Vascular Cell | |
Growth factor purification and delivery systems (PADS) for therapeutic angiogenesis | |
Gene L Bidwell3  Eddie Perkins2  Fakhri Mahdi3  Grant G Robinson3  Huiling Liu3  Eric M George1  | |
[1] Department of Biochemistry, University of Mississippi Medical Center, 2500 North State Street, Jackson 39216, MS, USA;Department of Neurobiology and Anatomical Sciences, University of Mississippi Medical Center, 2500 North State Street, Jackson 39216, MS, USA;Department of Neurology, University of Mississippi Medical Center, 2500 North State Street, Jackson 39216, MS, USA | |
关键词: Purification and delivery system; Therapeutic angiogenesis; Drug delivery; Elastin-like polypeptide; Vascular endothelial growth factor; | |
Others : 1130997 DOI : 10.1186/s13221-014-0026-3 |
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received in 2014-08-25, accepted in 2014-12-16, 发布年份 2015 | |
【 摘 要 】
Background
Therapeutic angiogenesis with vascular endothelial growth factor (VEGF), delivered either via recombinant protein infusion or via gene therapy, has shown promise in preclinical models of various diseases including myocardial infarction, renovascular disease, preeclampsia, and neurodegenerative disorders. However, dosing, duration of expression, and tissue specificity are challenges to VEGF gene therapy, and recombinant VEGF delivery suffers from extremely rapid plasma clearance, necessitating continuous infusion and/or direct injection at the site of interest.
Methods
Here we describe a novel growth factor purification and delivery system (PADS) generated by fusion of VEGF121 to a protein polymer based on Elastin-like Polypeptide (ELP). ELP is a thermally responsive biopolymer derived from a five amino acid repeat sequence found in human tropoelastin. VEGFPADS were constructed by fusion of the ELP coding sequence in-frame with the VEGF121 coding sequence connected by a flexible di-glycine linker. In vitro activity of VEGFPADS was determined using cell proliferation, tube formation, and migration assays with vascular endothelial cells. Pharmacokinetics and biodistribution of VEGFPADS in vivo were compared to free VEGF in mice using quantitative fluorescence techniques.
Results
ELP fusion allowed for recombinant expression and simple, non-chromatographic purification of the ELP-VEGF121 chimera in yields as high as 90 mg/L of culture and at very high purity. ELP fusion had no effect on the VEGF activity, as the VEGFPADS were equally potent as free VEGF121 in stimulating HUVEC proliferation, tube formation, and migration. Additionally, the VEGFPADS had a molecular weight five-fold larger than free VEGF121, which lead to slower plasma clearance and an altered biodistribution after systemic delivery in vivo.
Conclusion
PADS represent a new method of both purification and in vivo stabilization of recombinant growth factors. The use of this system could permit recombinant growth factors to become viable options for therapeutic angiogenesis in a number of disease models.
【 授权许可】
2015 George et al.; licensee Biomed Central.
【 预 览 】
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20150228170602568.pdf | 1548KB | download | |
Figure 4. | 43KB | Image | download |
Figure 3. | 104KB | Image | download |
Figure 2. | 23KB | Image | download |
Figure 1. | 23KB | Image | download |
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