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2014 ; 29
(4
): 288-98
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A specific role for the REV-ERB?-controlled L-Type Voltage-Gated Calcium Channel
CaV1 2 in resetting the circadian clock in the late night
#MMPMID25238857
Schmutz I
; Chavan R
; Ripperger JA
; Maywood ES
; Langwieser N
; Jurik A
; Stauffer A
; Delorme JE
; Moosmang S
; Hastings MH
; Hofmann F
; Albrecht U
J Biol Rhythms
2014[Aug]; 29
(4
): 288-98
PMID25238857
show ga
Within the suprachiasmatic nucleus (SCN) of the hypothalamus, circadian
timekeeping and resetting have been shown to be largely dependent on both
membrane depolarization and intracellular second-messenger signaling. In both of
these processes, voltage-gated calcium channels (VGCCs) mediate voltage-dependent
calcium influx, which propagates neural impulses by stimulating vesicle fusion
and instigates intracellular pathways resulting in clock gene expression. Through
the cumulative actions of these processes, the phase of the internal clock is
modified to match the light cycle of the external environment. To parse out the
distinct roles of the L-type VGCCs, we analyzed mice deficient in Cav1.2
(Cacna1c) in brain tissue. We found that mice deficient in the Cav1.2 channel
exhibited a significant reduction in their ability to phase-advance circadian
behavior when subjected to a light pulse in the late night. Furthermore, the
study revealed that the expression of Cav1.2 mRNA was rhythmic (peaking during
the late night) and was regulated by the circadian clock component REV-ERB?.
Finally, the induction of clock genes in both the early and late subjective night
was affected by the loss of Cav1.2, with reductions in Per2 and Per1 in the early
and late night, respectively. In sum, these results reveal a role of the L-type
VGCC Cav1.2 in mediating both clock gene expression and phase advances in
response to a light pulse in the late night.
|Animals
[MESH]
|Calcium Channels, L-Type/*genetics
[MESH]
|Calcium/metabolism
[MESH]
|Circadian Clocks/*genetics
[MESH]
|Circadian Rhythm/*genetics
[MESH]
|Gene Expression/genetics
[MESH]
|Light
[MESH]
|Mice
[MESH]
|Mice, Inbred C57BL
[MESH]
|Nuclear Proteins/genetics
[MESH]
|Nuclear Receptor Subfamily 1, Group D, Member 1/*genetics
[MESH]