Related Experiment Video
Updated: Sep 3, 2026
Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
Radiolabelled antimicrobial peptides for infection detection
Antonella Lupetti1, Mick M Welling, Ernest K J Pauwels
1Department of Infectious Diseases, Leiden University Medical Center, Leiden, The Netherlands.
Abstract:
It can be difficult to establish whether a febrile episode in a patient is suggestive of an infectious or non-infectious cause. Besides clinical history, physical examination, and laboratory assays, scintigraphic imaging of bacterial and fungal infections using antimicrobial peptides labelled with technetium-99m (99mTc) can be useful. Key to this latter approach is that some of these peptides accumulate at sites of infection but not in sterile inflammatory lesions, because of their preferential binding to bacteria and fungi over mammalian cells. Here we report on imaging of infections with these peptides in laboratory animals. On the basis of their favourable binding characteristics, fast and easy penetration into the infected area, and rapid clearance from the circulation (half-life approximately 30 min) via the kidneys, several 99mTc-antimicrobial peptides have been selected that distinguish infectious foci from sites of sterile inflammation. Accumulation of 99mTc-antimicrobial peptides at sites of experimental infection correlated well with the number of viable bacteria/yeasts present. This finding allowed us to monitor with 99mTc-antimicrobial peptides the efficacy of antimicrobial therapy in animals with experimental infections. In conclusion, non-microbicidal amounts of 99mTc-antimicrobial peptides are promising candidates for the scintigraphic imaging of bacterial/fungal infections and for monitoring the efficacy of antimicrobial therapy in patients.
Insights
Technetium-99m-labeled antimicrobial peptides offer a new way to image bacterial and fungal infections. These peptides can distinguish infections from sterile inflammation and monitor treatment effectiveness in animal models.
Area of Science:
- Nuclear Medicine
- Infectious Diseases
- Biomedical Imaging
Background:
- Differentiating infectious from non-infectious febrile episodes is clinically challenging.
- Scintigraphic imaging using radiolabeled antimicrobial peptides presents a potential diagnostic tool.
Purpose of the Study:
- To evaluate technetium-99m (99mTc)-labeled antimicrobial peptides for scintigraphic imaging of infections.
- To assess the peptides' ability to differentiate infectious from sterile inflammatory sites.
- To determine if these peptides can monitor antimicrobial therapy efficacy.
Main Methods:
- Selection of 99mTc-antimicrobial peptides based on binding characteristics and clearance rates.
- Imaging of experimental infections in laboratory animals using selected peptides.
- Correlation of peptide accumulation with viable microbial load.
- Monitoring of antimicrobial therapy efficacy in infected animal models.
Main Results:
- Selected 99mTc-antimicrobial peptides demonstrated favorable binding to bacteria and fungi, accumulating at infection sites.
- Peptides effectively distinguished infectious foci from sterile inflammatory lesions.
- Accumulation of 99mTc-antimicrobial peptides correlated with the number of viable microorganisms.
- The peptides successfully monitored the efficacy of antimicrobial therapy in experimental infections.
Conclusions:
- Non-microbicidal 99mTc-antimicrobial peptides are promising for scintigraphic imaging of bacterial and fungal infections.
- These peptides show potential for monitoring antimicrobial therapy effectiveness in patients.
- This approach could aid in diagnosing febrile episodes of unclear origin.
Related Concept Videos
03:31Labeling DNA Probes
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
01:25Rapid Identification of Pathogens