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Title: Design, Synthesis, and In Vitro and In Vivo Evaluation of an 18 F-Labeled Sphingosine 1-Phosphate Receptor 1 (S1P1) PET Tracer

Journal Article · · Journal of Medicinal Chemistry
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  1. Washington University School of Medicine, St. Louis, MO (United States). Department of Radiology
  2. The Scripps Research Institute Molecular Screening Center, La Jolla, CA (United States)

We present that sphingosine 1-phosphate receptor 1 (S1P1) plays a pivotal signaling role in inflammatory response; because S1P1 modulation has been identified as a therapeutic target for various diseases, a PET tracer for S1P1 would be a useful tool. Fourteen fluorine-containing analogues of S1P ligands were synthesized and their in vitro binding potency measured; four had high potency and selectivity for S1P1 (S1P1 IC50 < 10 nM, >100-fold selectivity for S1P1 over S1P2 and S1P3). The most potent ligand, 28c (IC50 = 2.63 nM for S1P1) was 18F-labeled and evaluated in a mouse model of LPS-induced acute liver injury to determine its S1P1-binding specificity. The results from biodistribution, autoradiography, and microPET imaging showed higher [18F]28c accumulation in the liver of LPS-treated mice than controls. Increased expression of S1P1 in the LPS model was confirmed by immunohistochemical analysis (IHC). Finally, these data suggest that [18F]28c is a S1P1 PET tracer with high potential for imaging S1P1 in vivo.

Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0008432; SC0012737
OSTI ID:
1466768
Journal Information:
Journal of Medicinal Chemistry, Vol. 59, Issue 13; ISSN 0022-2623
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (2)

Syntheses and in vitro biological evaluation of S1PR1 ligands and PET studies of four F-18 labeled radiotracers in the brain of nonhuman primates journal January 2018
Less Exploited GPCRs in Precision Medicine: Targets for Molecular Imaging and Theranostics journal December 2018