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Surplus spermine does not protect salmon cells against lipopolysaccharide (LPS)‐induced stress, but excess spermine is eliminated through spermidine/spermine N1‐acetyltransferase (SSAT)
Aquaculture Nutrition ( IF 3.0 ) Pub Date : 2020-02-18 , DOI: 10.1111/anu.13052
Marit Espe 1 , Shiwei Xie 1 , Shijun Chen 1 , Anders Aksnes 2 , Elisabeth Holen 1
Affiliation  

The present trials tested the efficiency of surplus spermine to reduce inflammation and oxidative stress following LPS‐induced stress using an in vitro model of head kidney and liver cells isolated from Atlantic salmon. Spermine did not protect cells from LPS‐induced inflammatory response at either 0.3, 0.6 or 0.9 mM. However, as the gene expression of spermidine/spermine N1‐acetyltransferase (SSAT) increased with increasing spermine concentration, we addressed possible oxidative effects of the increased SSAT using its activator DENSPM or inhibitor of polyamine oxidation of the acetylated polyamines using MDL72527 at a spermine concentration of 0.6 mM. There was no significant effect of DENSPM, but MDL72527 decreased gene expression of GPX‐3 (p = .04), while gene expression of catalase and MnSOD was unaffected by treatment (p = .30 and p = .48, respectively). In conclusion, spermine did not protect cells from LPS‐provoked inflammation. The higher the spermine concentration, the more SSAT producing acetylated spermine occurred. Inhibiting the acetylated polyamine oxidases by MDL72527 improved oxidation status as expected due to a lower endogenous production of H₂O₂ by polyamine and acetylated polyamine oxidases. Probably care should be taken using polyamines or arginine as functional ingredients to avoid any increased oxidation within cells.

中文翻译:

多余的精胺不能保护鲑鱼细胞免受脂多糖 (LPS) 诱导的压力,但过量的精胺会通过亚精胺/精胺 N1-乙酰转移酶 (SSAT) 消除

目前的试验使用从大西洋鲑鱼中分离的头部肾细胞和肝细胞的体外模型测试了过剩精胺在 LPS 诱导的应激后减少炎症和氧化应激的效率。精胺在 0.3、0.6 或 0.9 mM 时均不能保护细胞免受 LPS 诱导的炎症反应。然而,由于亚精胺/精胺 N1-乙酰转移酶 (SSAT) 的基因表达随着精胺浓度的增加而增加,我们使用其活化剂 DENSPM 或使用 MDL72527 在精胺浓度下抑制乙酰化多胺的多胺氧化来解决增加的 SSAT 可能的氧化作用0.6 毫米。DENSPM 没有显着影响,但 MDL72527 降低了 GPX-3 的基因表达(p = .04),而过氧化氢酶和 MnSOD 的基因表达不受治疗影响(p = .30 和 p = .48,分别)。总之,精胺不能保护细胞免受 LPS 引起的炎症。精胺浓度越高,产生的 SSAT 乙酰化精胺就越多。由于多胺和乙酰化多胺氧化酶产生的 H2O2 内源性较低,因此 MDL72527 抑制乙酰化多胺氧化酶改善了氧化状态。可能应该小心使用多胺或精氨酸作为功能成分,以避免细胞内的氧化增加。由于多胺和乙酰化多胺氧化酶产生的 H2O2 内源性较低,因此 MDL72527 抑制乙酰化多胺氧化酶改善了氧化状态。可能应该小心使用多胺或精氨酸作为功能成分,以避免细胞内的氧化增加。由于多胺和乙酰化多胺氧化酶产生的 H2O2 内源性较低,因此 MDL72527 抑制乙酰化多胺氧化酶改善了氧化状态。可能应该小心使用多胺或精氨酸作为功能成分,以避免细胞内任何增加的氧化。
更新日期:2020-02-18
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