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Infection and Immunity, August 2003, p. 4250-4259, Vol. 71, No. 8
0019-9567/03/$08.00+0     DOI: 10.1128/IAI.71.8.4250-4259.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Critical Role of Multidrug Efflux Pump CmeABC in Bile Resistance and In Vivo Colonization of Campylobacter jejuni

Jun Lin,{dagger} Orhan Sahin,{ddagger} Linda Overbye Michel, and Qijing Zhang*

Food Animal Health Research Program, Ohio Agricultural Research and Development Center, Department of Veterinary Preventive Medicine, The Ohio State University, Wooster, Ohio 44691

Received 7 February 2003/ Returned for modification 8 April 2003/ Accepted 12 May 2003

CmeABC functions as a multidrug efflux pump contributing to the resistance of Campylobacter to a broad range of antimicrobials. In this study, we examined the role of CmeABC in bile resistance and its contribution to the adaptation of Campylobacter jejuni in the intestinal tract of the chicken, a natural host and a major reservoir for Campylobacter. Inactivation of cmeABC drastically decreased the resistance of Campylobacter to various bile salts. Addition of choleate (2 mM) in culture medium impaired the in vitro growth of the cmeABC mutants but had no effect on the growth of the wild-type strain. Bile concentration varied in the duodenum, jejunum, and cecum of chicken intestine, and the inhibitory effect of the intestinal extracts on the in vitro growth of Campylobacter was well correlated with the total bile concentration in the individual sections of chicken intestine. When inoculated into chickens, the wild-type strain colonized the birds as early as day 2 postinoculation with a density as high as 107 CFU/g of feces. In contrast, the cmeABC mutants failed to colonize any of the inoculated chickens throughout the study. The minimum infective dose for the cmeABC mutant was at least 2.6 x 104-fold higher than that of the wild-type strain. Complementation of the cmeABC mutants with a wild-type cmeABC allele in trans fully restored the in vitro growth in bile-containing media and the in vivo colonization to the levels of the wild-type strain. Immunoblotting analysis indicated that CmeABC is expressed and immunogenic in chickens experimentally infected with C. jejuni. Together, these findings provide compelling evidence that CmeABC, by mediating resistance to bile salts in the intestinal tract, is required for successful colonization of C. jejuni in chickens. Inhibition of CmeABC function may not only control antibiotic resistance but also prevent the in vivo colonization of pathogenic Campylobacter.

* Corresponding author. Present address: Department of Veterinary Microbiology and Preventive Medicine, 1116 Veterinary Medicine Building, Iowa State University, Ames, IA 50011. Phone: (515) 294-2038. Fax: (515) 294-8500. E-mail: zhang123{at}iastate.edu.

Editor: D. L. Burns

{dagger} Present address: Department of Veterinary Microbiology and Preventive Medicine, Iowa State University, Ames, IA 50011.

{ddagger} Permanent address: Department of Microbiology, Veterinary Faculty, Mustafa Kemal University, Hatay, Turkey.

Infection and Immunity, August 2003, p. 4250-4259, Vol. 71, No. 8
0019-9567/03/$08.00+0     DOI: 10.1128/IAI.71.8.4250-4259.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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