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 de...

Melanoma is a deadly disease at late metastatic stage, and early diagnosis and accurate staging remain the key aspects for managing melanoma. The melanocortin 1 receptor (MC1 R) is overexpressed in primary and metastatic melanomas, and its endogenous ligand, the α-melanocyte-stimulating hormone (αMSH), has been extensively studied for the development of MC1 R-targeted molecular imaging and ther...

Fibronectin-releasing activity has recently been found in concentrated serum-free culture media of the established human fibrosarcoma cell line, 8387. We used these M.W. 10,000 fibronectin-releasing polypeptides (10K peptides) to study their effects on the cell-free matrices of cultured diploid human lung fibroblasts. Metabolically labeled cultures of fibroblasts were extracted with sodium deox...

UNLABELLED The gastrin-releasing peptide receptor (GRPR) is overexpressed in human prostate cancer. Bombesin (BBN) is a neurotransmitter of 14 amino acids and binds with selectivity and with high affinity to GRPRs. We have synthesized a NOTA-conjugated bombesin derivative, NOTA-8-Aoc-BBN(7-14)NH(2), to label this analog with (18)F using the new Al(18)F method. In this study, the GRPR-targeting ...

Radioimmunotherapy (RIT or RAIT) dates back more than 2 decades and has evolved to encompass a variety of tumorseeking antibodies in various forms, with different radionuclides, different delivery methods, for different clinical indications (usually advanced disease).1 Although selective antibody targeting has been demonstrated, the radiation doses delivered have been insufficient to markedly i...

The major integral plasma membrane protein (IP39) of Euglena gracilis was radiolabeled, peptide mapped, and dissected with proteases to identify cytoplasmic domains that bind and anchor proteins of the cell surface. When plasma membranes were radioiodinated and extracted with octyl glucoside, 98% of the extracted label was found in IP39 or the 68- and 110-kD oligomers of IP39. The octyl glucosi...

The results in Figure la were obtained with a column that had already been used in >300 protein and peptide purifications. When we replaced this with a new column from the same manufacturer, there was a dramatic decrease in recovery of the labeled peptide (Figure lb), as shown by the absence of the 1-34 PTHrP peak at 29 mm. Such behavior might be caused by strong or irreversible binding of pept...

INTRODUCTION Visualization of tumor angiogenesis using radionuclide targeting provides important diagnostic information. In previous study, we proved that an arginine-arginine-leucine (RRL) peptide should be a tumor endothelial cell specific binding sequence. The overall aim of this study was to evaluate whether (99m)Tc-radiolabeled RRL could be noninvasively used for imaging of malignant tumor...