Research Project
Grant-in-Aid for Scientific Research on Priority Areas
Synapse formation depends critically on the competition among inputs of multiple sources to individual neurons. Cerebellar Purkinje cells have highly organized synaptic wiring from two distinct sources of excitatory afferents. Single climbing fibers innervate proximal dendrites of Purkinje cells, whereas numerous parallel fibers converge on their distal dendrites. Here, we demonstrate that the P/Q-type Ca^<2+> channel a1A, a major Ca^<2+> channel subtype in Purkinje cells, is crucial for this organized synapse formation. In the alA knockout mouse, ectopic spine formation was frequently observed in proximal dendrites and somata of Purkinje cells. Innervation territory of parallel fibers was expanded proximally to innervate these ectopic spines, whereas that of climbing fibers was regressed to the basal portion of proximal dendrites and somata. Furthermore, multiple climbing fibers, consisting of a strong climbing fiber and one or a few weaker ones, persisted in the majority of Purkinje cells and were co-wired to the basal somatodendritic domain. The lack of alA, therefore, results in the survival of parallel fibers and surplus climbing fibers, which should normally be expelled from the compartment innervated by the main climbing fiber. We conclude that a P/Q-type Ca^<2+> channel alA fuels both heterosynaptic competition between climbing fibers and parallel fibers and homosynaptic competition among multiple climbing fibers. This molecular function facilitates the distal extension of climbing fiber innervation along Purkinje cell's dendritic tree and also establishes mono climbing fiber innervation of individual Purkinje cells.
All 2005 2004 2003
All Journal Article (78 results)
EMBO report 6
Pages: 90-95
J.Comp.Neurol. 484
Pages: 249-259
Glia 52
Pages: 47-52
Eur.J.Neurosci. 21
Pages: 1432-1436
J. Neurosci. 484
Genes to Cells. 10
Pages: 785-792
Neuron 47
Pages: 201-213
EMBO report. 6
Glia. 52
J.Neurosci. 484
J. Neurosci. 24
Pages: 1734-1743
Genes Cells 9
Pages: 1-14
J. Biol. Chem. 279
Pages: 3573-3577
Eur. J. Neurosci. 19
Pages: 552-569
Pages: 2682-2692
J. Neurochem. 89
Pages: 1454-1461
Eur. J. Neurosci. 20
Pages: 144-160
Hippocampus 14
Pages: 193-215
Pages: 5766-5777
Pages: 9292-9304
Pages: 17634-17639
Neurosci. Lett. 365
Pages: 97-101
Mol Brain Res. 125
Pages: 60-75
J. Neurochem. 90
Pages: 526-536
Neurosci. Lett. 369
Pages: 173-178
J. Cell Biol. 167
Pages: 293-302
Neurosci. Lett. 364
Pages: 101-105
Eur. J. Neurosci 20
Pages: 2929-2944
Neurosci. Res. 50
Pages: 369-374
Pages: 3301-3312
J.Neurosci. 24
Genes Cells. 9
J.Biol.Chem. 279
Eur.J.Neurosci. 19
J.Neurochem. 89
Eur.J.Neurosci. 20
Hippocampus. 14
Neurosci.Lett. 97
J.Neurochem. 90
Neurosci.Lett. 369
J.Cell Biol. 167
Neurosci.Lett. 364
Neurosci.Res. 50
Eur.J.Neurosci 20
Pages: 33013312
J. Neurosci. 17
Pages: 550-560
Eur. J. Neurosci. 17
Pages: 545-554
Proc. Natl. Acad. Sci. USA 100
Pages: 4855-4860
Dev. Brain Res. 140
Pages: 263-268
Pages: 2503-2520
Eur. J. Neurosci 17
Pages: 2563-2572
J. Comp. Neurol. 463
Pages: 237-248
J. Neurosci 23
Pages: 8098-8108
Dev. Biol. 263
Pages: 216-230
Arch. Histol. Cytol. 66
Pages: 429-436
Neurology 61
Pages: 891-896
Pages: 109-121
J Neurosci. 23
Eur J Neurosci. 17
Proc Natl Acad Sci USA. 100
Dev.Brain Res. 140
Eur.J.Neurosci. 17
J.Comp.Neurol. 463
J.Neurosci. 23
Dev.Biol. 263
Neurol. 61
Arch.Histol.Cytol. 66