an 86% increase in glycolysis and a 54% decrease in aerobic respiration.
- In vivo studies showed peak CdTe/ZnS QD concentration in the hippocampus 3 hours post-injection, correlating with a 2.7-fold increase in microglia polarization.
- In vitro exposure led to elevated inflammatory markers and a significant reduction in neuronal viability.
Conclusions:
- CdTe/ZnS QDs induce neurotoxicity primarily through microglia polarization, triggering secondary inflammatory damage to neurons.
- The observed metabolic shifts in microglia, particularly altered glucose metabolism, contribute to the neurotoxic effects.
- These findings suggest potential risks associated with the application of CdTe/ZnS QDs in brain imaging, necessitating further safety evaluations.
