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Related Concept Videos

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...
Mechanical Protein Functions01:58

Mechanical Protein Functions

Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
Cell-matrix's Response to Mechanical Forces01:13

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. 
Anchoring junctions mechanically attach a cell to the...
Mechanisms of Membrane-bending01:15

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...
Directionality of Nuclear Transport01:42

Directionality of Nuclear Transport

Ras-related nuclear protein or Ran is a small G protein that cycles between its GTP and GDP bound states. Ran specific regulators, a Ran GTPase Activating Protein or RanGAP present in the cytosol and a Ran guanine nucleotide exchange factor or RanGEF present inside the nucleus regulate GTP/GDP exchange. A high concentration of GTP inside the cells, in addition to this asymmetric distribution of  Ran-specific regulators, leads to a higher RanGTP concentration inside the nucleus. This...
Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...

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Related Experiment Video

Updated: Jul 4, 2026

Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology
06:54

Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology

Published on: July 5, 2022

Nuclear shape, mechanics, and mechanotransduction.

Kris Noel Dahl1, Alexandre J S Ribeiro, Jan Lammerding

  • 1Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213, USA. krisdahl@cmu.edu

Circulation Research
|June 7, 2008
PubMed
Summary

Mechanical forces impact the nucleus, affecting cell signaling and gene transcription. Changes in nuclear structure, particularly involving lamins, are crucial for cellular responses to force.

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Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology
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Area of Science:

  • Cellular Biology
  • Biophysics
  • Mechanobiology

Background:

  • The nucleus, housing the genome, is central to transcriptional regulation in eukaryotic cells.
  • As the largest and stiffest organelle, the nucleus experiences significant mechanical forces from both internal and external cellular environments.
  • These forces are transmitted via the cytoskeleton, influencing nuclear shape, structure, and function.

Purpose of the Study:

  • To discuss the impact of intra- and extracellular forces on nuclear shape and structure.
  • To explore the role of these force-induced changes in nuclear mechanotransduction, including cell signaling and gene transcription.
  • To examine the mechanical pathways linking the cytoskeleton to the nucleus.

Main Methods:

  • Review of mechanical studies focusing on the nucleus and nuclear structural proteins, such as lamins.
  • Analysis of data from genetically engineered mice, RNA interference studies, and human diseases with lamin mutations or absence.
  • Examination of force-responsive cytoskeletal pathways and their connection to nuclear mechanics.

Main Results:

  • Mutations or absence of lamin proteins lead to significant alterations in nuclear shape, organization, and stiffness.
  • Mechanical forces can induce changes in nuclear structure that are implicated in mechanotransduction processes.
  • Studies link altered nuclear shape to cell function during various developmental, physiological, and pathological conditions.

Conclusions:

  • The nucleus plays a critical role in the cellular response to mechanical forces.
  • Nuclear structural proteins, like lamins, are key determinants of the nucleus's mechanical properties and response.
  • Understanding nuclear mechanotransduction is vital for comprehending cell behavior in health and disease.