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Title: Bacterial infection imaging with [ 18F]fluoropropyl-trimethoprim

There is often overlap in the diagnostic features of common pathologic processes such as infection, sterile inflammation, and cancer both clinically and using conventional imaging techniques. Here in this paper, we report the development of a positron emission tomography probe for live bacterial infection based on the small-molecule antibiotic trimethoprim (TMP). [ 18F]fluoropropyl-trimethoprim, or [ 18F]FPTMP, shows a greater than 100-fold increased uptake in vitro in live bacteria (Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa) relative to controls. In a rodent myositis model, [ 18F]FPTMP identified live bacterial infection without demonstrating confounding increased signal in the same animal from other etiologies including chemical inflammation (turpentine) and cancer (breast carcinoma). Additionally, the biodistribution of [ 18F]FPTMP in a nonhuman primate shows low background in many important tissues that may be sites of infection such as the lungs and soft tissues. In conclusion, these results suggest that [ 18F]FPTMP could be a broadly useful agent for the sensitive and specific imaging of bacterial infection with strong translational potential.
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States). Department of Radiology
Publication Date:
Grant/Contract Number:
SC0012476; SE0012476
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 114; Journal Issue: 31; Journal ID: ISSN 0027-8424
National Academy of Sciences, Washington, DC (United States)
Research Org:
Trustees of the University of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Org:
Country of Publication:
United States
47 OTHER INSTRUMENTATION; 59 BASIC BIOLOGICAL SCIENCES; bacteria; imaging; PET; trimethoprim; radiotracer
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1465942