Thermoregulation in the cold changes depending on the time of day and feeding condition: physiological and anatomical analyses of involved circadian mechanisms

@article{Tokizawa2009ThermoregulationIT,
  title={Thermoregulation in the cold changes depending on the time of day and feeding condition: physiological and anatomical analyses of involved circadian mechanisms},
  author={Ken Tokizawa and Yuki Uchida and Kei Nagashima},
  journal={Neuroscience},
  year={2009},
  volume={164},
  pages={1377-1386}
}
Circadian Body Temperature Rhythm and the Interaction with Energy State
TLDR
It is revealed that circadian body temperature (T b ) rhythm is significantly influenced by fasting/fasting-related hormones, and the circadian system modulates thermoregulatory response to hypothermia and/or cold depending on time and feeding condition.
Time-of-Day Effects on Metabolic and Clock-Related Adjustments to Cold
TLDR
Interestingly, after cold exposure, time-of-day mostly affected circadian clock gene expression in the soleus muscle, despite comparable changes in LA over the light–dark-cycle, adding further evidence for tissue-specific actions of the internal clock in different peripheral organs such as skeletal muscle and BAT.
Role of the Suprachiasmatic and Arcuate Nuclei in Diurnal Temperature Regulation in the Rat
TLDR
It is demonstrated that the balance between the releases of neuropeptides derived from the biological clock and from a metabolic sensory organ as the arcuate nucleus, are essential for an adequate temperature control.
Ghrelin Induces Time-Dependent Modulation of Thermoregulation in the Cold
TLDR
Results indicate that ghrelin plays an important role in inducing time-dependent changes in thermoregulation in the cold via hypothalamic pathways.
Circadian lipid synthesis in brown fat maintains murine body temperature during chronic cold
TLDR
It is demonstrated that chronic cold temperature causes new circadian rhythms of de novo lipogenesis in brown adipose tissue (BAT) caused by a cold-induced rhythm of transcription factor SREBP1c, which drives fuel synthesis in BAT and is necessary to maintain circadian body temperature during chronic cold exposure.
Functional organization of the circadian timing system
TLDR
This chapter reports several novel SPZ targets which may be important for the regulation of wakefulness, and examines the role of an excitatory subpopulation of DMH neurons by deleting a critical exon in the gene for a vesicular glutamate transporter, rendering these neurons unable to synaptically release glutamate.
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The effects of 4-day food deprivation on circadian changes in T(b) and on cold-escape and heat-escape behaviors in rats are examined and it is indicated that the peak T( b) amplitude was not different from baseline values, but the trough amplitude continuously decreased after the onset of food deprivation.
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TLDR
The results suggest that, in the fasting condition, T(core) in the dark phase was maintained by suppression of the heat loss mechanism, despite the reduction of metabolic heat production, in contrast to the response was weakened in the light phase, decreasing T( core) greatly.
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The results suggest that, in rats, hypothermia caused by starvation was not due to a decrement in thermogenic capability, but wasDue to a decrease in the threshold for the activation of thermogenesis.
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