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Related Concept Videos

Cell-matrix's Response to Mechanical Forces01:13

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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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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.
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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
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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.
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Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
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Related Experiment Video

Updated: Aug 29, 2025

Studying the Effects of Matrix Stiffness on Cellular Function using Acrylamide-based Hydrogels
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Studying the Effects of Matrix Stiffness on Cellular Function using Acrylamide-based Hydrogels

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How do cells stiffen?

Peter A Galie1, Penelope C Georges2, Paul A Janmey3

  • 1Department of Biomedical Engineering, Rowan University, 201 Mullica Hill Rd, Glassboro, NJ 08028, U.S.A.

The Biochemical Journal
|September 12, 2022
PubMed
Summary
This summary is machine-generated.

Cell stiffness, a key cell characteristic, is influenced by various stimuli and signaling pathways. Understanding these mechanisms is crucial for diagnosing and treating diseases where cell stiffness changes.

Keywords:
cell mechanicscytoskeletonmechanobiology

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Area of Science:

  • Biophysics
  • Cell Biology
  • Biochemistry

Background:

  • Cell stiffness is a critical cellular property influencing cell function and behavior.
  • Alterations in cell stiffness are observed in various pathological conditions.
  • The cell membrane and cytoskeleton are primary determinants of cell stiffness.

Purpose of the Study:

  • To review methods for measuring cell stiffness.
  • To summarize stimuli that modify cell stiffness.
  • To discuss signaling pathways controlling cell stiffness.

Main Methods:

  • Survey of existing literature on cell stiffness measurement techniques.
  • Analysis of studies on biophysical and biochemical stimuli affecting cell stiffness.
  • Examination of signaling pathways impacting cytoskeletal dynamics.

Main Results:

  • Identified various methods to quantify cell stiffness.
  • Detailed stimuli (biophysical and biochemical) that alter cell stiffness.
  • Elucidated signaling pathways influencing cytoskeletal components and gene expression.

Conclusions:

  • Cell stiffness is a dynamic property regulated by complex signaling networks.
  • Changes in cell stiffness have implications for cellular homeostasis and disease pathology.
  • Mechanisms controlling cell stiffness present potential therapeutic targets.