Culture filtrates of Shigella flexneri 2a strain M4243 grown in iron-depleted medium, caused significant fluid accumulation in rabbit ileal loops. Also, when tested in Ussing chambers, a greater rise in potential difference and short circuit current was seen with such filtrates compared with the medium control. Analogous filtrates from two M4243 derivatives lacking the 140-MD invasiveness plasmid (either M4243avir or BS103) retained 60-65% of the wild-type enterotoxic activity. Ultrafiltration and gel exclusion size fractionation of M4243 filtrate revealed that the activity was approximately 60 kD. SDS-PAGE performed on this fraction showed 18 bands, 5 of which reacted with human convalescent sera. Genes encoding this enterotoxin, named ShET1 for Shigella enterotoxin 1, were cloned from the S. flexneri 2a chromosome, and two separate open reading frames of 534 and 186 bp were sequenced. These observations suggest that S. flexneri 2a elaborates two distinct enterotoxins: ShET1, encoded by genes located on the chromosome, and ShET2, encoded by a gene on the 140-MD invasiveness plasmid. ShET1, which is composed of two distinct subunits and is elaborated in vivo, where it elicits an immune response, may be important in the pathogenesis of diarrheal illness due to S. flexneri 2a.
A Fasano, F R Noriega, D R Maneval Jr, S Chanasongcram, R Russell, S Guandalini, M M Levine
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