Changes in expression of hepatic circadian clock gene in different types of circadian rhythm and effect of isoflurane anesthesia on expression of hepatic circadian clock gene in mice
10.3760/cma.j.issn.0254-1416.2014.12.003
- VernacularTitle:不同昼夜节律下小鼠肝脏生物钟基因表达的变化及异氟醚麻醉对肝脏生物钟基因表达的影响
- Author:
Yin CUI
;
Tianjiao XIA
;
Zhengliang MA
;
Xiaoping GU
- Publication Type:Journal Article
- Keywords:
Circadian rhythm;
Anesthesia;
Biological clocks
- From:
Chinese Journal of Anesthesiology
2014;34(12):1425-1429
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the changes in the expression of hepatic circadian clock gene in different types of circadian rhythm and the effect of isoflurane anesthesia on the expression of hepatic circadian clwk gene in mice.Methods Seventy-two male C57/B6 mice,aged 2 months,weighing 20-25 g,were randomly divided into 3 groups (n =24 each):normal light/dark (LD) cycle group,reversal LD cycle group and anesthesia group.Normal LD cycle group and anesthesia groupwere maintained in a regular 12 h LD cycle with lights on at 8:00 am and off at 8:00 pm for 3 weeks,and in addition anesthesia was then performed with isoflurane in anesthesia group.Reversal LD cycle group was kept in an inverted12 h LD cycle with lights on at 8:00 pm and off at 8:00 am for 3 weeks.The natural time was converted to circadian time (CT) and the initial time was set at CT0.Isoflurane anesthesia group was exposed to 2％ isoflurane for 6 h during the wakening period from CT14 to CT20.The liver and suprachiasmatic nucleus (SCN) were removed from mice at CT2,CT8,CT14 and CT20 for determination of Clock and Cry1 mRNA expression by real-time quantitative PCR.Results Clock and Cry1 mRNA expression in the liver and SCN showed rhythm in the two different types of circadian rhythm.Compared with that in SCN,the peak phase of Clock and Cry1 mRNA expression in livers was delayed in two different types of circadian rhythm.Isoflurane anesthesia caused a peak phase delay of Cry1 and Clock mRNA expression in livers as compared with normal LD cycle group.Conclusion Circadian clock gene in livers shows rhythmic expression in different types of circadian rhythm,and isoflurane anesthesia can cause a large peak phase delay of circadian clock gene expression in livers of mice.
