Abstract
The overproduction of neurotoxic amyloid-β (Aβ) peptides in the brain is a hallmark of Alzheimer’s disease (AD). To determine the role of intracellular zinc ion (iZn2+) dysregulation in mediating Aβ-related neurotoxicity, this study aimed to investigate whether N, N, N′, N′‑tetrakis (2‑pyridylmethyl) ethylenediamine (TPEN), a Zn2+‑specific chelator, could attenuate Aβ25–35‑induced neurotoxicity and the underlying mechanism. We used the 3-(4, 5-dimethyl-thiazol-2-yl)-2, 5-diphenyltetrazolium bromide assay to measure the viability of primary hippocampal neurons. We also determined intracellular Zn2+ and Ca2+ concentrations, mitochondrial and lysosomal functions, and intracellular reactive oxygen species (ROS) content in hippocampal neurons using live-cell confocal imaging. We detected L-type voltage-gated calcium channel currents (L-ICa) in hippocampal neurons using the whole‑cell patch‑clamp technique. Furthermore, we measured the mRNA expression levels of proteins related to the iZn2+ buffer system (ZnT-3, MT-3) and voltage-gated calcium channels (Cav1.2, Cav1.3) in hippocampal neurons using RT-PCR. The results showed that TPEN attenuated Aβ25–35‑induced neuronal death, relieved the Aβ25–35‑induced increase in intracellular Zn2+ and Ca2+ concentrations; reversed the Aβ25–35‑induced increase in ROS content, the Aβ25–35‑induced increase in the L-ICa peak amplitude at different membrane potentials, the Aβ25–35‑induced the dysfunction of the mitochondria and lysosomes, and the Aβ25–35‑induced decrease in ZnT-3 and MT-3 mRNA expressions; and increased the Cav1.2 mRNA expression in the hippocampal neurons. These results suggest that TPEN, the Zn2+-specific chelator, attenuated Aβ25–35‑induced neuronal damage, correlating with the recovery of intracellular Zn2+ and modulation of abnormal Ca2+-related signaling pathways.
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This work was supported by grants from the National Natural Science Foundation of China (31272317), the National Nature Science Youth Foundation of China (81801076), the Natural Science Foundation of Tianjin City (20JCYBJC01370), Natural Science Foundation of Tianjin City (15JCYBJC24500), the Tianjin Natural Science Youth Foundation (18JCQNJC11400), the Fundamental Research Funds for the Central Universities of Nankai University (BE123081), and the Natural Science Foundation of Hebei Province (C2020423055).
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W.B.C. designed and performed the experiments, analyzed the experimental data, prepared all figures, and wrote the manuscript. Y.Q.L. conceived the study, reviewed and revised the manuscript. The other authors help to perform the experiments, collect experimental data, review and revise the manuscript, and apply the funds. All the authors reviewed the manuscript.
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Chen, Wb., Wang, Yx., Wang, Hg. et al. Role of TPEN in Amyloid-β25–35-Induced Neuronal Damage Correlating with Recovery of Intracellular Zn2+ and Intracellular Ca2+ Overloading. Mol Neurobiol 60, 4232–4245 (2023). https://doi.org/10.1007/s12035-023-03322-x
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DOI: https://doi.org/10.1007/s12035-023-03322-x