DNA-based digital tension probes reveal integrin forces during early cell adhesion.

DNA-based digital tension probes reveal integrin forces during early cell adhesion.
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DOI:
10.1038/ncomms6167
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发表时间:
2014-10-24
影响因子:
16.6
通讯作者:
Salaita, Khalid
Salaita, Khalid
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhang, Yun;Ge, Chenghao;Zhu, Cheng;Salaita, Khalid

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Mechanical stimuli profoundly alter cell fate, yet the mechanisms underlying mechanotransduction remain obscure due to a lack of methods for molecular force imaging. Here, to address this need, we develop a new class of molecular tension probes that function as a switch to generate a 20–30-fold increase in fluorescence upon experiencing a threshold piconewton force. The probes employ immobilized DNA-hairpins with tunable force response thresholds, ligands, and fluorescence reporters. Quantitative imaging reveals that integrin tension is highly dynamic and increases with an increasing integrin density during adhesion formation. Mixtures of fluorophore-encoded probes show integrin mechanical preference for cyclized-RGD over linear-RGD peptides. Multiplexed probes with variable guanine-cytosine content within their hairpins reveal integrin preference for the more stable probes at the leading tip of growing adhesions near the cell edge. DNA-based tension probes are among the most sensitive optical force reporters to date, overcoming the force and spatial-resolution limitations of traction force microscopy.
在生活/非生存界面处的张力传感纳米颗粒用于机械成像。
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