Effects of Light Intensity on c-fos, Biological Clock Gene Expression and Melatonin in Cherry Valley Meat Ducks
CUI JiaJie, XIE Qiang, ZHAI ShuangShuang, GONG Tao, ZHU YongWen, YANG Lin,, WANG WenCe,College of Animal Science, South China Agricultural University/Guangdong Provincial Key Laboratory of Animal Nutrition and Regulation, Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642
Abstract 【Objective】 The objective of this study was to investigate the effects of different intensities of light stimulation on c-fos and related clock genes in hypothalamus, diencephalon, pituitary and mesencephalon, as well as melatonin levels in plasma and liver of cherry valley meat duck under continuous darkness. 【Method】 A total of one hundred and forty four 1-day-old cherry valley meat ducks were raised to the age of 21 days. 22-day-old cherry valley meat ducks were randomly divided into 2 groups. Each group had 6 replicates, with 12 ducks per replicate, and kept dark for 7 days, the ducks were given ad libitum access to water and feed. After 7 days lasting darkness, 28-day-old ducks received a LED white light stimulation of different intensities for 1.5 h and then a dark adaptation for 1.5 h. One duck from each replicate was slaughted for sample collection, the expression levels of c-fos and circadian clock genes in the hypothalamus, diencephalon, pituitary and mesencephalon were measured, and plasma and liver melatonin levels were measured. 【Result】 The expression level of c-fos in hypothalamus and mesencephalon of the 10 Lx group was significantly higher than that in the 80 Lx group (P<0.05). The level of c-fos in the diencephalon was significantly lower than that in the 80 Lx group (P<0.05), and there was no significant difference of c-fos expression in pituitary in the two groups(P>0.05). Compared with the 80 Lx group, the expression of clock gene clock, Bmal1, Bmal2 and Per2 in the 10 Lx group in the hypothalamus was significantly increased (P<0.05), and the expression of Cry1 was little increased in the 10 Lx group (P=0.06) .The expression level of Bmal1 in the diencephalon was significantly higher in the 10 Lx group (P<0.05), while Bmal2, Clock, Per2 and Cry1 showed no significant difference (P>0.05) in two groups. The expression of Clock and Per2 in the mesencephalon was significantly higher in the 10 Lx group than that in the 80 Lx group (P<0.05). The expression of Bmal1, Bmal2 and Cry1 in the two groups had no significant difference (P>0.05). The expression of clock genes in pituitary was not significant affect by light intensity (P>0.05). Compared with the 80 Lx, the plasma level of melatonin in 10 Lx group was significantly lower (P<0.05), while the melatonin levels in the liver were significantly higher. 【Conclusion】 In the continuous darkness, transient high intensity light stimulation could inhibit the expression of c-fos in the hypothalamus and mesencephalon, and increase the expression of c-fos in the diencephalon, while the stimulation could attenuate the amplitude of gene expression in the hypothalamus and diencephalon of the meat duck. Keywords:cherry valley meat duck;continuous darkness;light intensity;c-fos;biological clock
PDF (452KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 崔家杰, 谢强, 翟双双, 龚涛, 朱勇文, 杨琳, 王文策. 光照强度对樱桃谷肉鸭c-fos、生物钟基因表达 及褪黑激素的影响[J]. 中国农业科学, 2020, 53(4): 848-856 doi:10.3864/j.issn.0578-1752.2020.04.016 CUI JiaJie, XIE Qiang, ZHAI ShuangShuang, GONG Tao, ZHU YongWen, YANG Lin, WANG WenCe. Effects of Light Intensity on c-fos, Biological Clock Gene Expression and Melatonin in Cherry Valley Meat Ducks[J]. Scientia Acricultura Sinica, 2020, 53(4): 848-856 doi:10.3864/j.issn.0578-1752.2020.04.016
1.3.4 引物合成和荧光定量PCR 根据GenBank公布的绿头鸭基因的mRNA序列设计引物序列(表1),由上海生工生物合成。采用SYBR Green (TOYOBO,日本)染料法在ABI7500(Applied Bio-systems, Foster City,美国)上进行RT-qPCR,PCR反应条件为95℃预变性30 s ,然后95℃变性5 s ,退火温度60℃ 34 s共40个循环。用β-actin作为内参,采用2-ΔΔCT法对荧光定量PCR结果进行数据处理。
Table 2 表2 表2不同光照强度处理对肉鸭Bmal1 mRNA相对表达量的影响 Table 2Effects of different light intensity treatments on the relative expression of Bmal1 mRNA in meat ducks
10 Lx
80 Lx
标准误 Sem
P值 P value
下丘脑Hypothalamus
1.15A
0.87B
0.05
<0.01
间脑Diencephalon
1.43A
0.76B
0.08
<0.01
垂体Pituitary
1.20
1.04
0.19
0.60
中脑Mesencephalon
1.26
1.20
0.20
0.87
同行数据标有不同大写字母者表示差异极显著(P<0.01),标有不同小写字母者表示差异显著(P<0.05),未标字母者差异不显著(P>0.05)。下同 In the same row, values with different capital letter mean extremely significant difference (P<0.01), values with different small letter mean significant difference(P<0.05), with no letter mean no significant difference(P>0.05).The same as below
Table 3 表3 表3不同光照强度处理对肉鸭Bmal2 mRNA相对表达量的影响 Table 3Effects of different light intensity treatments on the relative expression of Bmal2 mRNA in meat ducks
Table 4 表4 表4不同光照强度处理对肉鸭Clock mRNA相对表达量的影响 Table 4Effects of different light intensity treatments on the relative expression of Clock mRNA in meat ducks
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