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Intracellular Signaling Affects Focal Adhesions

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...

Mechanisms of Membrane-bending

Mechanisms of Membrane-bending

The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...

Tension Response at Adherens Junctions

Tension Response at Adherens Junctions

The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...

Activation of Integrins

Activation of Integrins

Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.

Integrins

Integrins

Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...

Cell-matrix's Response to Mechanical Forces

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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue.
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Related Experiment Video

Updated: Jun 20, 2026

Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads

Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads

Published on: March 8, 2017

Membrane deformation at integrin adhesions.

Erdinç Atilgan¹, Ben Ovryn

¹Gruss-Lipper Biophotonics Center, Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.

Current Pharmaceutical Biotechnology

|August 20, 2009

Summary

This study introduces a novel method to measure cell adhesion nucleation using advanced microscopy and simulations. Findings reveal actin filaments drive membrane indentation, initiating adhesions below the diffraction limit.

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Pulling Membrane Nanotubes from Giant Unilamellar Vesicles

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Published on: December 7, 2017

Area of Science:

Cell biology
Biophysics
Optical microscopy

Background:

Cell adhesion is crucial for biological processes.
Understanding the initial formation of cell adhesions is key.
Existing methods have limitations in precise measurement of early adhesion events.

Purpose of the Study:

To develop and apply a novel technique for measuring the nucleation of new cell adhesions.
To investigate the physical mechanisms driving the formation of these adhesions.
To correlate optical measurements with molecular markers of adhesion.

Main Methods:

Combined phase shifting laser feedback interferometry with high numerical aperture inverted fluorescence microscopy.
Utilized stage scanning interference microscopy for nanometer-precision distance measurements.
Employed analytic and Monte Carlo simulations to model adhesion energetics and predict features.

Main Results:

Simulations predicted actin filaments nucleate adhesions by pushing the cell membrane down.
Experimental data from metastatic mammary adenocarcinoma cells showed reflectivity correlated with focal adhesion markers.
Developed a model to obtain surface topography at focal adhesions from optical phase data.

Conclusions:

The developed technique allows precise measurement of cell adhesion nucleation.
Actin filament-driven membrane bending is a key mechanism in initiating new adhesions.
Optical phase data can reveal surface topography at focal adhesions, correlating with molecular markers.