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Related Experiment Video

Updated: Mar 8, 2026

Live Cell Imaging during Mechanical Stretch
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Biochemical analysis of force-sensitive responses using a large-scale cell stretch device.

Derrick J Renner1, Makena L Ewald1, Timothy Kim1

  • 1a Biomedical Engineering Department , University of California , Davis, Davis , CA , USA.

Cell Adhesion & Migration
|January 28, 2017
PubMed
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This study introduces a new device for analyzing how cells respond to physical force. The device enables biochemical analysis of force-sensitive responses by applying prolonged cyclic stretch to cells. Using proximity labeling and phospho-specific antibodies, the researchers found that myosin IIA proximity to α-catenin increased with stretch. Akt and GSK3β phosphorylation decreased, suggesting the Akt-GSK3β pathway is sensitive to force. The device has potential for uncovering molecules involved in mechano-transduction.

Area of Science:

  • Cellular mechanobiology
  • Biochemical signaling pathways
  • Tissue engineering

Background:

Prior research has shown that physical force influences tissue homeostasis and disease progression, yet the molecular mechanisms remain unclear. Established knowledge includes the role of force in embryogenesis and regeneration, but gaps persist in understanding protein interactions under stress. No prior work had resolved how biochemical responses differ under force-bearing conditions. This gap motivated the development of new methods to isolate and analyze cell lysates under mechanical stress. Current limitations include the difficulty of obtaining sufficient material for biochemical studies. The absence of scalable tools hampers progress in mechanotransduction research. This paper's contribution lies in addressing these limitations through a novel device. The study aims to bridge the gap between physical force and biochemical outcomes.

Purpose Of The Study:

The aim of this work is to develop a device that enables biochemical analysis of force-sensitive cell responses. The specific problem involves the lack of tools to isolate large quantities of lysates under mechanical stress. This device is designed to overcome limitations in current methods for studying mechano-transduction. The motivation stems from the need to understand protein interactions under force-bearing conditions. The study focuses on detecting changes in protein proximity and phosphorylation. The device allows for prolonged cyclic stretch of cells for biochemical analysis. This approach is intended to reveal force-sensitive signaling pathways. The results may clarify how physical force influences cellular signaling.

Keywords:
AktGSK3βbiotin identification (BioID)force-dependent protein interactionsmechanotransductionsubstrate stretchα-cateninmechanobiologycell signalingmechanical stressbiochemical analysis

Frequently Asked Questions

Biotinylation of myosin IIA increased, and Akt and GSK3β phosphorylation decreased with stretch.

Promiscuous biotin ligase BirA* tagged α-catenin was used to detect myosin IIA proximity.

To simulate force-bearing conditions and observe biochemical responses over time.

They were used to measure phosphorylation changes in Akt, Src, and GSK3β.

The Akt-GSK3β pathway showed reduced phosphorylation under stretch.

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Main Methods:

The study utilized a large-scale cell stretch device fabricated for biochemical analysis. Cells were exposed to prolonged cyclic substrate stretch to simulate force-bearing conditions. Proximal biotinylation (BioID) analysis was used to detect protein proximity changes. Promiscuous biotin ligase BirA* was tagged to α-catenin for proximity labeling. Phospho-specific antibodies were employed to assess phosphorylation changes. The device enabled isolation of cell lysates under controlled mechanical stress. Biotinylation of myosin IIA was quantified to assess proximity to α-catenin. Phosphorylation levels of Akt, Src, and GSK3β were measured to identify force-sensitive pathways.

Main Results:

Biotinylation of myosin IIA increased with cyclic stretch, indicating proximity to α-catenin. Akt phosphorylation was reduced under stretch, while Src phosphorylation remained unchanged. GSK3β phosphorylation was also reduced with stretch, suggesting Akt pathway involvement. Other Akt effectors showed no significant change in phosphorylation. These findings suggest the Akt-GSK3β pathway is sensitive to mechanical force. The device successfully enabled biochemical analysis under force-bearing conditions. The results provide evidence of force-sensitive protein interactions and signaling. The study supports the use of this device for further mechano-transduction research.

Conclusions:

The study demonstrates that the Akt-GSK3β pathway is force-sensitive based on phosphorylation changes. The device enables biochemical analysis of force-sensitive responses in cells. The findings suggest that proximity labeling and phospho-specific antibodies are effective tools. The results support the hypothesis that physical force alters specific signaling pathways. The device has potential for uncovering molecules involved in mechano-transduction. The study does not claim that force is the only regulator of these pathways. The conclusions are limited to the biochemical changes observed in this setup. The device may facilitate future studies on mechano-transduction mechanisms.

The device may uncover molecules involved in mechano-transduction processes.