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Published on: May 22, 2019
Unraveling the Pathogenesis of Post-Stroke Depression in a Hemorrhagic Mouse Model through Frontal Lobe Circuitry and
Yingqing Wu1, Jia Deng2, Jinsong Ma1
1Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing, 400030, China.
Insights
Post-stroke depression linked to frontal lobe hemorrhage involves disrupted brain circuitry and neuronal changes. Targeting the Janus Kinase-Signal Transducer and Activator of Transcription (JAK-STAT) pathway effectively reduces depressive symptoms.
Area of Science:
- Neuroscience
- Molecular Biology
- Pathology
Background:
- Post-stroke depression (PSD) is a frequent complication impacting patient recovery.
- The precise mechanisms linking frontal lobe hemorrhage to depression are not fully understood.
Purpose of the Study:
- To investigate the pathogenic mechanisms of depression following frontal lobe hemorrhage in a mouse model.
- To explore circuitry, electrophysiological, and molecular changes in the medial prefrontal cortex (mPFC).
Main Methods:
- Induction of unilateral hematoma in the mPFC of adult male mice.
- Analysis of brain circuitry connectivity (VTA, LHb, STR).
- Electrophysiological recordings and transcriptomic analysis (JAK-STAT pathway).
Main Results:
- Depression was confirmed as a neurological complication in the mPFC hematoma model.
- Ventral tegmental area (VTA) showed significant connectivity disruption.
- Reduced neuronal excitability and altered synaptic communication in mPFC neurons were observed.
- The Janus Kinase-Signal Transducer and Activator of Transcription (JAK-STAT) pathway was implicated.
Conclusions:
- Frontal lobe hemorrhage disrupts specific brain circuits, leading to depression.
- Targeting the JAK-STAT pathway offers a potential therapeutic strategy for post-hemorrhagic depression.
Abstract:
Post-stroke depression is a common complication that imposes significant burdens and challenges on patients. The occurrence of depression is often associated with frontal lobe hemorrhage, however, current understanding of the underlying mechanisms remains limited. Here, the pathogenic mechanisms associated with the circuitry connectivity, electrophysiological alterations, and molecular characteristics are investigated related to the frontal lobe in adult male mice following unilateral injection of blood in the medial prefrontal cortex (mPFC). It is demonstrated that depression is a specific neurological complication in the unilateral hematoma model of the mPFC, and the ventral tegmental area (VTA) shows a higher percentage of connectivity disruption compared to the lateral habenula (LHb) and striatum (STR). Additionally, long-range projections originating from the frontal lobe demonstrate higher damage percentages within the connections between each region and the mPFC. mPFC neurons reveal reduced neuronal excitability and altered synaptic communication. Furthermore, transcriptomic analysis identifies the involvement of the Janus Kinase-Signal Transducer and Activator of Transcription (JAK-STAT) signaling pathway, and targeting the JAK-STAT pathway significantly alleviates the severity of depressive symptoms. These findings improve the understanding of post-hemorrhagic depression and may guide the development of efficient treatments.
