DNA homology and immunological cross-reactivity between Aeromonas hydrophila cytotonic toxin and cholera toxin.

Abstract:

:DNA colony hybridization with three 18- to 20-base-long synthetic oligonucleotide probes for cholera toxin (CT) was used to screen 12 clinical isolates of Aeromonas hydrophila. Under stringent hybridizing (overnight at 40 degrees C) and washing (1 h at 50 degrees C) conditions, nine strains reacted with the 32P-labeled CT probes. Concentrated (10x) cell-free supernatants or lysates from eight cultures, heated at 56 degrees C for 20 min, produced cytotonic effects in Y-1 mouse adrenal cells and Chinese hamster ovary (CHO) cells and caused a 1.5- to 22-fold increase in production of cyclic AMP in CHO cells. Preincubation with anti-CT reduced the CHO cell titer of cell lysates by 10-fold. In the GM1 ganglioside enzyme-linked immunosorbent assay, heated supernatants and lysates gave readings equivalent to 3.5 to 100 ng of CT. Three proteins with molecular weights of 89,900, 37,000, and 11,000 reacted with anti-CT on immunoblots of cell lysates from sodium dodecyl sulfate-polyacrylamide gels. These results suggest that there is DNA homology and immunological cross-reactivity between CT and the A. hydrophila cytotonic toxin.

journal_name

J Clin Microbiol

authors

Schultz AJ,McCardell BA

doi

10.1128/JCM.26.1.57-61.1988

subject

Has Abstract

pub_date

1988-01-01 00:00:00

pages

57-61

issue

1

eissn

0095-1137

issn

1098-660X

journal_volume

26

pub_type

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