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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...

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Cell-matrix's Response to Mechanical Forces

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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Anchoring Junctions

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:...

Adherens Junctions

Adherens Junctions

Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types – adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
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Overview of Cell-Matrix Interactions

The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...

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Perturbing Endothelial Biomechanics via Connexin 43 Structural Disruption

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Lessons from the endothelial junctional mechanosensory complex.

Daniel Conway, Martin A Schwartz

F1000 Biology Reports

|January 13, 2012

Summary

Mechanotransduction, the process by which cells sense mechanical forces, is crucial in vascular health and disease. A protein complex at cell junctions mediates responses to blood flow, influencing vessel function.

Area of Science:

Biomedical Engineering
Cell Biology
Physiology

Background:

Mechanotransduction is vital for physiological processes and diseases like cancer and hypertension.
The vascular system is a prime example where fluid shear stress impacts blood vessel structure and function.
Endothelial cell-cell junctions contain a protein complex involving PECAM-1, VE-cadherin, and VEGFR2 that responds to mechanical stimuli.

Purpose of the Study:

To review recent advancements in understanding mechanotransduction.
To elucidate the functions and mechanisms of the PECAM-1, VE-cadherin, and VEGFR2 protein complex.
To explore broader principles of mechanotransduction in the vascular system.

Main Methods:

Literature review of recent research on mechanotransduction.

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Analysis of the roles of PECAM-1, VE-cadherin, and VEGFR2 in cellular responses to mechanical stress.

Synthesis of findings to propose generalizable principles.

Main Results:

The protein complex at endothelial cell junctions is a key mediator of responses to fluid shear stress.
These mechanosensing proteins have diverse, non-mechanical functions alongside their roles in mechanotransduction.
Progress has been made in understanding how this complex translates mechanical cues into cellular signals.

Conclusions:

The PECAM-1, VE-cadherin, and VEGFR2 complex is central to vascular mechanotransduction.
Understanding this complex offers insights into vascular diseases.
Principles derived from this complex may inform broader mechanobiology research.