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Related Experiment Video

Updated: Jun 19, 2026

Concentric Gel System to Study the Biophysical Role of Matrix Microenvironment on 3D Cell Migration

Concentric Gel System to Study the Biophysical Role of Matrix Microenvironment on 3D Cell Migration

Published on: April 3, 2015

Distinct roles for CARMIL isoforms in cell migration.

Yun Liang¹, Hanspeter Niederstrasser, Marc Edwards

¹Department of Cell Biology and Physiology, Washington University, St. Louis, MO 63110, USA.

Molecular Biology of the Cell

|October 23, 2009

Summary

Two CARMIL protein isoforms are crucial for cell migration, with CARMIL1 regulating actin dynamics and CARMIL2 influencing cell polarity through intermediate filaments.

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Analysis of Cell Migration within a Three-dimensional Collagen Matrix

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Published on: October 5, 2014

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Concentric Gel System to Study the Biophysical Role of Matrix Microenvironment on 3D Cell Migration

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Published on: April 3, 2015

Analysis of Cell Migration within a Three-dimensional Collagen Matrix

Analysis of Cell Migration within a Three-dimensional Collagen Matrix

Published on: October 5, 2014

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

The molecular mechanisms integrating signaling and cytoskeletal systems in cell migration remain incompletely understood.
CARMIL (capping protein, Arp2/3, and Myosin-I linker) family proteins are implicated in cell motility.

Purpose of the Study:

To investigate the distinct roles of CARMIL1 and CARMIL2 isoforms in human cell migration.
To elucidate the specific molecular functions and localization of each CARMIL isoform during migration.

Main Methods:

Utilized knockdown techniques to assess the function of CARMIL1 and CARMIL2 in migrating human cultured cells.
Examined protein localization, actin dynamics, cell polarity, and signaling pathway activation (Rac1, GEF Trio, myosin-IIB).

Main Results:

CARMIL1 is essential for lamellipodial actin organization, protrusion, ruffling, and macropinocytosis, associating with Rac1 activation and the GEF Trio.
CARMIL2 localizes with vimentin intermediate filaments and is critical for maintaining cell polarity; its loss leads to a multipolar phenotype and reduced myosin-IIB levels.
Neither CARMIL isoform could rescue the functional defects caused by the knockdown of the other, highlighting their distinct roles.

Conclusions:

CARMIL1 and CARMIL2 play indispensable yet separate roles in cell migration.
CARMIL1 regulates actin-based processes, while CARMIL2 is involved in maintaining cell polarity via intermediate filaments.