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. 1990 Jun;28(6):1314–1320. doi: 10.1128/jcm.28.6.1314-1320.1990

Isolation, characterization, and host-cell-binding properties of a cytotoxin from Campylobacter jejuni.

S Mahajan 1, F G Rodgers 1
PMCID: PMC267926  PMID: 2199497

Abstract

A 68,000-molecular-weight protein was isolated by polyacrylamide gel electrophoresis from the organism-free filtrate of a fully virulent clinical strain of Campylobacter jejuni. The eluted protein was heat labile, was inactivated at either pH 3.0 or 9.0, was sensitive to trypsin, and was lethal for fertile chicken eggs. It also had toxic effects on chicken embryo fibroblast, Chinese hamster ovary (CHO), and intestinal 407 (Int407) cells. A monoclonal antibody (CETPMAb4) raised to this eluted toxic protein (ETP) from C. jejuni abolished these toxic activities. Homology between C. jejuni ETP and Vibrio cholerae toxin was not observed in that specific antisera to each did not block their respective toxic activities. In enzyme-linked immunosorbent assays, ETP, unlike chlorea enterotoxin, did not bind to GM1 ganglioside. Furthermore, the C. jejuni toxin had cytotoxinlike properties and induced rounding of CHO cells. Binding of ETP to Int407 and primary chicken embryo fibroblast cells was maximal after 2 h as assessed by enzyme-linked immunosorbent assay, and this toxin adherence to host cell membranes was significantly reduced by prior treatment of the cells with proteolytic enzymes, neuraminidase, or glutaraldehyde but not by treatment with beta-galactosidase, lipase, Nonidet P-40, or sodium metaperiodate. In competitive binding assays, sugars, lectins, or GM1 ganglioside did not adversely influence uptake of ETP by these cells. These results suggest that the ETP produced by C. jejuni is a cytotoxin which binds to Int407 cells via a protein- or glycoproteinlike receptor on cell membranes and possesses properties dissimilar to those of V. cholerae toxin.

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Selected References

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