Activation of 5-HT4 receptors inhibits secretion of beta-amyloid peptides and increases neuronal survival.

Cho, S., Hu, Y.
Journal   Exp Neurol.
Species  
Analytes Measured   Abeta 40 , Abeta 42
Matrix Tested   Cell culture medium
Year   2007
Volume   203
Page Numbers   274-8
Application   Alzheimers
Abstract
Activation of 5-HT4 receptors has been shown to improve memory processes in preclinical cognition models, suggesting potential utility of 5-HT4 agonists for the symptomatic treatment of Alzheimer's disease (AD). Recent studies have shown that 5-HT4 agonists also increase the secretion of the non-amyloidogenic soluble amyloid precursor protein-alpha (sAPPalpha). In the present study, we demonstrated that a selective 5-HT4 partial agonist, RS67333, inhibited the generation of beta-amyloid peptide (Abeta) in primary cortical cultures of Tg2576 transgenic mice expressing human APP(K670N/M671L). Furthermore, treatments with RS67333 selectively increased the survival of transgenic neurons in a dose-dependent manner, which was inhibited by 5-HT4 antagonists. These and previous data collectively suggest that the 5-HT4 receptor may be an effective therapeutic target for AD, providing both symptomatic improvements and neuroprotection.

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