Introduction: Over expression of selected peptide receptors in human tumors has been shown to represent clinically relevant targets for cancer diagnosis and therapy. The aim of this work was to investigate Neuropeptide Y (NPY) as a new radiopharmaceutical for diagnosis of breast cancer. Methods: A neuropeptide Y analogues with Y1 receptor preference and agonistic p...

introduction: bombesin is a 14-aminoacid peptide isolated from frog skin. the mammalian counterparts of the frog peptide are neuromedin b (nmb) and gastrin-releasing peptide (grp). bombesin (bbn) is a peptide showing high affinity for the gastrin releasing peptide receptor (grpr). prostate, small cell lung cancer, breast, gastric, and colon cancers are known to over express receptors to bombesi...

neurokinin 1 receptors (nk1r) are overexpressed on several types of important human cancer cells. substance p (sp) is the most specific endogenous ligand known for nk1rs. accordingly, a new sp analogue was synthesized and evaluated for detection of nk1r positive tumors. [6-hydrazinopyridine-3-carboxylic acid (hynic)-tyr8-met(o)11-sp] was synthesized and radiolabeled with 99mtc using ethylenedia...

Melanocortin-1 (MC1) receptor is an attractive melanoma-specific target for the development of α-MSH peptide based imaging and therapeutic agents. In this work a new lactam bridge α-MSH analogue was synthesized and radiolabeled with 99mTc via HYNIC chelator and tricine as co-ligand. Also, stability in human serum, receptor bound internalization and tissue biodistribution in tumor bearing nude m...

introduction: somatostatin receptors expressed on a wide range of human tumors, are potential targets for the peptide receptor radionuclide therapy (prrt). in this study, 177lu-[dota-dphe1, tyr3]octreotide (177lu-dotatoc) as an agent for prrt was prepared and its biodistribution was studied in rats. methods:the best condition for the preparation of the 177lu-dotatoc radiolabeled complex was det...

Melanocortin-1 (MC1) receptor is an attractive melanoma-specific target for the development of α-MSH peptide based imaging and therapeutic agents. In this work a new lactam bridge α-MSH analogue was synthesized and radiolabeled with 99mTc via HYNIC chelator and tricine as co-ligand. Also, stability in human serum, receptor bound internalization and tissue biodistribution in tumor bearing nude m...

Radioimmunotherapy is hindered by a variety of factors linked to the utilization of monoclonal antibodies. These limitations include restricted tumor penetration as well as low levels of intratumoral antigen expression. To address the latter problem, we used a gene therapy approach to induce tumor cells to express enhanced levels of receptor with high binding affinity for a radiolabeled peptide...

Background: Bombesin shows high affinity for Gastrin-releasing peptide (GRP) receptors which over expressed on the cell surfaces of several human tumors particularly in prostate and breast cancers. The aim of this study was labeling of designed analogue with99mTc via HYNIC and Tricine /EDDA and evaluation as potential targeted tumor scintigraphic agent. Materials and Methods: HYNIC-Bombesin wa...

melanocortin-1 (mc1) receptor is an attractive melanoma-specific target for the development of α-msh peptide based imaging and therapeutic agents. in this work a new lactam bridge α-msh analogue was synthesized and radiolabeled with 99mtc via hynic chelator and tricine as co-ligand. also, stability in human serum, receptor bound internalization and tissue biodistribution in tumor bearing nude m...