Related Experiment Videos
Reduced invasive and metastatic potentials of KAI1-transfected melanoma cells
Abstract:
KAI1 is a metastasis suppressor gene for human prostate cancer. To reveal the effect of KAI1 on the in vivo metastasis of tumors other than prostatic cancer, we transfected a human KAI1 cDNA into highly metastatic B16-BL6 murine melanoma cells and established stable transfectant clones with different expression levels of KAI1 message. The following results were obtained with the use of those transfectants. (1) Cell aggregation assay revealed a significantly enhanced Ca(2+)-independent aggregation of B16-BL6 cells by KAI1 cDNA transfection compared with mock transfectants (P < 0.01). (2) The in vivo phagokinetic activity and invasive ability of KAI1 transfectants were clearly decreased as compared with those of mock transfectants (P < 0.01). There was no significant effect of KAI1 expression on the in vitro or in vivo proliferation of B16-BL6 cells. (3) Lung colony formation of intravenously injected KAI1 transfectants in nude mice was significantly reduced as compared with mock transfectants or parental B16-BL6 cells (P < 0.01). These data suggest that KAI1 expression gives rise to the suppression of invasive and metastatic potentials of B16-BL6 cells.
Insights
The KAI1 gene suppresses metastasis in human prostate cancer. Introducing KAI1 into melanoma cells reduced their ability to invade and form tumors, indicating KAI1
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- KAI1 is recognized as a metastasis suppressor gene in human prostate cancer.
- The role of KAI1 in the metastasis of other cancer types remains less understood.
Purpose of the Study:
- To investigate the effect of KAI1 on the in vivo metastasis of non-prostate tumors.
- To determine if KAI1 can suppress the metastatic potential of highly metastatic murine melanoma cells.
Main Methods:
- Human KAI1 cDNA was transfected into highly metastatic B16-BL6 murine melanoma cells.
- Stable transfectant clones with varying KAI1 expression levels were established.
- Assays included cell aggregation, in vivo phagokinetic activity, invasive ability, proliferation, and lung colony formation in nude mice.
Main Results:
- KAI1 transfection significantly enhanced Ca(2+)-independent cell aggregation.
- In vivo phagokinetic activity and invasive ability were significantly decreased in KAI1 transfectants.
- KAI1 expression did not affect in vitro or in vivo cell proliferation.
- Lung colony formation was significantly reduced in KAI1 transfectants compared to controls.
Conclusions:
- KAI1 expression suppresses the invasive and metastatic potentials of B16-BL6 melanoma cells.
- These findings suggest KAI1 may have broader applications as a metastasis suppressor in various cancers.