1. [Purification and anti-cancer activity of ricin].
- Author
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Zou LB and Zhan JB
- Subjects
- Animals, Cell Line, Tumor, Colorectal Neoplasms pathology, Dose-Response Relationship, Drug, Humans, K562 Cells, Male, Mice, Rats, Rats, Sprague-Dawley, T-Lymphocytes, Cytotoxic, Antineoplastic Agents, Phytogenic pharmacology, Ricin isolation & purification, Ricin pharmacology
- Abstract
Objective: To extract and purify ricin from castor beans and to evaluate its anti-cancer activity., Methods: Ricin was purified from castor beans according the modified method of Nicolson and Blaustin. The lectins were extracted in 0.01 mol/L phosphate buffered saline and isolated in the 40% to 80% fraction of ammonium sulfate precipitation. The dialyzed fractionated preparation was applied with a Sepharose 4B column. The lectins were eluted with a linear lactose gradient (0.01 mol/L approximately 0.5 mol/L). Ricin was separated from the ricinus agglutinin by gel filtration on a Sephadex G-100. MTT was applied to analyze the cytotoxicity with different dosage of ricin in different cancer cell lines., Results: There was no difference between the killing effect of normal cells and that of colon cancer cells by using the high dosage of ricin (5 x 10(-8) mol/L approximately 5 x 10(-10) mol/L). However, the cytotoxicity was significant different in those cells with the low dosage of ricin (5 x 10(-11) mol/L approximately 5 x 10(-13) mol/L). Meanwhile ricin had the similar cytotoxicity to leukemia cell K562 and colon cancer cell SW480., Conclusion: Ricin is able to kill tumor cells selectively at low concentration, but the selectivity does not appear at high concentrations.
- Published
- 2005
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