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Deng S, Xie R, Kong A, Luo Y, Li J, Chen M, Wang X, Gong H, Wang L, Fan X, Pan Q, Li D. Early-life stress contributes to depression-like behaviors in a two-hit mouse model. Behav Brain Res 2023; 452:114563. [PMID: 37406776 DOI: 10.1016/j.bbr.2023.114563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 06/23/2023] [Accepted: 07/01/2023] [Indexed: 07/07/2023]
Abstract
BACKGROUND Depression is a common psychological disorder with pathogenesis involving genetic and environmental interactions. Early life stress can adversely affect physical and emotional development and dramatically increase the risk for the development of depression and anxiety disorders. METHODS To examine potential early life stress driving risk for anxiety and depression, we used a two-hit developmental stress model,injecting poly(I: C) into neonatal mice on P2-P6 followed by peripubertal unpredictable stress in adolescence. RESULTS Our study shows that early-life and adolescent stress leads to anxiety and depression-related behavioral phenotypes in male mice. Early-life stress exacerbated depression-like behavior in mice following peripubertal unpredictable stress. We confirmed that early life stress might be involved in the decreased neuronal activity in the medial prefrontal cortex (mPFC) and might be involved in shaping behavioral phenotypes of animals. We found that increased microglia and neuroinflammation in the mPFC of two-hit mice and early life stress further boost microglia activation and inflammatory factors in the mPFC region of mice following adolescent stress. LIMITATIONS The specific neural circuits and mechanisms by which microglia regulate depression-like behaviors require further investigation. CONCLUSIONS Our findings provide a novel insight into developmental risk factors and biological mechanisms in depression and anxiety disorders.
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Affiliation(s)
- Shilong Deng
- Department of Physiology, School of Basic Medical Sciences, Southwest Medical University, Luzhou 646000, China; Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University, Chongqing 400038, China
| | - Ruxin Xie
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University, Chongqing 400038, China
| | - Anqi Kong
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University, Chongqing 400038, China
| | - Yi Luo
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University, Chongqing 400038, China
| | - Jianghui Li
- Department of Physiology, School of Basic Medical Sciences, Southwest Medical University, Luzhou 646000, China
| | - Mei Chen
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University, Chongqing 400038, China
| | - Xiaqing Wang
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University, Chongqing 400038, China
| | - Hong Gong
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University, Chongqing 400038, China
| | - Lian Wang
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University, Chongqing 400038, China
| | - Xiaotang Fan
- Department of Military Cognitive Psychology, School of Psychology, Third Military Medical University, Chongqing 400038, China.
| | - Qiangwen Pan
- Department of Physiology, School of Basic Medical Sciences, Southwest Medical University, Luzhou 646000, China.
| | - Dabing Li
- Department of Physiology, School of Basic Medical Sciences, Southwest Medical University, Luzhou 646000, China.
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Li C, Yu T, Li W, Gong L, Shi J, Liu H, Yu J. PINK1 deficiency with Ca 2+ changes in the hippocampus exacerbates septic encephalopathy in mice. Chem Biol Interact 2023; 374:110413. [PMID: 36804394 DOI: 10.1016/j.cbi.2023.110413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 02/16/2023] [Accepted: 02/17/2023] [Indexed: 02/21/2023]
Abstract
PTEN-induced putative kinase 1 (PINK1) is a mitochondrial kinase that protects against oxidative stress-induced cellular death. PINK1 deletion, on the other hand, disrupts mitochondrial calcium (Ca2+) homeostasis in various brain disorders. This study looked at how PINK1 affects hippocampal intracellular Ca2+ changes in mice with septic encephalopathy. Mice were injected intraperitoneally with lipopolysaccharide (LPS, 5 mg/kg) to induce septic encephalopathy; then, fiber photometry was used to record hippocampal Ca2+ transients during behavioral tests in freely moving mice. Basal cytoplasmic Ca2+ levels were detected under a fluorescent microscope. LPS induced PINK1 expression and neuronal loss in the hippocampus of mice, whereas no difference in neuronal counts was shown between PINK1 knockout LPS mice and WT LPS mice. PINK1 deficiency led to inhibited Ca2+ transients and increased intracellular Ca2+ levels in the hippocampus of mice, thus, significantly aggravating the cognitive dysfunction in septic mice. An analysis of Parkin and PLC-γ1, downstream effectors of PINK1, showed that they are associated with the effects of PINK1. These results demonstrate that PINK1 deficiency disrupts intracellular Ca2+ homeostasis and exacerbates septic encephalopathy. This observation suggests a protective role of PINK1 in septic encephalopathy.
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Affiliation(s)
- Cui Li
- Department of Anesthesiology and Critical Care Medicine, Tianjin NanKai Hospital, Tianjin Medical University, Tianjin, 300100, China
| | - Tianyu Yu
- Tianjin Medical University, Tianjin, 300070, China
| | - Wenxing Li
- Tianjin Medical University, Tianjin, 300070, China
| | - Lirong Gong
- Department of Anesthesiology and Critical Care Medicine, Tianjin NanKai Hospital, Tianjin Medical University, Tianjin, 300100, China
| | - Jia Shi
- Department of Anesthesiology and Critical Care Medicine, Tianjin NanKai Hospital, Tianjin Medical University, Tianjin, 300100, China
| | - Huayang Liu
- Tianjin Medical University, Tianjin, 300070, China
| | - Jianbo Yu
- Department of Anesthesiology and Critical Care Medicine, Tianjin NanKai Hospital, Tianjin Medical University, Tianjin, 300100, China.
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Involvement of Midbrain Dopamine Neuron Activity in Negative Reinforcement Learning in Mice. Mol Neurobiol 2021; 58:5667-5681. [PMID: 34387814 DOI: 10.1007/s12035-021-02515-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Accepted: 08/03/2021] [Indexed: 10/20/2022]
Abstract
The activity of the midbrain dopamine system reflects the valence of environmental events and modulates various brain structures to modify an organism's behavior. A series of recent studies reported that the direct and indirect pathways in the striatum are critical for instrumental learning, but the dynamic changes in dopamine neuron activity that occur during negative reinforcement learning are still largely unclear. In the present study, by using a negative reinforcement learning paradigm employing foot shocks as aversive stimuli, bidirectional changes in substantia nigra pars compacta (SNc) dopamine neuron activity in the learning and habituation phases were observed. The results showed that in the learning phase, before mice had mastered the skill of escaping foot shocks, the presence of foot shocks induced a transient reduction in the activity of SNc dopamine neurons; however, in the habituation phase, in which the learned skill was automated, it induced a transient increase. Microinjection of a dopamine D1 receptor (D1R) or D2 receptor (D2R) antagonist into the dorsomedial striatum (DMS) significantly impaired learning behavior, suggesting that the modulatory effects of dopamine on both the direct and indirect pathways are required. Moreover, during the learning phase, excitatory synaptic transmission to DMS D2R-expressing medium spiny neurons (D2-MSNs) was potentiated. However, upon completion of the learning and habituation phases, the synapses onto D1R-expressing medium spiny neurons (D1-MSNs) were potentiated, and those onto D2-MSNs were restored to normal levels. The bidirectional changes in both SNc dopamine neuron activity and DMS synaptic plasticity might be the critical neural correlates for negative reinforcement learning.
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