@article{SchneiderPultarOesterreicheretal., author = {Schneider, Jaana and Pultar, Marianne and Oesterreicher, Johannes and Bobbili, Madhusudhan Reddy and M{\"u}hleder, Severin and Priglinger, Eleni and Redl, Heinz and Spittler, Andreas and Grillari, Johannes and Holnthoner, Wolfgang}, title = {Cre mRNA Is Not Transferred by EVs from Endothelial and Adipose-Derived Stromal/Stem Cells during Vascular Network Formation}, series = {Int J Mol Sci.}, volume = {2021}, journal = {Int J Mol Sci.}, number = {22(8)}, pages = {4050}, abstract = {Coculture systems employing adipose tissue-derived mesenchymal stromal/stem cells (ASC) and endothelial cells (EC) represent a widely used technique to model vascularization. Within this system, cell-cell communication is crucial for the achievement of functional vascular network formation. Extracellular vesicles (EVs) have recently emerged as key players in cell communication by transferring bioactive molecules between cells. In this study we aimed to address the role of EVs in ASC/EC cocultures by discriminating between cells, which have received functional EV cargo from cells that have not. Therefore, we employed the Cre-loxP system, which is based on donor cells expressing the Cre recombinase, whose mRNA was previously shown to be packaged into EVs and reporter cells containing a construct of floxed dsRed upstream of the eGFP coding sequence. The evaluation of Cre induced color switch in the reporter system via EVs indicated that there is no EV-mediated RNA transmission either between EC themselves or EC and ASC. However, since Cre mRNA was not found present in EVs, it remains unclear if Cre mRNA is generally not packaged into EVs or if EVs are not taken up by the utilized cell types. Our data indicate that this technique may not be applicable to evaluate EV-mediated cell-to-cell communication in an in vitro setting using EC and ASC. Further investigations will require a functional system showing efficient and specific loading of Cre mRNA or protein into EVs.}, subject = {Tissue Engineering}, language = {en} } @article{HeinzelOberhauserKeibletal., author = {Heinzel, Johannes Christoph and Oberhauser, Viola and Keibl, Claudia and Sch{\"a}dl, Barbara and Swiadek, Nicole V. and L{\"a}ngle, Gregor and Frick, Helen and Slezak, Cyrill and Prahm, Cosima and Grillari, Johannes and Kolbenschlag, Jonas and Hercher, David}, title = {ESWT Diminishes Axonal Regeneration following Repair of the Rat Median Nerve with Muscle-In-Vein Conduits but Not after Autologous Nerve Grafting}, series = {Biomedicines}, volume = {2022}, journal = {Biomedicines}, number = {10(8)}, pages = {1777}, abstract = {Investigations reporting positive effects of extracorporeal shockwave therapy (ESWT) on nerve regeneration are limited to the rat sciatic nerve model. The effects of ESWT on muscle-in-vein conduits (MVCs) have also not been investigated yet. This study aimed to evaluate the effects of ESWT after repair of the rat median nerve with either autografts (ANGs) or MVCs. In male Lewis rats, a 7 mm segment of the right median nerve was reconstructed either with an ANG or an MVC. For each reconstructive technique, one group of animals received one application of ESWT while the other rats served as controls. The animals were observed for 12 weeks, and nerve regeneration was assessed using computerized gait analysis, the grasping test, electrophysiological evaluations and histological quantification of axons, blood vessels and lymphatic vasculature. Here, we provide for the first time a comprehensive analysis of ESWT effects on nerve regeneration in a rat model of median nerve injury. Furthermore, this study is among the first reporting the quantification of lymphatic vessels following peripheral nerve injury and reconstruction in vivo. While we found no significant direct positive effects of ESWT on peripheral nerve regeneration, results following nerve repair with MVCs were significantly inferior to those after ANG repair.}, subject = {Tissue Engineering}, language = {en} } @article{RohringerHolnthonerHackletal., author = {Rohringer, Sabrina and Holnthoner, Wolfgang and Hackl, Matthias and Weihs, Anna and R{\"u}nzler, Dominik and Skalicky, Susanna and Karbiener, Michael and Scheideler, Marcel and Pr{\"o}ll, Johannes and Gabriel, Christian and Schweighofer, Bernhard and Gr{\"o}ger, Marion and Spittler, Andreas and Grillari, Johannes and Redl, Heinz}, title = {Molecular and cellular effects of in vitro shockwave treatment on lymphatic endothelial cells.}, series = {PLoS one}, journal = {PLoS one}, subject = {Shockwave}, language = {en} } @article{DeiningerWagnerHeimeletal., author = {Deininger, Christian and Wagner, Andrea and Heimel, Patrick and Salzer, Elias and Monforte Vila, Xavier and Weißenbacher, Nadja and Grillari, Johannes and Redl, Heinz and Wichlas, Florian and Freude, Thomas and Tempfer, Herbert and Teuschl-Woller, Andreas and Traweger, Andreas}, title = {Enhanced BMP-2-Mediated Bone Repair Using an Anisotropic Silk Fibroin Scaffold Coated with Bone-like Apatite}, series = {Int. J. Mol. Sci.}, volume = {23}, journal = {Int. J. Mol. Sci.}, number = {1 / 283}, abstract = {The repair of large bone defects remains challenging and often requires graft material due to limited availability of autologous bone. In clinical settings, collagen sponges loaded with excessive amounts of bone morphogenetic protein 2 (rhBMP-2) are occasionally used for the treatment of bone non-unions, increasing the risk of adverse events. Therefore, strategies to reduce rhBMP-2 dosage are desirable. Silk scaffolds show great promise due to their favorable biocompatibility and their utility for various biofabrication methods. For this study, we generated silk scaffolds with axially aligned pores, which were subsequently treated with 10× simulated body fluid (SBF) to generate an apatitic calcium phosphate coating. Using a rat femoral critical sized defect model (CSD) we evaluated if the resulting scaffold allows the reduction of BMP-2 dosage to promote efficient bone repair by providing appropriate guidance cues. Highly porous, anisotropic silk scaffolds were produced, demonstrating good cytocompatibility in vitro and treatment with 10× SBF resulted in efficient surface coating. In vivo, the coated silk scaffolds loaded with a low dose of rhBMP-2 demonstrated significantly improved bone regeneration when compared to the unmineralized scaffold. Overall, our findings show that this simple and cost-efficient technique yields scaffolds that enhance rhBMP-2 mediated bone healing.}, subject = {Tissue Engineering}, language = {en} } @article{FeichtingerHeimelTangletal., author = {Feichtinger, Xaver and Heimel, Patrick and Tangl, Stefan and Keibl, Claudia and N{\"u}rnberger, Sylvia and Schanda, Jakob Emanuel and Hercher, David and Kocijan, Roland and Redl, Heinz and Grillari, Johannes and Fialka, Christian and Mittermayr, Rainer}, title = {Improved biomechanics in experimental chronic rotator cuff repair after shockwaves is not reflected by bone microarchitecture}, series = {PLoS One}, volume = {17}, journal = {PLoS One}, number = {1}, doi = {10.1371/journal.pone.0262294}, subject = {chronic rotator cuff repair}, language = {en} }