HOMEPRODUCTSCOMPANYCONTACTFAQResearchDictionaryPharmaSign Up FREE or Login

Inflammation and infection imaging with a 99mTc-neutrophil elastase inhibitor in monkeys.

AbstractUNLABELLED:
A radiolabeled human neutrophil elastase inhibitor (EPI-HNE-2) may represent an improved nuclear medicine imaging agent for inflammation and infection. This peptide displays rapid pharmacokinetics due to its low molecular weight and localizes specifically on neutrophil elastase released in inflammatory sites by activated neutrophils.
METHODS:
In this investigation, the peptide was radiolabeled with 99mTc using N-hydroxysuccinimidyl S-acetylmercaptoacetyltriglycline (NHS-MAG3) as a bifunctional chelator and was administered on 18 occasions to 5 rhesus monkeys with inflammation/infection.
RESULTS:
Plasma clearance was rapid, with liver and kidneys representing the major organs of accumulation. No evidence of toxicity, dosage effects, or circulating antiMAG3-EPI-HNE-2 antibodies was observed. Specificity of localization was established using radiolabeled bovine pancreatic trypsin inhibitor (a non-hNE-binding peptide of similar size) as a nonspecific negative control peptide and by predosing with unlabeled EPI-HNE-2 to block receptor sites before the administration of radiolabeled EPI-HNE-2. The ability of radiolabeled EPI-HNE-2 to image inflammation/infection was evaluated in 12 studies in monkeys receiving only radiolabeled EPI-HNE-2 and with lesions in the arm, shoulder, or lower back. Positive images were obtained in all studies, uptake was apparent almost immediately, and images were still positive 24 h later. As a positive control, animals also received nonspecific IgG antibody radiolabeled with 99mTc either directly or by NHS-MAG3. Compared with labeled antibody, plasma clearance of 99mTc was faster with labeled EPI-HNE-2 and accumulation in liver and heart was lower. Uptake of radioactivity in the inflammation was higher during the first hour with EPI-HNE-2 versus antibody but lower thereafter.
CONCLUSION:
When radiolabeled with 99mTc, EPI-HNE-2 localized specifically in inflammations in a monkey model and provided early images of diagnostic quality.
AuthorsM Rusckowski, T Qu, J Pullman, R Marcel, A C Ley, R C Ladner, D J Hnatowich
JournalJournal of nuclear medicine : official publication, Society of Nuclear Medicine (J Nucl Med) Vol. 41 Issue 2 Pg. 363-74 (Feb 2000) ISSN: 0161-5505 [Print] United States
PMID10688123 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)
Chemical References
  • Radiopharmaceuticals
  • Serpins
  • Technetium Tc 99m Mertiatide
  • Leukocyte Elastase
Topics
  • Animals
  • Cattle
  • Humans
  • Leukocyte Elastase (antagonists & inhibitors)
  • Macaca mulatta
  • Radioimmunodetection
  • Radiopharmaceuticals
  • Serpins
  • Staphylococcal Infections (diagnostic imaging)
  • Technetium Tc 99m Mertiatide
  • Tissue Distribution

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research graph!


Choose Username:
Email:
Password:
Verify Password:
Enter Code Shown: