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. 1992 Nov;60(11):4468–4474. doi: 10.1128/iai.60.11.4468-4474.1992

Some properties of purified Escherichia coli heat-stable enterotoxin II.

S Hitotsubashi 1, Y Fujii 1, H Yamanaka 1, K Okamoto 1
PMCID: PMC258190  PMID: 1398961

Abstract

We examined the biological properties of purified Escherichia coli heat-stable enterotoxin II (STII) using mouse intestinal loop assays and compared these properties with those of heat-stable enterotoxin I (STI) and cholera toxin (CT). The action of STII over time differed from those of STI and CT. STII did not alter cyclic GMP or cyclic AMP levels in intestinal mucosal cells. Our results supported the idea that the mechanism of action of STII in inducing fluid secretion is different from the mechanisms of action of STI and CT. This hypothesis was further supported by the fact that an anti-STII neutralizing serum did not neutralize the activities of STI and CT. Subsequently, we examined the involvement of prostaglandins in the action of STII. The level of prostaglandin E2 in the fluid accumulated as a result of the action of STII increased, and the prostaglandin synthesis inhibitors aspirin and indomethacin significantly reduced the response to STII. These results implicate prostaglandin E2 in the mechanism of action of STII.

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Selected References

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