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Article: A single incidental dark pulse during daytime attenuated food anticipatory behavior.

Balaji, Khaviya / Taufique, S K Tahajjul / Shen, Melody / Ehichioya, David E / Farah, Sofia / Yamazaki, Shin

2024 Volume 17, Issue 1, Page(s) 2341050

Abstract: Using an open-source operant feeding device (FED3), we measured food-seeking nose poking behavior in mice. When the mice were exposed to 4 h restricted feeding at night, all mice exhibited robust food anticipatory nose poking starting ~4 h before ... ...

Abstract	Using an open-source operant feeding device (FED3), we measured food-seeking nose poking behavior in mice. When the mice were exposed to 4 h restricted feeding at night, all mice exhibited robust food anticipatory nose poking starting ~4 h before scheduled mealtime. When the light-dark cycle was advanced by 6 h, mice exhibited two distinct bouts of anticipatory poking, one corresponding to actual mealtime which continued at the same time of day, and one corresponding to predicted mealtime which shifted parallel with the light-dark cycle. Likewise, two similar bouts of food-seeking behavior appeared when the light-dark cycle was delayed for 9 h. These data suggest that food anticipatory behavior is encoded to a circadian oscillator that entrains to the light-dark cycle. Two weeks after advancing the light-dark cycle, mice incidentally received a 3.5 h dark pulse in the middle of the day. This single dark pulse had a negligible effect on running wheel behavior but caused a temporary attenuation of both food anticipatory poking and pellet intake. These results suggest that the circadian oscillator controlling food anticipatory poking is sensitive to light disruption and that proper food anticipation is critical for sufficient food intake during temporally restricted feeding.
Language	English
Publishing date	2024-04-23
Publishing country	United States
Document type	Journal Article
ZDB-ID	2451097-X
ISSN	1942-0889
ISSN	1942-0889
DOI	10.1080/19420889.2024.2341050
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Elucidation of the mechanism of melamine adsorption on Pt(111) surface

Tada, Kohei / Yamazaki, Shin-Ichi / Asahi, Masafumi / Ioroi, Tsutomu

Physical chemistry chemical physics : PCCP

2023 Volume 25, Issue 34, Page(s) 23047–23057

Abstract: The oxygen reduction reaction (ORR) activity of Pt catalysts in polymer electrolyte fuel cells (PEFCs) should be enhanced to reduce Pt usage. The adsorption of heteroaromatic ring compounds such as melamine on the Pt surface can enhance its catalytic ... ...

Abstract	The oxygen reduction reaction (ORR) activity of Pt catalysts in polymer electrolyte fuel cells (PEFCs) should be enhanced to reduce Pt usage. The adsorption of heteroaromatic ring compounds such as melamine on the Pt surface can enhance its catalytic activity. However, melamine adsorption on Pt and the consequent ORR enhancement mechanism remain unclear. In this study, we performed density functional theory calculations to determine the adsorption structures of melamine/Pt(111). Melamine was coordinated to Pt
Language	English
Publishing date	2023-08-30
Publishing country	England
Document type	Journal Article
ZDB-ID	1476244-4
ISSN	1463-9084 ; 1463-9076
ISSN (online)	1463-9084
ISSN	1463-9076
DOI	10.1039/d3cp01777j
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Article ; Online: A time memory engram embedded in a light-entrainable circadian clock.

Ehichioya, David E / Taufique, S K Tahajjul / Farah, Sofia / Yamazaki, Shin

Current biology : CB

2023 Volume 33, Issue 23, Page(s) 5233–5239.e3

Abstract: A longstanding mystery in chronobiology is the location and molecular mechanism of the food-entrainable oscillator (FEO). ...

Abstract	A longstanding mystery in chronobiology is the location and molecular mechanism of the food-entrainable oscillator (FEO).
MeSH term(s)	Mice ; Animals ; Circadian Clocks ; Feeding Behavior ; Circadian Rhythm ; Photoperiod ; Suprachiasmatic Nucleus ; Mice, Knockout
Language	English
Publishing date	2023-11-10
Publishing country	England
Document type	Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	1071731-6
ISSN	1879-0445 ; 0960-9822
ISSN (online)	1879-0445
ISSN	0960-9822
DOI	10.1016/j.cub.2023.10.027
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Article ; Online: Multiscale Time-resolved Analysis Reveals Remaining Behavioral Rhythms in Mice Without Canonical Circadian Clocks.

Morris, Megan / Yamazaki, Shin / Stefanovska, Aneta

Journal of biological rhythms

2022 Volume 37, Issue 3, Page(s) 310–328

Abstract: Circadian rhythms are internal processes repeating approximately every 24 hours in living organisms. The dominant circadian pacemaker is synchronized to the environmental light-dark cycle. Other circadian pacemakers, which can have noncanonical circadian ...

Abstract	Circadian rhythms are internal processes repeating approximately every 24 hours in living organisms. The dominant circadian pacemaker is synchronized to the environmental light-dark cycle. Other circadian pacemakers, which can have noncanonical circadian mechanisms, are revealed by arousing stimuli, such as scheduled feeding, palatable meals and running wheel access, or methamphetamine administration. Organisms also have ultradian rhythms, which have periods shorter than circadian rhythms. However, the biological mechanism, origin, and functional significance of ultradian rhythms are not well-elucidated. The dominant circadian rhythm often masks ultradian rhythms; therefore, we disabled the canonical circadian clock of mice by knocking out
MeSH term(s)	Animals ; Circadian Clocks ; Circadian Rhythm ; Darkness ; Mammals ; Mice ; Photoperiod ; Ultradian Rhythm
Language	English
Publishing date	2022-05-16
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	896387-3
ISSN	1552-4531 ; 0748-7304
ISSN (online)	1552-4531
ISSN	0748-7304
DOI	10.1177/07487304221087065
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Article ; Online: Genetics and functional significance of the understudied methamphetamine sensitive circadian oscillator (MASCO).

Taufique, S K Tahajjul / Ehichioya, David E / Pendergast, Julie S / Yamazaki, Shin

F1000Research

2022 Volume 11, Page(s) 1018

Abstract: The last 50 years have witnessed extraordinary discoveries in the field of circadian rhythms. However, there are still several mysteries that remain. One of these chronobiological mysteries is the circadian rhythm that is revealed by administration of ... ...

Abstract	The last 50 years have witnessed extraordinary discoveries in the field of circadian rhythms. However, there are still several mysteries that remain. One of these chronobiological mysteries is the circadian rhythm that is revealed by administration of stimulant drugs to rodents. Herein we describe the discovery of this circadian rhythm and its underlying oscillator, which is frequently called the methamphetamine-sensitive circadian oscillator, or MASCO. This oscillator is distinct from canonical circadian oscillators because it controls robust activity rhythms independently of the suprachiasmatic nucleus and circadian genes are not essential for its timekeeping. We discuss these fundamental properties of MASCO and integrate studies of strain, sex, and circadian gene mutations on MASCO. The anatomical loci of MASCO are not known, so it has not been possible thus far to discover its novel molecular timekeeping mechanism or its functional significance. However, studies in mutant mice suggest that genetic approaches can be used to identify the neural network involved in the rhythm generation of MASCO. We also discuss parallels between human and rodent studies that support our working hypothesis that a function of MASCO may be to regulate sleep-wake cycles.
MeSH term(s)	Mice ; Humans ; Animals ; Methamphetamine/pharmacology ; Mice, Inbred C57BL ; Motor Activity/physiology ; Suprachiasmatic Nucleus/physiology ; Central Nervous System Stimulants/pharmacology ; Circadian Rhythm/genetics
Chemical Substances	Methamphetamine (44RAL3456C) ; Central Nervous System Stimulants
Language	English
Publishing date	2022-09-08
Publishing country	England
Document type	Journal Article ; Review
ZDB-ID	2699932-8
ISSN	2046-1402 ; 2046-1402
ISSN (online)	2046-1402
ISSN	2046-1402
DOI	10.12688/f1000research.125432.2
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Article: Gut microbiota depletion minimally affects the daily voluntary wheel running activity and food anticipatory activity in female and male C57BL/6J mice.

Ehichioya, David E / Taufique, S K Tahajjul / Magaña, Isabel / Farah, Sofia / Obata, Yuuki / Yamazaki, Shin

Frontiers in physiology

2023 Volume 14, Page(s) 1299474

Abstract: Emerging evidence has highlighted that the gut microbiota plays a critical role in the regulation of various aspects of mammalian physiology and behavior, including circadian rhythms. Circadian rhythms are fundamental behavioral and physiological ... ...

Abstract	Emerging evidence has highlighted that the gut microbiota plays a critical role in the regulation of various aspects of mammalian physiology and behavior, including circadian rhythms. Circadian rhythms are fundamental behavioral and physiological processes that are governed by circadian pacemakers in the brain. Since mice are nocturnal, voluntary wheel running activity mostly occurs at night. This nocturnal wheel-running activity is driven by the primary circadian pacemaker located in the suprachiasmatic nucleus (SCN). Food anticipatory activity (FAA) is the increased bout of locomotor activity that precedes the scheduled short duration of a daily meal. FAA is controlled by the food-entrainable oscillator (FEO) located outside of the SCN. Several studies have shown that germ-free mice and mice with gut microbiota depletion altered those circadian behavioral rhythms. Therefore, this study was designed to test if the gut microbiota is involved in voluntary wheel running activity and FAA expression. To deplete gut microbiota, C57BL/6J wildtype mice were administered an antibiotic cocktail via their drinking water throughout the experiment. The effect of antibiotic cocktail treatment on wheel running activity rhythm in both female and male mice was not detectable with the sample size in our current study. Then mice were exposed to timed restricted feeding during the day. Both female and male mice treated with antibiotics exhibited normal FAA which was comparable with the FAA observed in the control group. Those results suggest that gut microbiota depletion has minimum effect on both circadian behavioral rhythms controlled by the SCN and FEO respectively. Our result contradicts recently published studies that reported significantly higher FAA levels in germ-free mice compared to their control counterparts and gut microbiota depletion significantly reduced voluntary activity by 50%.
Language	English
Publishing date	2023-12-01
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2564217-0
ISSN	1664-042X
ISSN	1664-042X
DOI	10.3389/fphys.2023.1299474
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Article ; Online: Evaluation of temperature-dependent fluctuations in skin microcirculation flow using a light-emitting diode based photoacoustic imaging device.

Ito, Yosuke / Ishii, Takuro / Yamazaki, Shin / Yoshida, Akiko / Nagaya, Kei / Saijo, Yoshifumi

Journal of clinical monitoring and computing

2023 Volume 37, Issue 5, Page(s) 1361–1367

Abstract: Purpose: Skin microvessels maintain temperature homeostasis by contracting and dilating upon exposure to changes in temperature. Under general anesthesia, surgical invasiveness, including incisions and coagulation, and the effects of anesthetics may ... ...

Abstract	Purpose: Skin microvessels maintain temperature homeostasis by contracting and dilating upon exposure to changes in temperature. Under general anesthesia, surgical invasiveness, including incisions and coagulation, and the effects of anesthetics may cause variations in the threshold temperature, leading to the constriction and dilation of cutaneous blood vessels. Therefore, studies on skin microvascular circulation are necessary to develop appropriate interventions for complications during surgery. Methods: We visualized and quantified skin microcirculatory fluctuations associated with temperature variations using a light-emitting diode photoacoustic imaging (LED-PAI) device. The hands of ten healthy volunteers were stressed with four different water temperatures [25℃ (Control), 15℃ (Cold1), 40℃ (Warm), and 15℃ (Cold2)]. The photoacoustic images of the fingers were taken under each condition, and the microvascular flow owing to temperature stress was quantified as the area of photoacoustic signal (S) in each image. The S values were compared with the variations in blood flow (Q) measured by laser Doppler flowmetry (LDF). Results: The correlation between Q and S according to the 40 measurements was r = 0.45 (p＜0.01). In addition, the values of S under each stress condition were as follows: S Conclusion: These findings suggest that the LED-PAI device could be an option for evaluating microcirculation in association with changes in temperature.
MeSH term(s)	Humans ; Microcirculation ; Temperature ; Photoacoustic Techniques ; Skin/blood supply ; Hemodynamics ; Regional Blood Flow/physiology ; Laser-Doppler Flowmetry/methods
Language	English
Publishing date	2023-05-11
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	1418733-4
ISSN	1573-2614 ; 1387-1307 ; 0748-1977
ISSN (online)	1573-2614
ISSN	1387-1307 ; 0748-1977
DOI	10.1007/s10877-023-01026-0
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Article ; Online: The Mysterious Food-Entrainable Oscillator: Insights from Mutant and Engineered Mouse Models.

Pendergast, Julie S / Yamazaki, Shin

Journal of biological rhythms

2018 Volume 33, Issue 5, Page(s) 458–474

Abstract: The food-entrainable oscillator (FEO) is a mysterious circadian clock because its anatomical location(s) and molecular timekeeping mechanism are unknown. Food anticipatory activity (FAA), which is defined as the output of the FEO, emerges during ... ...

Abstract	The food-entrainable oscillator (FEO) is a mysterious circadian clock because its anatomical location(s) and molecular timekeeping mechanism are unknown. Food anticipatory activity (FAA), which is defined as the output of the FEO, emerges during temporally restricted feeding. FAA disappears immediately during ad libitum feeding and reappears during subsequent fasting. A free-running FAA rhythm has been observed only in rare circumstances when food was provided with a period outside the range of entrainment. Therefore, it is difficult to study the circadian properties of the FEO. Numerous studies have attempted to identify the critical molecular components of the FEO using mutant and genetically engineered mouse models. Herein we critically review the experimental protocols and findings of these studies in mouse models. Several themes emerge from these studies. First, there is little consistency in restricted feeding protocols between studies. Moreover, the protocols were sometimes not optimal, resulting in erroneous conclusions that FAA was absent in some mouse models. Second, circadian genes are not necessary for FEO timekeeping. Thus, another noncanonical timekeeping mechanism must exist in the FEO. Third, studies of mouse models have shown that signaling pathways involved in circadian timekeeping, reward (dopaminergic), and feeding and energy homeostasis can modulate, but are not necessary for, the expression of FAA. In sum, the approaches to date have been largely unsuccessful in discovering the timekeeping mechanism of the FEO. Moving forward, we propose the use of standardized and optimized experimental protocols that focus on identifying genes that alter the period of FAA in mutant and engineered mouse models. This approach is likely to permit discovery of molecular components of the FEO timekeeping mechanism.
MeSH term(s)	Animals ; Animals, Genetically Modified ; Biological Clocks ; Circadian Rhythm/genetics ; Fasting ; Feeding Behavior ; Food ; Mice ; Mice, Inbred C57BL ; Motor Activity ; Period Circadian Proteins/genetics
Chemical Substances	Period Circadian Proteins
Language	English
Publishing date	2018-07-23
Publishing country	United States
Document type	Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
ZDB-ID	896387-3
ISSN	1552-4531 ; 0748-7304
ISSN (online)	1552-4531
ISSN	0748-7304
DOI	10.1177/0748730418789043
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Article: [Public health for scientific study of society and health (3) "Communication through environmental epidemiology"].

Yamazaki, Shin

Nihon koshu eisei zasshi] Japanese journal of public health

2011 Volume 58, Issue 2, Page(s) 138–141

MeSH term(s)	Communication ; Epidemiologic Studies ; Humans ; Risk
Language	Japanese
Publishing date	2011-02
Publishing country	Japan
Document type	Journal Article
ZDB-ID	45044-3
ISSN	0546-1766
ISSN	0546-1766
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Article ; Online: Association between prenatal cadmium exposure and child development: The Japan Environment and Children's study.

Masumoto, Toshio / Amano, Hiroki / Otani, Shinji / Kamijima, Michihiro / Yamazaki, Shin / Kobayashi, Yayoi / Kurozawa, Youichi

International journal of hygiene and environmental health

2022 Volume 243, Page(s) 113989

Abstract: Cadmium is a heavy metal that can be found in soil, air, food, and water. Cadmium has toxic effects on the kidneys, bones, and respiratory system. Prenatal exposure to cadmium has been found to affect the mental development of children, but inconsistent ... ...

Abstract	Cadmium is a heavy metal that can be found in soil, air, food, and water. Cadmium has toxic effects on the kidneys, bones, and respiratory system. Prenatal exposure to cadmium has been found to affect the mental development of children, but inconsistent results have been found in different studies. Therefore, it is unknown that prenatal cadmium exposure associated with child development after birth. To elucidate whether cadmium affect the child development or not, we analyzed nation-wide cohort study data, the Japan Environment and Children's Study. Prenatal cadmium concentrations in blood from mothers in the second or third trimester were determined by inductively coupled plasma mass spectrometry. Child development was evaluated using "Ages and Stages" questionnaires. The association between cadmium and child development were investigated by performing logistic regression analyses, multinomial logistic regression analyses and generalized linear mixed model using the child development parameters as dependent variables and the cadmium concentrations in maternal blood as the independent variable. There were significant associations between the cadmium concentration and child development at 6 months, 1 year, and 1.5 years after birth. However, the effect had disappeared at 2 years after birth or later. The number of developmental delays was positively associated with the cadmium concentration after adjusting individual difference. The results indicate that prenatal exposure affects child development, but the effect decreases with age.
MeSH term(s)	Cadmium ; Child ; Child Development ; Cohort Studies ; Female ; Humans ; Japan ; Maternal Exposure ; Pregnancy ; Prenatal Exposure Delayed Effects ; Prospective Studies
Chemical Substances	Cadmium (00BH33GNGH)
Language	English
Publishing date	2022-05-28
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2009176-X
ISSN	1618-131X ; 1438-4639
ISSN (online)	1618-131X
ISSN	1438-4639
DOI	10.1016/j.ijheh.2022.113989
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