Alternate header for print version

Attribution Non-Commercial Share Alike:This image is licensed under a Creative Commons Attribution, Non-Commercial Share Alike License. View License Deed | View Legal Code
*CIL – Cell Image Library accession number. Please use this to reference an image.

CIL:26534*  Cite 

To study the molecular mechanism by which nonmuscle myosin II (MII) regulates protrusion and adhesion dynamics in migrating cells, NIH3T3 cells were transfected with myc-tagged phosphomimetic constitutively active MLC mutants (MLCaa, green). After 20' exposure to PDGF, which induces myosin-inactivation, stress fiber disassembly, and stimulates fibroblast motility, cells were co-stained for βPIX (a Rac1/Cdc42-specific GEF highly implicated in cell motility, red) and filamentous actin (blue). These findings help elucidate a functional link between MII and Rac1/Cdc42 GTPases, which may regulate protrusion/adhesion dynamics in migrating cells. This image is original data file Fig. 7C "PDGF-induced dissociation of the MII–βPIX complex," in J. Cell Biol. 2010. Vol. 190(4):663–674

Technical Details

Cells were cultured in DME (Invitrogen) supplemented with 10% fetal bovine serum and 100 U/ml penicillin/streptomycin (Invitrogen) at 37°C in a humidified 5% CO2 incubator. For transfections, cells in 60-mm-diameter dishes or on fibronectin-coated coverslips were incu- bated with a mixture of DNA and LipofectAMINE 2000 (Invitrogen) according to the manufacturer’s instructions. The cDNA for MLC was subcloned into pCMV-myc (Takara Bio Inc.). Mutant constructs of MLC were generated using a QuikChange site-directed mutagenesis kit (Agilent Technologies) according to the manufacturer’s protocol. In this myc-tagged MLC mutant, Ser1/Ser2 were replaced by alanines, and expressed in NIH3T3 cells. In some experimental conditions, 16 h after replating onto fibronectin-coated coverslips, cells were treated with 50 ng/ml PDGF for 20 min. Cells were fixed 24–48 h after transfection using 3.7% paraformaldehyde in PBS for 15 min, permeabilized using 0.2% Triton X-100 in PBS for 2 min, blocked with 2% BSA in PBS, and co-stained for MLC (green), TRIO (red), and actin (blue). Images were captured by Zeiss LSM 710 confocal microscope with Plan-Apochromat 63X objective.

Biological Sources
NCBI Organism Classification
Mus musculus
Cell Type
Cell Line
Cellular Component
myosin II complex
actin filament
Biological Context
Biological Process
regulation of cell migration
Chan-Soo Lee
Chang-Ki Choi
Eun-Young Shin
Martin Alexander Schwartz
Eung-Gook Kim
J. Cell Biol. 2010. Vol. 190(4):663–674
Digital Object Identifier (DOI)
Archival Resource Key (ARK)
Grouping This image is part of a group.
Image Type
recorded image
Image Mode
confocal microscopy
Parameters Imaged
fluorescence emission
Source of Contrast
distribution of epitope
distribution of a specific protein
Visualization Methods
Alexa Fluor 488
Alexa Fluor 546
Data Qualifiers
raw, unprocessed data
Sample Preparation
formaldehyde fixed tissue
detergent permeabilized
Relation To Intact Cell
dispersed cells in vitro
Spatial Axis Image Size Pixel Size
X 512px ——
Y 512px ——