Volume 21, Issue 9 2410095
Research Article

Picofluidic Electro-Osmosis Measurement of Cell Membrane Mechanical Properties

Xiao-Yuan Wang

Xiao-Yuan Wang

Key Laboratory for Advanced Materials, Feringa Nobel Prize Scientist Joint Research Center, Joint International Laboratory for Precision Chemistry, Frontiers Science Center for Materiobiology & Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237 P. R. China

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Ze-Rui Zhou

Ze-Rui Zhou

Department of Chemistry, University of Texas at Austin, Austin, TX, 78712 USA

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Li-Juan Gong

Li-Juan Gong

Key Laboratory for Advanced Materials, Feringa Nobel Prize Scientist Joint Research Center, Joint International Laboratory for Precision Chemistry, Frontiers Science Center for Materiobiology & Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237 P. R. China

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Man-Sha Wu

Man-Sha Wu

Key Laboratory for Advanced Materials, Feringa Nobel Prize Scientist Joint Research Center, Joint International Laboratory for Precision Chemistry, Frontiers Science Center for Materiobiology & Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237 P. R. China

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Shi-Yi Zhang

Shi-Yi Zhang

Key Laboratory for Advanced Materials, Feringa Nobel Prize Scientist Joint Research Center, Joint International Laboratory for Precision Chemistry, Frontiers Science Center for Materiobiology & Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237 P. R. China

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Jian Lv

Jian Lv

School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai, 201418 P. R. China

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Bin-Bin Chen

Bin-Bin Chen

Key Laboratory for Advanced Materials, Feringa Nobel Prize Scientist Joint Research Center, Joint International Laboratory for Precision Chemistry, Frontiers Science Center for Materiobiology & Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237 P. R. China

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Da-Wei Li

Da-Wei Li

Key Laboratory for Advanced Materials, Feringa Nobel Prize Scientist Joint Research Center, Joint International Laboratory for Precision Chemistry, Frontiers Science Center for Materiobiology & Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237 P. R. China

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Ruo-Can Qian

Corresponding Author

Ruo-Can Qian

Key Laboratory for Advanced Materials, Feringa Nobel Prize Scientist Joint Research Center, Joint International Laboratory for Precision Chemistry, Frontiers Science Center for Materiobiology & Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237 P. R. China

E-mail: [email protected]

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First published: 03 February 2025

Abstract

Cells connect with their internal and external environments through plasma membranes, and the mechanical properties of cell membranes govern numerous biological events. Membrane detection techniques such as optical or magnetic tweezers have revealed mechanical strength by membrane-anchored modifications, but it remains challenging to develop label-free methods to reduce the influence of exogenous interference. Here picofluidic electro-osmosis measurement (PEOM), which enables direct and efficient sensing of cell membrane mechanical properties by using a glass nanopipette without labeling, is presented. By generating a picoliter electroosmotic fluid at the nanopipette tip, periodic cell membrane vibration modes are observed from current traces, which carry information on membrane mechanical properties to indicate its biological state. Based on characteristic peaks in the frequency domain, a theoretical framework to describe the vibration modes, which contains two ideal spring vibrator models corresponding to stretching and bending vibrations of cell membrane respectively, is developed. Notably, the PEOM strategy represents a label-free approach to reveal the mechanical properties of living cell membranes from two dimensions, which is completely different from other methods. Additionally, the exciting potential of PEOM is demonstrated for label-free observation of membrane mechanical property changes during different bioprocesses, including cytoskeletal alteration, membrane tension change, and mechanical polarization.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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