Evaluation of (99m)Tc-HYNIC-βAla-Bombesin(7-14) as an agent for pancreas tumor detection in mice

Braz J Med Biol Res. 2015 Oct;48(10):923-8. doi: 10.1590/1414-431X20154506. Epub 2015 May 19.

Abstract

Pancreatic adenocarcinoma is important in oncology because of its high mortality rate. Deaths may be avoided if an early diagnosis could be achieved. Several types of tumors overexpress gastrin-releasing peptide receptors (GRPr), including pancreatic cancer cells. Thus, a radiolabeled peptide derivative of gastrin-releasing peptide (GRP) may be useful as a specific imaging probe. The purpose of the present study was to evaluate the feasibility of using (99m)Tc-HYNIC-βAla-Bombesin(7-14)as an imaging probe for Capan-1 pancreatic adenocarcinoma. Xenographic pancreatic tumor was developed in nude mice and characterized by histopathological analysis. Biodistribution studies and scintigraphic images were carried out in tumor-bearing nude mice. The two methods showed higher uptake by pancreatic tumor when compared to muscle (used as control), and the tumor-to-muscle ratio indicated that (99m)Tc-HYNIC-βAla-Bombesin (7-14)uptake was four-fold higher in tumor cells than in other tissues. Scintigraphic images also showed a clear signal at the tumor site. The present data indicate that (99m)Tc-HYNIC-βAla-Bombesin (7-14) may be useful for the detection of pancreatic adenocarcinoma.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenocarcinoma / diagnostic imaging*
  • Adenocarcinoma / pathology
  • Animals
  • Bombesin / analogs & derivatives*
  • Bombesin / pharmacokinetics
  • Cell Line, Tumor
  • Gastrin-Releasing Peptide / analogs & derivatives
  • Heterografts / diagnostic imaging
  • Heterografts / pathology
  • Humans
  • Male
  • Mice, Nude
  • Muscles / diagnostic imaging
  • Organotechnetium Compounds / pharmacokinetics*
  • Pancreatic Neoplasms / diagnostic imaging*
  • Pancreatic Neoplasms / pathology
  • Peptide Fragments / pharmacokinetics
  • Radionuclide Imaging

Substances

  • Organotechnetium Compounds
  • Peptide Fragments
  • technetium 99m HYNIC-beta-Ala-bombesin(7-14)
  • Gastrin-Releasing Peptide
  • Bombesin