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A comprehensive small interfering RNA screen identifies signaling pathways required for gephyrin clustering.
- Source :
-
The Journal of neuroscience : the official journal of the Society for Neuroscience [J Neurosci] 2012 Oct 17; Vol. 32 (42), pp. 14821-34. - Publication Year :
- 2012
-
Abstract
- The postsynaptic scaffold protein gephyrin is clustered at inhibitory synapses and serves for the stabilization of GABA(A) receptors. Here, a comprehensive kinome-wide siRNA screen in a human HeLa cell-based model for gephyrin clustering was used to identify candidate protein kinases implicated in the stabilization of gephyrin clusters. As a result, 12 hits were identified including FGFR1 (FGF receptor 1), TrkB, and TrkC as well as components of the MAPK and mammalian target of rapamycin (mTOR) pathways. For confirmation, the impact of these hits on gephyrin clustering was analyzed in rat primary hippocampal neurons. We found that brain-derived neurotrophic factor (BDNF) acts on gephyrin clustering through MAPK signaling, and this process may be controlled by the MAPK signaling antagonist sprouty2. BDNF signaling through phosphatidylinositol 3-kinase (PI3K)-Akt also activates mTOR and represses GSK3β, which was previously shown to reduce gephyrin clustering. Gephyrin is associated with inactive mTOR and becomes released upon BDNF-dependent mTOR activation. In primary neurons, a reduction in the number of gephyrin clusters due to manipulation of the BDNF-mTOR signaling is associated with reduced GABA(A) receptor clustering, suggesting functional impairment of GABA signaling. Accordingly, application of the mTOR antagonist rapamycin leads to disinhibition of neuronal networks as measured on microelectrode arrays. In conclusion, we provide evidence that BDNF regulates gephyrin clustering via MAPK as well as PI3K-Akt-mTOR signaling.
- Subjects :
- Animals
Carrier Proteins biosynthesis
Carrier Proteins genetics
Gene Knockdown Techniques methods
HeLa Cells
Humans
Membrane Proteins biosynthesis
Membrane Proteins genetics
Mice
Primary Cell Culture
RNA, Small Interfering genetics
Rats
gamma-Aminobutyric Acid physiology
Carrier Proteins metabolism
Genetic Testing methods
Membrane Proteins metabolism
Multigene Family physiology
RNA, Small Interfering biosynthesis
Signal Transduction genetics
Subjects
Details
- Language :
- English
- ISSN :
- 1529-2401
- Volume :
- 32
- Issue :
- 42
- Database :
- MEDLINE
- Journal :
- The Journal of neuroscience : the official journal of the Society for Neuroscience
- Publication Type :
- Academic Journal
- Accession number :
- 23077067
- Full Text :
- https://doi.org/10.1523/JNEUROSCI.1261-12.2012