期刊
NANO LETTERS
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c02232
关键词
nitrogen-vacancy centers; cell traction force; rotational motions; polarization; nanodiamonds
类别
资金
- HKSAR Research Grants Council (RGC) Early Career Scheme [27202919]
- HKSAR RGC Research Matching Grant Scheme [207300313]
- HKSAR Innovation and Technology Fund (ITF) through the Platform Projects of the Innovation and Technology Support Program (ITSP) [ITS/293/19FP]
- HKU Seed Fund [202011159019, 202010160007]
- Guangdong Special Support Project [2019BT02 x 030]
- RGC General Research Fund [17257016, 17210618, 17210520]
- Health@InnoHK program of the Innovation and Technology Commission of the Hong Kong SAR Government
- National Natural Science Foundation of China [11872325]
- Shenzhen Fundamental Research Fund [JCYJ20210324120213037]
- HKSAR RGC Areas of Excellence (AoE) [AoE/P-701/20]
This study proposes a linear polarization modulation (LPM) method using single nitrogen-vacancy (NV) centers in nanodiamonds (NDs) as fluorescent markers to monitor the rotational and translational motions of the substrate caused by cell traction forces. By achieving precise orientation measurement and localization with background suppression, the experimental results agree well with theoretical calculations, demonstrating the practicability of the NV-based LPM method in studying mechanobiology and cell-material interactions.
Measuring the mechanical interplay between cells and their surrounding microenvironment is vital in cell biology and disease diagnosis. Most current methods can only capture the translational motion of fiduciary markers in the deformed matrix, but their rotational motions are normally ignored. Here, by utilizing single nitrogen-vacancy (NV) centers in nanodiamonds (NDs) as fluorescent markers, we propose a linear polarization modulation (LPM) method to monitor in-plane rotational and translational motions of the substrate caused by cell traction forces. Specifically, precise orientation measurement and localization with background suppression were achieved via optical polarization selective excitation of single NV centers with precisions of similar to 0.5/7.5 s and 2 nm/min, respectively. Additionally, we successfully applied this method to monitor the multidimensional movements of NDs attached to the vicinity of cell focal adhesions. The experimental results agreed well with our theoretical calculations, demonstrating the practicability of the NV-based LPM method in studying mechanobiology and cell-material interactions.
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