Abstract
The biological properties ofTreponema hyodysenteriae hemolysin (TH), which in some aspects resembles streptolysin S, were studied. Aside from different erythrocyte species, TH had no lytic activity on prokaryotic (protoplasts and spheroplasts) and eukaryotic (Chinese hamster ovary and spleen) cells. However, TH decreased the response of spleen cells to concanavalin A and lipopolysaccharide. In vivo, TH was found to induce fluid accumulation in ligated rat ileal loops as well as histological modifications similar to those observed in the swine dysentery. These results further differentiate TH from streptolysin S, and suggest that it is a new oxygen-resistant hemolysin produced by a Gram-negative bacterium.
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