The present invention relates to novel compounds suitable for or already radiolabeled with
18
F, methods of making such compounds and use of such compounds for diagnostic imaging. Such labeled compounds are characerized by Formula II, wherein the moieties F, R
1
, R
2
, B
1,2
, Y
1,2
, Z
1,2
and E have the meaning as defined in the specification and claims.
Studies toward the Development of New Silicon-Containing Building Blocks for the Direct <sup>18</sup>F-Labeling of Peptides
作者:Lukas O. Dialer、Svetlana V. Selivanova、Carmen J. Müller、Adrienne Müller、Timo Stellfeld、Keith Graham、Ludger M. Dinkelborg、Stefanie D. Krämer、Roger Schibli、Markus Reiher、Simon M. Ametamey
DOI:10.1021/jm400857f
日期:2013.10.10
Silicon-containing prosthetic groups have been conjugated to peptides to allow for a single-step labeling with F-18 radioisotope. The fairly lipophilic di-tert-butylphenylsilane building block contributes unfavorably to the pharmacokinetic profile of bombesin conjugates. In this article, theoretical and experimental studies toward the development of more hydrophilic silicon-based building blocks are presented. Density functional theory calculations were used to predict the hydrolytic stability of di-tert-butylfluorosilanes 2-23 with the aim to improve the in vivo properties of F-18-labeled silicon-containing biomolecules. As a further step toward improving the pharmacokinetic profile, hydrophilic linkers were introduced between the lipophilic di-tert-butylphenylsilane building block and the bombesin congeners. Increased tumor uptake was shown with two of these peptides in xenograft-bearing mice using positron emission tomography and biodistribution studies. The introduction of a hydrophilic linker is thus a viable approach to improve the tumor uptake of F-18-labeled silicon bombesin conjugates.
Silicon-Based Building Blocks for One-Step18F-Radiolabeling of Peptides for PET Imaging
作者:Linjing Mu、Aileen Höhne、P. August Schubiger、Simon M. Ametamey、Keith Graham、John E. Cyr、Ludger Dinkelborg、Timo Stellfeld、Ananth Srinivasan、Ulrike Voigtmann、Ulrich Klar