Circadian rhythm

A circadian rhythm is an approximate daily periodicity, a roughly-24-hour cycle in the biochemical, physiological or behavioural processes of living beings, including plants, animals, fungi and cyanobacteria. The term "circadian", coined by Franz Halberg,[1] comes from the Latin circa, "around", and diem or dies, "day", meaning literally "approximately one day." The formal study of biological temporal rhythms such as daily, tidal, weekly, seasonal, and annual rhythms, is called chronobiology.

Circadian rhythms are endogenously generated, and can be entrained by external cues, called Zeitgebers. The primary one is daylight. These rhythms allow organisms to anticipate and prepare for precise and regular environmental changes.

Contents

History

The earliest known account of a circadian rhythm dates from the 4th century BC, when Androsthenes, in descriptions of the marches of Alexander the Great, described diurnal leaf movements of the tamarind tree. The first modern observation of endogenous circadian oscillation was by the French scientist Jean-Jacques d'Ortous de Mairan in the 1700s; he noted that 24-hour patterns in the movement of the leaves of the plant Mimosa pudica continued even when the plants were isolated from external stimuli.

In 1918 J. S. Szymanski showed that animals are capable of maintaining 24-hour activity patterns in the absence of external cues such as light and changes in temperature.[2]

Criteria

Three general criteria of circadian rhythms are necessary to differentiate genuinely endogenous rhythms from coincidental or apparent ones: the rhythms persist in the absence of cues, they can be brought to match the local time, and will do so in a precise manner over a range of temperatures.

Origin

Photosensitive proteins and circadian rhythms are believed to have originated in the earliest cells, with the purpose of protecting the replicating of DNA from high ultraviolet radiation during the daytime. As a result, replication was relegated to the dark. The fungus Neurospora, which exists today, retains this clock-regulated mechanism. Rhythmicity appears to be as important in regulating cyclic biochemical processes within an individual, as in coordinating with the environment. This is suggested by the maintenance (heritability) of circadian rhythms in fruit flies after several hundred generations in constant laboratory conditions (Sheeba et al. 1999), as well as the experimental elimination of behavioral but not physiological circadian rhythms in quail (Guyomarc'h et al. 1998, Zivkovic et al. 1999).

The simplest known circadian clock is that of the prokaryotic cyanobacteria. Recent research has demonstrated that the circadian clock of Synechococcus elongatus can be reconstituted in vitro with just the three proteins of their central oscillator. This clock has been shown to sustain a 22-hour rhythm over several days upon the addition of ATP. Previous explanations of the prokaryotic circadian timekeeper were dependent upon a DNA transcription / translation feedback mechanism. It is an outstanding question whether circadian clocks in eukaryotic organisms require translation/transcription-derived oscillations. For although the circadian systems of eukaryotes and prokaryotes have the same basic architecture: input - central oscillator - output, they do not share any homology. This implies probable independent origins.

In 1971, Ronald J. Konopka and Seymour Benzer first identified a genetic component of the biological clock using the fruit fly as a model system. Three mutant lines of flies displayed aberrant behaviour - one had a shorter period, another had a longer one and the third had none. All three mutations mapped to the same gene, which was named period.[3] The same gene was identified to be defective in the sleep disorder FASPS (Familial Advanced Sleep Phase Syndrome) in human beings thirty years later - underscoring the conserved nature of the molecular circadian clock through evolution. We now know many more genetic components of the biological clock. Their interactions result in an interlocked feedback loop of gene products resulting in periodic fluctuations that the cells of the body interpret as a specific time of the day.

A great deal of research on biological clocks was done in the latter half of the 20th century. It is now known that the molecular circadian clock can function within a single cell; i.e., it is cell-autonomous.[4] At the same time, different cells may communicate with each other resulting in a synchronised output of electrical signaling. These may interface with endocrine glands of the brain to result in periodic release of hormones. The receptors for these hormones may be located far across the body and synchronise the peripheral clocks of various organs. Thus, the information of the time of the day as relayed by the eyes travels to the clock in the brain, and, through that, clocks in the rest of the body may be synchronised. This is how the timing of, for example, sleep/wake, body temperature, thirst, and appetite are coordinately controlled by the biological clock.

Importance in animals

Circadian rhythms are important in determining the sleeping and feeding patterns of all animals, including human beings. There are clear patterns of core body temperature, brain wave activity, hormone production, cell regeneration and other biological activities linked to this daily cycle. In addition, photoperiodism, the physiological reaction of organisms to the length of day or night, is vital to both plants and animals, and the circadian system plays a role in the measurement and interpretation of daylength.

«Timely prediction of seasonal periods of weather conditions, food availability or predator activity is crucial for survival of many species. Although not the only parameter, the changing length of the photoperiod ('daylength') is the most predictive environmental cue for the seasonal timing of physiology and behavior, most notably for timing of migration, hibernation and reproduction.»[5]

Impact of light-dark cycle

The rhythm is linked to the light-dark cycle. Animals, including humans, kept in total darkness for extended periods eventually function with a freerunning rhythm. Each "day," their sleep cycle is pushed back or forward, depending on whether their endogenous period is shorter or longer than 24 hours. The environmental cues that each day reset the rhythms are called Zeitgebers (from the German, Time Givers).[6] It is interesting to note that totally-blind subterranean mammals (e.g., blind mole rat Spalax sp.) are able to maintain their endogenous clocks in the apparent absence of external stimuli.

Freerunning organisms that normally have one consolidated sleep episode will still have it when in an environment shielded from external cues, but the rhythm is, of course, not entrained to the 24-hour light/dark cycle in nature. The sleep/wake rhythm may, in these circumstances, become out of phase with other circadian or ultradian rhythms such as temperature and digestion.

Recent research has influenced the design of spacecraft environments, as systems that mimic the light/dark cycle have been found to be highly beneficial to astronauts.

Arctic animals

Norwegian researchers at the University of Tromsø have shown that some Arctic animals (ptarmigan, reindeer) show circadian rhythms only in the parts of the year that have daily sunrises and sunsets. In one study of reindeer, animals at 70 degrees North showed circadian rhythms in the autumn, winter, and spring, but not in the summer. Reindeer at 78 degrees North showed such rhythms only autumn and spring. The researchers suspect that other Arctic animals as well may not show circadian rhythms in the constant light of summer and the constant dark of winter.[7][8]

However, another study in northern Alaska found that ground squirrels and porcupines strictly maintained their circadian rhythms through 82 days and nights of sunshine. The researchers speculate that these two small mammals see that the apparent distance between the sun and the horizon is shortest once a day, and, thus, a sufficient signal to adjust by.[9]

The biological clock in mammals

The primary circadian "clock" in mammals is located in the suprachiasmatic nucleus (or nuclei) (SCN), a pair of distinct groups of cells located in the hypothalamus. Destruction of the SCN results in the complete absence of a regular sleep/wake rhythm. The SCN receives information about illumination through the eyes. The retina of the eyes contains not only "classical" photoreceptors but also photoresponsive retinal ganglion cells. These cells, which contain a photo pigment called melanopsin, follow a pathway called the retinohypothalamic tract, leading to the SCN. If cells from the SCN are removed and cultured, they maintain their own rhythm in the absence of external cues.

It appears that the SCN takes the information on day length from the retina, interprets it, and passes it on to the pineal gland, a tiny structure shaped like a pine cone and located on the epithalamus. In response the pineal secretes the hormone melatonin. Secretion of melatonin peaks at night and ebbs during the day.

The circadian rhythms of humans can be entrained to slightly shorter and longer periods than the earth's 24 hours. Researchers at Harvard have recently shown that human subjects can at least be entrained to a 23.5-hour cycle and a 24.65-hour cycle (the latter being the natural solar day-night cycle on the planet Mars).[10]

Determining the human circadian rhythm

Overview of human circadian biological clock with some physiological parameters.

The classic phase markers for measuring the timing of a mammal's circadian rhythm are melatonin secretion by the pineal gland and core body temperature.

For temperature studies, people must remain awake but calm and semi-reclined in near darkness while their rectal temperatures are taken continuously. The average human adult's temperature reaches its minimum at about 05:00 (5 a.m.), about two hours before habitual wake time, though variation is great among normal chronotypes.

Melatonin is absent from the system or undetectably low during daytime. Its onset in dim light, dim-light melatonin onset (DLMO), at about 21:00 (9 p.m.) can be measured in the blood or the saliva. Both DLMO and the midpoint (in time) of the presence of the hormone in the blood or saliva have been used as circadian markers.

However, newer research indicates that the melatonin offset may be the most reliable marker. Benloucif et al in Chicago in 2005 found that melatonin phase markers were more stable and more highly correlated with the timing of sleep than the core temperature minimum. They found that both sleep offset and melatonin offset were more strongly correlated with the various phase markers than sleep onset. In addition, the declining phase of the melatonin levels was more reliable and stable than the termination of melatonin synthesis.[11]

One method used for measuring melatonin offset is to analyze a sequence of urine samples throughout the morning for the presence of the melatonin metabolite 6-sulphatoxymelatonin (aMT6s). Laberge et al in Quebec in 1997 used this method in a study which confirmed the frequently found delayed circadian phase in healthy adolescents.[12]

Outside the "master clock"

More-or-less independent circadian rhythms are found in many organs and cells in the body outside the suprachiasmatic nuclei (SCN), the "master clock." These clocks, called peripheral oscillators, are found in the esophagus, lung, liver, pancreas, spleen, thymus and the skin.[13] Though oscillators in the skin respond to light, a systemic influence has not been proven so far.[14][15] There is some evidence that also the olfactory bulb and prostate may experience oscillations when cultured, suggesting that also these structures may be weak oscillators.

Furthermore, liver cells, for example, appear to respond to feeding rather than to light. Cells from many parts of the body appear to have freerunning rhythms.

Light and the biological clock

Light resets the biological clock in accordance with the phase response curve (PRC). Depending on the timing, light can advance or delay the circadian rhythm. Both the PRC and the required illuminance vary from species to species; much lower light levels are required to reset the clocks in nocturnal rodents than in humans.

In addition to light intensity, wavelength (or color) of light is an important factor in the degree to which the clock is reset. Melanopsin is most efficiently excited by blue light, 420-440 nm[16] according to some researchers while others have reported 470-485nm.

The myth of the 25-hour day

Early investigators determined the human circadian period to be 25 hours or more. They went to great lengths to shield subjects from time cues and daylight, but they were not aware of the effects of indoor electric lights. The subjects were allowed to turn on light when they were awake and to turn it off when they wanted to sleep. Electric light in the evening delayed their circadian phase. These results became well known.[17]

The human circadian period

Modern research under very controlled conditions has shown the human period for adults to be just slightly longer than 24 hours on average. Czeisler et al at Harvard found the range for normal, healthy adults of all ages to be quite narrow: 24 hours and 11 minutes ± 16 minutes. The "clock" resets itself daily to the 24-hour cycle of the earth's rotation.[17] The main issue which the Circadian Concept misses, which is vital when understanding time and it's involvement in the human condition, is that time is a bourgeois concept, and as such should be ignored at all times.

Human health

Timing of medical treatment in coordination with the body clock may significantly increase efficacy and reduce drug toxicity or adverse reactions. For example, appropriately timed treatment with angiotensin converting enzyme inhibitors (ACEi) may reduce nocturnal blood pressure and also benefit left ventricular (reverse) remodeling. A number of studies have also concluded that a short period of sleep during the day (commonly referred to as a power-nap) does not have any affect on normal circadian rhythm, yet a power-nap can decrease stress and improve productivity. [18][19]

There are many health problems associated with a disturbance in the human circadian rhythm, such as Seasonal Affective Disorder (SAD), delayed sleep phase syndrome (DSPS) and other circadian rhythm disorders.[20] Circadian rhythms also play a part in the reticular activating system which is crucial for maintaining a state of consciousness. In addition, a reversal in the sleep-wake cycle may be a sign or complication of uremia,[21] azotemia or acute renal failure.

Disruption

Disruption to rhythms usually has a negative effect. Many travelers have experienced the condition known as jet lag, with its associated symptoms of fatigue, disorientation and insomnia.

A number of other disorders, for example bipolar disorder and some sleep disorders, are associated with irregular or pathological functioning of circadian rhythms. Recent research suggests that circadian rhythm disturbances found in bipolar disorder are positively influenced by lithium's effect on clock genes.[22]

Disruption to rhythms in the longer term is believed to have significant adverse health consequences on peripheral organs outside the brain, particularly in the development or exacerbation of cardiovascular disease. The suppression of melatonin production associated with the disruption of the circadian rhythm may increase the risk of developing cancer.[23][24]

Effects on cocaine sensitization in mice

Circadian rhythms and clock genes expressed in brain regions outside the SCN may significantly influence the effects produced by drugs such as cocaine.[25][26] Moreover, genetic manipulations of clock genes profoundly affect cocaine's actions.[27]

See also

Notes

  1. ↑ http://www.msi.umn.edu/~halberg Halberg Chronobiology Centre
  2. ↑ Danchin, Antoine. "Important dates 1900-1919". HKU-Pasteur Research Centre (Paris). http://www.pasteur.fr/recherche/unites/REG/causeries/dates_1900.html. Retrieved on 2008-01-12. 
  3. ↑ Purves, Dale et al. "Molecular Mechanisms of Biological Clocks" (e-book). NEUROSCIENCE (second edition ed.). Sunderland, MA, U.S.A.: Sinauer Associates. ISBN 0-87893-742-0. http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=neurosci.box.1963. Retrieved on 2008-05-30. 
  4. ↑ Circadian gene expression in individual fibroblast...[Cell. 2004] - PubMed Result
  5. ↑ Zivkovic, Bora "Coturnix" (2005-08-13 / July 25, 2007). "Clock Tutorial #16: Photoperiodism - Models and Experimental Approaches". A Blog Around the Clock. ScienceBlogs. Retrieved on 2007-12-09.
  6. ↑ "Circadian rhythms". Rapid eye movement (REM) sleep. Armenian Medical Network (2007). Retrieved on 2007-09-19.
  7. ↑ Spilde, Ingrid (December 2005). "Reinsdyr uten døgnrytme" (in Language: Norwegian, Bokmål), forskning.no. Retrieved on 2007-11-24. 
  8. ↑ Zivkovic, Bora, aka Coturnix, chronobiologist. "Circadian Rhythms, or Not, in Arctic Reindeer". A Blog around the Clock. ScienceBlogs.com. Retrieved on 2007-11-24.
  9. ↑ Zivkovic, Bora, aka Coturnix, chronobiologist (2007-02-11). "Small Arctic Mammals Entrain to Something during the Long Summer Day". A Blog Around the Clock. ScienceBlogs.com. Retrieved on 2007-11-26.
  10. ↑ Scheer, Frank A. J. L.; Kenneth P. Wright, Jr., Richard E. Kronauer, Charles A. Czeisler (2007-08-08). "Plasticity of the Intrinsic Period of the Human Circadian Timing System". PLoS ONE 2: e721. doi:10.1371/journal.pone.0000721. http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0000721. Retrieved on 2007-12-31. 
  11. ↑ Benloucif, S.; Guico, M.J.; Reid, K.J.; Wolfe, L.F.; L'Hermite-Baleriaux, M.; Zee, P.C. (2005). "Stability of melatonin and temperature as circadian phase markers and their relation to sleep times in humans". J Biol Rhythms (Chicago, Illinois, USA: Center for Sleep and Circadian Biology, Departments of Neurology, Northwestern University Feinberg School of Medicine) 20 (2): pages 178–88. doi:10.1177/0748730404273983. PMID 15834114. http://www.websciences.org/cftemplate/NAPS/archives/indiv.cfm?ID=20045590. Retrieved on 2007-12-18. 
  12. ↑ Laberge, L.; Lesperance, P.; Tremblay, R.; Lambert, C.; Montplaisir, J. (1997). "Phase delay of 6-sulphatoxymelatonin in normal adolescents" (in English). Sleep Research (Québec, Canada: Centre d'etude du Sommeil, Hopital du Sacre-Coeur, Département de Psychologie, Département de Pharmacologie, Departement de Psychiatrie, Université de Montréal) 26: p. 727. http://www.websciences.org/cftemplate/NAPS/archives/indiv.cfm?ID=19979287. Retrieved on 2007-12-18. 
  13. ↑ Zanello, S. et al., J. Inv. Dermatol. 2000, Vol. 115, 4 Oct.: Expression of the Circadian Clock Genes clock and period1 in Human Skin
  14. ↑ Kawara, S. et al. J. Inv. Derm. 2002, Vol 119, 6 Dec.: Low-dose UVB Rays Alter the mRNA Expression of the Circadian Clock Genes in cultured Human Keratinocytes
  15. ↑ Campbell, S. and Murphy, P, Science 1998, Vol 279, 16 Jan.: Extraocular Circadian Phototransduction in Humans
  16. ↑ Newman LA, Walker MT, Brown RL, Cronin TW, Robinson PR: "Melanopsin forms a functional short-wavelength photopigment", Biochemistry. 2003 Nov 11;42(44):12734-8.
  17. ↑ 17.0 17.1 "Human Biological Clock Set Back an Hour" (1999). Retrieved on 2007-09-23. "The variation between our subjects, with a 95 percent level of confidence, was no more than plus or minus 16 minutes, a remarkably small range."
  18. ↑ "The prevalence of daytime napping and its relationship to nighttime sleep". The prevalence of daytime napping and its relationship to nighttime sleep. Behavioral medicine (2001). Retrieved on 2008-11-11.
  19. ↑ "Power Napping: Effects on Cognitive Ability and Stress Levels Among College Students". Power Napping: Effects on Cognitive Ability and Stress Levels Among College Students. Liberty University (2007). Retrieved on 2008-11-11.
  20. ↑ "Circadian Rhythms and Sleep". Circadian Rhythms and Sleep. Serendip (2007). Retrieved on 2007-09-19.
  21. ↑ Sinert, Richard; Peter R Peacock, Jr (May 10, 2006). "Renal Failure, Acute". eMedicine from WebMD. Retrieved on 2008-08-03.
  22. ↑ NIMH · Science News from 2006 · Lithium Blocks Enzyme To Help Cells’ Clocks Keep On Tickin’
  23. ↑ Straif K, Baan R, Grosse Y, Secretan B, El Ghissassi F, Bouvard V, Altieri A, Benbrahim-Tallaa L, Cogliano V, WHO International Agency for Research on Cancer Monograph Working Group. Carcinogenicity of shift-work, painting, and fire-fighting. [1] Lancet Oncol. 2007; 12(8):1065-1066.
  24. ↑ WebMD: Night Shift Work May Cause Cancer
  25. ↑ Uz T, Akhisaroglu M, Ahmed R, Manev H (2003). "The pineal gland is critical for circadian Period1 expression in the striatum and for circadian cocaine sensitization in mice". Neuropsychopharmacology 28 (12): 2117–23. doi:10.1038/sj.npp.1300254. PMID 12865893. 
  26. ↑ Kurtuncu M, Arslan A, Akhisaroglu M, Manev H, Uz T (2004). "Involvement of the pineal gland in diurnal cocaine reward in mice". Eur J Pharmacol 489 (3): 203–5. doi:10.1016/j.ejphar.2004.03.010. PMID 15087244. 
  27. ↑ McClung C, Sidiropoulou K, Vitaterna M, Takahashi J, White F, Cooper D, Nestler E (2005). "Regulation of dopaminergic transmission and cocaine reward by the Clock gene". Proc Natl Acad Sci USA 102 (26): 9377–81. PMID 15967985. 

Further reading

Moore-Ede, Martin C., Sulszman, Frank M., and Fuller, Charles A. (1982) "The Clocks that Time Us: Physiology of the Circadian Timing System." Harvard University Press, Cambridge, MA. ISBN 0-674-13581-4.

External links