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Steps in tumor metastasis: new concepts from intravital videomicroscopy
A F Chambers1, I C MacDonald, E E Schmidt
1Department of Oncology, University of Western Ontario, London, Canada.
Abstract:
Metastases are responsible for the majority of failures in cancer treatment. Clarifying steps in metastasis and their molecular mechanisms will be important for the development of anti-metastasis therapeutic strategies. Considerable progress has been made in identifying molecules involved in metastasis. However, because of the nature of assays that have been available, conclusions about steps in metastasis and their molecular bases have been drawn primarily from inference. In order to complete the picture of how metastases form, a technique is needed to directly watch the process in vivo as it occurs over time. We have developed an intravital videomicroscopy (IVVM) procedure to make such observations possible. Results from IVVM are providing us with new conceptual understanding of the metastatic process, as well as the nature and timing of the contributions of molecules implicated in metastasis (e.g. adhesion molecules and proteinases). Our findings suggest that early steps in metastasis, including hemodynamic destruction and extravasation, may contribute less to metastatic inefficiency than previously believed. Instead, our results suggest that the control of post-extravasation growth of individual cancer cells is a significant contributor to metastatic inefficiency. Thus, this stage may be an appropriate target for design of novel strategies to prevent metastases.
Insights
Understanding cancer metastasis is key to developing new treatments. New intravital videomicroscopy (IVVM) reveals that controlling cancer cell growth after they spread is crucial for preventing metastasis.
Area of Science:
- Oncology
- Cancer Biology
- Molecular Biology
Background:
- Metastasis is the primary cause of cancer treatment failure.
- Current understanding of metastatic processes relies heavily on indirect evidence.
- Developing effective anti-metastasis therapies requires direct observation of metastasis in vivo.
Purpose of the Study:
- To develop a technique for direct, real-time observation of metastasis in vivo.
- To gain new insights into the molecular mechanisms and temporal dynamics of metastasis.
- To identify critical stages and targets for anti-metastasis therapeutic strategies.
Main Methods:
- Development and application of an intravital videomicroscopy (IVVM) procedure.
- Direct observation of metastatic processes over time in a living organism.
- Analysis of the contributions of molecules like adhesion molecules and proteinases to metastasis.
Main Results:
- IVVM provides a direct view of metastasis, offering new conceptual understanding.
- Early metastatic steps like hemodynamic destruction and extravasation may be less critical than previously thought.
- Control of post-extravasation cancer cell growth appears to be a major factor in metastatic inefficiency.
Conclusions:
- Intravital videomicroscopy (IVVM) is a powerful tool for studying metastasis.
- Post-extravasation cancer cell growth is a critical, potentially targetable stage in metastasis.
- Novel strategies targeting cancer cell growth after extravasation could improve anti-metastasis therapies.