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Synthesis and bioactivity of alkaloids
Research Guide
What is Synthesis and bioactivity of alkaloids?
Synthesis and bioactivity of alkaloids is the study of chemical synthesis methods for alkaloids and their pharmacological properties, including anticancer, antimalarial, DNA binding, antioxidant, and cytotoxic effects, with a focus on beta-carboline alkaloids such as harmine and cryptolepine.
This field encompasses 11,586 published works examining the biochemical and therapeutic functions of alkaloids. Research highlights beta-carboline alkaloids like harmine and cryptolepine for their anticancer agents, antiplasmodial activity, DNA binding, antioxidant properties, and cytotoxicity. Key studies demonstrate alkaloids such as camptothecin targeting mammalian DNA topoisomerase I to induce protein-linked DNA breaks.
Topic Hierarchy
Research Sub-Topics
Beta-Carboline Alkaloids Synthesis
This sub-topic covers synthetic routes to harmine, harmaline, and related beta-carbolines using Pictet-Spengler and metal-catalyzed methods. Researchers optimize yields, regioselectivity, and scalability for therapeutic applications.
Pharmacological Activities of Harmine
This sub-topic investigates harmine's monoamine oxidase inhibition, neuroprotective effects, and anticancer mechanisms via kinase modulation. Researchers conduct in vitro and in vivo studies on bioavailability and toxicity.
Cryptolepine Antimalarial Activity
This sub-topic examines cryptolepine's DNA intercalation and heme polymerization inhibition against Plasmodium species. Researchers evaluate resistance profiles, analogs, and clinical translation potential.
Alkaloids DNA Binding Mechanisms
This sub-topic elucidates groove binding, intercalation, and topoisomerase inhibition by beta-carbolines using spectroscopy and crystallography. Researchers correlate binding affinity with cytotoxic potency.
Cytotoxic Properties of Indole Alkaloids
This sub-topic profiles cytotoxicity of marine and plant-derived indole alkaloids against cancer cell lines via apoptosis induction. Researchers screen derivatives for selectivity and synergistic combinations.
Why It Matters
Alkaloids from this field serve as anticancer agents by interfering with DNA topoisomerase enzymes, as shown in "Camptothecin induces protein-linked DNA breaks via mammalian DNA topoisomerase I" where Y H Hsiang et al. (1985) identified camptothecin's potent induction of strand breaks in chromosomal DNA, leading to its development into drugs like CPT-11. Traditional medicinal plants containing alkaloids contribute to drug discovery, with Daniel S. Fabricant and N.R. Farnsworth (2001) emphasizing ethnomedicine's role in selecting candidates yielding successful pharmaceuticals. Phytochemicals from alkaloids show preclinical to clinical anticancer efficacy, as reviewed by Amit Choudhari et al. (2020) noting their impact despite challenges with synthetic drugs.
Reading Guide
Where to Start
"Camptothecin induces protein-linked DNA breaks via mammalian DNA topoisomerase I" by Y H Hsiang et al. (1985) as it provides a foundational mechanism of alkaloid bioactivity with clear experimental evidence on DNA topoisomerase I inhibition.
Key Papers Explained
Y H Hsiang et al. (1985) in "Camptothecin induces protein-linked DNA breaks via mammalian DNA topoisomerase I" established camptothecin's topoisomerase I targeting, which Yaw Huei Hsiang and Leroy F. Liu (1988) confirmed as the intracellular target in "Identification of mammalian DNA topoisomerase I as an intracellular target of the anticancer drug camptothecin." K M Tewey et al. (1984) extended this to topoisomerase II in "Intercalative antitumor drugs interfere with the breakage-reunion reaction of mammalian DNA topoisomerase II," while Yasuyoshi Kawato et al. (1991) built on camptothecin derivatives in "Intracellular roles of SN-38, a metabolite of the camptothecin derivative CPT-11, in the antitumor effect of CPT-11." Sarah E. O’Connor and Justin J. Maresh (2006) provided biosynthetic context in "Chemistry and biology of monoterpene indole alkaloid biosynthesis."
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Research centers on beta-carboline alkaloids like harmine and cryptolepine for anticancer, antimalarial, and antioxidant applications, as indicated by the 11,586 works in the cluster. No recent preprints or news in the last 12 months signal steady focus on established mechanisms like DNA topoisomerase inhibition from top papers.
Papers at a Glance
Frequently Asked Questions
What is the mechanism of camptothecin as an alkaloid anticancer agent?
Camptothecin inhibits mammalian DNA topoisomerase I, inducing protein-linked DNA breaks without direct DNA interaction. Y H Hsiang et al. (1985) demonstrated this in "Camptothecin induces protein-linked DNA breaks via mammalian DNA topoisomerase I," showing its role in halting nucleic acid synthesis. The effect traps the reversible topoisomerase I-DNA complex, causing cytotoxicity.
How do traditional plants contribute to alkaloid drug discovery?
Plants used in traditional medicine provide leads for alkaloid-based drugs through ethnomedicine. Daniel S. Fabricant and N.R. Farnsworth (2001) outlined approaches in "The value of plants used in traditional medicine for drug discovery," stressing information from traditional systems maximizes success. This method has identified bioactive alkaloids like camptothecin.
What are key biosynthesis pathways for monoterpene indole alkaloids?
Monoterpene indole alkaloids, including anticancer types, follow specific biosynthetic pathways detailed up to 2006. Sarah E. O’Connor and Justin J. Maresh (2006) covered chemistry and biology in "Chemistry and biology of monoterpene indole alkaloid biosynthesis." These pathways enable synthesis of compounds with DNA-interacting properties.
How do intercalative alkaloids target DNA topoisomerase II?
Intercalative antitumor alkaloids like ellipticine produce reversible protein-linked DNA breaks via mammalian DNA topoisomerase II. K M Tewey et al. (1984) showed this in "Intercalative antitumor drugs interfere with the breakage-reunion reaction of mammalian DNA topoisomerase II." The drugs disrupt the enzyme's breakage-reunion reaction.
What is the role of SN-38 in camptothecin derivative antitumor effects?
SN-38, a metabolite of CPT-11 (a camptothecin derivative), exhibits stronger in vitro cytotoxicity than the parent compound. Yasuyoshi Kawato et al. (1991) detailed its intracellular roles in "Intracellular roles of SN-38, a metabolite of the camptothecin derivative CPT-11, in the antitumor effect of CPT-11." This contributes to CPT-11's in vivo antitumor activity.
Open Research Questions
- ? How can synthesis methods for beta-carboline alkaloids like harmine be optimized for enhanced anticancer selectivity?
- ? What structural modifications improve the DNA binding affinity and antiplasmodial activity of cryptolepine derivatives?
- ? Which antioxidant mechanisms of beta-carboline alkaloids best mitigate cytotoxicity in non-target cells?
- ? How do beta-carboline alkaloids interact with multiple pharmacological targets simultaneously?
Recent Trends
The field maintains 11,586 works with sustained interest in beta-carboline alkaloids' pharmacological functions, including harmine and cryptolepine's anticancer and antiplasmodial roles.
No growth rate data over 5 years or recent preprints in the last 6 months available, reflecting consolidation of findings from high-citation papers like those on camptothecin by Y H Hsiang et al. and Leroy F. Liu (1988).
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