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Evaluation of marine sponge metabolites for cytotoxicity and signal transduction activity
R E Longley1, O J McConnell, E Essich
1Harbor Branch Oceanographic Institution, Inc. Fort Pierce, Florida 34946.
Abstract:
Twenty-four metabolites derived from marine sponges were evaluated for their cytotoxicities against two human tumor cell lines, non-small cell lung carcinoma A549 and colon adenocarcinoma HT-29, and against one murine leukemia cell line, P-388, and evaluated for their ability to effect signal transduction in a newly developed cell adhesion assay using an EL-4 cell line. The compounds included latrunculin A [1], batzelline A [2], chondrillin [3], aureol [4], epihippuristanol, theonellamine B, discorhabdins A and C, kabiramide C, dercitin, meridine, manzamines A, B, and C, 8,15-diisocyano-11(20)-amphilectene and the corresponding C-15 formamide, a 20-carbon acetylenic alcohol, 4,5-dihydro-6"-deoxybromotopsentin, epispongiadiol, isospongiadiol, puupehenone, reiswigin A, and demethyl- and demethyloxyaaptamine. Latrunculin A [1], batzelline A [2], chondrillin [3], and aureol [4] expressed the desired profile of a greater than five-fold level of cytotoxicity against A549 relative to P-388, and an effect in the cell adhesion assay. In this group of compounds, cytotoxicity toward A549 was equal to or more pronounced than against HT-29. Latrunculin A was evaluated in an sc-implanted human A549 lung tumor xenograft mouse model and yielded a T/C of 146%. Batzelline A was evaluated in the cancer cell line panel at the National Cancer Institute and found to express selective cytotoxicity against several melanoma cancer cell lines.
Insights
Marine sponge metabolites were screened for anticancer activity. Latrunculin A and batzelline A showed promising cytotoxicity against lung and melanoma cancer cell lines, respectively.
Area of Science:
- Marine natural products chemistry
- Cancer pharmacology
- Signal transduction pathways
Background:
- Marine sponges are a rich source of structurally diverse secondary metabolites.
- Many marine natural products exhibit significant biological activities, including cytotoxicity against cancer cells.
- Understanding the mechanisms of action, such as effects on signal transduction and cell adhesion, is crucial for drug development.
Purpose of the Study:
- To evaluate the cytotoxicities of 24 marine sponge-derived metabolites against human non-small cell lung carcinoma (A549), colon adenocarcinoma (HT-29), and murine leukemia (P-388) cell lines.
- To assess the compounds' ability to modulate signal transduction pathways using a novel cell adhesion assay with EL-4 cells.
- To identify marine natural products with potential as anticancer drug leads.
Main Methods:
- Cytotoxicity assays were performed using A549, HT-29, and P-388 cancer cell lines.
- A cell adhesion assay using EL-4 cells was developed to evaluate effects on signal transduction.
- Compounds with a selective cytotoxicity profile (A549 vs. P-388) and activity in the cell adhesion assay were further investigated.
- Latrunculin A was tested in a human A549 lung tumor xenograft mouse model.
- Batzelline A was screened against a panel of cancer cell lines at the National Cancer Institute.
Main Results:
- Latrunculin A [1], batzelline A [2], chondrillin [3], and aureol [4] exhibited favorable cytotoxicity profiles, with >5-fold greater activity against A549 cells compared to P-388 cells.
- These four compounds also demonstrated activity in the cell adhesion assay.
- Cytotoxicity against A549 cells was comparable or greater than against HT-29 cells for this active group.
- Latrunculin A showed a T/C of 146% in an A549 lung tumor xenograft model.
- Batzelline A displayed selective cytotoxicity against several melanoma cell lines in a broader cancer cell line panel.
Conclusions:
- Latrunculin A and batzelline A are promising marine-derived compounds with significant anticancer potential.
- Latrunculin A demonstrates efficacy in a preclinical lung cancer model.
- Batzelline A shows selectivity for melanoma, suggesting potential for targeted therapy.
- Marine sponge metabolites continue to be a valuable resource for novel anticancer drug discovery.