Abstract
Many studies have shown that zinc deficiency not only retards growth, but also affects several brain functions, including learning and memory. However, the underlying mechanism of impaired hippocampus-dependent learning and memory under zinc deficiency is poorly understood. In this study, young mice were fed a zinc-deficient diet (0.85 ppm) for 5 weeks. Morris water maze result showed that zinc deficiency results in spatial learning impairment. We then examined whether zinc depletion-induced learning and memory defects are associated with changes in signaling molecules essential for the expression of long-term potentiation. Immunoblot results showed that the protein levels of calmodulin (CaM), phosphorylated CaM-dependent protein kinase II (CaMKII), and phosphorylated cAMP-responsive element binding protein (CREB) were significantly reduced, whereas the total protein levels of CaMKII and CREB did not change in the zinc-deficient hippocampus. Thus, we provide a previously unrecognized mechanism whereby zinc deficiency impairs hippocampal learning and memory, at least in part, through disruption of the CaM/CaMKII/CREB signaling pathway.
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Acknowledgments
The study was supported by the Natural Science Foundation of China (30370452, 30770680), the Program for New Century Excellent Talents in University (NCET-04-0288), the China Postdoctoral Science Foundation (2005037008), the Research Project for Universities of the Department of Education of Liaoning (20060948), and the Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP-20060159001).
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Gao, HL., Xu, H., Xin, N. et al. Disruption of the CaMKII/CREB Signaling is Associated with Zinc Deficiency-Induced Learning and Memory Impairments. Neurotox Res 19, 584–591 (2011). https://doi.org/10.1007/s12640-010-9206-y
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DOI: https://doi.org/10.1007/s12640-010-9206-y