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

@article{Cho2007ActivationO5,
  title={Activation of 5-HT4 receptors inhibits secretion of $\beta$-amyloid peptides and increases neuronal survival},
  author={Seongeun Cho and Yun Hu},
  journal={Experimental Neurology},
  year={2007},
  volume={203},
  pages={274-278}
}
Chronic 5-HT4 receptor activation decreases Aβ production and deposition in hAPP/PS1 mice
Distinct Functional Effects of Human 5-HT4 Receptor Isoforms on β-Amyloid Secretion
TLDR
It is shown that activation of h5-HT4(d) strongly stimulates the release of sAPPα and concomitantly decreases extracellular Aβ peptides, and that the pathways regulating either β- or γ-secretase may be differentially controlled by 5- HT4 receptor isoforms.
Design, synthesis, and biological evaluation of new 5-HT4 receptor agonists: application as amyloid cascade modulators and potential therapeutic utility in Alzheimer's disease.
TLDR
Two best candidates exhibited neuroprotective activity by increasing the level of the soluble form of the amyloid precursor protein (sAPPalpha) in the cortex and hippocampus of mice and one of these compounds could also inhibit Abeta fibril formation in vitro.
Early administration of RS 67333, a specific 5-HT4 receptor agonist, prevents amyloidogenesis and behavioral deficits in the 5XFAD mouse model of Alzheimer’s disease
TLDR
The results strongly highlight this 5-HT4 receptor agonist as a promising disease modifying-agent for Alzheimer’s disease.
5-HT4 receptors constitutively promote the non-amyloidogenic pathway of APP cleavage and interact with ADAM10.
TLDR
A new mechanism whereby a GPCR constitutively stimulates the cleavage of APP by α-secretase and promotes the nonamyloidogenic pathway of APP processing is described.
5-HT₄ receptor stimulation leads to soluble AβPPα production through MMP-9 upregulation.
TLDR
It is demonstrated that 5-HT4 receptor stimulation induces expression of MMP-9 which cleaves AβPP through α-secretase-like activity, leading to an increase of sAβPPα levels and a reduction of Aβ load.
Regulation of Amyloid Precursor Protein Processing by Serotonin Signaling
TLDR
Chemical and siRNA inhibition is used to identify the proteins which mediate 5-HT4d receptor-stimulated α-secretase activity in the SH-SY5Y human neuronal cell line and shows that G protein and Src dependent activation of phospholipase C are required for α- secretase activity, while, unexpectedly, adenylyl cyclase and cAMP are not involved.
A Novel in vivo Anti-amnesic Agent, Specially Designed to Express Both Acetylcholinesterase (AChE) Inhibitory, Serotonergic Subtype 4 Receptor (5-HT4R) Agonist and Serotonergic Subtype 6 Receptor (5-HT6R) Inverse Agonist Activities, With a Potential Interest Against Alzheimer’s Disease
TLDR
5-HT4 receptor agonists are able to promote the non-amyloidogenic cleavage of the amyloid precursor protein (APP) and to favor the production of the neurotrophic protein sAPPα, which could lead to efficiently restoring the cholinergic neurotransmission deficit observed in AD.
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5-HT enhanced the level of secreted sAPPα in a time- and dose-dependent manner in Chinese hamster ovary cells stably expressing the h5- HT4(e) receptor isoform, and inhibition of protein kinase A by H89 potentiated the 5-HT-induced increase in both secreted and cellular sAPP α.
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TLDR
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