SWAP-70 is important for invasive phenotypes of mouse embryo fibroblasts transformed by v-Src.
SWAP-70 is a protein involved in actin rearrangement, especially in membrane ruffling. Mouse embryo fibroblasts (MEFs) deficient in SWAP-70 show impaired membrane ruffling and fail to grow in soft agar after transformation by v-Src. Here, we show that v-Src transformed MEFs expressing SWAP-70 are highly invasive. MEFs expressing SWAP-70 or v-Src alone were far less invasive, suggesting that both proteins were required for the cells to be invasive. Expression of both SWAP-70 and v-Src induced constant membrane ruffling, which may cause vigorous cell movement, probably required for invasiveness of the cells. Expression of v-Src alone morphologically transformed MEFs but formed lamellipodia rather than membrane ruffles, suggesting less aggressive nature of the cells compared with those expressing both SWAP-70 and v-Src. These results suggest that v-Src and SWAP-70 act synergistically in the invasion activity of MEFs.
Murugan
Avaniyapuram Kannan
AK
Department of Molecular Cellular Oncology and Microbiology, Tokyo Medical and Dental University, Tokyo, Japan.
Ihara
Sayoko
S
Tokuda
Emi
E
Uematsu
Kimio
K
Tsuchida
Nobuo
N
Fukui
Yasuhisa
Y
D000199:Actins / Q000378:metabolism; D000818:Animals; D002465:Cell Movement / Q000502:physiology; D002471:Cell Transformation, Neoplastic; D002478:Cells, Cultured; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D005347:Fibroblasts / Q000166:cytology / Q000473:pathology / Q000502:physiology*; D016391:Genes, src; D020662:Guanine Nucleotide Exchange Factors / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D015778:Minor Histocompatibility Antigens; D009361:Neoplasm Invasiveness; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D010641:Phenotype
D000199:Actins; D004268:DNA-Binding Proteins; D020662:Guanine Nucleotide Exchange Factors; D015778:Minor Histocompatibility Antigens; D009687:Nuclear Proteins; C113365:Swap70 protein, mouse