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Potato disc tumor induction assay: a multiple mode of drug action assay
1Department of Plant Pathology and Physiology, Clemson University, Clemson, SC 29634-0377, U.S.A. PCOKER@CLEMSON.EDU
Abstract:
The study reported herein utilized the Agrobacterium tumefaciens-induced potato disc tumor assay. The objective was to verify the detection of antineoplastic activity in the potato disc tumor induction assay, regardless of the mode of antineoplastic drug action. Camptothecin, paclitaxel, podophyllin, vinblastine and vincristine were tested, each with a different mode of action. All drugs tested inhibited tumor induction. The order of activity was: camptothecin = paclitaxel = vinblastine < podophyllin = vincristine. No effect on the viability of the bacterium was detected. The A. tumefaciens-induced potato disc tumor assay was an effective indicator of antitumor activity regardless of the mechanism of drug action. Thus, this assay would be acceptable as a primary general screen for antineoplastic activity of various crude extracts, as well as for purified fractions, regardless of mode of inhibitory action on tumor formation.
Insights
The Agrobacterium tumefaciens-induced potato disc tumor assay effectively detects antineoplastic activity. This assay is suitable for screening antitumor compounds, regardless of their mechanism of action.
Area of Science:
- Oncology
- Plant Pathology
- Microbiology
Background:
- The Agrobacterium tumefaciens-induced potato disc tumor assay is a model system for studying plant tumor formation.
- Identifying novel antineoplastic agents requires robust screening methods that are independent of drug mechanism.
Purpose of the Study:
- To validate the Agrobacterium tumefaciens-induced potato disc tumor assay as a general screen for antineoplastic activity.
- To assess the assay's efficacy across various anticancer drugs with different mechanisms of action.
Main Methods:
- Utilized the Agrobacterium tumefaciens-induced potato disc tumor assay.
- Tested five known antineoplastic drugs: camptothecin, paclitaxel, podophyllin, vinblastine, and vincristine.
- Assessed tumor induction inhibition and bacterial viability.
Main Results:
- All tested drugs demonstrated significant inhibition of tumor induction.
- The order of observed antineoplastic activity was camptothecin = paclitaxel = vinblastine < podophyllin = vincristine.
- No adverse effects on Agrobacterium tumefaciens viability were observed.
Conclusions:
- The Agrobacterium tumefaciens-induced potato disc tumor assay is a reliable indicator of antitumor activity, irrespective of the drug's mechanism.
- This assay is suitable for primary screening of crude extracts and purified fractions for general antineoplastic potential.