Journal ArticleDOI
Restricted daily feeding does not entrain circadian rhythms of the suprachiasmatic nucleus in the rat
TLDR
Neural activity of the suprachiasmatic nucleus in male albino rats was recorded under restricted daily feeding schedule, providing more support to the widespread notion that the SCN is an anatomical locus of the circadian pacemaker in rodents.About:
This article is published in Brain Research.The article was published on 1982-01-28. It has received 63 citations till now. The article focuses on the topics: Light effects on circadian rhythm & Suprachiasmatic nucleus.read more
Citations
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Journal ArticleDOI
Entrainment of the Circadian Clock in the Liver by Feeding
TL;DR: It is demonstrated that feeding cycles can entrain the liver independently of the SCN and the light cycle, and the need to reexamine the mammalian circadian hierarchy is suggested, raising the possibility that peripheral circadian oscillators like those in the liver may be coupled to theSCN primarily through rhythmic behavior, such as feeding.
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Circadian food-anticipatory activity: formal models and physiological mechanisms
TL;DR: A critical review of several explanatory models indicates that hourglass clocks and associative learning processes are inadequate to explain many properties of FAA in intact and suprachiasmatic nuclei ablated rodents, and an entrainment model, invoking separate, compound food- and light-entrainable oscillators, provides a more complete account of FAA.
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Neurobiology of the sleep-wake cycle: sleep architecture, circadian regulation, and regulatory feedback.
TL;DR: The authors describe the hypothalamic circuitry for the integration of photic and nonphotic environmental time cues and how this integration allows organisms to sculpt patterns of rest-activity and sleep-wake cycles that are optimally adaptive.
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The dorsomedial hypothalamic nucleus is critical for the expression of food-entrainable circadian rhythms.
TL;DR: It is reported that restricted feeding synchronized the daily rhythm of DMH activity in rats such that c-Fos expression in the DMH was highest at scheduled mealtime, and the degree of food entrainment correlated with the number of remaining DMH neurons.
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Circadian neural rhythms in mammals
TL;DR: There is no conclusive evidence that circadian rhythms can be generated over a prolonged period of time in the absence of the SCN in mammals maintained under constant environmental conditions, and recent studies in humans suggest that disorders within the circadian system itself may be involved in the etiology of at least some forms of mental illness.
References
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Persistence of circadian rhythmicity in a mammalian hypothalamic "island" containing the suprachiasmatic nucleus
TL;DR: Simultaneous recording from two extracellular electrodes indicated neural activity at two sites in the brain, one of which is in or near the suprachiasmatic nucleus and the other in one of many other brain locations, which indicated clear circadian rhythmicity of spontaneous neural activity.
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Food and water restriction shifts corticosterone, temperature, activity and brain amine periodicity.
TL;DR: It is demonstrated that presence of normal light-dark alteration is not sufficient for the maintenance of normal circadian periodicity of plasma corticosteroid levels, and a reversal of AM/PM ratios of hippocampal norepinephrine and of serotonin levels in these animals is demonstrated.
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Feeding schedules and the circadian organization of behavior in the rat.
TL;DR: Results provide evidence for the participation of two distinct circadian systems in the control of behavior in the rat, which appear to have different entrainment characteristics and separate physiological substrates.
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Anticipation of 24-hr feeding schedules in rats with lesions of the suprachiasmatic nucleus.
TL;DR: The results suggest that circadian oscillators outside SCN can be entrained by restricted feeding schedules or, alternatively, that anticipatory activity is based on the hourglass principle, i.e., a clock which requires daily resetting.