title: 18F-Fluorodeoxyglycosylamines: Maillard reaction of 18F-fluorodeoxyglucose with biological amines.
abstract: The Maillard reaction of sugars and amines resulting in the formation of glycosylamines and Amadori products is of biological significance, for drug delivery, role in central nervous system, and other potential applications. We have examined the interaction of (18) F-fluorodeoxyglucose ((18) F-FDG) with biological amines to study the formation of (18) F-fluorodeoxyglycosylamines ((18) F-FDGly). Respective amines N-allyl-2-aminomethylpyrrolidine (NAP) and 2-(4'-aminophenyl)-6-hydroxybenzothiazole (PIB precursor) were mixed with FDG to provide glycosylamines, FDGNAP and FDGBTA. Radiosynthesis using (18) F-FDG (2-5 mCi) was carried out to provide (18) F-FDGNAP and (18) F-FDGBTA. Binding of FDGBTA and (18) F-FDGBTA was evaluated in human brain sections of Alzheimer's disease (AD) patients and control subjects using autoradiography. Both FDGNAP and FDGBTA were isolated as stable products. Kinetics of (18) F-FDGNAP reaction indicated a significant product at 4 h (63% radiochemical yield). (18) F-FDGBTA was prepared in 57% yield. Preliminary studies of FDGBTA showed displacement of (3) H-PIB (reduced by 80%), and (18) F-FDGBTA indicated selective binding to Aβ-amyloid plaques present in postmortem AD human brain, with a gray matter ratio of 3 between the AD patients and control subjects. We have demonstrated that (18) F-FDG couples with amines under mild conditions to form (18) F-FDGly in a manner similar to click chemistry. Although these amine derivatives are stable in vitro, stability in vivo and selective binding is under investigation.
authors: Preclinical Imaging, Department of Radiological Sciences, University of California - Irvine, Irvine, CA, 92697, USA.
authors: Aparna
authors: A
authors: Baranwal
authors: Himika H
authors: HH
authors: Patel
authors: Jogeshwar
authors: J
authors: Mukherjee
mesh_terms: D000544:Alzheimer Disease / Q000000981:diagnostic imaging; D016229:Amyloid beta-Peptides / Q000378:metabolism; D052160:Benzothiazoles / Q000737:chemistry*; D001679:Biogenic Amines / Q000138:chemical synthesis* / Q000494:pharmacology; D016022:Case-Control Studies; D019788:Fluorodeoxyglucose F18 / Q000737:chemistry*; D006801:Humans; D015416:Maillard Reaction; D011485:Protein Binding; D011759:Pyrrolidines / Q000737:chemistry*; D011877:Radionuclide Imaging
chemical_list: D016229:Amyloid beta-Peptides; D052160:Benzothiazoles; D001679:Biogenic Amines; D011759:Pyrrolidines; D019788:Fluorodeoxyglucose F18
keywords: 18F-FDG; Maillard reaction; quasi-Amadori product