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Related Concept Videos

Cell-matrix's Response to Mechanical Forces01:13

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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In eukaryotic cells,  cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled  that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc  with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one substance to...
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Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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Related Experiment Video

Updated: Feb 3, 2026

Quantitative Approaches for Studying Cellular Structures and Organelle Morphology in Caenorhabditis elegans
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Mechanical forces on cellular organelles.

Qian Feng1, Benoît Kornmann1

  • 1Institute of Biochemistry, ETH Zurich, 8093 Zürich, Switzerland qian.feng@bc.biol.ethz.ch Benoit.Kornmann@bc.biol.ethz.ch.

Journal of Cell Science
|October 31, 2018
PubMed
Summary
This summary is machine-generated.

Cellular organelles face mechanical challenges in confined spaces. This study explores how the nucleus and mitochondria adapt to these physical stresses, proposing ER-mitochondrial contacts induce mitochondrial fission.

Keywords:
ActinDynamin-related protein 1ER–mitochondria contact sitesMechanobiologyMembraneMitochondriaMitochondrial fission factorNucleusOrganelleOrganelle fission

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Area of Science:

  • Cell Biology
  • Biophysics
  • Mechanobiology

Background:

  • Eukaryotic cells possess a complex, compact intracellular environment with dynamic organelles.
  • Organelle interactions involve physical navigation in confined spaces, not just molecular exchange.
  • While biochemical interactions are well-studied, the mechanical properties and physical interactions of organelles are emerging areas of research.

Purpose of the Study:

  • To highlight intracellular mechanical challenges in biological systems.
  • To focus on the mechanical coping mechanisms of the nucleus and mitochondria.
  • To propose a hypothesis regarding ER-mitochondrial contact sites and mitochondrial fission.

Main Methods:

  • Review of existing literature on intracellular mechanical challenges.
  • Analysis of mechanical strain on organelles in experimental systems and in vivo.
  • Focus on nucleus and mitochondria as model organelles.

Main Results:

  • Intracellular organelles experience significant mechanical strain.
  • The nucleus and mitochondria exhibit specific mechanical coping strategies.
  • ER-mitochondrial contact sites may mechanically constrict mitochondrial tubules, inducing fission.

Conclusions:

  • Organelle mechanics and physical interactions are crucial for cellular function.
  • The nucleus and mitochondria demonstrate remarkable mechano-responsiveness.
  • Further research into organelle mechano-responsiveness and its implications is warranted.