MCU knockdown in hippocampal neurons improves memory performance of an Alzheimer's disease mouse model
Hongyan Cai1,2,3, Jing Qiao1, Siru Chen1
1Department of Microbiology and Immunology, Shanxi Medical University, Taiyuan 030001, China.
Abstract:
Alzheimer's disease (AD) is a progressive and degenerative disorder accompanied by cognitive decline, which could be promoted by mitochondrial dysfunction induced by mitochondrial Ca 2+ (mCa 2+) homeostasis Mitochondrial calcium uniporter (MCU), a key channel of mCa 2+ uptake, may be a target for AD treatment. In the present study, we reveal for the first time that MCU knockdown in hippocampal neurons improves the memory performance of APP/PS1/tau mice through radial arm maze task. Western blot analysis, transmission electron microscopy (TEM), Golgi staining, immunohistochemistry (IHC) and ELISA results demonstrate that MCU knockdown in hippocampal neurons upregulates the levels of postsynaptic density protein 95 (PSD95) and synaptophysin (SYP), and increases the numbers of synapses and dendritic spines. Meanwhile, MCU knockdown in hippocampal neurons decreases the neuroinflammatory response induced by astrogliosis and high levels of IL-1β and TNF-α, and improves the PINK1-Parkin mitophagy signaling pathway and increases the level of Beclin-1 but decreases the level of P62. In addition, MCU knockdown in hippocampal neurons recovers the average volume and number of mitochondria. These data confirm that MCU knockdown in hippocampal neurons improves the memory performance of APP/PS1/tau mice through ameliorating the synapse structure and function, relieving the inflammation response and recovering mitophagy, indicating that MCU inhibition has the potential to be developed as a novel therapy for AD.
Insights
Inhibition of the mitochondrial calcium uniporter (MCU) in brain cells improved memory in Alzheimer
Area of Science:
- Neuroscience
- Mitochondrial Biology
- Neurodegenerative Diseases
Background:
- Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by cognitive decline.
- Mitochondrial dysfunction, particularly impaired mitochondrial calcium (mCa2+) homeostasis, is implicated in AD pathogenesis.
- The mitochondrial calcium uniporter (MCU) regulates mCa2+ uptake and is a potential therapeutic target for AD.
Purpose of the Study:
- To investigate the therapeutic potential of targeting the MCU in Alzheimer's disease.
- To determine the effects of MCU knockdown in hippocampal neurons on memory performance and neuropathological hallmarks in a mouse model of AD.
Main Methods:
- Utilized APP/PS1/tau transgenic mice, a model for Alzheimer's disease.
- Performed MCU knockdown specifically in hippocampal neurons.
- Assessed memory performance using the radial arm maze task.
- Employed Western blot, transmission electron microscopy (TEM), Golgi staining, immunohistochemistry (IHC), and ELISA to evaluate synaptic structure, neuroinflammation, mitophagy, and mitochondrial morphology.
Main Results:
- MCU knockdown in hippocampal neurons significantly improved memory performance in APP/PS1/tau mice.
- Synaptic plasticity markers (PSD95, SYP), synapse numbers, and dendritic spine density were upregulated following MCU knockdown.
- Neuroinflammation, indicated by reduced astrogliosis and lower levels of IL-1β and TNF-α, was decreased.
- Mitophagy pathways (PINK1-Parkin, Beclin-1, P62) were favorably modulated, and mitochondrial volume and number were restored.
Conclusions:
- Targeting the MCU by knockdown in hippocampal neurons ameliorates cognitive deficits in an AD mouse model.
- MCU inhibition improves synaptic structure and function, reduces neuroinflammation, and restores mitochondrial health and mitophagy.
- Inhibition of MCU presents a promising novel therapeutic strategy for Alzheimer's disease.
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