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![Page 1: Neurobiology of Circadian Rhythms Daniel J. Buysse, M.D. Professor of Psychiatry University of Pittsburgh School of Medicine buyssedj@upmc.edu Pittsburgh.](https://reader036.fdocuments.in/reader036/viewer/2022062321/56649dca5503460f94ac0c4a/html5/thumbnails/1.jpg)
Neurobiology of Circadian RhythmsNeurobiology of Circadian Rhythms
Daniel J. Buysse, M.D.Daniel J. Buysse, M.D.Professor of PsychiatryProfessor of PsychiatryUniversity of Pittsburgh School of MedicineUniversity of Pittsburgh School of [email protected]
Pittsburgh Mind-Body Center Short Course on SleepPittsburgh Mind-Body Center Short Course on SleepPittsburgh, PAPittsburgh, PADecember 8, 2006December 8, 2006
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Neurobiology of Circadian RhythmsNeurobiology of Circadian Rhythms
SignificanceSignificance Terms and conceptsTerms and concepts Properties and characteristics of circadian Properties and characteristics of circadian
rhythmsrhythms Neuroanatomy of the circadian systemNeuroanatomy of the circadian system Molecular biology of the circadian clockMolecular biology of the circadian clock
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Functional significance of circadian rhythmsFunctional significance of circadian rhythms
Fundamental property of living organismsFundamental property of living organisms ““Predictive homeostasis:” Matching of rest/ activity Predictive homeostasis:” Matching of rest/ activity
patterns and functioning to geophysical daypatterns and functioning to geophysical day Virtually every physiological and mental function in Virtually every physiological and mental function in
human beings varies as a function of time of dayhuman beings varies as a function of time of day
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Single-occupant motor vehicle crashesSingle-occupant motor vehicle crashesPack, Pack, Accid. Anal. and PrevAccid. Anal. and Prev., 1995., 1995
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Circadian rhythms: Key termsCircadian rhythms: Key terms
PeriodPeriod: Time to complete one cycle: Time to complete one cycle– Ultradian: Period shorter than a dayUltradian: Period shorter than a day
– Circadian: Period of about a dayCircadian: Period of about a day
– Infradian: Period longer than a dayInfradian: Period longer than a day FrequencyFrequency: Cycles / time period: Cycles / time period AmplitudeAmplitude: One-half of peak-trough difference: One-half of peak-trough difference PhasePhase: Timing of a rhythm relative to a reference: Timing of a rhythm relative to a reference AcrophaseAcrophase: Time of maximum value: Time of maximum value
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Rhythms: Terms Rhythms: Terms
Amplitude
Period
Phase Difference in phase (Phase angle)
Acrophase
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Examples of biological rhythms with Examples of biological rhythms with different periodicitiesdifferent periodicities
Ultradian
Circadian
Infradian
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Examples of humanExamples of humancircadian rhythmscircadian rhythmsCzeisler and Khalsa, 2000Czeisler and Khalsa, 2000
Core body temperature
Urine volume
Thyroid StimulatingHormone
Growth Hormone
Prolactin
Parathyroid Hormone
Motor activity
Cortisol
Time
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Circadian rhythms in performanceDijk and Edgar, 1999
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Neurobiology of Circadian RhythmsNeurobiology of Circadian Rhythms
Terms and conceptsTerms and concepts Properties and characteristics of circadian Properties and characteristics of circadian
rhythmsrhythms Neuroanatomy of the circadian systemNeuroanatomy of the circadian system Molecular biology of the circadian clockMolecular biology of the circadian clock
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Circadian rhythms: Properties and Circadian rhythms: Properties and characteristicscharacteristics
EntrainmentEntrainment: Synchronization of a rhythm to an external time : Synchronization of a rhythm to an external time cuecue
ZeitgeberZeitgeber: External (environmental) time cue: External (environmental) time cue Range of entrainmentRange of entrainment: Length of days to which an organism : Length of days to which an organism
can be entrainedcan be entrained Free-runningFree-running: Circadian rhythm that is not entrained to : Circadian rhythm that is not entrained to
zeitgebers, i.e., running at its endogenous period lengthzeitgebers, i.e., running at its endogenous period length MaskingMasking: Alteration of endogenous rhythm by environmental : Alteration of endogenous rhythm by environmental
or behavioral factorsor behavioral factors Constant routineConstant routine: Study design to examine endogenous : Study design to examine endogenous
rhythms free of masking effects of sleep, posture, activity, rhythms free of masking effects of sleep, posture, activity, mealsmeals
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Rest-activity rhythm in a human subject
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Free-running activity rhythms in different mammalian speciesMoore–Ede, 1982
Mouse:period < 24 hours
Monkey:period < 24 hours
Human:period > 24 hours
Time of Day 0 12 24 12 24
Periods of activity are “double-plotted,” i.e., each day is shown twice: Once to the right, and once below the previous day
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Entrainment by zeitgebers in a human subject Moore-Ede, 1982
Time of Day (hours)
Scheduled rest-activity
Unscheduled “free-running”
Scheduled light-dark schedule
Unscheduled “free-running”
Scheduled light-dark schedule
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Examples of humanExamples of humancircadian rhythms: circadian rhythms: Masking effects of Masking effects of sleepsleepCzeisler and Khalsa, 2000Czeisler and Khalsa, 2000
Core body temperature
Urine volume
Thyroid StimulatingHormone
Growth Hormone
Prolactin
Parathyroid Hormone
Motor activity
Cortisol
Entrained Constant Routine
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Sleep-wake cycle period of 28 hours
Core body temperaturerhythm period just over 24 hours (tau = 24.17 hours)
Forced internal desynchronyCzeisler and Khalsa, 2000
Enforced 28-hour sleep-wake cycle is beyond the range of entrainment. As a result, sleep-wake cycle and core body temperature rhythms have different period lengths, i.e., are desynchronized.
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Phase response curve of activity to light in Phase response curve of activity to light in a nocturnal animal a nocturnal animal Moore-Ede, 1982
Circadian time (hrs)
Phase advances
Phase shifts
Phasedelays
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Components of the circadian timing system Kilduff and Kushida, 1999
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Anatomy of the circadian timing system: Anatomy of the circadian timing system: AnimationAnimation
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Anatomy of the circadian timing systemAnatomy of the circadian timing systemRetinal ganglion cells
Retinohypothalamic tractSCN of thehypothalamus
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Anatomy of the circadian timing systemAnatomy of the circadian timing system
Retinal ganglion cells
Retinohypothalamic tract
Suprachiasmatic nucleus = SCN
Opticchiasm Pituitary
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Effects of lesion of the suprachiasmatic nucleus (SCN) Kilduff and Kushida, 1999
Hours
Day
s
SCN destroyed
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Efferents from the SCNEfferents from the SCN
SCN
Hypothalamus (subparaventricular,
dorsomedial, posterior nuclei)Thalamus (paraventricular
Nucleus)
Medial preopticarea
Anterior, lateralhypothalamus
Lateral geniculatenucleus
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Molecular mechanisms of the circadian Molecular mechanisms of the circadian clock: Animationclock: Animation
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Genetic and molecular mechanism of circadian rhythm control Pace-Schott and Hobson, 2002
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Genetic and molecular mechanism of circadian rhythm control Pace-Schott and Hobson, 2002
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Regions with greater relative glucose Regions with greater relative glucose metabolism in evening than morning metabolism in evening than morning Buysse, Buysse, SleepSleep, 2004; 27:1245-54, 2004; 27:1245-54
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[[1818F] deoxyglucose PET during a.m. and p.m. F] deoxyglucose PET during a.m. and p.m. wakefulness in healthy adultswakefulness in healthy adults Buysse, Buysse, SleepSleep, 2004; 27:1245-54, 2004; 27:1245-54
Midbrain reticularformation/ Raphe
Pontine reticularformation
Posterior hypothalamus
L Locuscoeruleus
R Locuscoeruleus