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Related Experiment Videos

The lethality of aranucleotides

S S Cohen

    Medical Biology
    |December 1, 1976
    PubMed
    Summary

    D-arabinosyl nucleosides like araC and araA show promise in treating leukemia and viral infections. Inhibiting deaminases enhances their effectiveness and toxicity in cancer and virus-infected cells.

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    Area of Science:

    • Biochemistry
    • Pharmacology
    • Virology

    Background:

    • D-arabinosyl nucleosides, including D-arabinosyl cytosine (araC) and D-arabinosyl adenine (araA), are established therapeutic agents.
    • These compounds exhibit cytotoxicity against animal cells and certain bacteria, indicating broad biological activity.

    Purpose of the Study:

    • To elucidate the mechanism of action and cellular fate of D-arabinosyl nucleosides.
    • To explore strategies for enhancing the therapeutic efficacy of these nucleosides, particularly in cancer and viral infections.

    Main Methods:

    • Investigated cellular transport and intracellular phosphorylation of D-arabinosyl nucleosides to their triphosphate forms (araCTP and araATP).
    • Assessed the inhibitory effects of araCTP and araATP on DNA polymerases from tumor cells and viruses.
    • Examined the role of nucleoside deaminase and nucleoside kinase in determining cellular sensitivity.
    • Studied the incorporation of aranucleotides into newly synthesized DNA.

    Main Results:

    • AraCTP and araATP function as competitive inhibitors of tumor cell and viral DNA polymerases, respectively.
    • These nucleosides inhibit DNA synthesis and are incorporated into DNA, disrupting replication.
    • Cellular sensitivity correlates with the balance between nucleoside kinase activity (triphosphate formation) and nucleoside deaminase activity (degradation).
    • Inhibition of nucleoside deaminase significantly increases intracellular levels of the active triphosphate metabolites and enhances nucleoside toxicity.

    Conclusions:

    • Modulating nucleoside deaminase activity represents a viable strategy to potentiate the anti-leukemic and antiviral effects of D-arabinosyl nucleosides.
    • Combinations of deaminase inhibitors with D-arabinosyl nucleosides are under clinical investigation.
    • Further research into improving the cellular penetration of aranucleotides may enhance their utility as antiviral agents, such as against herpes viruses.

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