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Molecular inhibition of cancer cell invasion and metastasis
V Castronovo1, W G Stetler-Stevenson, M E Sobel
1Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.
Abstract:
A group of coordinated cellular processes, not just one gene product, is responsible for invasion and metastasis, the most life-threatening aspect of cancer. It is now recognized that negative factors may be just as important as positive elements. Genetic changes causing an imbalance of growth regulation lead to uncontrolled proliferation necessary for both primary tumor and metastasis expansion. However, unrestrained growth does not, by itself, cause invasion and metastasis. This phenotype may require additional genetic changes. Thus, tumorigenicity and metastatic potential have both overlapping and separate features. Invasion and metastasis can be facilitated by proteins which stimulate tumor cell attachment to host cellular or extracellular matrix determinants, tumor cell proteolysis of host barriers, such as the basement membrane, tumor cell locomotion, and tumor cell colony formation in the target organ for metastasis. Facilitory proteins may act at many levels both intracellularly and extracellularly, but are counterbalanced by factors which can block their production, regulation or action. A common theme has emerged: in addition to loss of growth control, an imbalanced regulation of adhesion, proteolysis, and motility appears to be required for invasion and metastasis. Re-equilibrating the expression of the genes involved in these tumor invasion related events could potentially constitute the basis for new anti-cancer therapeutic strategies.
Insights
Cancer invasion and metastasis involve coordinated cellular processes, not single genes. Re-balancing gene expression controlling adhesion, proteolysis, and motility offers new therapeutic strategies.
Area of Science:
- Oncology
- Cell Biology
- Molecular Biology
Background:
- Cancer invasion and metastasis are complex processes driven by coordinated cellular activities, not solely by individual gene products.
- While genetic changes leading to uncontrolled proliferation are necessary for tumor growth, they are insufficient for metastasis.
- Negative regulatory factors play a crucial role alongside positive ones in cancer progression.
Purpose of the Study:
- To elucidate the multifaceted cellular processes underlying cancer invasion and metastasis.
- To identify key molecular mechanisms and regulatory factors involved in tumor spread.
- To explore potential therapeutic targets for inhibiting cancer metastasis.
Main Methods:
- Analysis of coordinated cellular processes involved in cancer cell attachment, invasion, and migration.
- Investigation of the role of specific proteins facilitating tumor cell interaction with the host environment.
- Examination of the balance between factors promoting and inhibiting invasion and metastasis.
Main Results:
- Cancer invasion and metastasis require a combination of genetic changes leading to uncontrolled proliferation and additional alterations.
- Proteins facilitating tumor cell attachment, extracellular matrix degradation, and locomotion are critical for metastasis.
- An imbalance in the regulation of adhesion, proteolysis, and motility, alongside loss of growth control, is essential for the metastatic phenotype.
Conclusions:
- Cancer metastasis is a complex phenotype requiring coordinated cellular events and genetic alterations.
- Therapeutic strategies targeting the imbalanced regulation of adhesion, proteolysis, and motility could offer novel anti-cancer treatments.