Ewa Kijeńska - Academia.edu (original) (raw)
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Papers by Ewa Kijeńska
Nerve tissue engineering (TE) is a rapidly expanding area of research advancing towards the repai... more Nerve tissue engineering (TE) is a rapidly expanding area of research advancing towards the repair and regeneration of non-union peripheral nerve defects caused by injuries. The current challenge for researchers is to develop a biomimetic scaffold that is capable of stimulating the re-growth of the native tissue, thus structurally mimicking the extracellular matrix (ECM), providing chemical guidance cues and mechanical support for re-enervation of the damaged region. Laminin is a glycoprotein naturally occurring in nerves and it plays a significant role towards the migration of nerve cells and axonal outgrowth. In this study, laminin incorporated scaffolds were produced by co-axial electrospinning and blend electrospinning techniques, in order to develop suitable biomaterial constructs for peripheral nerve tissue regeneration. Core-shell and blend nanofibers of laminin incorporated poly(L-lactic acid)-co-poly(e-caprolactone) (PLCL) with diameters of 316 ± 110 nm and 350 ± 112 nm were respectively, fabricated and the morphology, surface hydrophilicity, chemical and mechanical properties were investigated. The ability of attachment and proliferation of Schwann cells on the electrospun nanofibrous scaffolds was investigated by cell proliferation assay and their phenotype was evaluated by immunocytochemical staining using specific S100 antibody. The cells were found to attach and proliferate on coreshell PLCL-laminin scaffolds, expressing bi-and tri-polar elongations retaining their typical phenotype. Results of 7 days of in vitro culture of Schwann cells, showed 78% increase in cell proliferation on core-shell structured nanofibers compared to blend PLCL-laminin scaffolds, which confirmed the potential application of these constructs as substrates for peripheral nerve regeneration.
Micron, 2015
Electrospun polymeric submicron and nanofibers can be used as tissue engineering scaffolds in reg... more Electrospun polymeric submicron and nanofibers can be used as tissue engineering scaffolds in regenerative medicine. In physiological conditions fibers are subjected to stresses and strains from the surrounding biological environment. Such stresses can cause permanent deformation or even failure to their structure. Therefore, there is a growing necessity to characterize their mechanical properties, especially at the nanoscale.
Journal of Biomedical Materials Research Part B: Applied Biomaterials, 2012
One of the biggest challenges in peripheral nerve tissue engineering is to create an artificial n... more One of the biggest challenges in peripheral nerve tissue engineering is to create an artificial nerve graft that could mimic the extracellular matrix (ECM) and assist in nerve regeneration. Bio-composite nanofibrous scaffolds made from synthetic and natural polymeric blends provide suitable substrate for tissue engineering and it can be used as nerve guides eliminating the need of autologous nerve grafts. Nanotopography or orientation of the fibers within the scaffolds greatly influences the nerve cell morphology and outgrowth, and the alignment of the fibers ensures better contact guidance of the cells. In this study, poly (L-lactic acid)-co-poly(e-caprolactone) or P(LLA-CL), collagen I and collagen III are utilized for the fabrication of nanofibers of different compositions and orientations (random and aligned) by electrospinning. The morphology, mechanical, physical, and chemical properties of the electrospun scaffolds along with their biocompatibility using C17.2 nerve stem cells are studied to identify the suitable material compositions and topography of the electrospun scaffolds required for peripheral nerve regeneration. Aligned P(LLA-CL)/collagen I/collagen III nanofibrous scaffolds with average diameter of 253 6 102 nm were fabricated and characterized with a tensile strength of 11.59 6 1.68 MPa. Cell proliferation studies showed 22% increase in cell proliferation on aligned P(LLA-CL)/collagen I/collagen III scaffolds compared with aligned pure P(LLA-CL) scaffolds. Results of our in vitro cell proliferation, cell-scaffold interaction, and neurofilament protein expression studies demonstrated that the electrospun aligned P(LLA-CL)/collagen I/collagen III nanofibrous scaffolds mimic more closely towards the ECM of nerve and have great potential as a substrate for accelerated regeneration of the nerve.
European Journal of Pharmaceutics and Biopharmaceutics, 2009
The objective of this study was to investigate and to better understand the properties of buccal ... more The objective of this study was to investigate and to better understand the properties of buccal mucosa as a semipermeable membrane and a portal for drug administration by iontophoretic and electroosmotic means. In vitro experiments showed that buccal mucosa at the pH of about 7.4 behaved as a cationexchange membrane and non-linear resistor. It had lower resistance and was more permeable for water than a skin. The electroosmotic volume flow through mucosa depended on current density, mucosa resistance and electrolyte concentration. Sodium dodecyl sulfate (in concentration range 0.001-0.005 mol L À1 ) and urea (in concentration range 0.42-1.67 mol L À1 ) did not promote a water transfer through buccal mucosa, however, both substances enhanced flow through the skin.
Nerve tissue engineering (TE) is a rapidly expanding area of research advancing towards the repai... more Nerve tissue engineering (TE) is a rapidly expanding area of research advancing towards the repair and regeneration of non-union peripheral nerve defects caused by injuries. The current challenge for researchers is to develop a biomimetic scaffold that is capable of stimulating the re-growth of the native tissue, thus structurally mimicking the extracellular matrix (ECM), providing chemical guidance cues and mechanical support for re-enervation of the damaged region. Laminin is a glycoprotein naturally occurring in nerves and it plays a significant role towards the migration of nerve cells and axonal outgrowth. In this study, laminin incorporated scaffolds were produced by co-axial electrospinning and blend electrospinning techniques, in order to develop suitable biomaterial constructs for peripheral nerve tissue regeneration. Core-shell and blend nanofibers of laminin incorporated poly(L-lactic acid)-co-poly(e-caprolactone) (PLCL) with diameters of 316 ± 110 nm and 350 ± 112 nm were respectively, fabricated and the morphology, surface hydrophilicity, chemical and mechanical properties were investigated. The ability of attachment and proliferation of Schwann cells on the electrospun nanofibrous scaffolds was investigated by cell proliferation assay and their phenotype was evaluated by immunocytochemical staining using specific S100 antibody. The cells were found to attach and proliferate on coreshell PLCL-laminin scaffolds, expressing bi-and tri-polar elongations retaining their typical phenotype. Results of 7 days of in vitro culture of Schwann cells, showed 78% increase in cell proliferation on core-shell structured nanofibers compared to blend PLCL-laminin scaffolds, which confirmed the potential application of these constructs as substrates for peripheral nerve regeneration.
Micron, 2015
Electrospun polymeric submicron and nanofibers can be used as tissue engineering scaffolds in reg... more Electrospun polymeric submicron and nanofibers can be used as tissue engineering scaffolds in regenerative medicine. In physiological conditions fibers are subjected to stresses and strains from the surrounding biological environment. Such stresses can cause permanent deformation or even failure to their structure. Therefore, there is a growing necessity to characterize their mechanical properties, especially at the nanoscale.
Journal of Biomedical Materials Research Part B: Applied Biomaterials, 2012
One of the biggest challenges in peripheral nerve tissue engineering is to create an artificial n... more One of the biggest challenges in peripheral nerve tissue engineering is to create an artificial nerve graft that could mimic the extracellular matrix (ECM) and assist in nerve regeneration. Bio-composite nanofibrous scaffolds made from synthetic and natural polymeric blends provide suitable substrate for tissue engineering and it can be used as nerve guides eliminating the need of autologous nerve grafts. Nanotopography or orientation of the fibers within the scaffolds greatly influences the nerve cell morphology and outgrowth, and the alignment of the fibers ensures better contact guidance of the cells. In this study, poly (L-lactic acid)-co-poly(e-caprolactone) or P(LLA-CL), collagen I and collagen III are utilized for the fabrication of nanofibers of different compositions and orientations (random and aligned) by electrospinning. The morphology, mechanical, physical, and chemical properties of the electrospun scaffolds along with their biocompatibility using C17.2 nerve stem cells are studied to identify the suitable material compositions and topography of the electrospun scaffolds required for peripheral nerve regeneration. Aligned P(LLA-CL)/collagen I/collagen III nanofibrous scaffolds with average diameter of 253 6 102 nm were fabricated and characterized with a tensile strength of 11.59 6 1.68 MPa. Cell proliferation studies showed 22% increase in cell proliferation on aligned P(LLA-CL)/collagen I/collagen III scaffolds compared with aligned pure P(LLA-CL) scaffolds. Results of our in vitro cell proliferation, cell-scaffold interaction, and neurofilament protein expression studies demonstrated that the electrospun aligned P(LLA-CL)/collagen I/collagen III nanofibrous scaffolds mimic more closely towards the ECM of nerve and have great potential as a substrate for accelerated regeneration of the nerve.
European Journal of Pharmaceutics and Biopharmaceutics, 2009
The objective of this study was to investigate and to better understand the properties of buccal ... more The objective of this study was to investigate and to better understand the properties of buccal mucosa as a semipermeable membrane and a portal for drug administration by iontophoretic and electroosmotic means. In vitro experiments showed that buccal mucosa at the pH of about 7.4 behaved as a cationexchange membrane and non-linear resistor. It had lower resistance and was more permeable for water than a skin. The electroosmotic volume flow through mucosa depended on current density, mucosa resistance and electrolyte concentration. Sodium dodecyl sulfate (in concentration range 0.001-0.005 mol L À1 ) and urea (in concentration range 0.42-1.67 mol L À1 ) did not promote a water transfer through buccal mucosa, however, both substances enhanced flow through the skin.