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Ising model for cooperative processing of extracellular information by protein-tyrosine kinases and cell adhesion
Abstract:
Activation of receptor tyrosine kinases by multiple growth (GFs) is a major process through which mitogenic information is transmitted into cells. Cell cycle progression additionally requires the coordinated interaction of cellular adhesion receptors with extracellular matrix (ECM) molecules. Recent data from several groups, which demonstrated that integrin-ECM contacts promote multiple phosphorylations of intracellular components although the integrin cytoplasmic domains do not have intrinsic protein kinase activity, support the theory that some adhesion receptor families transduce extracellular signals cooperatively with protein-tyrosine kinases (PTKs). Based on the well-established hypothesis that adhesion receptors induce an aggregation of PTKs through a rearrangement of the cytoskeleton, a mathematical minimal model for the regulation of PTKs is presented which accounts for the synergism between different environmental signals mediated by growth factors and cell adhesion molecules (CAM) or cell adhesion associated substances like carcinoembyronic antigen (CEA). The model, which is closely related to a two-dimensional Ising model describing order-disorder transitions in ferromagnetic crystals, provides evidence that a cell-type-specific pattern of cell adhesion molecules may function as a molecular amplifier which promotes the metastatic activity of malignant tumor cells through the indirect induction of intracellular PTK activity.
Insights
Cell adhesion molecules and growth factors synergize to activate protein-tyrosine kinases (PTKs). This interaction, modeled mathematically, suggests cell adhesion patterns amplify PTK activity, potentially driving cancer metastasis.
Area of Science:
- Cell Biology
- Biophysics
- Cancer Research
Background:
- Receptor tyrosine kinases (RTKs) transmit mitogenic signals via growth factors (GFs).
- Cell cycle progression relies on interactions between adhesion receptors and extracellular matrix (ECM).
- Integrin-ECM interactions promote intracellular phosphorylation, suggesting cooperation between adhesion receptors and protein-tyrosine kinases (PTKs).
Purpose of the Study:
- To present a mathematical model for PTK regulation.
- To investigate the synergistic effects of GFs and cell adhesion molecules (CAMs) on PTK activity.
- To explore the role of CAMs in promoting malignant tumor cell metastasis.
Main Methods:
- Developed a minimal mathematical model for PTK regulation.
- The model incorporates synergistic signaling from GFs and CAMs (e.g., carcinoembryonic antigen).
- The model is analogous to a 2D Ising model for order-disorder transitions.
Main Results:
- The model demonstrates how adhesion receptors can induce PTK aggregation via cytoskeletal rearrangement.
- It shows that CAMs and GFs act synergistically to regulate intracellular PTK activity.
- Evidence suggests cell adhesion molecule patterns act as molecular amplifiers for PTK activity.
Conclusions:
- Cell adhesion molecule patterns may amplify PTK activity, contributing to cancer cell metastasis.
- The mathematical model provides insights into the cooperative signaling between adhesion receptors and PTKs.
- This mechanism highlights a potential pathway for targeted cancer therapies.