脑室注射和饲料缺乏组氨酸或缬氨酸对翘嘴鳜摄食的调控作用
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Regulatory effects of intracerebroventricular injection and deprived feed of histidine or valine on feeding of Chinese perch (Siniperca chuatsi
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    摘要:

    为研究中枢神经对营养物的直接感知及外周组织的间接感知,以翘嘴鳜(Siniperca chuatsi)为试验对象,通过脑室注射和饲料缺乏方式探索组氨酸或缬氨酸对翘嘴鳜摄食的影响。脑室注射试验中,对照组注射磷酸盐缓冲液(PBS),试验组注射组氨酸或缬氨酸或同时注射一般性调控阻遏蛋白激酶2 (general control non-derepressible-2,GCN2)的抑制剂GCN2iB,检测注射后1 h和4 h翘嘴鳜的摄食量变化。饲料缺乏试验中,对照组投喂氨基酸完全饲料,试验组投喂组氨酸或缬氨酸缺乏饲料,检测翘嘴鳜的摄食量、GCN2信号通路相关因子及食欲基因的变化。结果显示,与对照组相比,注射组氨酸或缬氨酸均显著降低了翘嘴鳜的摄食量;同时注射GCN2iB和组氨酸可使翘嘴鳜的摄食量恢复至正常水平。与对照组相比,投喂缺乏组氨酸或缬氨酸的饲料,翘嘴鳜的摄食量显著减少,且GCN2信号通路下游激活转录因子4 (activating transcriptional factor 4,atf4) mRNA表达水平显著降低,下丘脑中食欲因子神经肽Y 基因(neuropeptide Y,npy)的mRNA表达水平显著降低,但刺鼠相关蛋白(agouti-related protein,agrp)、促黑素细胞皮质素原(pro-opiomelanocortin,pomc可卡因-苯丙胺转录调节肽(amphetamine-regulated transcript,cart)基因的mRNA表达水平无显著变化。综上所述,组氨酸和缬氨酸通过脑室注射和饲料缺乏的方式均可抑制翘嘴鳜摄食,且翘嘴鳜摄食行为的变化与GCN2信号通路有关,饲料缺乏组氨酸或缬氨酸可能是通过下调促食欲因子npy基因的表达起到抑食作用。

    Abstract:

    The regulatory effects of intracerebroventricular (ICV) injection and deprived feed of histidine or valine on the feeding of Chinese perch (Siniperca chuatsi) were studied to explore the direct signal perception of the central nervous system and the indirect signal perception of the peripheral tissues. In the ICV injection test,the control group was injected with phosphate buffered saline (PBS),and the experimental group was injected with histidine or valine or simultaneously with an inhibitor of general control non-derepressible-2 (GCN2) GCN2iB. The changes in food intake of Chinese perch at 1 h and 4 h after injection were detected. In the feed deprivation test,the control group was fed with amino acid complete feed and the experimental group was fed with deprived feed of histidine or valine. The changes in food intake,GCN2 signaling pathway-related factors and appetite genes were detected. The results showed that the injection of either histidine or valine significantly reduced the food intake of Chinese perch compared with the control group (P<0.05). Simultaneous injection of GCN2iB and histidine restored the food intake of Chinese perch to normal levels. Compared with the control group,the intake of deprived feed of histidine or valine was significantly decreased (P<0.05). Moreover,the mRNA expression of activating transcriptional factor 4 (atf4),a key activating transcription factor downstream of GCN2 signaling pathway,was significantly down-regulated (P<0.05) in deprived feed of histidine or valine. The mRNA expression level of the appetite factor neuropeptide Y (npy) in the hypothalamus was significantly decreased (P<0.05). However,there were no significant changes in the mRNA expression levels of agouti-related protein (agrp),pro-opiomelanocortin (pomc),and amphetamine-regulated transcript (cart) genes. In conclusion,both histidine and valine can inhibit the feeding behavior of Chinese perch via ICV administration and feed deprivation. The changes of feeding behavior of Chinese perch are related to the GCN2 signaling pathway. The deprived feed of histidine or valine might result in the anorexia by down-regulating the expression of appetite-stimulating factor npy gene.

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邹家明,何珊,梁旭方,朱强胜.脑室注射和饲料缺乏组氨酸或缬氨酸对翘嘴鳜摄食的调控作用[J].华中农业大学学报,2022,41(2):168-175

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  • 在线发布日期: 2022-04-02
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