Examples of marine-derived pharmaceuticals (Cytarabine, Ziconotide)
Start with the big picture
Marine organisms provide diverse chemical scaffolds, including arabinosyl nucleosides and bioactive peptides. Cytarabine (Ara-C), derived from research on the sponge Cryptotethya crypta, is converted intracellularly to Ara-CTP, which inhibits DNA polymerase α and disrupts DNA elongation during S phase. Its uses include treatment of selected leukemias and lymphomas; myelosuppression is dose-limiting, with other notable adverse effects and preventive eye-drop care discussed. Ziconotide is a synthetic peptide based on ω-conotoxin MVIIA from Conus magus. By blocking presynaptic N-type calcium channels, it reduces release of pain-signaling neurotransmitters. Continuous intrathecal infusion is used for selected severe, refractory pain. The lesson also considers its potential advantages, narrow therapeutic window, contraindications, adverse effects, and monitoring.
What you'll learn
- Describe marine pharmacognosy and identify major marine-derived chemical scaffolds.
- Explain cytarabine’s marine origin, mechanism of action, clinical uses, and important toxicities.
- Describe ziconotide’s source, channel-blocking mechanism, and role in refractory pain.
- Recognize key limitations, contraindications, and monitoring considerations for ziconotide.
- Compare how cytarabine and ziconotide illustrate translation of marine products into medicines.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
