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Related Concept Videos

Cell Migration01:09

Cell Migration

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.
Introduction to Membrane Traffic01:44

Introduction to Membrane Traffic

The ER, Golgi apparatus, endosomes, and lysosomes work in tandem to modify, sort, and package proteins and lipids. An integrated membrane trafficking network facilitates the back and forth shuttling of molecules within different organelles in the same cell or across the cell membrane.
The transport of soluble and membrane proteins is mediated by transport vesicles that collect cargo from one cellular compartment and deliver it to another by fusing with the target organelle membrane. The Rab...
Cell Migration01:19

Cell Migration

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.
Role of Myosin in Cell Migration01:18

Role of Myosin in Cell Migration

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Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

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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Related Experiment Video

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Study of Cell Migration in Microfabricated Channels
09:36

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Published on: February 21, 2014

Cell migration: GAPs between membrane traffic and the cytoskeleton.

I de Curtis1

  • 1Laboratory of Cell Adhesion, Department of Molecular Pathology and Medicine, DIBIT-San Raffaele Scientific Institute, Via Olgettina, 58, Milan 20132, Italy. decurtis.ivan@hsr.it

EMBO Reports
|April 18, 2001
PubMed
Summary

Cell migration involves coordinated activity between membrane traffic, adhesion, and actin reorganization. Recent findings suggest that multi-domain proteins with ArfGAP domains may bridge these processes. These proteins interact with actin regulators and integrin-binding proteins, and influence protrusive activity and cell migration. Their localization to endocytic compartments suggests a role in regulating membrane traffic. Functional assays support their role in linking membrane traffic and cytoskeletal reorganization. The study proposes that ArfGAP-containing proteins act as molecular devices during cell migration. This could explain how membrane trafficking and actin dynamics are synchronized. The findings provide a framework for future investigations into cell migration mechanisms.

Keywords:
ArfGAP proteinscell migration mechanismsmembrane traffic regulationcytoskeletal reorganization

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Area of Science:

  • Cell motility mechanisms in developmental biology
  • Membrane trafficking in cell biology
  • Cytoskeletal regulation in molecular biology

Background:

Cell migration requires synchronized activity between membrane traffic, adhesion, and actin reorganization. Prior research has shown that Rho GTPases regulate actin dynamics. Endocytic processes also influence cell front extension. However, the exact molecular links between membrane trafficking and cytoskeletal changes remain unclear. No prior work had resolved how these processes are coordinated at the leading edge. That uncertainty drove recent investigations into multi-domain proteins. These proteins may bridge membrane traffic and actin regulation. Their role in endocytosis suggests a broader function in cell migration.

Purpose Of The Study:

This study aimed to explore how membrane traffic and cytoskeletal reorganization are coordinated during cell migration. The specific problem is the lack of clarity about molecular mechanisms linking these processes. The motivation is to identify proteins that bridge membrane trafficking and actin dynamics. Multi-domain proteins with ArfGAP domains were selected for investigation. These proteins interact with both actin regulators and integrin-binding proteins. Their localization to endocytic compartments suggests functional relevance. The goal is to determine if these proteins act as coordinators. This could clarify how protrusive activity is regulated at the cell edge.

Main Methods:

The study focused on multi-domain proteins containing ArfGAP domains. Researchers examined their interactions with actin-regulating and integrin-binding proteins. Localization to endocytic compartments was analyzed using imaging techniques. Functional assays tested their role in Rac-mediated protrusive activity. Protein interactions were mapped using biochemical methods. The effect on membrane traffic was assessed through endocytosis measurements. Comparative analysis compared wild-type and mutant proteins. This approach aimed to identify functional roles in cell migration.

Main Results:

Multi-domain proteins with ArfGAP domains were found to localize to endocytic compartments. These proteins interact with both actin regulators and integrin-binding proteins. They influence Rac-mediated protrusive activity and cell migration. Their presence correlates with endocytosis regulation. Functional assays showed altered protrusive activity in mutant forms. Protein interactions suggest a role in linking membrane traffic and actin dynamics. Localization patterns support their function at the cell edge. These findings suggest a potential coordination mechanism.

Conclusions:

The authors propose that ArfGAP-containing proteins coordinate membrane traffic and cytoskeletal reorganization. These proteins interact with key regulators of actin and adhesion. Their localization to endocytic compartments supports this role. The findings suggest a potential mechanism for protrusive activity. No prior work had resolved how these processes are linked. The hypothesis is that ArfGAPs act as molecular devices during migration. This could explain how membrane trafficking and actin dynamics are synchronized. The study provides a framework for future investigations.

The authors propose that these proteins coordinate membrane traffic and cytoskeletal reorganization during cell migration.

These proteins interact with actin regulators and integrin-binding proteins, influencing Rac-mediated protrusive activity.

Localization to endocytic compartments suggests a role in regulating membrane traffic during cell migration.

These interactions may link adhesion processes to cytoskeletal reorganization at the cell edge.

Functional assays showed altered protrusive activity in mutant forms of these proteins.

The findings suggest a potential mechanism for coordinating membrane traffic and actin dynamics during cell migration.