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Selective antiproliferative effects of thymidine
1Department of Biochemistry, National University of Singapore, Kent Ridge.
Experientia
|July 5, 1993
Summary
Natural nucleoside thymidine, found in Cordyline terminalis, exhibits antiproliferative effects on specific cancer cells. It inhibits cell replication and viability, impacting cell cycle progression.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- Cordyline terminalis extracts contain compounds with antiproliferative activity.
- Natural nucleosides play crucial roles in cellular processes and can exhibit biological effects.
Purpose of the Study:
- To identify and characterize the antiproliferative substance from Cordyline terminalis extract.
- To investigate the mechanism and specificity of thymidine's effect on cancer cell proliferation.
Main Methods:
- Purification of the active compound using mass spectrometry.
- Cell culture experiments using EL4, MCF7, and K36 cell lines.
- Cell cycle analysis (S and G1 phases) and viability assays.
- Inhibition studies using nitrobenzylthioinosine to block thymidine entry.
Main Results:
- The antiproliferative substance was identified as the natural nucleoside thymidine.
- Thymidine (10^-5 M) inhibited EL4 cell replication and viability, increasing S phase and decreasing G1 phase cells.
- Nitrobenzylthioinosine protected cells, indicating facilitated entry is necessary for thymidine's action.
- Thymidine selectively inhibited MCF7 (human breast cancer) but not K36 (murine lymphoma) cells.
Conclusions:
- Submillimolar concentrations of thymidine possess selective antiproliferative activity.
- The effects are specific to the thymidine molecule and vary across different tumor cell lines.
- Thymidine's mechanism involves interference with cell cycle progression, likely via facilitated transport.