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A mammalian cell agar-diffusion assay for the detection of toxic compounds
N S Burres1, J E Hunter, A E Wright
1Division of Biomedical Marine Research, Harbor Branch Oceanographic Institution, Fort Pierce, Florida 34946.
Abstract:
A method using murine P-388 leukemia or human HT-29 colon carcinoma cells was developed for the bioautography of potential antitumor agents. Of 18 cancer chemotherapeutic drugs and natural products tested, all were detected by toxicity at 0.01 or 1.0 micrograms with P-388 cells, and 11 of the 18 were detected at 10 micrograms or less with HT-29 cells. Bioautography of a crude extract of Pseudoplexaura wagenaari and subsequent purification yielded the known compound crassin acetate. With modification, the assay detected specifically toxic DNA-binding agents.
Insights
Researchers developed a bioautography method using leukemia and colon carcinoma cells to detect antitumor agents. This assay successfully identified known compounds and shows promise for discovering novel cancer chemotherapeutics.
Area of Science:
- Pharmacology
- Cancer Biology
- Natural Products Chemistry
Background:
- Bioautography is a powerful technique for identifying bioactive compounds directly from complex mixtures.
- Developing sensitive and specific bioassays is crucial for discovering novel anticancer agents.
- Murine P-388 leukemia and human HT-29 colon carcinoma cell lines offer distinct models for drug screening.
Purpose of the Study:
- To establish a bioautographic method for detecting potential antitumor agents.
- To evaluate the efficacy of the developed method using established chemotherapeutic drugs and natural products.
- To demonstrate the method's capability in identifying specific classes of cytotoxic compounds, such as DNA-binding agents.
Main Methods:
- Utilized murine P-388 leukemia and human HT-29 colon carcinoma cells for bioautography.
- Tested 18 known anticancer drugs and natural products to validate the assay's sensitivity.
- Applied the method to a crude extract of Pseudoplexaura wagenaari to isolate a known compound.
Main Results:
- All 18 tested compounds were detected at low microgram levels using P-388 cells.
- 11 of the 18 compounds were detected at 10 micrograms or less with HT-29 cells.
- The bioautography of Pseudoplexaura wagenaari extract led to the isolation of crassin acetate.
Conclusions:
- The developed bioautographic assay is effective for detecting potential antitumor agents using both leukemia and colon carcinoma cell lines.
- The method demonstrates high sensitivity, capable of identifying compounds at microgram concentrations.
- The assay can be modified to specifically detect DNA-binding cytotoxic agents, aiding in the discovery of targeted cancer therapies.