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Brain Structure and Function

, Volume 220, Issue 4, pp 2209–2221 | Cite as

Dietary magnesium restriction reduces amygdala–hypothalamic GluN1 receptor complex levels in mice

  • Maryam Ghafari
  • Nigel Whittle
  • András G. Miklósi
  • Caroline Kotlowsky
  • Claudia Schmuckermair
  • Johannes Berger
  • Keiryn L. Bennett
  • Nicolas Singewald
  • Gert LubecEmail author
Original Article

Abstract

Reduced daily intake of magnesium (Mg2+) is suggested to contribute to depression. Indeed, preclinical studies show dietary magnesium restriction (MgR) elicits enhanced depression-like behaviour establishing a causal relationship. Amongst other mechanisms, Mg2+ gates the activity of N-methyl-d-asparte (NMDA) receptors; however, it is not known whether reduced dietary Mg2+ intake can indeed affect brain NMDA receptor complexes. Thus, the aim of the current study was to reveal whether MgR induces changes in brain NMDA receptor subunit composition that would indicate altered NMDA receptor regulation. The results revealed that enhanced depression-like behaviour elicited by MgR was associated with reduced amygdala–hypothalamic protein levels of GluN1-containing NMDA complexes. No change in GluN1 mRNA levels was observed indicating posttranslational changes were induced by dietary Mg2+ restriction. To reveal possible protein interaction partners, GluN1 immunoprecipitation and proximity ligation assays were carried out revealing the expected GluN1 subunit association with GluN2A, GluN2B, but also novel interactions with GluA1, GluA2 in addition to known downstream signalling proteins. Chronic paroxetine treatment in MgR mice normalized enhanced depression-like behaviour, but did not alter protein levels of GluN1-containing NMDA receptors, indicating targets downstream of the NMDA receptor. Collectively, present data demonstrate that dietary MgR alters brain levels of GluN1-containing NMDA receptor complexes, containing GluN2A, GluN2B, AMPA receptors GluA1, GluA2 and several protein kinases. These data indicate that the modulation of dietary Mg2+ intake may alter the function and signalling of this receptor complex indicating its involvement in the enhanced depression-like behaviour elicited by MgR.

Keywords

NMDA Receptor complexes Dietary magnesium restriction Depression Forced swim test Amygdala Hypothalamus 

Notes

Acknowledgments

This work was funded partially by the Austrian Science Fund (FWF): P22931-B18 (to NS and GL), W 1206-B18 SPIN (to NS) and partially sponsored by the Verein zur Durchführung der wissenschaftlichen Forschung auf dem Gebiet der Neonatologie und Kinder intensiv Medizin.

Supplementary material

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Maryam Ghafari
    • 1
  • Nigel Whittle
    • 2
  • András G. Miklósi
    • 1
  • Caroline Kotlowsky
    • 1
  • Claudia Schmuckermair
    • 2
  • Johannes Berger
    • 3
  • Keiryn L. Bennett
    • 4
  • Nicolas Singewald
    • 2
  • Gert Lubec
    • 1
    Email author
  1. 1.Department of PediatricsMedical University of ViennaViennaAustria
  2. 2.Department of Pharmacology and Toxicology and Center for Molecular BiosciencesUniversity of InnsbruckInnsbruckAustria
  3. 3.Department of Pathobiology of the Nervous System, Center for Brain ResearchMedical University of ViennaViennaAustria
  4. 4.CeMM Research Center for Molecular Medicine of the Austrian Academy of SciencesViennaAustria

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