BK calcium-activated potassium channels regulate circadian behavioral rhythms and pacemaker output
Copyright policy )BK calcium-activated potassium channels regulate circadian behavioral rhythms and pacemaker output
Spontaneous action potentials in the suprachiasmatic nucleus (SCN) are necessary for normal circadian timing of behavior in mammals. The SCN exhibits a daily oscillation in spontaneous firing rate (SFR), but the ionic conductances controlling SFR and the relationship of SFR to subsequent circadian behavioral rhythms are not understood. We show that daily expression of the large conductance Ca(2+)-activated K(+) channel (BK) in the SCN is controlled by the intrinsic circadian clock. BK channel-null mice (Kcnma1(-/-)) have increased SFRs in SCN neurons selectively at night and weak circadian amplitudes in multiple behaviors timed by the SCN. Kcnma1(-/-) mice show normal expression of clock genes such as Arntl (Bmal1), indicating a role for BK channels in SCN pacemaker output, rather than in intrinsic time-keeping. Our findings implicate BK channels as important regulators of the SFR and suggest that the SCN pacemaker governs the expression of circadian behavioral rhythms through SFR modulation.
- University of Maryland, Baltimore United States
- Stanford University United States
- Northwestern University United States
Electrophysiology, Mice, Knockout, Neurons, Mice, Biological Clocks, Gene Expression Profiling, Animals, Mice, Inbred Strains, Suprachiasmatic Nucleus, Motor Activity, Large-Conductance Calcium-Activated Potassium Channel alpha Subunits, Circadian Rhythm, Oligonucleotide Array Sequence Analysis
Electrophysiology, Mice, Knockout, Neurons, Mice, Biological Clocks, Gene Expression Profiling, Animals, Mice, Inbred Strains, Suprachiasmatic Nucleus, Motor Activity, Large-Conductance Calcium-Activated Potassium Channel alpha Subunits, Circadian Rhythm, Oligonucleotide Array Sequence Analysis
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