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DPepH3, an Improved Peptide Shuttle for Receptor-independent Transport across the Blood-Brain Barrier.

07:00 EST 12th February 2020 | BioPortfolio

Summary of "DPepH3, an Improved Peptide Shuttle for Receptor-independent Transport across the Blood-Brain Barrier."

The use of peptides as drug carriers across the blood-brain barrier (BBB) has increased significantly during the last decades. PepH3, a seven residue sequence (AGILKRW) derived from the α-helical domain of the dengue virus type-2 capsid protein, translocates across the BBB with very low toxicity. Somehow predictably from its size and sequence, PepH3 is degraded in serum relatively fast. Among strategies to increase peptide half-life (t1/2), use of the enantiomer (wholly made of D-amino acid residues) can be quite successful if the peptide interacts with a target in non-stereospecific fashion. Here we report that aGilkrw (DPepH3), the enantiomer of PepH3, has a much longer t1/2. We also confirm that BBB translocation is receptor-independent, which fully validates the enantiomer strategy chosen. Moreover, the cell internalization step that initiates transcytosis follows a macropinocytosis pathway. Taken together, our results place DPepH3 at the forefront of a second generation of BBB shuttles with excellent translocation and internalization properties, safety, and improved stability.

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Name: Current pharmaceutical design
ISSN: 1873-4286
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Medical and Biotech [MESH] Definitions

A G-protein-coupled, proteinase-activated receptor that is expressed in a variety of tissues including ENDOTHELIUM; LEUKOCYTES; and the GASTROINTESTINAL TRACT. The receptor is activated by TRYPSIN, which cleaves off the N-terminal peptide from the receptor. The new N-terminal peptide is a cryptic ligand for the receptor. The uncleaved receptor can also be activated by the N-terminal peptide present on the activated THROMBIN RECEPTOR and by small synthetic peptides that contain the unmasked N-terminal sequence.

A large group of membrane transport proteins that shuttle MONOSACCHARIDES across CELL MEMBRANES.

The production of PEPTIDES or PROTEINS by the constituents of a living organism. The biosynthesis of proteins on RIBOSOMES following an RNA template is termed translation (TRANSLATION, GENETIC). There are other, non-ribosomal peptide biosynthesis (PEPTIDE BIOSYNTHESIS, NUCLEIC ACID-INDEPENDENT) mechanisms carried out by PEPTIDE SYNTHASES and PEPTIDYLTRANSFERASES. Further modifications of peptide chains yield functional peptide and protein molecules.

A family of proteinase-activated receptors that are specific for THROMBIN. They are found primarily on PLATELETS and on ENDOTHELIAL CELLS. Activation of thrombin receptors occurs through the proteolytic action of THROMBIN, which cleaves the N-terminal peptide from the receptor to reveal a new N-terminal peptide that is a cryptic ligand for the receptor. The receptors signal through HETEROTRIMERIC GTP-BINDING PROTEINS. Small synthetic peptides that contain the unmasked N-terminal peptide sequence can also activate the receptor in the absence of proteolytic activity.

A class of sodium-independent nucleoside transporters that mediate the facilitative transport of NUCLEOSIDES.

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