

FOLLOWUS
1. College of Marine Technology and Environment, Dalian Ocean University, Dalian 116023, China
2. College of Fisheries, Chinese Perch Research Center, Huazhong Agricultural University, Wuhan 430070, China
3. Innovation Base for Chinese Perch Breeding, Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, Wuhan 430070, China
** xfliang@mail.hzau.edu.cn
Received:22 November 2021,
Revised:2022-02-08,
Accepted:27 May 2022,
Published:2023
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Jun YANG, Yulan KUANG, Xufang LIANG, et al. Effect of
Carnivorous fish have poor tolerance to carbohydrate in feed and low utilization rate of carbohydrate. Therefore
the balance of carbohydrate and lipids in the nutrient metabolism of carnivorous fish
the effective conversion and utilization of carbohydrate and lipids
and the feedback regulation of feeding are the key links for the efficient utilization of carnivorous fish feed. Carbohydrate response element binding protein (ChREBP) is a new transcription factor found in recent years in the glucose signaling pathway
and can also participate in feeding regulation. We performed in-vivo and in-vitro experiments to reveal the role of ChREBP in the glucose metabolism and feeding in mandarin fish. The mRNA expression of
ChREBP
and appetite regulatory factors were measured after intraperitoneal injection of glucose in mandarin fish
Siniperca chuatsi
and cotransfection with glucose and glucose+siRNA in the hypothalamic cells in mandarin fish. The results reveal that at hour 2 and 4 post intraperitoneal injection with 1 mg/g BW glucose
the blood glucose level of the mandarin fish increased significantly
but food intake decreased significantly
and it also displayed a significantly increased
ChREBP
mRNA expression levels in liver. At hour 4 post injection
hypothalamic
ChREBP
mRNA level was significantly increased
whereas the mRNA expressi
on levels of appetite genes neuropeptide Y (
npy
) and agouti-related peptide (
AgRP
) were decreased significantly. When the glucose concentration was 40 mmol/L
the expression level of
ChREBP
mRNA in mandarin fish hypothalamic cells was significantly up-regulated
but the expression level of appetite gene
npy
mRNA was down-regulated. When siRNA and glucose were co-transfected into mandarin fish brain cells
the expression level of chrebp mRNA was significantly decreased
and the appetite gene
npy
mRNA was significantly increased. The results indicated that glucose regulated food intake through the modulation of appetite gene
npy
by C
hREBP
.
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