Original Article | Published:

Forebrain-specific ablation of phospholipase Cγ1 causes manic-like behavior

Molecular Psychiatry volume 22, pages 14731482 (2017) | Download Citation

Abstract

Manic episodes are one of the major diagnostic symptoms in a spectrum of neuropsychiatric disorders that include schizophrenia, obsessive-compulsive disorder and bipolar disorder (BD). Despite a possible association between BD and the gene encoding phospholipase Cγ1 (PLCG1), its etiological basis remains unclear. Here, we report that mice lacking phospholipase Cγ1 (PLCγ1) in the forebrain (Plcg1f/f; CaMKII) exhibit hyperactivity, decreased anxiety-like behavior, reduced depressive-related behavior, hyperhedonia, hyperphagia, impaired learning and memory and exaggerated startle responses. Inhibitory transmission in hippocampal pyramidal neurons and striatal dopamine receptor D1-expressing neurons of Plcg1-deficient mice was significantly reduced. The decrease in inhibitory transmission is likely due to a reduced number of γ-aminobutyric acid (GABA)-ergic boutons, which may result from impaired localization and/or stabilization of postsynaptic CaMKII (Ca2+/calmodulin-dependent protein kinase II) at inhibitory synapses. Moreover, mutant mice display impaired brain-derived neurotrophic factor-tropomyosin receptor kinase B-dependent synaptic plasticity in the hippocampus, which could account for deficits of spatial memory. Lithium and valproate, the drugs presently used to treat mania associated with BD, rescued the hyperactive phenotypes of Plcg1f/f; CaMKII mice. These findings provide evidence that PLCγ1 is critical for synaptic function and plasticity and that the loss of PLCγ1 from the forebrain results in manic-like behavior.

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Acknowledgements

This work was supported by a National Research Foundation of Korea (NRF) Grant, funded by the Korean Government (MOE) (2013R1A1A2064434) and a grant by the Korean Government (MSIP) (2010-0028684 and 2007-341-C00027; to P-GS), and by NRF Grants (2014051826, 2015R1A2A1A15054037 and 2015M3C7A1027351; to J-HK). We thank MP Kong at POSTECH for supporting generation of PLCγ1 conditional knockout mice, YH Lee at UNIST for maintaining mice and technical support, JH Hur at UNIST-Olympus Biomedical imaging Center (UOBC) for technical support and M Suh at the Korea Institute of Science and Technology (KIST) for experimental support for the behavior test. We also thank CH Bailey (Neuroscience, Columbia University) for critical reading and comments.

Author information

Author notes

    • Y R Yang
    •  & J H Jung

    The first two authors contributed equally to this work.

Affiliations

  1. School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea

    • Y R Yang
    • , E-K Kim
    • , H-J Jang
    • , D-S Kang
    • , J H Choi
    •  & P-G Suh
  2. Aging Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, Republic of Korea

    • Y R Yang
  3. Department of Life Sciences, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea

    • J H Jung
    • , S-J Kim
    • , H J Kim
    • , J H Lee
    • , O-B Kwon
    • , S H Ryu
    •  & J-H Kim
  4. Division of Cancer Genetics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan

    • K Hamada
    •  & A Suzuki
  5. Department of Psychology, Korea University, Seoul, Republic of Korea

    • Y K Lee
    •  & J-S Choi
  6. Center for Functional Connectomics, and Center for Neural Science, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea

    • J Kim
    • , C J Lee
    •  & H-Y Koh
  7. Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, RI, USA

    • J Marshall
  8. Department of Physiology, College of Medicine, Kyung Hee University, Seoul, Republic of Korea

    • C-J Kim
  9. Department of Biomedical Engineering, Jungwon University, Goesan, Republic of Korea

    • H Seok
  10. Department of Psychiatry, Dongguk University International Hospital, Goyang, Republic of Korea

    • S H Kim
  11. Department of Psychiatry, College of Physicians and Surgeons of Columbia University, New York, NY, USA

    • Y-B Choi
  12. Cellular Signaling Laboratory, Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy

    • L Cocco

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DOI

https://doi.org/10.1038/mp.2016.261

Supplementary Information accompanies the paper on the Molecular Psychiatry website (http://www.nature.com/mp)

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