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Metabolic Profiling as a Tool for Understanding Defense Response of Taxus Cuspidate Cells to Shear Stress

机译:代谢分析作为了解红豆杉鳞状细胞对剪应力的防御反应的工具

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摘要

To obtain a better understanding of responsive mechanism of plant cells in response to hydrodynamic mechanical stress, a metabolic profiling approach was used to profile metabolite changes of Taxus cuspidata cells under laminar shear stress. A total of 65 intracellular metabolites were identified and quantified, using gas chromatography coupled to iime-of-flight mass spectrometry. Potential biomarkers were found by the principal component analysis as well as partial least squares combined with variable influence in the projection. Trehalose, sorbitol, ascorbate, sucrose, and gluconic acid were mainly responsible for the discrimination between shear stress induced cells and control cells. Further analysis by mapping measured metabolite concentrations onto the metabolic network revealed that shear stress imposed restrictions on primary metabolic pathways by inhibiting tricarboxylic acid cycle, glycolysis, and N metabolism. To adapt to the shear condition, cells responded by starting defensive programs. These defensive programs included coinduction of glycolysis and sucrose metabolism, accumulation of compatible solutes, and antioxidative strategy. A strategy of defense mechanisms at the level of metabolites for T. cuspidata cells when challenged with the shear stress was proposed.
机译:为了更好地了解植物细胞对水动力机械胁迫的响应机制,采用了一种代谢谱分析方法来分析层状切应力下红豆杉细胞代谢产物的变化。使用气相色谱与飞行模拟质谱联用,共鉴定并定量了65种细胞内代谢物。通过主成分分析以及局部最小二乘结合投影中的可变影响,发现了潜在的生物标志物。海藻糖,山梨糖醇,抗坏血酸,蔗糖和葡萄糖酸主要负责区分剪切应力诱导的细胞和对照细胞。通过将测得的代谢物浓度映射到代谢网络上的进一步分析表明,剪切应力通过抑制三羧酸循环,糖酵解和氮代谢而对主要代谢途径施加了限制。为了适应剪切条件,细胞通过启动防御程序做出反应。这些防御程序包括糖酵解和蔗糖代谢的共诱导,相容性溶质的积累和抗氧化策略。提出了一种在剪应力作用下针对虎杖细胞代谢产物水平的防御机制的策略。

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