Daily rhythms of nonshivering thermogenesis in common spiny mice Acomys cahirinus under short and long photoperiods

A. Haim; N. Zisapel

doi:10.1016/S0306-4565(99)00055-8

Daily rhythms of nonshivering thermogenesis in common spiny mice Acomys cahirinus under short and long photoperiods

A. Haim, N. Zisapel

School of Public Health

Research output: Contribution to journal › Article › peer-review

Abstract

Daily rhythms of nonshivering thermogenesis NST were studied in common spiny mice Acomys cahirinus, acclimated to different photoperiod regimes (16L:8D and 8L:16D) at a constant ambient temperature of 26°C. Noradrenaline NA (1.5 mg/kg subcutaneous) was injected at: 06:00, 12:00, 18:00 and 24:00 h (±15 min). NST was measured as the ratio between the maximal oxygen consumption (VO₂) as response to NA - VO₂NA and VO₂ measured at 26°C - VO(₂ min). Rectal temperatures T(b)NA and T(b)(min) respectively were recorded at the end of VO₂ measurements. Significant variations in T(b)(min), T(b)NA, and NST were revealed, under the two different photoperiod regimes. Significant differences in VO(₂ min) NST, T(b)(min) and T(b)NA were also recorded within each photoperiod acclimation group. These results suggest that daily and photoperiod depended variations in the brown adipose tissue activity, presumably emerge from amount of unoccupied receptors or changes in the receptors affinity to NA.

Original language	English
Pages (from-to)	455-459
Number of pages	5
Journal	Journal of Thermal Biology
Volume	24
Issue number	5-6
DOIs	https://doi.org/10.1016/S0306-4565(99)00055-8
State	Published - Oct 1999

Bibliographical note

Funding Information:
The authors thank Mr H. Kosik for the maintenance of the common spiny mice colony. This research was supported by the U.S.–Israel Binational Scientific Foundation, Grant No. 91-00248.

Keywords

Arid environment
Body temperature
Brown adipose tissue
Daily rhythms
Metabolic rates
Nocturnal activity
Nonshivering thermogenesis
Noradrenaline
Oxygen consumption
Photoperiod manipulations
Rodents
Spiny mice

ASJC Scopus subject areas

Biochemistry
Physiology
Agricultural and Biological Sciences (all)
Developmental Biology

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10.1016/S0306-4565(99)00055-8

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title = "Daily rhythms of nonshivering thermogenesis in common spiny mice Acomys cahirinus under short and long photoperiods",

abstract = "Daily rhythms of nonshivering thermogenesis NST were studied in common spiny mice Acomys cahirinus, acclimated to different photoperiod regimes (16L:8D and 8L:16D) at a constant ambient temperature of 26°C. Noradrenaline NA (1.5 mg/kg subcutaneous) was injected at: 06:00, 12:00, 18:00 and 24:00 h (±15 min). NST was measured as the ratio between the maximal oxygen consumption (VO2) as response to NA - VO2NA and VO2 measured at 26°C - VO(2 min). Rectal temperatures T(b)NA and T(b)(min) respectively were recorded at the end of VO2 measurements. Significant variations in T(b)(min), T(b)NA, and NST were revealed, under the two different photoperiod regimes. Significant differences in VO(2 min) NST, T(b)(min) and T(b)NA were also recorded within each photoperiod acclimation group. These results suggest that daily and photoperiod depended variations in the brown adipose tissue activity, presumably emerge from amount of unoccupied receptors or changes in the receptors affinity to NA.",

keywords = "Arid environment, Body temperature, Brown adipose tissue, Daily rhythms, Metabolic rates, Nocturnal activity, Nonshivering thermogenesis, Noradrenaline, Oxygen consumption, Photoperiod manipulations, Rodents, Spiny mice",

author = "A. Haim and N. Zisapel",

note = "Funding Information: The authors thank Mr H. Kosik for the maintenance of the common spiny mice colony. This research was supported by the U.S.–Israel Binational Scientific Foundation, Grant No. 91-00248. ",

year = "1999",

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doi = "10.1016/S0306-4565(99)00055-8",

language = "English",

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pages = "455--459",

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AU - Haim, A.

AU - Zisapel, N.

N1 - Funding Information: The authors thank Mr H. Kosik for the maintenance of the common spiny mice colony. This research was supported by the U.S.–Israel Binational Scientific Foundation, Grant No. 91-00248.

PY - 1999/10

Y1 - 1999/10

N2 - Daily rhythms of nonshivering thermogenesis NST were studied in common spiny mice Acomys cahirinus, acclimated to different photoperiod regimes (16L:8D and 8L:16D) at a constant ambient temperature of 26°C. Noradrenaline NA (1.5 mg/kg subcutaneous) was injected at: 06:00, 12:00, 18:00 and 24:00 h (±15 min). NST was measured as the ratio between the maximal oxygen consumption (VO2) as response to NA - VO2NA and VO2 measured at 26°C - VO(2 min). Rectal temperatures T(b)NA and T(b)(min) respectively were recorded at the end of VO2 measurements. Significant variations in T(b)(min), T(b)NA, and NST were revealed, under the two different photoperiod regimes. Significant differences in VO(2 min) NST, T(b)(min) and T(b)NA were also recorded within each photoperiod acclimation group. These results suggest that daily and photoperiod depended variations in the brown adipose tissue activity, presumably emerge from amount of unoccupied receptors or changes in the receptors affinity to NA.

AB - Daily rhythms of nonshivering thermogenesis NST were studied in common spiny mice Acomys cahirinus, acclimated to different photoperiod regimes (16L:8D and 8L:16D) at a constant ambient temperature of 26°C. Noradrenaline NA (1.5 mg/kg subcutaneous) was injected at: 06:00, 12:00, 18:00 and 24:00 h (±15 min). NST was measured as the ratio between the maximal oxygen consumption (VO2) as response to NA - VO2NA and VO2 measured at 26°C - VO(2 min). Rectal temperatures T(b)NA and T(b)(min) respectively were recorded at the end of VO2 measurements. Significant variations in T(b)(min), T(b)NA, and NST were revealed, under the two different photoperiod regimes. Significant differences in VO(2 min) NST, T(b)(min) and T(b)NA were also recorded within each photoperiod acclimation group. These results suggest that daily and photoperiod depended variations in the brown adipose tissue activity, presumably emerge from amount of unoccupied receptors or changes in the receptors affinity to NA.

KW - Arid environment

KW - Body temperature

KW - Brown adipose tissue

KW - Daily rhythms

KW - Metabolic rates

KW - Nocturnal activity

KW - Nonshivering thermogenesis

KW - Noradrenaline

KW - Oxygen consumption

KW - Photoperiod manipulations

KW - Rodents

KW - Spiny mice

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JO - Journal of Thermal Biology

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IS - 5-6

ER -

Daily rhythms of nonshivering thermogenesis in common spiny mice Acomys cahirinus under short and long photoperiods

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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