Efficient 18F-Labeling of Large 37-Amino-Acid pHLIP Peptide Analogues and Their Biological Evaluation
摘要:
Solid tumors often develop an acidic microenvironment, which plays a critical role in tumor progression and is associated with increased level of invasion and metastasis. The 37 residue pH (low) insertion peptide (pHLIP) is under study as an imaging platform because of its Unique ability to insert into cell membranes at a low extracellular pH (pH(e) < 7). Labeling of peptides with [F-18] fluorine is usually performed via prosthetic groups using chemoselective coupling reactions. One of the most successful procedures involves the alkyne-azide copper(I) catalyzed cydoaddition (CuAAC). However, none of the known "click" methods have been applied to peptides as large as pHLIP. We designed a novel prosthetic group and extended the use of the CuAAC "click chemistry" for the simple and efficient F-18 labeling of large peptides. For the evaluation of this labeling approach, a D-amino acid analogue of WT-pHLIP and an L-amino acid control peptide K-pHLIP, both functionalized at the N-terminus with 6-azidohexanoic acid, were used. The novel 6-[F-18]fluoro-2-ethynylpyridine prosthetic group, was obtained via nucleophilic substitution on the corresponding bromo-precursor after 10 mm at 130 C with a radiochemical yield of 27.5 +/- 6.6% (decay corrected) with high radiochemical purity >= 98%. The subsequent Cu-I-catalyzed "click" reaction with the azido functionalized pHLIP peptides was quantitative within 5 min at 70 C in a mixture of water and ethanol using Cu acetate and sodium L-ascorbate. j D-WT-pHLIP and [F-18]-L-K-pHLIP were obtained with total radiochemical yields of 5-20% after HPLC purification. The total reaction time was 85 min including formulation. In vitro stability tests revealed high stability of the [F-18]-6-WT-pHLIP in human and mouse plasma after 120 mm, with the parent tracer remaining intact at 65% and 85%, respectively. PET imaging and biodistribution studies in LNCaP and PC -3 xenografted mice with the [F-18]-6-WT-pHLIP and the negative control [F-18]-L-K-pHLIP revealed pH dependent tumor retention. This reliable and efficient protocol promises to be useful for the F-18 labeling of large peptides such as pHLIP and will accelerate the evaluation of numerous [F-15]-pHLIP analogues as potential PET tracers.
[EN] OXAZOLIDINONES AS MODULATORS OF MGLUR5<br/>[FR] OXAZOLIDINONES EN TANT QUE MODULATEURS DE MGLUR5
申请人:BRISTOL MYERS SQUIBB CO
公开号:WO2012064603A1
公开(公告)日:2012-05-18
The disclosure generally relates to compounds of formula I, including their salts, as well as compositions and methods of using the compounds. The compounds are ligands, agonists and partial agonists for the mGluR5 receptor and may be useful for the treatment of various disorders of the central nervous system.
Compounds for Treating Disorders Mediated by Metabotropic Glutamate Receptor 5, and Methods of Use Thereof
申请人:Hardy Larry Wendell
公开号:US20110319380A1
公开(公告)日:2011-12-29
Provided herein are compounds and methods of synthesis thereof. The compounds set forth herein are useful for the treatment, prevention, and/or management of various disorders, such as neurological disorders, neurodegenerative disorders, neuropsychiatric disorders, disorders of cognition, learning or memory, gastrointestinal disorders, lower urinary tract disorder, and cancer. Compounds set forth herein modulate the activity of metabotropic glutamate receptor 5 (mGluR5) in the central nervous system or the periphery. Pharmaceutical formulations containing the compounds and their methods of use are also provided herein.
METABOTROPHIC GLUTAMATE RECEPTOR 5 MODULATORS AND METHODS OF USE THEREOF
申请人:Heffernan Michele L. R.
公开号:US20140179682A1
公开(公告)日:2014-06-26
Compounds that modulate GluR5 activity and methods of using the same are disclosed.
本发明揭示了调节GluR5活性的化合物及其使用方法。
COMPOUNDS FOR TREATING DISORDERS MEDIATED BY METABOTROPIC GLUTAMATE RECEPTOR 5, AND METHODS OF USE THEREOF
申请人:Sunovion Pharmaceuticals Inc.
公开号:US20140349992A1
公开(公告)日:2014-11-27
Provided herein are compounds and methods of synthesis thereof. The compounds set forth herein are useful for the treatment, prevention, and/or management of various disorders, such as neurological disorders, neurodegenerative disorders, neuropsychiatric disorders, disorders of cognition, learning or memory, gastrointestinal disorders, lower urinary tract disorder, and cancer. Compounds set forth herein modulate the activity of metabotropic glutamate receptor 5 (mGluR5) in the central nervous system or the periphery. Pharmaceutical formulations containing the compounds and their methods of use are also provided herein.
DC-SIGN and its analogue L-SIGN work as co-receptors in many viral infections, including by SARS-CoV-2. Here we describe the first group of small-molecule glycomimetics that bind to L-SIGN, as well as to DC-SIGN, with micromolar affinity.