@article{ReilingKrohneFriedrichetal.2018,
  author    = {Reiling, Sarah J. and Krohne, Georg and Friedrich, Oliver and Geary, Timothy G. and Rohrbach, Petra},
  title     = {Chloroquine exposure triggers distinct cellular responses in sensitive versus resistant Plasmodium falciparum parasites},
  series = {Scientific Reports},
  volume    = {8},
  journal   = {Scientific Reports},
  number    = {11137},
  doi       = {10.1038/s41598-018-29422-6},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-225123},
  pages     = {1-11},
  year      = {2018},
  abstract  = {Chloroquine (CQ) treatment failure in Plasmodium falciparum parasites has been documented for decades, but the pharmacological explanation of this phenotype is not fully understood. Current concepts attribute CQ resistance to reduced accumulation of the drug at a given external CQ concentration ([CQ] ex) in resistant compared to sensitive parasites. The implication of this explanation is that the mechanisms of CQ-induced toxicity in resistant and sensitive strains are similar once lethal internal concentrations have been reached. To test this hypothesis, we investigated the mechanism of CQ-induced toxicity in CQ-sensitive (CQS) versus CQ-resistant (CQR) parasites by analyzing the time-course of cellular responses in these strains after exposure to varying [CQ] ex as determined in 72 h toxicity assays. Parasite killing was delayed in CQR parasites for up to 10 h compared to CQS parasites when exposed to equipotent [CQ] ex. In striking contrast, brief exposure (1 h) to lethal [CQ] ex in CQS but not CQR parasites caused the appearance of hitherto undescribed hemozoin (Hz)-containing compartments in the parasite cytosol. Hz-containing compartments were very rarely observed in CQR parasites even after CQ exposures sufficient to cause irreversible cell death. These findings challenge current concepts that CQ killing of malaria parasites is solely concentration-dependent, and instead suggest that CQS and CQR strains fundamentally differ in the consequences of CQ exposure.},
  language  = {en}
}
@article{HazurDetschKarakayaetal.2020,
  author    = {Hazur, Jonas and Detsch, Rainer and Karakaya, Emine and Kaschta, Joachim and Teßmar, J{\"o}rg and Schneidereit, Dominik and Friedrich, Oliver and Schubert, Dirk W and Boccaccini, Aldo R},
  title     = {Improving alginate printability for biofabrication: establishment of a universal and homogeneous pre-crosslinking technique},
  series = {Biofabrication},
  volume    = {12},
  journal   = {Biofabrication},
  number    = {4},
  doi       = {10.1088/1758-5090/ab98e5},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-254030},
  year      = {2020},
  abstract  = {Many different biofabrication approaches as well as a variety of bioinks have been developed by researchers working in the field of tissue engineering. A main challenge for bioinks often remains the difficulty to achieve shape fidelity after printing. In order to overcome this issue, a homogeneous pre-crosslinking technique, which is universally applicable to all alginate-based materials, was developed. In this study, the Young's Modulus after post-crosslinking of selected hydrogels, as well as the chemical characterization of alginate in terms of M/G ratio and molecular weight, were determined. With our technique it was possible to markedly enhance the printability of a 2\% (w/v) alginate solution, without using a higher polymer content, fillers or support structures. 3D porous scaffolds with a height of around 5 mm were printed. Furthermore, the rheological behavior of different pre-crosslinking degrees was studied. Shear forces on cells as well as the flow profile of the bioink inside the printing nozzle during the process were estimated. A high cell viability of printed NIH/3T3 cells embedded in the novel bioink of more than 85\% over a time period of two weeks could be observed.},
  language  = {en}
}
@article{RymaGencNadernezhadetal.2022,
  author    = {Ryma, Matthias and Gen{\c{c}}, Hatice and Nadernezhad, Ali and Paulus, Ilona and Schneidereit, Dominik and Friedrich, Oliver and Andelovic, Kristina and Lyer, Stefan and Alexiou, Christoph and Cicha, Iwona and Groll, J{\"u}rgen},
  title     = {A Print-and-Fuse Strategy for Sacrificial Filaments Enables Biomimetically Structured Perfusable Microvascular Networks with Functional Endothelium Inside 3D Hydrogels},
  series = {Advanced Materials},
  volume    = {34},
  journal   = {Advanced Materials},
  number    = {28},
  doi       = {10.1002/adma.202200653},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-318532},
  year      = {2022},
  abstract  = {A facile and flexible approach for the integration of biomimetically branched microvasculature within bulk hydrogels is presented. For this, sacrificial scaffolds of thermoresponsive poly(2-cyclopropyl-2-oxazoline) (PcycloPrOx) are created using melt electrowriting (MEW) in an optimized and predictable way and subsequently placed into a customized bioreactor system, which is then filled with a hydrogel precursor solution. The aqueous environment above the lower critical solution temperature (LCST) of PcycloPrOx at 25 °C swells the polymer without dissolving it, resulting in fusion of filaments that are deposited onto each other (print-and-fuse approach). Accordingly, an adequate printing pathway design results in generating physiological-like branchings and channel volumes that approximate Murray's law in the geometrical ratio between parent and daughter vessels. After gel formation, a temperature decrease below the LCST produces interconnected microchannels with distinct inlet and outlet regions. Initial placement of the sacrificial scaffolds in the bioreactors in a pre-defined manner directly yields perfusable structures via leakage-free fluid connections in a reproducible one-step procedure. Using this approach, rapid formation of a tight and biologically functional endothelial layer, as assessed not only through fluorescent dye diffusion, but also by tumor necrosis factor alpha (TNF-α) stimulation, is obtained within three days.},
  language  = {en}
}