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Updated: Aug 13, 2026
Injection of Syngeneic Murine Melanoma Cells to Determine Their Metastatic Potential in the Lungs
Published on: May 24, 2016
Release of tumor-associated antigens by murine melanoma cells
Abstract:
Synthesis and release of radiolabeled macromolecules and tumor-associated antigens (MAA) by murine B16 melanoma was studied by pulse labeling cells in culture with 3H-leucine. Approximately 36% of newly synthesized macromolecules and 44% of newly synthesized MAA were released in 48 hr. MAA release was slightly, but consistently, more rapid than the average release of other macromolecules. Release of MAA did not result solely from cell death since it was greater than that of 51Cr-labeled molecules and cell viability was over 98%. The rate of release of newly synthesized MAA was not significantly influenced by cell replication. However, synthesis of MAA was much greater during the logarithmic than the stationary phase of cell growth, suggesting a concomitant increase in the amount of MAA available for release. These findings indicate that antigens and other macromolecules can be rapidly released by viable tumor cells.
Insights
Murine B16 melanoma cells release significant amounts of tumor-associated antigens (MAA) and other macromolecules. This release occurs rapidly from viable cells, independent of cell death or replication.
Area of Science:
- Biochemistry
- Cell Biology
- Immunology
Background:
- Tumor-associated antigens (MAA) are crucial in cancer research and immunotherapy.
- Understanding the release mechanisms of MAA from tumor cells is vital for developing effective cancer treatments.
Purpose of the Study:
- To investigate the synthesis and release kinetics of radiolabeled macromolecules and MAA from murine B16 melanoma cells.
- To determine if MAA release is linked to cell death or replication.
Main Methods:
- Pulse labeling of B16 melanoma cells in culture with 3H-leucine.
- Quantification of released radiolabeled macromolecules and MAA over 48 hours.
- Assessment of cell viability and comparison with 51Cr-labeled molecule release.
Main Results:
- Approximately 36% of newly synthesized macromolecules and 44% of MAA were released within 48 hours.
- MAA release was consistently more rapid than other macromolecules.
- MAA release exceeded that of 51Cr-labeled molecules, indicating it did not solely result from cell death (viability >98%).
- MAA synthesis was significantly higher during logarithmic growth compared to stationary phase.
Conclusions:
- Viable tumor cells can rapidly release both MAA and other macromolecules.
- MAA release is an active process not solely dependent on cell lysis.
- Cell growth phase influences MAA synthesis, impacting the pool available for release.
