In vitro Uptake and Stability Study of pVEC and Its All-D Analog
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A. Elmquist
Abstract
A key step in the development of new hydrophilic pharmaceuticals is to get them through biological barriers. Cell-penetrating peptides, CPPs, have been shown previously to enter cells both in vitro and in vivo by a non-endocytotic mechanism and to be able to carry large cargo molecules with them. Recently, we showed that a small peptide, pVEC, from murine vascular endothelial cadherin, has the characteristics to be classified as a protein derived CPP. Here we have further investigated pVEC together with its all-D analog for cellular uptake, intra- and extracellular stability, and their enzymatic degradation. The two peptides, pVEC and all-D pVEC, translocate into aortic endothelial cells and murine fibroblasts by a nonendocytotic mechanism. In phosphate buffer, pVEC remains intact while the C-terminal lysine is quickly removed in human serum and serumcontaining media. Both pVEC and pVEC without the Cterminal Lys were detected by mass spectrometry inside the two cell types tested. The pVEC half-life is 10.5 min in phosphate buffer containing 10 units of trypsin and 44.6 min in phosphate buffer containing 4.2 units of carboxypeptidase A and 18 units of carboxypeptidase B. In contrast to pVEC, the all-D analog remains intact in serum and resists enzymatic degradation.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
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- Roumen Tsanev, Pioneer of the Early Days of Nucleic Acid Gel Electrophoresis and Histone Code Epigenetics
- Recombinant RNase Z Does Not Recognize CCA as Part of the tRNA and Its Cleavage Efficieny Is Influenced by Acceptor Stem Length
- HIV-1 TAR as Anchoring Site for Optimized Catalytic RNAs
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