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Related Concept Videos

Cell Polarization by Rho Proteins01:21

Cell Polarization by Rho Proteins

Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker proteins that...
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Small GTPases - Ras and Rho01:24

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Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
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Cell Migration01:09

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Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
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Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.

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Related Experiment Video

Updated: May 13, 2026

Analyzing In Vivo Cell Migration using Cell Transplantations and Time-lapse Imaging in Zebrafish Embryos
11:39

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Published on: April 29, 2016

A dual role model for active Rac1 in cell migration.

Jan Faix1, Igor Weber

  • 1Hannover Medical School, Institute for Biophysical Chemistry, Hannover, Germany. faix.jan@mh-hannover.de

Small Gtpases
|March 19, 2013
PubMed
Summary

Rho GTPases, crucial for cell migration, are regulated by novel antagonistic interactions. Rac1 activity in Dictyostelium cells is controlled by two distinct effectors at opposite cell edges, revealing a new regulatory principle.

Keywords:
DGAP1DictyosteliumIQGAPRac1Rho GTPasesSCAR/WAVEactin cytoskeletoncell polarizationcortexillin

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Last Updated: May 13, 2026

Analyzing In Vivo Cell Migration using Cell Transplantations and Time-lapse Imaging in Zebrafish Embryos
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RhoC GTPase Activation Assay
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Comparing the Affinity of GTPase-binding Proteins using Competition Assays
10:37

Comparing the Affinity of GTPase-binding Proteins using Competition Assays

Published on: October 8, 2015

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Rho GTPases are key regulators of cellular processes.
  • Their regulation involves RhoGEFs, RhoGAPs, and RhoGDIs.
  • Additional regulatory mechanisms include post-translational modifications and crosstalk signaling.

Purpose of the Study:

  • To investigate novel regulatory mechanisms of Rho GTPase activity.
  • To elucidate the role of Rac1 in cell migration dynamics.
  • To uncover reciprocal regulation of Rho GTPase activity.

Main Methods:

  • Monitoring specific fluorescent probes in Dictyostelium cells.
  • Analyzing spatiotemporal dynamics of Rac1 activity.
  • Investigating interactions of Rac1-GTP with distinct effectors.

Main Results:

  • Activated Rac1 exhibits opposing localization and kinetics at the leading and trailing edges.
  • Rac1 at the leading edge participates in Scar/WAVE-mediated actin polymerization.
  • Rac1 at the trailing edge induces DGAP1/cortexillin actin-bundling complex formation.

Conclusions:

  • A novel reciprocal regulatory mechanism for Rho GTPase activity involving antagonizing effectors was identified.
  • This mechanism, observed in Rac1 in Dictyostelium, may apply to other Rho GTPases and cell types.
  • Spatiotemporal control of Rac1 by distinct effectors offers a new paradigm for Rho GTPase regulation.