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Global Scaling Down of Excitatory Postsynaptic Responses in Cerebellar Purkinje Cells Impairs Developmental Synapse Elimination.
- Source :
- Cell Reports; Aug2014, Vol. 8 Issue 4, p1119-1129, 11p
- Publication Year :
- 2014
-
Abstract
- Summary Synapse elimination is crucial for precise neural circuit formation during postnatal development. We examined how relative differences in synaptic strengths among competing inputs and/or absolute synaptic strengths contribute to climbing fiber (CF) to Purkinje cell (PC) synapse elimination in the cerebellum. We generated mice with PC-selective deletion of stargazin (TARP γ-2), the major AMPA receptor auxiliary subunit in PCs (γ-2 PC-KO mice). Whereas relative differences between “strong” and “weak” CF-mediated postsynaptic response are preserved, absolute strengths of CF inputs are scaled down globally in PCs of γ-2 PC-KO mice. Although the early phase of CF elimination is normal, dendritic translocation of the strongest CF and the late phase of CF elimination that requires Ca 2+ -dependent activation of Arc/Arg3.1 in PCs are both impaired in γ-2 PC-KO mice. We conclude that, although relative differences in CF synaptic inputs are initially essential, proper synaptic scaling is crucial for accomplishing CF synapse elimination. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 26391856
- Volume :
- 8
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Cell Reports
- Publication Type :
- Academic Journal
- Accession number :
- 97617365
- Full Text :
- https://doi.org/10.1016/j.celrep.2014.07.014