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Inhibition of nucleic acids and protein synthesis by deazaadenosine derivatives: a study on structure-activity
Abstract:
The effect of four deaza-analogues of adenosine on the synthesis of nucleic acids and proteins was investigated in monkey kidney cell line Vero. Cells in exponential growth phase were exposed for two hours to 1, 3 or 10 microM concentrations of 1-deazaadenosine (c1Ado), 3-deazaadenosine (c3Ado), 7-deazaadenosine (c7Ado) or 1,3-dideazaadenosine (c1,3Ado) in a serum free medium; the rate of macromolecules synthesis was estimated after one hour pulse treatment with radiolabelled precursors. At the concentrations used, c1Ado and c3Ado produced no or very little change in the rate of macromolecules synthesis: c1Ado slightly increased RNA synthesis whereas c3Ado was a weak inhibitor of DNA synthesis. Conversely, c7Ado was a potent inhibitor of macromolecules synthesis. Two hours of drug exposure at a concentration of 10 microM, resulted in a 40-50% inhibition in DNA, RNA and protein synthesis rates. c1,3Ado did not significantly affect RNA or protein metabolism but produced a dramatic increase in DNA synthesis. No DNA breaks could be detected in cells exposed to the agents tested in this study.
Insights
Four deaza-adenosine analogues were tested for their effects on cellular synthesis. 7-deazaadenosine strongly inhibited DNA, RNA, and protein synthesis, while 1,3-dideazaadenosine uniquely boosted DNA synthesis.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Deaza-analogues of adenosine are modified nucleosides with potential biological activities.
- Understanding their impact on nucleic acid and protein synthesis is crucial for drug development.
Purpose of the Study:
- To investigate the effects of four deaza-adenosine analogues (c1Ado, c3Ado, c7Ado, c1,3Ado) on macromolecule synthesis in Vero cells.
- To determine the dose-dependent effects of these analogues on DNA, RNA, and protein synthesis.
Main Methods:
- Vero cells were exposed to varying concentrations (1, 3, 10 microM) of deaza-adenosine analogues.
- Macromolecule synthesis rates were measured using radiolabeled precursors after a one-hour pulse.
- Analysis included DNA, RNA, and protein synthesis, as well as detection of DNA breaks.
Main Results:
- 1-deazaadenosine (c1Ado) showed minimal effects, slightly increasing RNA synthesis.
- 3-deazaadenosine (c3Ado) weakly inhibited DNA synthesis.
- 7-deazaadenosine (c7Ado) potently inhibited DNA, RNA, and protein synthesis (40-50% at 10 microM).
- 1,3-dideazaadenosine (c1,3Ado) significantly increased DNA synthesis while not affecting RNA or protein synthesis.
- No DNA breaks were detected for any analogue.
Conclusions:
- Deaza-adenosine analogues exhibit diverse effects on cellular macromolecule synthesis.
- 7-deazaadenosine is a potent inhibitor of DNA, RNA, and protein synthesis.
- 1,3-dideazaadenosine demonstrates a unique stimulatory effect on DNA synthesis.
- These findings highlight the differential impact of adenosine analogue structure on cellular processes.