Journal
JOURNAL OF INFECTIOUS DISEASES
Volume 195, Issue 4, Pages 572-580Publisher
OXFORD UNIV PRESS INC
DOI: 10.1086/510856
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Introduction. To better define the contribution of edema toxins (ETx) and lethal toxins (LeTx) to shock with Bacillus anthracis, recombinant preparations of each were investigated alone or together in rats. Methods and results. Lethal dose ranges (0%-100% lethality) of ETx (200-800 mu g/kg as a 24-h infusion) were higher than those of LeTx (12.5-200 mu g/ kg) (p < .0001). However, compared with LeTx, similarly lethal ETx doses produced earlier and greater reductions in mean blood pressure (MBP) and increased, rather than decreased, heart rate (HR) (P < .05 for all). Combining either similar weight or lethal doses of ETx and LeTx increased the hazard ratio for death (log +/- standard error) similar to the sum calculated with the toxin's effects alone (2.6 +/- 1.1 observed 2.9 vs. 1.0 calculated for similar weight and 3.1 +/- 1.0 vs. 3.9 +/- 1.5 for similar lethal doses; P = .5 for both). Early (<= 10 h) and late during infusion, ETx and LeTx together also altered MBP and HR in patterns consistent with the sum of their individual effects. Conclusions. ETx was similar to 10 times less lethal than LeTx but produced greater hypotension and added to the latter's harmful effects. These findings suggest that it may be appropriate for antitoxin therapies for B. anthracis to target both ETx and LeTx.
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