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A PrP(C)-caveolin-Lyn complex negatively controls neuronal GSK3β and serotonin 1B receptor
Julia Hernandez-Rapp1, Séverine Martin-Lannerée2, Théo Z Hirsch2
11] INSERM UMR-S1124, 75006 Paris France [2] Université Paris Descartes, Sorbonne Paris Cité, UMR-S1124, 75006 Paris France [3] Université Paris Sud 11, ED419 Biosigne, 91400 Orsay, France [4].
The cellular prion protein (PrP(C)) regulates GSK3β kinase activity in brain cells, influencing serotonin signaling and neurotransmission. This discovery sheds light on PrP(C)
Area of Science:
- Neuroscience
- Cellular Biology
- Biochemistry
Background:
- The cellular prion protein (PrP(C)) is abundant in the brain, but its physiological functions are not well understood.
- PrP(C) is known for its role in Transmissible Spongiform Encephalopathies via its abnormal PrP(Sc) isoform.
- GSK3β kinase is a key regulator of cellular processes, and its inhibition is neuroprotective.
Purpose of the Study:
- To investigate the physiological role of PrP(C) in serotonergic neuronal cells.
- To identify downstream targets of PrP(C) signaling.
- To elucidate the impact of PrP(C) on serotonergic neurotransmission.
Main Methods:
- Studied PrP(C) signaling pathways in serotonergic neuronal cells.
- Investigated the interaction between PrP(C) and GSK3β kinase.
- Utilized in vivo studies in PrP-deficient mice.
- Examined the distribution and activity of the serotonin 1B receptor (5-HT1BR).
Main Results:
- GSK3β kinase is a downstream target of PrP(C) signaling in serotonergic neurons.
- PrP(C) inactivates GSK3β via a caveolin-Lyn platform.
- PrP(C) potentiates serotonergic signaling by modulating 5-HT1BR activity and distribution.
- PrP-deficient mice exhibit increased GSK3β activity and altered 5-HT1BR function, leading to anxiogenic behavior.
Conclusions:
- PrP(C) plays a crucial role in regulating GSK3β activity and serotonergic neurotransmission.
- PrP(C) signaling strengthens neurotransmission by modulating the serotonin 1B receptor.
- This study reveals a novel physiological function of PrP(C) in the brain.
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