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[Molecular mechanisms controlling cellular proliferation in the vascular system]
1CNRS URA 1160, Institut Pasteur, Lille.
Abstract:
Molecular biological techniques and the study of models allowing elementary analysis have helped to identify the molecular mechanisms controlling cellular proliferation, products of oncogenes and anti-oncogenes and the proteins interacting with these compounds, or the elements of the cytoplasmic clock which controls the cellular cycle. However, analysis of model systems does not always correspond to what happens in vivo where a regulating molecule may have several functions and where certain controls are superfluous. Therefore, the angiogenic factors identified by their action on endothelial cells in vitro and in model systems in vivo are multifunctional molecules. Their expression and that of their receptors are not always associated with angiogenesis in normal or pathological conditions. Similarly, the responses of endothelial cells to these angiogenic factors are not the same in vivo and in culture plates. The authors discuss in more detail the role of the C-ets-1 oncogene which expresses itself in endothelial cells during angiogenesis. The C-ets-1 protein is a transcription factor which may control the expression of genes coding proteases which degrade the extracellular matrix. The description of the role of this molecule in the network controlling angiogenesis should enable the definition or evaluation of therapeutic actions targetting this process.
Insights
Cellular proliferation is controlled by molecular mechanisms, but in vivo studies reveal complexities not seen in lab models. Angiogenic factors, like the C-ets-1 oncogene, play a key role in angiogenesis.
Area of Science:
- Molecular Biology
- Cell Biology
- Oncology
Context:
- In vitro and in vivo models are used to study cellular proliferation and the cell cycle.
- Lab models may not fully represent complex in vivo biological systems.
- Angiogenic factors and their receptors exhibit multifunctional roles and variable expression patterns.
Purpose:
- To explore the molecular mechanisms controlling cellular proliferation.
- To investigate the in vivo relevance of molecular pathways identified in model systems.
- To detail the role of the C-ets-1 oncogene in angiogenesis.
Summary:
- Cellular proliferation is regulated by oncogenes, anti-oncogenes, and cell cycle clock elements.
- Angiogenic factors are multifunctional, and their in vivo actions differ from in vitro observations.
- The C-ets-1 oncogene, a transcription factor, regulates proteases involved in extracellular matrix degradation during angiogenesis.
Impact:
- Understanding the C-ets-1 oncogene's role in angiogenesis can inform therapeutic strategies.
- Highlights the limitations of in vitro models for predicting in vivo biological responses.
- Provides insights into the complex network controlling angiogenesis for potential therapeutic targeting.