Generic Antibody Therapy, Polyclonal and Monoclonal, on Ricin Toxin Extracted from Several Cultivars of the Castor Plant (Ricinus Communis)
Pp. 98-109 (12)
Rayanne Hilsen, Scott J. Jager and John W. Cherwonogrodzky
Castor beans, from 10 different cultivars of Ricinus communis, were acquired
from different commercial sources from three different countries. Ricin was extracted
from 25 grams of beans from each cultivar. Resulting toxin yields varied from
negligible to relatively high. Two methods of extraction were used, with one method
yielding on average 7-fold more toxin than the other. Reducing SDS-PAGE showed that
most of the ricin extractions had not only the A and B chains, but also additional bands
of comparable molecular weights similar to those noted in the historical literature.
Results from intra-peritoneal injection (i.p.) of mice, given the same amount of ricin
extracted from different cultivars, varied in toxicity up to 10-fold. Regardless of the
different sources of ricin, both polyclonal goat anti-ricin antisera and monoclonal mouse
antibody (mD9) inhibited all of these, rescuing mice from 5 LD50 of toxin when given
via i.p. an hour later.
Castor plant, cultivars, ricin, extraction methods, polyclonal,
monoclonal, antibodies, rescue, generic therapy.
Defence Research and Development Canada (DRDC), Suffield Research Centre, P.O. Box 4000, Station Main, Medicine Hat, Alberta, Canada, T1A 8K6, USA.