Defects of parvalbumin-positive interneurons in the ventral dentate gyrus region are implicated depression-like behavior in mice.

Shijia Chen, Fengpei Chen, Nashwa Amin, Qiannan Ren, Shan Ye, Zhiying Hu, Xiaoning Tan, Mizu Jiang, Marong Fang

Brain, behavior, and immunity 2022 Jan

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Depression is an increasingly common but extremely serve mood disorder that remains poorly understood and inadequately treated. Fast-spiking parvalbumin-positive interneurons (PVIs), a subpopulation of GABAergic interneurons (GABA, g-aminobutyric acid), exhibit a widespread distribution throughout the hippocampus, and has been reported to play an important role in a variety of mental disorders. However, the relationship between depression and hippocampal PVIs remains unclear. Here in this present study, a series of experiments were conducted to clarify the potential relationship. Here, chronic unpredicted mild stress (CUMS) and Lipopolysaccharide (LPS) injection were introduced to induce depression-like behavior in mice, and led to a clear decline in PVIs numbers in the ventral hippocampal (vHPC), particularly in the ventral dentate gyrus (vDG) subfield. After a selectively removal of the PVIs in PV-ires-Cre::Ai14 mice, we confirmed that ablation of PVIs from the vDG induced depression-like behavior. Furthermore, we found that the removal of vDG-PVIs induced depression likely to be accounted for upregulation of neuroinflammation. These findings facilitate us better understand the role of hippocampal PVIs in depression. Copyright © 2021 Elsevier Inc. All rights reserved.

Citation

Shijia Chen, Fengpei Chen, Nashwa Amin, Qiannan Ren, Shan Ye, Zhiying Hu, Xiaoning Tan, Mizu Jiang, Marong Fang. Defects of parvalbumin-positive interneurons in the ventral dentate gyrus region are implicated depression-like behavior in mice. Brain, behavior, and immunity. 2022 Jan;99:27-42