@article{SalvadorKoepplHoermannetal.2023, author = {Salvador, Ellaine and K{\"o}ppl, Theresa and H{\"o}rmann, Julia and Sch{\"o}nh{\"a}rl, Sebastian and Bugaeva, Polina and Kessler, Almuth F. and Burek, Malgorzata and Ernestus, Ralf-Ingo and L{\"o}hr, Mario and Hagemann, Carsten}, title = {Tumor Treating Fields (TTFields) induce cell junction alterations in a human 3D in vitro model of the blood-brain barrier}, series = {Pharmaceutics}, volume = {15}, journal = {Pharmaceutics}, number = {1}, issn = {1999-4923}, doi = {10.3390/pharmaceutics15010185}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-304830}, year = {2023}, abstract = {In a recent study, we showed in an in vitro murine cerebellar microvascular endothelial cell (cerebEND) model as well as in vivo in rats that Tumor-Treating Fields (TTFields) reversibly open the blood-brain barrier (BBB). This process is facilitated by delocalizing tight junction proteins such as claudin-5 from the membrane to the cytoplasm. In investigating the possibility that the same effects could be observed in human-derived cells, a 3D co-culture model of the BBB was established consisting of primary microvascular brain endothelial cells (HBMVEC) and immortalized pericytes, both of human origin. The TTFields at a frequency of 100 kHz administered for 72 h increased the permeability of our human-derived BBB model. The integrity of the BBB had already recovered 48 h post-TTFields, which is earlier than that observed in cerebEND. The data presented herein validate the previously observed effects of TTFields in murine models. Moreover, due to the fact that human cell-based in vitro models more closely resemble patient-derived entities, our findings are highly relevant for pre-clinical studies.}, language = {en} } @article{MorgensternPeikertLuebbertetal.2021, author = {Morgenstern, Marcel and Peikert, Christian D. and L{\"u}bbert, Philipp and Suppanz, Ida and Klemm, Cinzia and Alka, Oliver and Steiert, Conny and Naumenko, Nataliia and Schendzielorz, Alexander and Melchionda, Laura and M{\"u}hlh{\"a}user, Wignand W. D. and Knapp, Bettina and Busch, Jakob D. and Stiller, Sebastian B. and Dannenmaier, Stefan and Lindau, Caroline and Licheva, Mariya and Eickhorst, Christopher and Galbusera, Riccardo and Zerbes, Ralf M. and Ryan, Michael T. and Kraft, Claudine and Kozjak-Pavlovic, Vera and Drepper, Friedel and Dennerlein, Sven and Oeljeklaus, Silke and Pfanner, Nikolaus and Wiedemann, Nils and Warscheid, Bettina}, title = {Quantitative high-confidence human mitochondrial proteome and its dynamics in cellular context}, series = {Cell Metabolism}, volume = {33}, journal = {Cell Metabolism}, doi = {10.1016/j.cmet.2021.11.001}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-371114}, pages = {2464-2483}, year = {2021}, abstract = {Mitochondria are key organelles for cellular energetics, metabolism, signaling, and quality control and have been linked to various diseases. Different views exist on the composition of the human mitochondrial proteome. We classified >8,000 proteins in mitochondrial preparations of human cells and defined a mitochondrial high-confidence proteome of >1,100 proteins (MitoCoP). We identified interactors of translocases, respiratory chain, and ATP synthase assembly factors. The abundance of MitoCoP proteins covers six orders of magnitude and amounts to 7\% of the cellular proteome with the chaperones HSP60-HSP10 being the most abundant mitochondrial proteins. MitoCoP dynamics spans three orders of magnitudes, with half-lives from hours to months, and suggests a rapid regulation of biosynthesis and assembly processes. 460 MitoCoP genes are linked to human diseases with a strong prevalence for the central nervous system and metabolism. MitoCoP will provide a high-confidence resource for placing dynamics, functions, and dysfunctions of mitochondria into the cellular context.}, language = {en} } @article{KhanSuhasiniBanerjeeetal.2014, author = {Khan, Irfan and Suhasini, Avvaru N. and Banerjee, Taraswi and Sommers, Joshua A. and Kaplan, Daniel L. and Kuper, Jochen and Kisker, Caroline and Brosh, Jr., Robert M.}, title = {Impact of Age-Associated Cyclopurine Lesions on DNA Repair Helicases}, series = {PLOS ONE}, volume = {9}, journal = {PLOS ONE}, number = {11}, doi = {10.1371/journal.pone.0113293}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-114635}, pages = {e113293}, year = {2014}, abstract = {8,5' cyclopurine deoxynucleosides (cPu) are locally distorting DNA base lesions corrected by nucleotide excision repair (NER) and proposed to play a role in neurodegeneration prevalent in genetically defined Xeroderma pigmentosum (XP) patients. In the current study, purified recombinant helicases from different classifications based on sequence homology were examined for their ability to unwind partial duplex DNA substrates harboring a single site-specific cPu adduct. Superfamily (SF) 2 RecQ helicases (RECQ1, BLM, WRN, RecQ) were inhibited by cPu in the helicase translocating strand, whereas helicases from SF1 (UvrD) and SF4 (DnaB) tolerated cPu in either strand. SF2 Fe-S helicases (FANCJ, DDX11 (ChlR1), DinG, XPD) displayed marked differences in their ability to unwind the cPu DNA substrates. Archaeal Thermoplasma acidophilum XPD (taXPD), homologue to the human XPD helicase involved in NER DNA damage verification, was impeded by cPu in the non-translocating strand, while FANCJ was uniquely inhibited by the cPu in the translocating strand. Sequestration experiments demonstrated that FANCJ became trapped by the translocating strand cPu whereas RECQ1 was not, suggesting the two SF2 helicases interact with the cPu lesion by distinct mechanisms despite strand-specific inhibition for both. Using a protein trap to simulate single-turnover conditions, the rate of FANCJ or RECQ1 helicase activity was reduced 10-fold and 4.5-fold, respectively, by cPu in the translocating strand. In contrast, single-turnover rates of DNA unwinding by DDX11 and UvrD helicases were only modestly affected by the cPu lesion in the translocating strand. The marked difference in effect of the translocating strand cPu on rate of DNA unwinding between DDX11 and FANCJ helicase suggests the two Fe-S cluster helicases unwind damaged DNA by distinct mechanisms. The apparent complexity of helicase encounters with an unusual form of oxidative damage is likely to have important consequences in the cellular response to DNA damage and DNA repair.}, language = {en} }