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Phenyl Saligenin Phosphate Disrupts Cell Morphology and the Actin Cytoskeleton in Differentiating H9c2 Cardiomyoblasts and Human-Induced Pluripotent Stem-Cell-Derived Cardiomyocyte Progenitor Cells.
Chemical Research in Toxicology ( IF 3.7 ) Pub Date : 2020-08-06 , DOI: 10.1021/acs.chemrestox.0c00100
Shatha G Felemban 1 , Falguni S Vyas 1 , Lyndsey Durose 1 , Alan J Hargreaves 1 , John M Dickenson 1
Affiliation  

We have previously shown that phenyl saligenin phosphate (PSP), an organophosphorus compound which is classed as a weak inhibitor of acetylcholinesterase, triggered cytotoxicity in mitotic and differentiated H9c2 cardiomyoblasts. The aim of this study was to assess whether sublethal concentrations of PSP could disrupt the morphology of differentiating rat H9c2 cardiomyoblasts and human-induced pluripotent stem-cell-derived cardiomyocyte progenitor cells (hiPSC-CMs) and to assess the underlying cytoskeletal changes. PSP-induced changes in protein expression were monitored via Western blotting, immunocytochemistry, and proteomic analysis. PSP-mediated cytotoxicity was determined by measuring MTT reduction, LDH release, and caspase-3 activity. Sublethal exposure to PSP (3 μM) induced morphological changes in differentiating H9c2 cells (7, 9, and 13 days), reflected by reduced numbers of spindle-shaped cells. Moreover, this treatment (7 days) attenuated the expression of the cytoskeletal proteins cardiac troponin I, tropomyosin-1, and α-actin. Further proteomic analysis identified nine proteins (e.g., heat shock protein 90-β and calumenin) which were down-regulated by PSP exposure in H9c2 cells. To assess the cytotoxic effects of organophosphorus compounds in a human cell model, we determined their effects on human-induced pluripotent stem-cell-derived cardiomyocyte progenitor cells. Chlorpyrifos and diazinon-induced cytotoxicity (48 h) was evident only at concentrations >100 μM. By contrast, PSP exhibited cytotoxicity in hiPSC-CMs at a concentration of 25 μM following 48 h exposure. Finally, sublethal exposure to PSP (3 μM; 7 days) induced morphological changes and decreased the expression of cardiac troponin I, tropomyosin-1, and α-actin in hiPSC-CMs. In summary, our data suggest cardiomyocyte morphology is disrupted in both cell models by sublethal concentrations of PSP via modulation of cytoskeletal protein expression.

中文翻译:

Phenyl Saligenin Phosphate 在分化 H9c2 心肌细胞和人诱导的多能干细胞衍生的心肌祖细胞时破坏细胞形态和肌动蛋白细胞骨架。

我们之前已经表明,苯基水杨苷磷酸 (PSP),一种被归类为乙酰胆碱酯酶弱抑制剂的有机磷化合物,在有丝分裂和分化的 H9c2 心肌细胞中引发细胞毒性。本研究的目的是评估亚致死浓度的 PSP 是否会破坏分化大鼠 H9c2 心肌细胞和人诱导多能干细胞衍生的心肌祖细胞 (hiPSC-CM) 的形态,并评估潜在的细胞骨架变化。通过蛋白质印迹、免疫细胞化学和蛋白质组学分析监测 PSP 诱导的蛋白质表达变化。PSP 介导的细胞毒性通过测量 MTT 减少、LDH 释放和 caspase-3 活性来确定。亚致死暴露于 PSP (3 μM) 诱导分化 H9c2 细胞的形态学变化 (7, 9, 和 13 天),反映为梭形细胞数量减少。此外,这种治疗(7 天)减弱了细胞骨架蛋白心肌肌钙蛋白 I、原肌球蛋白-1 和 α-肌动蛋白的表达。进一步的蛋白质组学分析确定了九种蛋白质(例如,热休克蛋白 90-β 和钙调蛋白),它们在 H9c2 细胞中被 PSP 暴露下调。为了评估有机磷化合物在人类细胞模型中的细胞毒性作用,我们确定了它们对人类诱导的多能干细胞衍生的心肌祖细胞的影响。毒死蜱和二嗪农诱导的细胞毒性(48 小时)仅在浓度 >100 μM 时才明显。相比之下,PSP 在 hiPSC-CM 中以 25 μM 的浓度暴露 48 小时后表现出细胞毒性。最后,亚致死暴露于 PSP(3 μM;7 天)诱导形态学变化并降低 hiPSC-CM 中心肌肌钙蛋白 I、原肌球蛋白-1 和 α-肌动蛋白的表达。总之,我们的数据表明,通过调节细胞骨架蛋白表达,亚致死浓度的 PSP 会破坏两种细胞模型中的心肌细胞形态。
更新日期:2020-09-21
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