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Background: Human mesenchymal stem cells (hMSCs) have shown their multipotential including differentiating towards endothelial and smooth muscle cell lineages, which triggers a new interest for using hMSCs as a putative source for cardiovascular regenerative medicine. Our recent publication has shown for the first time that purinergic 2 receptors are key players during hMSC differentiation towards adipocytes and osteoblasts. Purinergic 2 receptors play an important role in cardiovascular function when they bind to extracellular nucleotides. In this study, the possible functional role of purinergic 2 receptors during MSC endothelial and smooth muscle differentiation was investigated. Methods and Results: Human MSCs were isolated from liposuction materials. Then, endothelial and smooth muscle-like cells were differentiated and characterized by specific markers via Reverse Transcriptase-PCR (RT-PCR), Western blot and immunochemical stainings. Interestingly, some purinergic 2 receptor subtypes were found to be differently regulated during these specific lineage commitments: P2Y4 and P2Y14 were involved in the early stage commitment while P2Y1 was the key player in controlling MSC differentiation towards either endothelial or smooth muscle cells. The administration of natural and artificial purinergic 2 receptor agonists and antagonists had a direct influence on these differentiations. Moreover, a feedback loop via exogenous extracellular nucleotides on these particular differentiations was shown by apyrase digest. Conclusions: Purinergic 2 receptors play a crucial role during the differentiation towards endothelial and smooth muscle cell lineages. Some highly selective and potent artificial purinergic 2 ligands can control hMSC differentiation, which might improve the use of adult stem cells in cardiovascular tissue engineering in the future.
Graph drawing with spring embedders employs a V x V computation phase over the graph's vertex set to compute repulsive forces. Here, the efficacy of forces diminishes with distance: a vertex can effectively only influence other vertices in a certain radius around its position. Therefore, the algorithm lends itself to an implementation using search data structures to reduce the runtime complexity. NVIDIA RT cores implement hierarchical tree traversal in hardware. We show how to map the problem of finding graph layouts with force-directed methods to a ray tracing problem that can subsequently be implemented with dedicated ray tracing hardware. With that, we observe speedups of 4x to 13x over a CUDA software implementation.
Extremophiles are optimal models in experimentally addressing questions about the effects of cosmic radiation on biological systems. The resistance to high charge energy (HZE) particles, and helium (He) ions and iron (Fe) ions (LET at 2.2 and 200 keV/µm, respectively, until 1000 Gy), of spores from two thermophiles, Bacillushorneckiae SBP3 and Bacilluslicheniformis T14, and two psychrotolerants, Bacillus sp. A34 and A43, was investigated. Spores survived He irradiation better, whereas they were more sensitive to Fe irradiation (until 500 Gy), with spores from thermophiles being more resistant to irradiations than psychrotolerants. The survived spores showed different germination kinetics, depending on the type/dose of irradiation and the germinant used. After exposure to He 1000 Gy, D-glucose increased the lag time of thermophilic spores and induced germination of psychrotolerants, whereas L-alanine and L-valine increased the germination efficiency, except alanine for A43. FTIR spectra showed important modifications to the structural components of spores after Fe irradiation at 250 Gy, which could explain the block in spore germination, whereas minor changes were observed after He radiation that could be related to the increased permeability of the inner membranes and alterations of receptor complex structures. Our results give new insights on HZE resistance of extremophiles that are useful in different contexts, including astrobiology.
Der Beitrag untersucht, wie ein Präsenzlabor durch ein Remote-Labor ergänzt undersetzt werden kann. Dazu wird das Laborpraktikum Digitaltechnik der Hochschule Bonn-Rhein-Sieg betrachtet, bei dem ein Remote-Labor Flexibilität bei der Versuchsdurchführung bietet und Versuche ermöglicht, die allein mit dem Präsenzlabor nicht möglich wären. Neben der Ergänzung der Präsenzversuche können Studie-rende das Praktikum auch komplett im Remote-Labor durchführen. Durch klare Anforderungen an die Erteilung eines Testats ist dies sowohl für sie als auch für Lehrende praktikabel zu handhaben. Rückmeldungen der Studierenden und Nutzungszahlen belegen die Akzeptanz des Remote-Labors. Dabei zeigt sich, dass die Studierenden sehr heterogen mit dem Remote-Labor umgehen: Einige von ihnen nutzen das Remote-Labor als zusätzliche Praktikumszeit für Versuche die auch im Präsenzlabor möglich wären; andere nutzen es als Erweiterung der Praktikumsmöglichkeit für Versuche, die nur im Remote-Labor möglich sind und wieder andere arbeiten intensiv im Remote-Labor und reichen auch das Praktikumsprotokoll elektronisch ein. Für Lehrende besteht über das Protokoll und die Auswertung der Nutzungsdaten ausreichende Sicherheit, um aktive Beteiligung am Praktikum zu testieren.