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In Vivo Microbial Targeting of 99mTc-Labeled Human β-Defensin-3 in a Rat Model of Infection

Giulia Anna Follacchio1,2, Alessandro Pala1, Sergio Scaccianoce3

  • 1From the Nuclear Medicine Unit, Department of Radiology, Oncology, and Human Pathology.

Clinical Nuclear Medicine
|July 16, 2019
PubMed
Abstract

Insights

Technetium-labeled human beta-defensin 3 (Tc-HBD-3) shows promising uptake in infection sites. This novel radiotracer may help differentiate infection from sterile inflammation in vivo.

Area of Science:

  • Nuclear medicine
  • Infectious disease imaging
  • Radiopharmaceutical development

Background:

  • Differentiating infection from aseptic inflammation is clinically challenging.
  • Current imaging agents have limitations, including false-positive rates.
  • Antimicrobial peptides like human beta-defensin 3 (HBD-3) show potential for targeted imaging.

Purpose of the Study:

  • To evaluate the in vivo uptake of Tc-HBD-3 in a rat model.
  • To assess Tc-HBD-3's ability to distinguish infection from sterile inflammation.

Main Methods:

  • Recombinant HBD-3 was radiolabeled with Technetium-99m (Tc).
  • Tc-HBD-3's radiolabeling yield, specific activity, and biological activity were assessed.
  • Infection and aseptic inflammation models were established in rats.
  • Serial scintigraphic imaging was performed after Tc-HBD-3 administration.

Main Results:

  • Tc-HBD-3 demonstrated a radiolabeling yield of 70% and specific activity of 6-8 MBq/μg.
  • Significant and progressive Tc-HBD-3 uptake was observed at the site of Staphylococcus aureus infection.
  • The target-to-nontarget ratio in the infection site was 5.7-fold higher than in the inflammation site at 140 minutes.

Conclusions:

  • Tc-HBD-3 imaging in a rat model showed preferential uptake at infection sites.
  • These findings suggest Tc-HBD-3's potential as a novel agent for specific infection imaging.
  • Further studies are warranted to validate Tc-HBD-3 for clinical use in differentiating infection from inflammation.

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