Christopher T. Steele

Works (6)

Updated: July 5th, 2023 16:02

2005 journal article

Time keeping by the quail's eye: Cireadian regulation of melatonin production

GENERAL AND COMPARATIVE ENDOCRINOLOGY, 145(3), 232–236.

By: C. Steele n, G. Tosini *, T. Siopes n & H. Underwood n

author keywords: circadian pacemaker; retina; Coturnix; serotonin
MeSH headings : 5-Hydroxytryptophan / pharmacology; Animals; Biological Clocks / physiology; Circadian Rhythm / physiology; Coturnix / physiology; Darkness; Eye / drug effects; Eye / metabolism; Eye / radiation effects; Light; Male; Melatonin / metabolism; Retina / drug effects; Retina / metabolism; Retina / radiation effects; Serotonin / pharmacology; Time Factors; Tissue Culture Techniques
TL;DR: The results show definitively that the eyes are the loci of a biological clock and strengthen the hypothesis that the ocular clock is a circadian pacemaker that can affect the rest of the circadian system via the cyclic synthesis and release of melatonin. (via Semantic Scholar)
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Added: August 6, 2018

2003 journal article

Ocular clocks are tightly coupled and act as pacemakers in the circadian system of Japanese quail

AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY, 284(1), R208–R218.

By: C. Steele n, B. Zivkovic n, T. Siopes* & H. Underwood*

author keywords: melatonin; body temperature; eye; circadian; Coturnix
MeSH headings : Animals; Biological Clocks / physiology; Body Temperature; Circadian Rhythm / physiology; Coturnix / physiology; Eye / chemistry; Female; Male; Melatonin / analysis; Melatonin / blood; Ocular Physiological Phenomena; Photoperiod
TL;DR: The ability to maintain phase in DD and rapidly recouple after out-of-phase entrainment demonstrates that the eyes are strongly coupled pacemakers that work in synchrony to drive circadian rhythmicity in Japanese quail. (via Semantic Scholar)
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Added: August 6, 2018

2002 journal article

Pineal melatonin secretion, but not ocular melatonin secretion, is sufficient to maintain normal immune responses in Japanese quail (Coturnix coturnix japonica)

GENERAL AND COMPARATIVE ENDOCRINOLOGY, 126(3), 352–358.

By: C. Moore n, T. Siopes n, C. Steele n & H. Underwood n

author keywords: melatonin; immune response; Japanese quail; pineal; eye
MeSH headings : Animals; Antibody Formation; CD4 Lymphocyte Count; CD8-Positive T-Lymphocytes; Coturnix / immunology; Coturnix / physiology; Eye / metabolism; Female; Flow Cytometry; Immunity; Immunity, Cellular; Lymphocyte Count; Melatonin / administration & dosage; Melatonin / metabolism; Pineal Gland / metabolism; Pineal Gland / surgery
TL;DR: The data suggest that immunodepression is only observed in birds with two thirds of the plasma melatonin removed by pinealectomy, and removal of one third of the Plasma melatonin is not sufficient to reduce cellular and humoral responses in the Japanese quail. (via Semantic Scholar)
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2001 journal article

Circadian organization and the role of the pineal in birds

MICROSCOPY RESEARCH AND TECHNIQUE, 53(1), 48–62.

By: H. Underwood n, C. Steele n & B. Zivkovic n

author keywords: avian; melatonin; suprachiasmatic nucleus; extraretinal photoreception; ocular pacemaker
MeSH headings : Animals; Biological Clocks / physiology; Birds / anatomy & histology; Birds / physiology; Circadian Rhythm / physiology; Female; Gonadal Steroid Hormones / physiology; Hypothalamus / physiology; Male; Ocular Physiological Phenomena; Photoreceptor Cells, Vertebrate / physiology; Pineal Gland / physiology; Reproduction; Suprachiasmatic Nucleus / physiology
TL;DR: All organisms exhibit significant daily rhythms in a myriad of functions from molecular levels to the level of the whole organism, showing that they are driven by an internal circadian clock. (via Semantic Scholar)
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Added: August 6, 2018

1999 journal article

Effects of fasting on the circadian body temperature rhythm of Japanese quail

PHYSIOLOGY & BEHAVIOR, 66(1), 137–143.

By: H. Underwood n, C. Steele n & B. Zivkovic n

author keywords: circadian; temperature rhythm; fasting; activity rhythm; quail
MeSH headings : Animals; Blindness / physiopathology; Body Temperature / physiology; Circadian Rhythm / physiology; Coturnix / physiology; Fasting / physiology; Female; Photoreceptor Cells / physiology
TL;DR: Measurements of activity levels before and during fasting indicate that fasting-induced hypothermia cannot be explained simply as a consequence of decreases in activity levels, and food deprivation was also observed to cause significant phase shifts in the endogenous rhythm of body temperature. (via Semantic Scholar)
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Added: August 6, 2018

1999 journal article

Formal properties of the circadian and photoperiodic systems of Japanese quail: Phase response curve and effects of T-cycles

JOURNAL OF BIOLOGICAL RHYTHMS, 14(5), 378–390.

By: B. Zivkovic n, H. Underwood*, C. Steele n & K. Edmonds n

author keywords: Japanese quail; circadian rhythms; photoperiodism; reproduction; phase response curve; T-cycles
MeSH headings : Animals; Body Temperature / physiology; Circadian Rhythm / physiology; Coturnix / physiology; Female; Motor Activity / physiology; Oviposition / physiology; Ovulation / physiology; Photoperiod; Time Factors
TL;DR: Studies of the circadian and photoperiodic system of Japanese quail showed that the circadian system acts like a low-amplitude oscillator: It is readily reset by light without significant transients, has a Type 0 phase response curve (PRC), and has a large range of entrainment. (via Semantic Scholar)
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Added: August 6, 2018

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