Fixation-induced cell blebbing on spread cells inversely correlates with phosphatidylinositol 4,5-bisphosphate level in the plasma membrane.

Fixation-induced cell blebbing on spread cells inversely correlates with phosphatidylinositol 4,5-bisphosphate level in the plasma membrane.
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固定诱导的扩散细胞上的细胞起泡与质膜中磷脂酰肌醇 4,5-二磷酸水平呈负相关。

DOI:
10.1016/j.fob.2014.02.003
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发表时间:
2014
期刊:
影响因子:
2.6
通讯作者:
Chen Y
Chen Y
中科院分区:
生物学4区
文献类型:
--
作者:
Zhao S;Liao H;Ao M;Wu L;Zhang X;Chen Y

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蛋白质固定剂(而非脂质稳定剂)会诱导铺展细胞发生细胞起泡现象。 固定诱导产生的泡的不对称分布与磷脂酰肌醇 - 4,5 - 二磷酸(PIP2)的分布一致。 在PIP2水平升高的铺展细胞上,固定处理较不容易诱导起泡。 在PIP2水平较低的铺展细胞上,固定处理更容易诱导起泡。 破坏脂筏会增强铺展细胞因固定而产生的起泡现象。 尽管大多数研究关注的是生理过程产生的泡,但对于固定诱导细胞起泡的分子机制研究较少。我们发现,蛋白质固定剂(如醛类和苦味酸),而非脂质稳定剂(如四氧化锇和高锰酸钾),会诱导铺展细胞起泡。我们还发现,醛类固定剂可能会导致质膜中磷脂酰肌醇 - 4,5 - 二磷酸(PIP2)的丢失或重新分布,并且在铺展/迁移细胞上,固定诱导产生的泡的不对称分布与经脂质稳定剂(如四氧化锇)预固定的细胞上PIP2的分布一致。此外,在PIP2水平升高的铺展细胞上,固定处理较难诱导起泡,而在PIP2水平降低或脂筏被破坏的铺展细胞上则更容易诱导起泡。我们的数据表明,固定诱导细胞骨架附着膜位点处PIP2水平降低,通过膜 - 细胞骨架连接的局部破坏导致泡的形成。
Protein- but not lipid-stabilizing fixatives induce cell blebbing of spread cells. Asymmetric distribution of fixation-induced blebs coincides with that of PIP2. Fixation less readily induces blebbing on spread cells with elevated PIP2 levels. Fixation more readily induces blebbing on spread cells with lower PIP2 levels. Disruption of lipid rafts enhances fixation-induced blebbing of spread cells. While most attention has been focused on physiologically generated blebs, the molecular mechanisms for fixation-induced cell blebbing are less investigated. We show that protein-fixing (e.g. aldehydes and picric acid) but not lipid-stabilizing (e.g. OsO4 and KMnO4) fixatives induce blebbing on spread cells. We also show that aldehyde fixation may induce the loss or delocalization of phosphatidylinositol 4,5-bisphosphate (PIP2) in the plasma membrane and that the asymmetric distribution of fixation-induced blebs on spread/migrating cells coincides with that of PIP2 on the cells prefixed by lipid-stabilizing fixatives (e.g., OsO4). Moreover, fixation induces blebbing less readily on PIP2-elevated spread cells but more readily on PIP2-lowered or lipid raft-disrupted spread cells. Our data suggest that fixation-induced lowering of PIP2 level at cytoskeleton-attaching membrane sites causes bleb formation via local breakdown of the membrane–cytoskeleton coupling.
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