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Related Concept Videos

Small GTPases - Ras and Rho01:24

Small GTPases - Ras and Rho

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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
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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. 
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Blebbing Through the Matrix
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Optogenetic Inhibition of Rho1-Mediated Actomyosin Contractility Coupled with Measurement of Epithelial Tension in Drosophila Embryos
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From mechanical force to RhoA activation.

Elizabeth C Lessey1, Christophe Guilluy, Keith Burridge

  • 1Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, NC 27599, USA.

Biochemistry
|August 31, 2012
PubMed
Summary
This summary is machine-generated.

Mechanical forces regulate cell behavior by activating the RhoA GTPase pathway, influencing cell structure, contraction, gene expression, and differentiation. This review details how cells sense and respond to mechanical cues.

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Last Updated: May 19, 2026

Optogenetic Inhibition of Rho1-Mediated Actomyosin Contractility Coupled with Measurement of Epithelial Tension in Drosophila Embryos
12:35

Optogenetic Inhibition of Rho1-Mediated Actomyosin Contractility Coupled with Measurement of Epithelial Tension in Drosophila Embryos

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Affinity Precipitation of Active Rho-GEFs Using a GST-tagged Mutant Rho Protein (GST-RhoA(G17A)) from Epithelial Cell Lysates
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Affinity Precipitation of Active Rho-GEFs Using a GST-tagged Mutant Rho Protein (GST-RhoA(G17A)) from Epithelial Cell Lysates

Published on: March 31, 2012

Area of Science:

  • Cell Biology
  • Mechanobiology
  • Molecular Signaling

Background:

  • Cells constantly sense and respond to mechanical forces from internal and external sources.
  • These forces can originate from the environment or the cell's own actin cytoskeleton.
  • Mechanical stimuli activate intracellular signaling pathways crucial for cellular functions.

Purpose of the Study:

  • To review the signaling pathways linking mechanical force to the regulation of the GTPase RhoA.
  • To examine how force transmitted through cell adhesion molecules impacts RhoA.
  • To discuss the upstream and downstream effects of mechanical force-induced RhoA activation.

Main Methods:

  • Literature review focusing on mechanotransduction and RhoA signaling.
  • Analysis of signaling cascades initiated by mechanical stress.
  • Examination of RhoA's role in cytoskeletal dynamics, gene expression, and differentiation.

Main Results:

  • Mechanical forces converge on pathways that activate RhoA, particularly when transmitted via cell adhesion molecules.
  • Upstream signaling events mediate force-induced RhoA activation.
  • Downstream consequences include cytoskeletal reorganization, increased myosin contraction, and altered gene expression.

Conclusions:

  • Mechanical forces are critical regulators of cellular processes via RhoA activation.
  • Understanding these pathways provides insight into cell mechanics, gene regulation, and differentiation.
  • Cell adhesion molecules play a key role in transmitting mechanical signals to intracellular pathways.