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Potential roles for focal adhesion kinase in development
1Department of Physiology, University of Alberta, Edmonton, Canada.
Abstract:
Focal adhesion kinase (pp125FAK or FAK) is a protein tyrosine kinase which is associated with intracellular signalling cascades which are initiated when the integrin family of cell adhesion molecules engage extracellular matrix molecules. In cultured cells, this molecule is physically associated with focal adhesions, which are well-defined regions of intimate cell-to-substratum adhesion. In this location, it interacts with other proteins of the focal adhesion to activate intracellular signalling events associated with cell adhesion. The in vitro expression of FAK and its level of phosphorylation appear to be related to several physiological phenomena, including cell spreading, cell differentiation, cell locomotion and cell death. Because these phenomena are all of critical importance during morphogenesis, and because FAK is expressed in embryonic cells, evidence has been accumulating to indicate that FAK may be an important modulator of developmental processes. In this review, this evidence is surveyed together with evidence from analogous situations, such as tumour cell migration and invasiveness. Although evidence suggesting a role for FAK in morphogenesis is accumulating, current uncertainties regarding its cytoplasmic location and its molecular interactions in vivo make it difficult to reach definitive conclusions regarding the significance of its contributions to developmental processes.
Insights
Focal adhesion kinase (FAK) is crucial for cell adhesion and signaling. While FAK influences cell behaviors vital for development, its precise in vivo role in morphogenesis requires further investigation.
Area of Science:
- Cell Biology
- Developmental Biology
- Biochemistry
Background:
- Focal adhesion kinase (FAK) is a protein tyrosine kinase linked to intracellular signaling cascades initiated by integrin engagement with the extracellular matrix.
- FAK associates with focal adhesions, mediating cell-to-substratum adhesion and activating signaling events.
- FAK expression and phosphorylation are implicated in cell spreading, differentiation, locomotion, and death.
Purpose of the Study:
- To review evidence supporting FAK's role as a modulator of developmental processes.
- To survey evidence from analogous situations like tumor cell migration and invasiveness.
Main Methods:
- Literature review of existing studies on FAK.
- Analysis of FAK's involvement in cell adhesion and signaling pathways.
- Comparison with FAK's role in pathological processes like cancer metastasis.
Main Results:
- FAK plays a role in fundamental cellular processes critical for morphogenesis.
- Evidence suggests FAK influences cell adhesion, migration, and survival during development.
- Analogous roles are observed in tumor cell migration and invasiveness.
Conclusions:
- Accumulating evidence suggests FAK is an important factor in developmental processes.
- Further research is needed to clarify FAK's precise in vivo localization and molecular interactions.
- Definitive conclusions on FAK's significance in development await further in vivo studies.