Current address: Centro Nacional de Biologia Celular y Retrovirus, Servicio de Inmunología, Majadahonda, 28220 Madrid, Spain.
Enterotoxin and cytotoxin production by Salmonella enteritidis strains isolated from gastroenteritis outbreaks
Article first published online: 11 MAR 2008
Journal of Applied Microbiology
Volume 82, Issue 1, pages 19–31, January 1997
How to Cite
Rumeu, M.T., Suárez, M.A., Morales, S. and Rotger, R. (1997), Enterotoxin and cytotoxin production by Salmonella enteritidis strains isolated from gastroenteritis outbreaks. Journal of Applied Microbiology, 82: 19–31. doi: 10.1111/j.1365-2672.1997.tb03293.x
- Issue published online: 11 MAR 2008
- Article first published online: 11 MAR 2008
- 5706/04/96: received 1 April 1996, revised 28 May 1996 and accepted 29 May 1996
Seventy-six Salmonella enteritidis, three Salmonella virchow and one Salmonella braedenrup strains were screened for enterotoxigenicity by using the Chinese hamster ovary (CHO), Y1 adrenal, Vero and HeLa cell tests. All the strains gave positive reactions for enterotoxin production, except one, and the relative sensitivity to the toxin exhibited by the different cell lines was evaluated. An enterotoxic activity has been identified in sonicated extracts of Salm. enteritidis: This enterotoxin was purified on Agarose A-5m (Bio-Rad) and Superose 12 HR 10/30 column. The enterotoxic activity was eluted from the Superose column in the first peak. Like Vibrio cholerae toxin CT and Escherichia coli enterotoxin LT, it was blocked by GM1 ganglioside, but at a higher concentration. In addition, a cytotoxic factor has been partially identified. The procedure for isolating the cytotoxin included ammonium sulphate precipitation, size-exclusion chromatography and anion exchange chromatography. This cytotoxin factor caused inhibition of protein synthesis in cultured cells, as determined by flow cytometry and [3H]-leucine incorporation. Flow cytometry analysis also showed an activation of CHO cells when exposed to this cytotoxic factor resulting in a state of active growth. Cytotoxic activity was not blocked by gangliosides.