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Altered cerebellar function in mice lacking CaV2.3 Ca2+ channel
Makoto Osanai1, Hironao Saegusa, An-a Kazuno
1Department of Pharmacology and Neurobiology, Graduate School of Medicine, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan.
Abstract:
Voltage-dependent Ca(2+) channels play important roles in cerebellar functions including motor coordination and learning. Since abundant expression of Ca(V)2.3 Ca(2+) channel gene in the cerebellum was detected, we searched for possible deficits in the cerebellar functions in the Ca(V)2.3 mutant mice. Behavioral analysis detected in delayed motor learning in rotarod tests in mice heterozygous and homozygous for the Ca(V)2.3 gene disruption (Ca(V)2.3+/- and Ca(V)2.3-/-, respectively). Electrophysiological analysis of mutant mice revealed perplexing results: deficit in long-term depression (LTD) at the parallel fiber Purkinje cell synapse in Ca(V)2.3+/- mice but apparently normal LTD in Ca(V)2.3-/- mice. On the other hand, the number of spikes evoked by current injection in Purkinje cells under the current-clamp mode decreased in Ca(V)2.3 mutant mice in a gene dosage-dependent manner, suggesting that Ca(V)2.3 channel contributed to spike generation in Purkinje cells. Thus, Ca(V)2.3 channel seems to play some roles in cerebellar functions.
Insights
Voltage-dependent Ca(V)2.3 channels are crucial for cerebellar function, impacting motor learning and Purkinje cell activity. Disrupting these channels in mice led to motor learning deficits and altered Purkinje cell responses.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Voltage-dependent calcium channels are vital for cerebellar functions, including motor coordination and learning.
- The Ca(V)2.3 calcium channel subtype is highly expressed in the cerebellum.
Purpose of the Study:
- To investigate the role of the Ca(V)2.3 calcium channel in cerebellar function using genetically modified mice.
- To identify potential deficits in motor coordination and learning associated with Ca(V)2.3 gene disruption.
Main Methods:
- Behavioral analysis using rotarod tests to assess motor learning in Ca(V)2.3 mutant mice (heterozygous and homozygous).
- Electrophysiological recordings (current-clamp mode) of Purkinje cells to analyze neuronal excitability and synaptic function (long-term depression - LTD).
Main Results:
- Ca(V)2.3 mutant mice exhibited delayed motor learning.
- Electrophysiology revealed a deficit in parallel fiber-Purkinje cell long-term depression (LTD) in heterozygous mice, but not homozygous mice.
- Purkinje cell excitability, measured by evoked spike number, decreased in a gene dosage-dependent manner in Ca(V)2.3 mutant mice.
Conclusions:
- The Ca(V)2.3 channel plays a role in cerebellar functions, particularly in motor learning and Purkinje cell spike generation.
- The observed effects on LTD and Purkinje cell excitability suggest complex contributions of Ca(V)2.3 channels to cerebellar circuitry.
