Cellular responses to patterned poly(acrylic acid) brushes.

Cellular responses to patterned poly(acrylic acid) brushes.
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DOI:
10.1021/la200093e
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发表时间:
2011-06-07
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Baird BA
Baird BA
中科院分区:
其他
文献类型:
--
作者:
Chiang EN;Dong R;Ober CK;Baird BA

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我们使用图案化的聚丙烯酸(PAA)聚合物刷子来探索表面化学和表面形貌对细胞-表面相互作用的影响。过去关于表面形貌对细胞黏附影响的研究大多集中在大于细胞尺寸的图案化特征尺寸上,而PAA刷子被表征为细胞排斥。在这里,我们报告了在PAA刷子表面孵育的RBL肥大细胞的细胞黏附研究,该刷子表面具有各种不同的特征尺寸。我们发现,当在硅表面上形成亚细胞尺寸的图案时,30或15纳米厚的PAA刷子有助于细胞粘连。这似乎是由纤维连接蛋白介导的,纤维连接蛋白由细胞分泌,吸附到刷子上,然后与细胞表面整合素结合。其结果是在刷子内可检测到质膜的堆积,这涉及细胞-表面界面的细胞骨架重塑。通过降低刷子厚度,我们发现PAA可以通过下调膜堆积来促进细胞黏附。我们举例说明了图案化的PAA刷子阵列用于空间控制细胞的激活,方法是用与肥大细胞上的高亲和力受体特异性结合的IgE配体来修饰刷子。
We use patterned poly(acrylic acid) (PAA) polymer brushes to explore the effects of surface chemistry and topography on cell-surface interactions. Most past studies of surface topography effects on cell adhesion have focused on patterned feature sizes that are larger than the dimensions of a cell, and PAA brushes have been characterized as cell repellent. Here we report cell adhesion studies for RBL mast cells incubated on PAA brush surfaces patterned with a variety of different feature sizes. We find that when patterned at sub-cellular dimensions on silicon surfaces, PAA brushes that are 30 or 15 nm thick facilitate cell adhesion. This appears to be mediated by fibronectin, which is secreted by the cells, adsorbing to the brushes and then engaging cell surface integrins. The result is detectable accumulation of plasma membrane within the brushes, and this involves cytoskeletal remodeling at the cell-surface interface. By decreasing brush thickness, we find that PAA can be ‘tuned’ to promote cell adhesion with down-modulated membrane accumulation. We exemplify the utility of patterned PAA brush arrays for spatially controlling the activation of cells by modifying brushes with ligands that specifically engage IgE bound to high affinity receptors on mast cells.
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影响因子: --
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影响因子: 11.1
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影响因子: 11.1
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