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 using99mTc-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 that99mTc-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 that99mTc-HYNIC-βAla-Bombesin(7-14)may be useful for the detection of pancreatic adenocarcinoma.
Subject(s)
Animals , Humans , Male , Adenocarcinoma , Bombesin/analogs & derivatives , Organotechnetium Compounds/pharmacokinetics , Pancreatic Neoplasms , Adenocarcinoma/pathology , Bombesin/pharmacokinetics , Cell Line, Tumor , Gastrin-Releasing Peptide/analogs & derivatives , Heterografts/pathology , Heterografts , Mice, Nude , Muscles , Pancreatic Neoplasms/pathology , Peptide Fragments/pharmacokineticsABSTRACT
Annona muricata Linn has been reported to contain valuable bioactive compounds known as Annonaceous acetogenins.Theselong chain fatty acids were widely discussed for its potential in promoting anticancer and antiproliferative activity in various cancer cell lines. However, little study has been done on A. muricata effect in pancreatic cancer cells. In this study, the viability of Capan-1 after treatment with A. muricata extracts was determined by using 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay. The results displayed that only hexane and commercialized extract inhibited cell proliferation in a concentration-dependent manner with IC25 varied ~7.8-8μg/ml and ~0.9-1.0μg/ml respectively. The data demonstrate that A. muricata hexane and commercialized extracts induced mild cytotoxicity in pancreatic cancer cells (Capan-1).