斯佩克辛在草鱼 (Ctenopharyngodon idella) 中作为一种新的降糖因子
Yingxin Zhang1, Junli Wang1, Liping Yang2
1College of Life Science, Henan Normal University, No. 46 Jianshe Road, Xinxiang, 453007, PR China.
Biochemical and biophysical research communications
|March 26, 2024
概括
草中的Spexin-1 (SPX1) 和Spexin-2 (SPX2) 调节葡萄糖代谢. 虽然两者都间接增强胰岛素活性,但它们对糖解和糖原合成有相反的直接影响.
科学领域:
- 比较生理学比较生理学
- 内分泌学 在内分泌学.
- 鱼的新陈代谢 鱼的新陈代谢
背景情况:
- 鱼类中葡萄糖代谢的荷尔蒙调节对于代谢平衡至关重要.
- 斯佩克辛 (SPX) 是一种涉及新陈代谢调节的保存激素,包括体重和胰岛素抵抗.
- 了解spexin在鱼类葡萄糖代谢中的作用对于水产养殖和比较内分泌学至关重要.
研究的目的:
- 在草鱼 (Ctenopharyngodon idella) 中克隆spexin-2 (spx2) 基因.
- 为了研究spx1和spx2在草中的组织分布.
- 阐明SPX1和SPX2对草鱼葡萄糖代谢的直接和间接调节作用.
主要方法:
- 在草中克隆spx2开放阅读框架 (ORF).
- 在不同组织中对spx1和spx2基因表达的定量分析.
- 使用初级肝细胞进行体外研究,以评估对糖解路径的影响.
- 在体内实验涉及内注射SPX1和SPX2以测量血清葡萄糖和肝胰腺糖原水平.
- 通过RT-qPCR分析关键基因表达与糖解和糖原合成相关的基因表达 (pk, gys, pfkla, g6pase, pepck, pygl).
主要成果:
- 草中的spx2 ORF长度为279bp.
- SPX1在脂肪组织中高度表达,而SPX2在大脑中高度表达.
- 在体外,SPX1和SPX2对原发性肝细胞的糖解路径表现出相反的影响.
- 在体内,SPX1和SPX2都降低了血清葡萄糖,并增加了肝胰腺糖原,促进了糖解和糖原合成基因表达.
- 这两种都通过上调pfkla增强了胰岛素敏感性,并强化了胰岛素对葡萄糖-6-酸酶 (g6pase),酸碳酸酶 (pepck) 和糖原酸酶L (pygl) 表达的抑制作用.
结论:
- 在草鱼中,SPX1和SPX2在调节葡萄糖代谢方面发挥着重要作用.
- 这两种spexin都通过间接机制增强胰岛素活性,改善葡萄糖平衡.
- SPX1和SPX2对葡萄糖代谢途径产生明显的,相反的直接影响,突出显示了复杂的调节相互作用.
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