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Related Concept Videos

Integrins01:10

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,...
Intracellular Signaling Affects Focal Adhesions01:17

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...
Anchoring Junctions01:03

Anchoring Junctions

Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
Desmosomes01:05

Desmosomes

The term desmosome derives from the Greek words "desmo" and "soma" meaning "adhesion bodies." This structure was first observed during the late 1800s and described as small, dense nodules in the epidermis. Desmosomes are button-like structures that help form an interlinked network of intermediate filaments across the cells. These junctions are  essential to hold cells together under mechanical stress and to maintain tissue integrity. Desmosomes are multi-protein complexes comprising desmosomal...
Tension Response at Adherens Junctions01:26

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...
The Sarcomere01:08

The Sarcomere

A sarcomere is a microscopic segment repeating in a myofibril. The sarcomere fundamentally consists of two main myofilaments: thick filaments called myosin and thin filaments called actin. These filaments interact by sliding past each other in response to stimulus. In addition to myosin and actin, several other proteins, such as tropomyosin, troponin, titin, nebulin, myomesin, α-actinin, and dystrophin, play crucial roles in regulating, structuring, and functioning of the sarcomere.
Each myosin...

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Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads
07:55

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

Published on: March 8, 2017

Integrin-mediated adhesion maintains sarcomeric integrity.

Alexander D Perkins1, Stephanie J Ellis, Parisa Asghari

  • 1Department of Cellular and Physiological Sciences, University of British Columbia, Life Science Institute, 2350 Health Sciences Mall, Vancouver, BC, Canada V6T 1Z3.

Developmental Biology
|November 3, 2009
PubMed
Summary
This summary is machine-generated.

Integrin adhesion is crucial for maintaining muscle structure and function. Disrupting this adhesion in adult muscles causes progressive muscle weakness and disintegration of sarcomeres, highlighting its role in muscle maintenance.

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Imaging Integrin Tension and Cellular Force at Submicron Resolution with an Integrative Tension Sensor

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Related Experiment Videos

Last Updated: Jun 19, 2026

Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads
07:55

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

Published on: March 8, 2017

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
09:14

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Published on: June 13, 2014

Imaging Integrin Tension and Cellular Force at Submicron Resolution with an Integrative Tension Sensor
07:20

Imaging Integrin Tension and Cellular Force at Submicron Resolution with an Integrative Tension Sensor

Published on: April 25, 2019

Area of Science:

  • Muscle biology
  • Cell adhesion
  • Developmental biology

Background:

  • Integrin-mediated adhesion to the extracellular matrix (ECM) is vital for animal tissue development.
  • In skeletal muscles, integrins ensure structural stability for force generation.
  • Disruptions in integrin adhesion cause myopathies in humans and mice.

Purpose of the Study:

  • To investigate whether defects in integrin-mediated adhesion cause muscle formation or maintenance issues.
  • To analyze the impact of disrupting integrin-mediated adhesion in adult muscle tissue.

Main Methods:

  • Utilized an inducible, targeted RNA interference (RNAi) approach.
  • Disrupted integrin-mediated adhesion in fully formed adult fly muscles.
  • Performed electron microscopic analysis to examine sarcomeric cytoarchitecture.

Main Results:

  • Reduced integrin-mediated adhesion led to progressive muscle function loss.
  • Observed failure to maintain normal sarcomeric cytoarchitecture.
  • Identified age-dependent disorganization of sarcomeric actin, Z-line, and M-line.
  • Electron microscopy revealed actin detachment from Z-lines, Z-line/membrane separation, and Z-line disintegration.

Conclusions:

  • Integrin-mediated adhesion is essential for maintaining sarcomeric integrity in adult muscles.
  • Adhesive contacts underlying sarcomeric architecture are dynamic and require continuous maintenance.
  • This study demonstrates the critical role of integrins in muscle maintenance, not just formation.