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Forebrain-specific ablation of phospholipase Cγ1 causes manic-like behavior
Y R Yang1,2, J H Jung3, S-J Kim3
1School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea.
Molecular Psychiatry
|February 1, 2017
Summary
Phospholipase Cγ1 (PLCγ1) loss in the forebrain causes manic-like behaviors in mice. This study reveals PLCγ1
Area of Science:
- Neuroscience
- Molecular Biology
- Psychiatry
Background:
- Manic episodes are key symptoms in neuropsychiatric disorders like bipolar disorder (BD).
- The role of phospholipase Cγ1 (PLCγ1) in BD etiology is unclear.
- Previous studies suggest a potential association between BD and the PLCG1 gene.
Purpose of the Study:
- To investigate the role of phospholipase Cγ1 (PLCγ1) in the forebrain.
- To understand the etiological basis of manic episodes linked to PLCG1.
- To explore the impact of PLCγ1 deficiency on behavior and synaptic function.
Main Methods:
- Generated forebrain-specific PLCγ1-deficient mice (Plcg1f/f; CaMKII).
- Assessed behavioral phenotypes including hyperactivity, anxiety, and learning.
- Examined inhibitory neurotransmission, synaptic plasticity, and drug rescue effects.
Main Results:
- PLCγ1-deficient mice exhibited hyperactivity, reduced anxiety and depression-related behaviors, hyperhedonia, hyperphagia, impaired learning/memory, and exaggerated startle.
- Reduced inhibitory transmission in hippocampal and striatal neurons was observed, linked to fewer GABAergic boutons and impaired CaMKII localization.
- Impaired BDNF-TrkB-dependent synaptic plasticity in the hippocampus correlated with spatial memory deficits.
Conclusions:
- Forebrain PLCγ1 is crucial for normal synaptic function and plasticity.
- Loss of PLCγ1 in the forebrain leads to manic-like behaviors.
- Lithium and valproate treatment rescued the observed hyperactive phenotypes.
