Astrocytic GABAB Receptors in Mouse Hippocampus Control Responses to Behavioral Challenges through Astrocytic BDNF

Ji-Hong Liu 1 • Ze-Lin Li 1 • Yi-Si Liu 1 • Huai-De Chu1 • Neng-Yuan Hu1 • Ding-Yu Wu1 • Lang Huang1 • Shu-Ji Li1 • Xiao-Wen Li1 • Jian-Ming Yang1 • Tian-Ming Gao 1


1 State Key Laboratory of Organ Failure Research, Key Laboratory of Mental Health of the Ministry of Education, Guangdong–Hong Kong–Macao Greater Bay Area Center for Brain Science and Brain-Inspired Intelligence, Guangdong Key Laboratory of Psychiatric Disorders, Collaborative Innovation Center for Brain Science, Department of Neurobiology, School of Basic Medical Sciences, Southern Medical University, Guangzhou 510515, China

Abstract

Major depressive disorder (MDD) is a common mood disorder that affects almost 20% of the global population. In addition, much evidence has implicated altered function of the gamma-aminobutyric acid (GABAergic) system in the pathophysiology of depression. Recent research has indicated that GABAB receptors (GABABRs) are an emerging therapeutic target in the treatment of stress-related disorders such as MDD. However, which cell types with GABABRs are involved in this process is unknown. As hippocampal dysfunction is implicated in MDD, we knocked down GABABRs in the hippocampus and found that knocking down these receptors in astrocytes, but not in GABAergic or pyramidal neurons, caused a decrease in immobility in the forced swimming test (FST) without affecting other anxiety- and depression-related behaviors. We also generated astrocyte-specific GABABR-knockout mice and found decreased immobility in the FST in these mice. Furthermore, the conditional knockout of GABABRs in astrocytes selectively increased the levels of brain-derived neurotrophic factor protein in hippocampal astrocytes, which controlled the decrease in immobility in the FST. Taken together, our findings contribute to the current understanding of which cell types expressing GABABRs modulate antidepressant activity in the FST, and they may provide new insights into the pathological mechanisms and potential targets for the treatment of depression.

Keywords

Depression; Astrocyte; Gamma-aminobutyric acid receptor; Forced swimming test; Brain-derived neurotrophic factor

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