Differential Effects of Low- and High-dose Zinc Supplementation on Synaptic Plasticity and Neurogenesis in the Hippocampus of Control and High-fat Diet-fed Mice

  • Sung Min Nam
  • Jong Whi Kim
  • Hyun Jung Kwon
  • Dae Young Yoo
  • Hyo Young Jung
  • Dae Won Kim
  • In Koo Hwang
  • Je Kyung Seong
  • Yeo Sung Yoon
Original Paper

Abstract

In the present study, we investigated the concentration-dependent effect of zinc (Zn) supplementation on the adult hippocampus in a high-fat diet (HFD)-fed obese mouse model. Four-weeks after HFD- and control diet (CD)-feeding, mice were provided with low (15 ppm) or high (60 ppm) doses of Zn in their drinking water for additional 4 more weeks along with their respective diets. Compared to the CD-fed mice, HFD-feeding elicited the reduction of neurogenic markers such as nestin, Ki67, doublecortin (DCX), and 5-bromo-2′-deoxyuridine (BrdU) in the dentate gyrus. Additionally, HFD-feeding reduced the levels of synaptic markers (synaptophysin and N-methyl-d-aspartate receptor) and brain-derived neurotrophic factor (BDNF), while lipid peroxidation was significantly increased in the hippocampus of HFD-fed mice. Against detrimental effects of high-dose Zn, low-dose Zn supplementation in CD-fed mice did not yield any remarkable changes in these parameters. Interestingly, administration of low doses of Zn to HFD-induced obese mice prominently ameliorated HFD-induced changes in neurogenic, synaptic plasticity markers and BDNF levels as well as lipid peroxidation in the hippocampus. In contrast, high-dose Zn supplementation in HFD-fed mice exacerbated the reduction of markers for neurogenesis and synaptic plasticity as well as BDNF levels, but not 4-HNE levels, in the hippocampus. These results suggest that low-dose Zn supplementation in obese mice could reverse the HFD-induced reduction in neurogenic and synaptic marker proteins in the hippocampus by reducing lipid peroxidation and improving BDNF expression, while high-dose Zn supplementation exacerbates the reduction of neurogenesis by affecting synaptic markers and BDNF levels in the hippocampus.

Keywords

Zinc High-fat diet Neurogenesis Synaptic proteins Lipid peroxidation BDNF 

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  • Sung Min Nam
    • 1
    • 2
  • Jong Whi Kim
    • 1
  • Hyun Jung Kwon
    • 3
  • Dae Young Yoo
    • 1
  • Hyo Young Jung
    • 1
  • Dae Won Kim
    • 3
  • In Koo Hwang
    • 1
    • 4
  • Je Kyung Seong
    • 1
    • 4
  • Yeo Sung Yoon
    • 1
    • 4
  1. 1.Department of Anatomy and Cell Biology, College of Veterinary Medicine, and Research Institute for Veterinary ScienceSeoul National UniversitySeoulSouth Korea
  2. 2.Department of Anatomy, College of Veterinary MedicineKonkuk UniversitySeoulSouth Korea
  3. 3.Department of Biochemistry and Molecular Biology, Research Institute of Oral Sciences, College of DentistryGangneung-Wonju National UniversityGangneungSouth Korea
  4. 4.KMPC (Korea Mouse Phenotyping Center)Seoul National UniversitySeoulSouth Korea

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