Double entrapment of growth factors by nanoparticles loaded into polyelectrolyte multilayer films

Vrana, N. E.
Rabineau, M.
Tezcaner, Ayşen
Keskin, Dilek
Lavalle, P.
Delivery of growth factors and control of vascularization are prominent problems in regenerative medicine. Vascular endothelial growth factor (VEGF) has been used both in vitro and in vivo to promote angiogenesis but due to its short half-life its controlled delivery is a sought after method. In this study we present a new concept of degradable drug loaded nanoparticles entrapped into exponentially growing multilayer films. Through hydrolysis of the nanoparticles, the drug can be delivered over long periods in a controlled manner. Poly(epsilon-caprolactone) nanoparticles were loaded with VEGF and in turn the release of VEGF from a surface is controlled by a thick layer-by-layer polyelectrolyte film. Direct loading of VEGF inside the film was not efficient for long-term applications. When VEGF loaded nanoparticles were introduced into the film, the particles were equally distributed inside and were stable after several washes. Moreover, the presence of the film sustained the release of VEGF for 7 days. Addition of the nanoparticles to the film promoted endothelial cell proliferation, mainly due to the presence of VEGF. Mechanical properties of the film (Young's moduli) were also improved by the presence of nanoparticles. However, in the presence of the film loaded with nanoparticles and without any direct contact with this film, endothelial cell growth was also enhanced on polystyrene and on Transwell insert surfaces which demonstrates the effectiveness of the nanoparticles not only to improve the mechanical properties of the film but also to deliver active VEGF. An increase in nitric oxide levels as an indicator of endothelial cell activity was monitored and was correlated with the release of VEGF from the nanoparticle/film platform. Finally, such a system can be used as an auxiliary delivery body within implants to finely control the release of bioactive agent containing nanoparticles.


Targeted delivery of CPG-oligodeoxynucleotide to breast cancer cells by poly-amidoamine dendrimer-modified magnetic nanoparticles
Taghavi Pourianazar, Negar; Gündüz, Ufuk; Gündüz, Güngör; Department of Biotechnology (2016)
One major application of nanotechnology in cancer treatment involves designing nanoparticles to deliver drugs, oligonucleotides, and genes to cancer cells. Nanoparticles should be engineered so that they could target and destroy tumor cells with minimal damage to healthy tissues. This research aims to develop an appropriate and efficient nanocarrier, having the ability of interacting with and delivering CpG-oligodeoxynucleotides (CpG-ODNs) to tumor cells. CpG-ODNs activate Toll-like receptor 9 (TLR9), which...
Evaluation of neointimal hyperplasia on tranilast-coated synthetic vascular grafts: An experimental study
Karakayali, Feza; Haberal, Nihan; Tufan, Hale; Hasırcı, Nesrin; BaSaran, Ozgur; Sevmis, Sinasi; Akdur, Aydin; Kızıltay, Aysel; Haberal, Mehmet (2007-01-01)
Tranilast is an antiallergic drug that interferes with proliferation and migration of vascular smooth muscle cell induced by platelet-derived growth factor (PDGF) and transforming growth factor-beta 1 (TGF-beta 1). We investigated the local effect of tranilast on neointimal hyperplasia using tranilastcoated prosthetic grafts. The inner sides of the thin-walled polytetrafluoroethylene (PTFE) grafts were coated with chitosan and tranilast containing chitosan solution. Wistar albino rats (32) were used in the ...
Evaluation of methylation profiles of an epidermal growth factor receptor gene in a head and neck squamous cell carcinoma patient group
Mutlu, M.; Mutlu, Pelin; Azarkan, S.; Baylr, Ö.; Öcal, B.; Saylam, G.; KORKMAZ, MEHMET HAKAN (2021-03-23)
Upregulation of the epidermal growth factor receptor (EGFR) gene has shown an important impact on the development of head and neck cancers due to its important regulation role on multiple cell signaling pathways. The aim of this study was to investigate the methylation pattern of the promoter region of the EGFR gene between head and neck squamous cell carcinoma (HNSCC) patients and a control group. Forty-seven unrelated HNSCC patients, clinically diagnosed at the Department of Otorhinolaryngology, Dlşkapl Y...
Development of gemcitabine and clofazimine coloaded liposomal delivery system for osteosarcom treatment
Çalışkan, Yağmur; Keskin, Dilek; Özen, Can; Department of Biotechnology (2016)
New strategies for more effective treatments need to be developed to cure osteosarcoma patients. Current study was designed to produce a dual drug delivery system with Gemcitabine (GEM) and Clofazimine (CLF) co-loaded liposomes against osteosarcoma diseases. GEM is a second line therapy for osteosarcoma and with combinational use of another regimen it could be much more effective. CLF, an antimycobacterial agent, has been recently recognized as effective on cancer treatment and it was suggested to act on os...
Inter-tissue convergence of gene expression during ageing suggests age-related loss of tissue and cellular identity
İzgi, Hamit; Han, Dingding; Isildak, Ulas; Huang, Shuyun; Kocabiyik, Ece; Khaitovich, Philipp; Somel, Mehmet; Dönertaş, Handan Melike (2022-01-01)
Developmental trajectories of gene expression may reverse in their direction during ageing, a phenomenon previously linked to cellular identity loss. Our analysis of cerebral cortex, lung, liver and muscle transcriptomes of 16 mice, covering development and ageing intervals, revealed widespread but tissue-specific ageing-associated expression reversals. Cumulatively, these reversals create a unique phenomenon: mammalian tissue transcriptomes diverge from each other during postnatal development, but during a...
Citation Formats
N. E. Vrana et al., “Double entrapment of growth factors by nanoparticles loaded into polyelectrolyte multilayer films,” JOURNAL OF MATERIALS CHEMISTRY B, pp. 999–1008, 2014, Accessed: 00, 2020. [Online]. Available: