Catalpol regulates cholinergic nerve system function through effect on choline acetyl-transferase not M receptor
Jin-Hong Wang1, Hai Xie2, Ting-Kun Zhao1
1Key Laboratory of Applied Pharmacology of Shandong Province, Weifang Medical University, Weifang, Shandong 261053, China.
Catalpol treatment increased choline acetyl-transferase (ChAT) levels in Alzheimer's disease (AD) models, suggesting a potential therapeutic benefit for AD by regulating the cholinergic system. However, it did not affect muscarinic receptor affinity.
Area of Science:
- Neuroscience
- Pharmacology
- Biochemistry
Background:
- Alzheimer's disease (AD) is characterized by cholinergic deficits.
- Beta-amyloid (Aβ25-35) peptide is used to induce AD models in vitro and in vivo.
- Choline acetyl-transferase (ChAT) is a key enzyme in acetylcholine synthesis.
Purpose of the Study:
- To investigate the effects of catalpol on ChAT and muscarinic receptor affinity in Aβ25-35 induced PC12 cell and rat models.
- To evaluate catalpol's potential as a therapeutic agent for AD.
Main Methods:
- PC12 cells and Wistar rats were treated with Aβ25-35 to establish AD models.
- Catalpol was administered at varying doses (10μmol/l, 100μmol/l for cells; 5mg/kg, 10mg/kg for rats).
- ChAT expression, activity, and muscarinic receptor affinity were assessed using immunocytochemistry, radioenzymatic assay, and (3)H-QNB binding tests.
Main Results:
- Aβ25-35 induced a significant decrease in ChAT expression and activity in both PC12 cells and rats (p<0.01).
- Catalpol treatment dose-dependently increased ChAT expression and activity in the AD models (p<0.05 or p<0.01).
- No significant changes in muscarinic receptor affinity were observed in any group, even with increasing catalpol concentrations.
Conclusions:
- Catalpol positively regulates the cholinergic system by enhancing ChAT levels.
- Catalpol shows potential therapeutic benefits for Alzheimer's disease.
- Catalpol does not appear to influence muscarinic receptor affinity.
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