[(18)F]N-(4'-fluorobenzyl)-4-(3-bromophenyl) acetamide for imaging the sigma receptor status of tumors: comparison with [(18)F]FDG, and [(125)I]IUDR

A series of biodistribution studies were conducted with the radiotracer, [(18)F]N-(4'-fluorobenzyl)-4-(3-bromophenyl)acetamide, [(18)F]1 in nude mice bearing tumor xenografts of the mouse mammary adenocarcinoma, line 66. This radiotracer has a high affinity for both sigma(1) and sigma(2) recept...

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Bibliographic Details
Published in:Nuclear medicine and biology 2001-05, Vol.28 (4), p.451-458
Main Authors: Mach, R H, Huang, Y, Buchheimer, N, Kuhner, R, Wu, L, Morton, T E, Wang, L, Ehrenkaufer, R L, Wallen, C A, Wheeler, K T
Format: Article
Language:English
Subjects:
Acetamides - chemical synthesis
Adenocarcinoma - diagnostic imaging
Animals
Female
Fluorodeoxyglucose F18
Idoxuridine
Mammary Neoplasms, Experimental - diagnostic imaging
Mice
Mice, Nude
Neoplasms - diagnostic imaging
Neoplasms - metabolism
Radionuclide Imaging
Radiopharmaceuticals
Receptors, sigma - antagonists & inhibitors
Receptors, sigma - metabolism
Tissue Distribution
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Summary:A series of biodistribution studies were conducted with the radiotracer, [(18)F]N-(4'-fluorobenzyl)-4-(3-bromophenyl)acetamide, [(18)F]1 in nude mice bearing tumor xenografts of the mouse mammary adenocarcinoma, line 66. This radiotracer has a high affinity for both sigma(1) and sigma(2) receptors. In vivo studies were also conducted in order to assess the effect of blocking sigma(1) receptors on tumor uptake and the tumor:background ratio of this radiotracer. The results of these studies revealed that blocking the sigma(1) receptor so that only the sigma(2) receptors are labeled in vivo, results in a higher tumor:background ratio with only a small reduction in the tumor uptake of the radiotracer relative to the no-carrier-added (i.e., nonselective) conditions. Comparative in vivo studies were also conducted with the anatomic and metabolic imaging agent, [(18)F]FDG, and a radiolabeled DNA precursor, [(125)I]IUdR. Both of these radiolabeled compounds represent classes of agents that have been proposed for imaging the proliferative status of solid tumors. The results of these studies indicated that a sigma(2)-selective imaging agent may be, 1) a better anatomic imaging agent for breast cancer than [(18)F]FDG, and 2) a better functional imaging agent than the radiolabeled DNA precursors, [(123/124)I]IUdR and [(11)C]thymidine, for measuring the proliferative status of breast tumors with PET and SPECT. However, additional studies will be needed to compare sigma(2)-selective imaging agents with [(18)F]FLT in order to determine which is the more appropriate imaging agent for measuring the proliferative status of breast tumors with PET.
ISSN:0969-8051