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A specific drug targeting system based on polyhydroxyalkanoate granule binding protein PhaP fused with targeted cell ligands

Paper ID Volume ID Publish Year Pages File Format Full-Text
9074 616 2008 8 PDF Available
Title
A specific drug targeting system based on polyhydroxyalkanoate granule binding protein PhaP fused with targeted cell ligands
Abstract

Polyhydroxyalkanoates (PHA) is a family of intracellular biopolyesters produced by many bacteria. PHA granule binding protein PhaP is able to bind to hydrophobic polymers via strong hydrophobic interaction. A receptor-mediated drug delivery system was developed in this study based on PhaP. The system consists of PHA nanoparticles, PhaP and polypeptide or protein ligands fused to PhaP. The PHA nanoparticles were used to package mostly hydrophobic drugs; PhaP fused with ligands produced by over-expression of their corresponding genes in Pichia pastoris, or E. coli was able to attach to hydrophobic PHA nanoparticle. At the end, the ligands were able to pull the PhaP–PHA nanoparticles to the targeted cells with receptors recognized by the ligands. It was found in this study that the receptor-mediated drug specific delivery system ligand–PhaP–PHA nanoparticles were taken up by macrophages, hepatocellular carcinoma cell BEL7402 in vitro and liver, hepatocellular carcinoma cells in vivo, respectively, when the ligands were mannosylated human α1-acid glycoprotein (hAGP) and human epidermal growth factor (hEGF), respectively, which were able to bind to receptors of macrophages or hepatocellular carcinoma cells. The nanoparticle system was clearly visible in the targeted cells and organs (liver or tumor) under fluorescence microscopy when rhodamine B isothiocyanate (RBITC) was used as a delivery model drug due to the specific targeting effect created by specific ligand and receptor binding. The delivery system of hEGF–PhaP–nanoparticles carrying RBITC was found to be endocytosed by the tumor cells in tumorous model mice. Thus, the ligand–PhaP–PHA specific drug delivery system was proven effective both in vitro and in vivo.

Keywords
PHB; Polyhydroxyalkanoates; Drug delivery; Granule binding protein; PhaP; Receptor-mediated-endocytosis
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A specific drug targeting system based on polyhydroxyalkanoate granule binding protein PhaP fused with targeted cell ligands
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 29, Issue 36, December 2008, Pages 4823–4830
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us