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Cholinergic Senescence in the Ts65Dn Mouse Model for Down Syndrome
Martina Kirstein1, Alba Cambrils1, Ana Segarra1
1Cell Biology Department, Universitat de València, Dr. Moliner, 50, Burjassot, 46100, València, Spain.
Neurochemical Research
|June 29, 2022
Summary
Down syndrome (DS) accelerates brain aging and neuronal loss, particularly in the Ts65Dn mouse model. Early senescence in cholinergic neurons contributes to this progressive loss, offering insights into Alzheimer's disease development.
Area of Science:
- Neuroscience
- Genetics
- Aging Research
Background:
- Down syndrome (DS) is associated with intellectual disabilities, accelerated aging, and early-onset Alzheimer's disease (AD).
- Cholinergic neuron loss is a key feature of AD in both DS and the Ts65Dn mouse model, a widely used DS model.
- Understanding the mechanisms behind neuronal loss in DS is crucial for developing therapeutic strategies.
Purpose of the Study:
- To quantify cholinergic neuron numbers in control and Ts65Dn mice across different ages.
- To investigate the molecular mechanisms, including senescence, underlying cholinergic neuron loss in the Ts65Dn model.
- To explore the role of m1 muscarinic receptor expression in mitigating neuronal loss.
Main Methods:
- Comparative analysis of cholinergic neuron counts in Ts65Dn and control mice.
- Assessment of gene expression (c-fos, β-galactosidase) and protein localization (FOXO1) in neuronal populations.
- Evaluation of m1 muscarinic receptor expression in the hippocampus.
Main Results:
- A general age-dependent reduction in cholinergic neurons was observed, with a more significant loss in aged Ts65Dn mice.
- Ts65Dn mice exhibited increased expression of c-fos and β-galactosidase, indicating early senescence in cholinergic neurons.
- Phosphorylation and cytoplasmic retention of FOXO1 were confirmed in Ts65Dn mice, suggesting a mechanism for senescence induction.
- Increased m1 muscarinic receptor expression in the hippocampus appeared to counteract neuronal loss.
Conclusions:
- Accelerated cholinergic neuron loss in the Ts65Dn mouse model is linked to early senescence.
- Increased cholinergic activity may trigger senescence, leading to neuronal loss and contributing to DS-related cognitive decline.
- The findings highlight potential therapeutic targets for mitigating neurodegeneration in Down syndrome and Alzheimer's disease.
