1887

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Volume 17, Issue 3

Comparative study of the nature and biological activities of bacterial enterotoxins Free

Abstract

SUMMARY

It is apparent that there are considerable similarities between many of the enterotoxins produced by enteric pathogens. Although the effect of most of these toxins is restricted to the intestine , many cells are also sensitive to intoxication . The resultant in-vitro biochemical changes may have no pathological significance but serve to underline the central role of cyclic nucleotides in cellular fluid regulation. The biological activity of these enterotoxins is the result of interaction with membrane-bound adenylate cyclase, leading to persistent elevation of intracellular levels of cAMP. Stimulation of adenylate cyclase occurs consistently after a characteristic lag phase which varies somewhat between toxins. The duration and degree of stimulation of adenylate cyclase by the various toxins may point to possible differences in affinity, dissociation and mechanism of activation of the cyclase molecule. Subtle events at, or within, the cell membrane must occur during intoxication and may include complex associations of toxin with membrane lipid and protein components.

The heat-labile toxins of spp., and have much in common in their structures, membrane receptors and biochemical modes of action. Similarly the heat-stable toxins of and , match each other in their biological activities. Classified along with the enterotoxin of C. , the enterotoxin produced by (and possibly some strains of ) appears to differ from the other enterotoxins by acting on protein biosynthesis primarily and not on the nucleotide cyclase activation systems. In another category must be placed the various enterotoxins produced by until more is known. Surprisingly little research has been directed towards the elucidation of their mode of action, although much is known of their serological and structural differences. Evidence to date suggests that staphylococcal enterotoxins differ from the other diarrhoeagenic agents discussed in this review.

The structural and immunological similarities between the various heat-labile enterotoxins suggest a common genetic origin with gene transfer between the different bacterial species being responsible for the spread of enterotoxigenicity. It is possible that many of the “newer” enterotoxins owe their origin to genetic recombination with the “older” enteropathogens like .

  • Received:
  • Accepted:
  • Published Online:
© J. MED. MICROBIOL. 1984
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1984-06-01
2024-04-25
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Comparative study of the nature and biological activities of bacterial enterotoxins
J. Med. Microbiol. 17, 217 (1984); https://doi.org/10.1099/00222615-17-3-217
/content/journal/jmm/10.1099/00222615-17-3-217
/content/journal/jmm/10.1099/00222615-17-3-217
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