Wheel-running activity rhythms and masking responses in the diurnal palm squirrel, Funambulus pennantii

Kumar, Dhiraj; Soni, Sanjeev Kumar; Kronfeld‐Schor, Noga; Singaravel, Muniyandi

doi:10.1080/07420528.2020.1826959

Cited by 8 publications

(4 citation statements)

References 68 publications

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“…ALAN refers to both an increase in light intensity and changes in the naturally occurring light spectrum. ALAN causes changes in the behavior and temporal activity of many animals, such as birds [ 13 , 14 ], rodents [ 15 ], anurans [ 16 ], and insects [ 17 , 18 ]. ALAN impairs sleeping behavior [ 19 ], camouflage, and population synchronization [ 17 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Transcriptional Response of Circadian Clock Genes to an ‘Artificial Light at Night’ Pulse in the Cricket Gryllus bimaculatus

Levy

Fishman

Barnea

et al. 2022

IJMS

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Light is the major signal entraining the circadian clock that regulates physiological and behavioral rhythms in most organisms, including insects. Artificial light at night (ALAN) disrupts the natural light–dark cycle and negatively impacts animals at various levels. We simulated ALAN using dim light stimuli and tested their impact on gene expression in the cricket Gryllus bimaculatus, a model of insect physiology and chronobiology. At night, adult light–dark-regime-raised crickets were exposed for 30 min to a light pulse of 2–40 lx. The relative expression of five circadian-clock-associated genes was compared using qPCR. A dim ALAN pulse elicited tissue-dependent differential expression in some of these genes. The strongest effect was observed in the brain and in the optic lobe, the cricket’s circadian pacemaker. The expression of opsin-Long Wave (opLW) was upregulated, as well as cryptochrome1-2 (cry) and period (per). Our findings demonstrate that even a dim ALAN exposure may affect insects at the molecular level, underscoring the impact of ALAN on the circadian clock system.

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Section: Introductionmentioning

confidence: 99%

Transcriptional Response of Circadian Clock Genes to an ‘Artificial Light at Night’ Pulse in the Cricket Gryllus bimaculatus

Levy

Fishman

Barnea

et al. 2022

IJMS

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“…Regular physical exercise promotes good health 14 , 15 and in both natural and laboratory settings, rodents voluntarily exercise vigorously in running wheels. 16 , 17 , 18 Exercising at the same time of day through timed daily access to a running wheel, or scheduled voluntary exercise (SVE), is an effective non-photic cue for rodents. 19 , 20 Indeed, SVE can restore some SCN function and promote 24h behavioral rhythms in Vipr2 −/− mice.…”

Section: Introductionmentioning

confidence: 99%

Timed exercise stabilizes behavioral rhythms but not molecular programs in the brain’s suprachiasmatic clock

et al. 2023

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“…While the sleep-promoting effects of melatonin are known [59][60][61][62][63][64], it has been shown that melatonin does not induce a sleep-promoting effect [65,66] in F. pennantii. Another study proved that pinealectomy did not alter general locomotor activity rhythm in Avicanthis niloticus.…”

mentioning

confidence: 99%

“…Kumar et al [65] demonstrated that squirrels exposed to a 3.5:3.5 h cycle exhibited a prominent masking response. Additionally, exposure to light results in a significant increase in activity during the light phase compared to the dark, demonstrating that diurnal squirrels are positively masked by light.…”

mentioning

confidence: 99%

Impact of a Single Episode of Different Intensity of White Light Pulse at Night on Masking Response in the Diurnal Mammal, Funambulus pennantii

Verma,

Basu,

Singaravel

2023

Chronobiol Med

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Objective: Light affects mammalian circadian rhythms through entrainment and masking. Photic masking increases locomotor activity in diurnal species (positive masking) while reducing activity in nocturnal species (negative masking). Fewer studies have investigated masking in diurnal rodents. We investigated the masking response in a diurnal rodent, Funambulus pennantii when subjected to white light pulses of different intensities at night between zeitgeber time (ZT) 12 and ZT 15.Methods: Adult male squirrels, F. pennantii (n=10/group, three groups) were placed in individual cages with running wheels under standard 12:12 h light-dark (LD) conditions. Recording of the locomotor activity rhythm was carried out using a ClockLab setup. Following a week of stable entrainment to the LD cycle, the animals of each group were given a sham exposure. After 10 days, animals of group I, II, and III were exposed to 3-h white light pulses of 100 lux, 10 lux, and 1 lux, respectively, between ZT 12 and ZT 15. Following the exposure, the animals were allowed to run undisturbed for 7 days.Results: Compared to the shamexposed group, exposure to 3-h 1 lux, 10 lux, and 100 lux artificial light pulses at night caused positive masking, stimulating wheel running in an intensity-dependent manner. Additionally, nighttime light pulses of 100 lux and 10 lux reduced onset accuracy, reduced the amplitude of the rhythm, and also altered the phase angle relationship to light.Conclusion: The positive masking caused by light exposure at night in diurnal squirrels is intensity-dependent up to at least 100 lux and is associated with a dampening of circadian rhythms.

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Wheel-running activity rhythms and masking responses in the diurnal palm squirrel, Funambulus pennantii

Cited by 8 publications

References 68 publications

Transcriptional Response of Circadian Clock Genes to an ‘Artificial Light at Night’ Pulse in the Cricket Gryllus bimaculatus

Transcriptional Response of Circadian Clock Genes to an ‘Artificial Light at Night’ Pulse in the Cricket Gryllus bimaculatus

Timed exercise stabilizes behavioral rhythms but not molecular programs in the brain’s suprachiasmatic clock

Impact of a Single Episode of Different Intensity of White Light Pulse at Night on Masking Response in the Diurnal Mammal, Funambulus pennantii

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