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New diketopiperazines as vectors for peptide protection and brain delivery: Synthesis and biological evaluation
- Source :
- Journal of Labelled Compounds and Radiopharmaceuticals. 59:517-530
- Publication Year :
- 2016
- Publisher :
- Wiley, 2016.
-
Abstract
- New strategies allowing the transfer of molecules, especially peptides, through the blood-brain barriers are a major pharmacological challenge for the treatment of brain diseases. The present study aims at evaluating in vivo the cerebral bioavailability of carrier systems, based on small and functionalizable 2,5-diketopiperazine (DKP) motifs. We studied 2 different cyclo(Lys-Lys) DKP scaffolds alone and a cyclo(Lys-Gly) DKP carrier bearing as peptide model, the tau protein hexapeptide VQIVYK sequence. The different carrier systems were synthesized and radiolabeled using one of the free domains. The stability, biodistribution, and ability to cross blood-brain barrier were investigated in vivo in mice for 99mTc-DKP scaffolds, 99mTc-HVQIVYK peptide alone, and 99mTc-DKP-VQIVYK. 125I-labelled bovine serum albumin was used as negative control for brain uptake. Both radiolabeled DKPs scaffolds and 99mTc-DKP-VQIVYK showed a high stability, while peptide 99mTc-HVQIVYK alone was quickly degraded in vivo. The presence of 99mTc-DKPs scaffolds and 99mTc-DKP-VQIVYK was observed in the ventricular and subarachnoid spaces and to a lower extent in the brain parenchyma up to 45 minutes post-injection in mice. This work highlights the potentiality of DKP scaffolds as vectors to transport peptides into the brain by limiting proteolysis and favoring cerebral bioavailability.
- Subjects :
- Biodistribution
Proteolysis
Peptide
010402 general chemistry
Blood–brain barrier
01 natural sciences
Biochemistry
Analytical Chemistry
03 medical and health sciences
0302 clinical medicine
In vivo
Drug Discovery
Parenchyma
medicine
Radiology, Nuclear Medicine and imaging
Bovine serum albumin
Spectroscopy
chemistry.chemical_classification
medicine.diagnostic_test
biology
Chemistry
Organic Chemistry
0104 chemical sciences
Bioavailability
medicine.anatomical_structure
biology.protein
030217 neurology & neurosurgery
Subjects
Details
- ISSN :
- 03624803
- Volume :
- 59
- Database :
- OpenAIRE
- Journal :
- Journal of Labelled Compounds and Radiopharmaceuticals
- Accession number :
- edsair.doi...........36b25fefcb0703de319ebf8ea9ae8817