Abstract
Cadmium (Cd) is an extensively existing environmental pollutant that has neurotoxic effects. However, the molecular mechanism of Cd on neuronal maturation is unveiled. Single-cell RNA sequencing (scRNA-seq) has been widely used to uncover cellular heterogeneity and is a powerful tool to reconstruct the developmental trajectory of neurons. In this study, neural stem cells (NSCs) from subventricular zone (SVZ) of newborn mice were treated with CdCl2 for 24 h and differentiated for 7 days to obtain neuronal lineage cells. Then scRNA-seq analysis identified five cell stages with different maturity in neuronal lineage cells. Our findings revealed that Cd altered the trajectory of maturation of neuronal lineage cells by decreasing the number of cells in different stages and hindering their maturation. Cd induced differential transcriptome expression in different cell subpopulations in a stage-specific manner. Specifically, Cd induced oxidative damage and changed the proportion of cell cycle phases in the early stage of neuronal development. Furthermore, the autocrine and paracrine signals of Wnt5a were downregulated in the low mature neurons in response to Cd. Importantly, activation of Wnt5a effectively rescued the number of neurons and promoted their maturation. Taken together, the findings of this study provide new and comprehensive insights into the adverse effect of Cd on neuronal maturation.
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Acknowledgements
Thanks to NovelBio Bio-Pharm Technology Co., Ltd. (Shanghai, China) for assistance with single-cell RNA sequencing and data visualization. The authors are grateful to PhD. Lin Jia of the University of Texas at Dallas for writing assistance.
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This work was funded by the Shanghai Municipal Health Commission (GWV-10.1-XK11).
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Bo Song: data curation, writing original draft preparation, and visualization; Yuwei Zhang: data curation, writing, reviewing, and editing; Guiya Xiong: data curation, reviewing, and editing; Huna Luo: visualization, writing, reviewing, and editing; Bing Zhang: reviewing and editing; Yixi Li: methodology; Zhibin Wang and Zhijun Zhou: supervision, validation, and conceptualization; Xiuli Chang: reviewing, methodology, supervision, and validation.
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Song, B., Zhang, Y., Xiong, G. et al. Single-cell transcriptomic analysis reveals the adverse effects of cadmium on the trajectory of neuronal maturation. Cell Biol Toxicol 39, 1697–1713 (2023). https://doi.org/10.1007/s10565-022-09775-5
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DOI: https://doi.org/10.1007/s10565-022-09775-5