Related Experiment Videos
Reduced cell motility and enhanced focal adhesion contact formation in cells from FAK-deficient mice
1Department of Morphogenesis, Kumamoto University School of Medicine, Japan.
Abstract:
The intracellular protein tyrosine kinase FAK (focal adhesion kinase) was originally identified gy its high level of tyrosine phosphorylation in v-src-transformed cells. FAK is also highly phosphorylated during early development. In cultured cells it is localized to focal adhesion contacts and becomes phosphorylated and activated in response to integrin-mediated binding of cells to the extracellular matrix, suggesting an important role in cell adhesion and/or migration. We have generated FAK-deficient mice by gene targeting to examine the role of FAK during development. Mutant embryos displayed a general defect of mesoderm development, and cells from these embryos had reduced mobility in vitro. Surprisingly, the number of focal adhesions was increased in FAK-deficient cells, suggesting that FAK may be involved in the turnover of focal adhesion contacts during cell migration.
Insights
Focal adhesion kinase (FAK) is crucial for embryonic development and cell migration. FAK-deficient mice show mesoderm defects and altered focal adhesion dynamics, indicating FAK
Area of Science:
- Cell Biology
- Developmental Biology
- Biochemistry
Background:
- Intracellular protein tyrosine kinase FAK (focal adhesion kinase) identified by high tyrosine phosphorylation in v-src-transformed cells.
- FAK is highly phosphorylated during early development and localized to focal adhesions.
- FAK activation is linked to integrin-mediated cell adhesion and extracellular matrix interactions, suggesting roles in cell adhesion and migration.
Purpose of the Study:
- To investigate the role of FAK during embryonic development using gene targeting.
- To analyze the impact of FAK deficiency on mesoderm development and cell mobility.
Main Methods:
- Gene targeting in mice to create FAK-deficient embryos.
- In vitro analysis of cell mobility from mutant embryos.
- Assessment of focal adhesion number in FAK-deficient cells.
Main Results:
- FAK-deficient embryos exhibited general defects in mesoderm development.
- Cells from FAK-deficient embryos showed reduced in vitro mobility.
- An increased number of focal adhesions was observed in FAK-deficient cells.
Conclusions:
- FAK plays a critical role in embryonic mesoderm development and cell migration.
- The findings suggest FAK is involved in the turnover of focal adhesion contacts during cell migration.
- FAK deficiency leads to altered focal adhesion dynamics and impaired cell motility.