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Antimicrobial Agents and Chemotherapy, April 2003, p. 1301-1307, Vol. 47, No. 4
0066-4804/03/$08.00+0     DOI: 10.1128/AAC.47.4.1301-1307.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Use of Genetically Engineered Phage To Deliver Antimicrobial Agents to Bacteria: an Alternative Therapy for Treatment of Bacterial Infections

Caroline Westwater,* Laura M. Kasman, David A. Schofield, Phillip A. Werner, Joseph W. Dolan, Michael G. Schmidt, and James S. Norris

Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, South Carolina 29403

Received 6 September 2002/ Returned for modification 4 November 2002/ Accepted 27 December 2002

The emergence and increasing prevalence of multidrug-resistant bacterial pathogens emphasizes the need for new and innovative antimicrobial strategies. Lytic phages, which kill their host following amplification and release of progeny phage into the environment, may offer an alternative strategy for combating bacterial infections. In this study, however, we describe the use of a nonlytic phage to specifically target and deliver DNA encoding bactericidal proteins to bacteria. To test the concept of using phage as a lethal-agent delivery vehicle, we used the M13 phagemid system and the addiction toxins Gef and ChpBK. Phage delivery of lethal-agent phagemids reduced target bacterial numbers by several orders of magnitude in vitro and in a bacteremic mouse model of infection. Given the powerful genetic engineering tools available and the present knowledge in phage biology, this technology may have potential use in antimicrobial therapies and DNA vaccine development.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Medical University of South Carolina, BSB-201, 173 Ashley Avenue, Charleston, SC 29403. Phone: (843) 792-7703. Fax: (843) 792-2464. E-mail: westwatc{at}musc.edu.

Antimicrobial Agents and Chemotherapy, April 2003, p. 1301-1307, Vol. 47, No. 4
0066-4804/03/$08.00+0     DOI: 10.1128/AAC.47.4.1301-1307.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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