TY  - JOUR
A1  - Hochleitner, Gernot
A1  - Jüngst, Tomasz
A1  - Brown, Toby D
A1  - Hahn, Kathrin
A1  - Moseke, Claus
A1  - Jakob, Franz
A1  - Dalton, Paul D
A1  - Groll, Jürgen
T1  - Additive manufacturing of scaffolds with sub-micron filaments via melt electrospinning writing
JF  - Biofabrication
N2  - The aim of this study was to explore the lower resolution limits of an electrohydrodynamic process combined with direct writing technology of polymer melts. Termed melt electrospinning writing, filaments are deposited layer-by-layer to produce discrete three-dimensional scaffolds for in vitro research. Through optimization of the parameters (flow rate, spinneret diameter, voltage, collector distance) for poly-ϵ-caprolactone, we could direct-write coherent scaffolds with ultrafine filaments, the smallest being 817 ± 165 nm. These low diameter filaments were deposited to form box-structures with a periodicity of 100.6 ± 5.1 μm and a height of 80 μm (50 stacked filaments; 100 overlap at intersections). We also observed oriented crystalline regions within such ultrafine filaments after annealing at 55 °C. The scaffolds were printed upon NCO-sP(EO-stat-PO)-coated glass slide surfaces and withstood frequent liquid exchanges with negligible scaffold detachment for at least 10 days in vitro.
KW  - additive manufacturing
KW  - 3D printing
KW  - biodegradable polymers
KW  - microstructures
KW  - nanostructures
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-254053
VL  - 7
IS  - 3
ER  - 
TY  - JOUR
A1  - Tylek, Tina
A1  - Schilling, Tatjana
A1  - Schlegelmilch, Katrin
A1  - Ries, Maximilian
A1  - Rudert, Maximilian
A1  - Jakob, Franz
A1  - Groll, Jürgen
T1  - Platelet lysate outperforms FCS and human serum for co-culture of primary human macrophages and hMSCs
JF  - Scientific Reports
N2  - In vitro co-cultures of different primary human cell types are pivotal for the testing and evaluation of biomaterials under conditions that are closer to the human in vivo situation. Especially co-cultures of macrophages and mesenchymal stem cells (MSCs) are of interest, as they are both present and involved in tissue regeneration and inflammatory reactions and play crucial roles in the immediate inflammatory reactions and the onset of regenerative processes, thus reflecting the decisive early phase of biomaterial contact with the host. A co-culture system of these cell types might thus allow for the assessment of the biocompatibility of biomaterials. The establishment of such a co-culture is challenging due to the different in vitro cell culture conditions. For human macrophages, medium is usually supplemented with human serum (hS), whereas hMSC culture is mostly performed using fetal calf serum (FCS), and these conditions are disadvantageous for the respective other cell type. We demonstrate that human platelet lysate (hPL) can replace hS in macrophage cultivation and appears to be the best option for co-cultivation of human macrophages with hMSCs. In contrast to FCS and hS, hPL maintained the phenotype of both cell types, comparable to that of their respective standard culture serum, as well as the percentage of each cell population. Moreover, the expression profile and phagocytosis activity of macrophages was similar to hS.
KW  - biomaterials – cells
KW  - tissue engineering
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-229174
VL  - 9
ER  -