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Cell-substratum adhesion is suppressed by high pressure.

T Hashiguchi1, T Yamaguchi, S Terada

  • 1Department of Chemistry, Faculty of Science, Fukuoka University, Jonan-ku, Fukuoka, 814-0180, Japan.

The Japanese Journal of Physiology
|April 29, 1999
PubMed
Summary

This study examined how high pressure affects cell adhesion in Chinese hamster ovary cells. Cells were detached using either EDTA or trypsin and then exposed to pressures up to 80 MPa. At atmospheric pressure, most cells adhered after 4 hours. High pressure up to 40 MPa had little effect on EDTA-treated cells, but at 80 MPa, adhesion was significantly reduced despite integrin expression. Trypsin-treated cells showed even greater suppression at 80 MPa, where integrins were digested. Actin stress fibers disappeared under high pressure, leading to cell rounding and partial detachment. The results suggest that high pressure disrupts adhesion through different mechanisms depending on detachment method. In EDTA-treated cells, pressure may interfere with integrin-ligand interactions. In trypsin-treated cells, pressure may delay integrin membrane expression. These findings highlight the complex effects of pressure on cell adhesion and cytoskeletal structures.

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Area of Science:

  • Cell adhesion mechanisms in cell biology
  • High-pressure effects in biophysics
  • Integrin signaling in membrane biology

Background:

Cell adhesion is a fundamental process in tissue development and function. Prior research has shown that adhesion involves integrins and cytoskeletal structures like actin stress fibers. However, the impact of high pressure on these interactions remains unclear. No prior work had resolved how pressure affects integrin expression or adhesion recovery after detachment. This gap motivated a closer look at how pressure influences adhesion dynamics. Understanding these mechanisms could clarify how cells respond to mechanical stress. The role of integrins in adhesion is well established, but their behavior under pressure is less understood. Researchers have not yet determined if pressure disrupts integrin interactions or delays their membrane localization. This uncertainty drives the need to examine high-pressure effects on cell adhesion.

Purpose Of The Study:

This study aimed to investigate how high pressure affects cell adhesion in Chinese hamster ovary cells. The specific problem was to determine if pressure alters adhesion recovery after detachment by EDTA or trypsin. The motivation came from the lack of knowledge about pressure's role in integrin function and adhesion. Researchers wanted to distinguish between effects on integrin expression and integrin-ligand interactions. The goal was to test if pressure suppresses adhesion through different mechanisms depending on detachment method. The study sought to clarify whether pressure impacts integrin availability or their functional interactions. The focus was on how pressure influences cytoskeletal structures like actin stress fibers. The hypothesis was that pressure may affect adhesion through integrin dynamics and cytoskeletal changes.

Keywords:
cell adhesionhigh pressureintegrin expressionactin stress fibers

Frequently Asked Questions

The authors propose that high pressure disrupts interactions between integrins and their associated proteins in EDTA-detached cells.

Trypsin digestion removes integrins, while EDTA detaches cells without digesting integrins.

Cycloheximide was used to assess the role of protein synthesis in adhesion recovery.

Actin stress fibers disappeared under high pressure, leading to cell rounding and partial detachment.

Adhesion suppression became significant at 80 MPa, not lower pressures like 40 MPa.

Related Experiment Videos

Main Methods:

The study used Chinese hamster ovary cells and tested adhesion under pressures from 0.1 to 80 MPa. Cells were detached using either EDTA or trypsin and then cultured at atmospheric pressure. Adhesion rates were measured after 4 hours of recovery. Cycloheximide was added to assess protein synthesis's role in adhesion. High-pressure treatments were applied to EDTA-detached cells before returning them to atmospheric conditions. Integrin expression was analyzed on plasma membranes after pressure exposure. Actin stress fibers were observed in spread cells after pressure exposure. The study compared adhesion recovery between EDTA and trypsin-treated cells under pressure.

Main Results:

At atmospheric pressure, about 85% of cells adhered after detachment. Cycloheximide inhibited adhesion in trypsin-treated cells but had less effect on EDTA-treated cells. At high pressures up to 40 MPa, adhesion remained unaffected in EDTA-treated cells. At 80 MPa, adhesion was significantly suppressed in EDTA-treated cells despite integrin expression. Trypsin-treated cells showed marked suppression at 80 MPa, where integrins were digested. Actin stress fibers disappeared in cells exposed to 80 MPa, leading to cell rounding. Rounded cells were partially detached from the substratum after high-pressure exposure. These findings suggest pressure affects adhesion through integrin interactions and delayed membrane expression.

Conclusions:

The authors propose that high pressure suppresses adhesion in EDTA-detached cells by disrupting integrin-ligand interactions. They suggest that pressure may also delay integrin membrane expression in trypsin-treated cells. The study indicates that pressure affects adhesion through different mechanisms depending on detachment method. The findings suggest that integrin availability and function are pressure-sensitive. The results imply that cytoskeletal structures like actin stress fibers are vulnerable to pressure. The authors propose that pressure-induced rounding correlates with reduced adhesion. The study suggests that pressure may interfere with integrin-associated protein interactions. These conclusions are based on observed adhesion rates and cytoskeletal changes under pressure.

The authors suggest that pressure may delay integrin membrane expression and disrupt integrin-ligand interactions.