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Tumor metastasis and nm23: current concepts
1Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.
Abstract:
Reduced expression and/or somatic allelic deletion of nm23 is associated with high metastatic potential in several types of rodent tumors and human breast and colorectal carcinomas. Transfection of murine nm23-1 cDNA into highly metastatic murine K-1735 TK melanoma cells results in a reduced incidence of primary tumor formation, significant reduction in tumor metastatic potential, and altered responsiveness to the cytokine, transforming growth factor beta. Here we discuss emerging concepts concerning nm23, such as its varied pattern of alteration/expression in tumor metastasis, its effect on tumorigenesis, and its possible biochemical functions.
Insights
Reduced nm23 expression correlates with increased tumor metastasis. Introducing nm23-1 cDNA into melanoma cells decreased tumor formation and spread, suggesting nm23
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Reduced expression or deletion of nm23 is linked to high metastatic potential in various rodent and human tumors.
- nm23 alterations are observed in breast and colorectal carcinomas.
Purpose of the Study:
- To investigate the role of nm23 in tumor metastasis and tumorigenesis.
- To explore the effect of nm23-1 cDNA transfection on melanoma cell behavior and responsiveness to transforming growth factor beta.
Main Methods:
- Transfection of murine nm23-1 cDNA into highly metastatic murine K-1735 TK melanoma cells.
- Assessment of primary tumor formation, metastatic potential, and cellular response to transforming growth factor beta.
Main Results:
- Transfection led to a reduced incidence of primary tumor formation.
- A significant reduction in tumor metastatic potential was observed.
- Altered responsiveness to transforming growth factor beta was noted in the transfected cells.
Conclusions:
- nm23 plays a crucial role in regulating tumor metastasis.
- nm23-1 gene transfer can suppress melanoma metastasis.
- Further research into nm23's biochemical functions and its role in tumorigenesis is warranted.