@article{WestermaierLinsenmannHomolaetal.2016, author = {Westermaier, Thomas and Linsenmann, Thomas and Homola, Gy{\"o}rgy A. and Loehr, Mario and Stetter, Christian and Willner, Nadine and Ernestus, Ralf-Ingo and Soymosi, Laszlo and Vince, Giles H.}, title = {3D rotational fluoroscopy for intraoperative clip control in patients with intracranial aneurysms - assessment of feasibility and image quality}, series = {BMC Medical Imaging}, volume = {16}, journal = {BMC Medical Imaging}, number = {30}, doi = {10.1186/s12880-016-0133-0}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-146381}, year = {2016}, abstract = {Background Mobile 3D fluoroscopes have become increasingly available in neurosurgical operating rooms. In this series, the image quality and value of intraoperative 3D fluoroscopy with intravenous contrast agent for the evaluation of aneurysm occlusion and vessel patency after clip placement was assessed in patients who underwent surgery for intracranial aneurysms. Materials and methods Twelve patients were included in this retrospective analysis. Prior to surgery, a 360° rotational fluoroscopy scan was performed without contrast agent followed by another scan with 50 ml of intravenous iodine contrast agent. The image files of both scans were transferred to an Apple PowerMac® workstation, subtracted and reconstructed using OsiriX® free software. The procedure was repeated after clip placement. Both image sets were compared for assessment of aneurysm occlusion and vessel patency. Results Image acquisition and contrast administration caused no adverse effects. Image quality was sufficient to follow the patency of the vessels distal to the clip. Metal artifacts reduce the assessability of the immediate vicinity of the clip. Precise image subtraction and post-processing can reduce metal artifacts and make the clip-site assessable and depict larger neck-remnants. Conclusion This technique quickly supplies images at adequate quality to evaluate distal vessel patency after aneurysm clipping. Significant aneurysm remnants may be depicted as well. As it does not require visual control of all vessels that are supposed to be evaluated intraoperatively, this technique may be complementary to other intraoperative tools like indocyanine green videoangiography and micro-Doppler, especially for the assessment of larger aneurysms. At the momentary state of this technology, it cannot replace postoperative conventional angiography. However, 3D fluoroscopy and image post-processing are young technologies. Further technical developments are likely to result in improved image quality.}, language = {en} } @article{DietlSchwinnDietletal.2016, author = {Dietl, Sebastian and Schwinn, Stefanie and Dietl, Susanne and Riedl, Simone and Deinlein, Frank and Rutkowski, Stefan and von Bueren, Andre O. and Krauss, J{\"u}rgen and Schweitzer, Tilmann and Vince, Giles H. and Picard, Daniel and Eyrich, Matthias and Rosenwald, Andreas and Ramaswamy, Vijay and Taylor, Michael D. and Remke, Marc and Monoranu, Camelia M. and Beilhack, Andreas and Schlegel, Paul G. and W{\"o}lfl, Matthias}, title = {MB3W1 is an orthotopic xenograft model for anaplastic medulloblastoma displaying cancer stem cell- and Group 3-properties}, series = {BMC Cancer}, volume = {16}, journal = {BMC Cancer}, number = {115}, doi = {10.1186/s12885-016-2170-z}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-145877}, year = {2016}, abstract = {Background Medulloblastoma is the most common malignant brain tumor in children and can be divided in different molecular subgroups. Patients whose tumor is classified as a Group 3 tumor have a dismal prognosis. However only very few tumor models are available for this subgroup. Methods We established a robust orthotopic xenograft model with a cell line derived from the malignant pleural effusions of a child suffering from a Group 3 medulloblastoma. Results Besides classical characteristics of this tumor subgroup, the cells display cancer stem cell characteristics including neurosphere formation, multilineage differentiation, CD133/CD15 expression, high ALDH-activity and high tumorigenicity in immunocompromised mice with xenografts exactly recapitulating the original tumor architecture. Conclusions This model using unmanipulated, human medulloblastoma cells will enable translational research, specifically focused on Group 3 medulloblastoma.}, language = {en} } @article{LinsenmannMonoranuVinceetal.2014, author = {Linsenmann, Thomas and Monoranu, Camelia M. and Vince, Giles H. and Westermaier, Thomas and Hagemann, Carsten and Kessler, Almuth F. and Ernestus, Ralf-Ingo and L{\"o}hr, Mario}, title = {Long-term tumor control of spinal dissemination of cerebellar glioblastoma multiforme by combined adjuvant bevacizumab antibody therapy: a case report}, doi = {10.1186/1756-0500-7-496}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-110536}, year = {2014}, abstract = {Background Glioblastoma multiforme located in the posterior fossa is extremely rare with a frequency up to 3.4\%. Compared with glioblastoma of the hemispheres the prognosis of infratentorial glioblastoma seems to be slightly better. Absence of brainstem invasion and low expression rates of epidermal growth factor receptor are described as factors for long-time survival due to the higher radiosensitivity of these tumors. Case presentation In this case study, we report a German female patient with an exophytic glioblastoma multiforme arising from the cerebellar tonsil and a secondary spinal manifestation. Furthermore, the tumor showed no O (6)-Methylguanine-DNA methyltransferase promotor-hypermethylation and no isocitrate dehydrogenase 1 mutations. All these signs are accompanied by significantly shorter median overall survival. A long-term tumor control of the spinal metastases was achieved by a combined temozolomide/bevacizumab and irradiation therapy, as part of a standard care administered by the treating physician team. Conclusion To our knowledge this is the first published case of a combined cerebellar exophytic glioblastoma with a subsequent solid spinal manifestation. Furthermore this case demonstrates a benefit undergoing this special adjuvant therapy regime in terms of overall survival. Due to the limited overall prognosis of the disease, spinal manifestations of glioma are rarely clinically relevant. The results of our instructive case, however, with a positive effect on both life quality and survival warrant treating future patients in the frame of a prospective clinical study.}, language = {en} } @article{WestermaierStetterKunzeetal.2013, author = {Westermaier, Thomas and Stetter, Christian and Kunze, Ekkehard and Willner, Nadine and Raslan, Furat and Vince, Giles H. and Ernestus, Ralf-Ingo}, title = {Magnesium treatment for neuroprotection in ischemic diseases of the brain}, series = {Experimental and Translational Stroke Medicine}, journal = {Experimental and Translational Stroke Medicine}, doi = {10.1186/2040-7378-5-6}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-96729}, year = {2013}, abstract = {This article reviews experimental and clinical data on the use of magnesium as a neuroprotective agent in various conditions of cerebral ischemia. Whereas magnesium has shown neuroprotective properties in animal models of global and focal cerebral ischemia, this effect could not be reproduced in a large human stroke trial. These conflicting results may be explained by the timing of treatment. While treatment can be started before or early after ischemia in experimental studies, there is an inevitable delay of treatment in human stroke. Magnesium administration to women at risk for preterm birth has been investigated in several randomized controlled trials and was found to reduce the risk of neurological deficits for the premature infant. Postnatal administration of magnesium to babies after perinatal asphyxia has been studied in a number of controlled clinical trials. The results are promising but the trials have, so far, been underpowered. In aneurysmal subarachnoid hemorrhage (SAH), cerebral ischemia arises with the onset of delayed cerebral vasospasm several days after aneurysm rupture. Similar to perinatal asphyxia in impending preterm delivery, treatment can be started prior to ischemia. The results of clinical trials are conflicting. Several clinical trials did not show an additive effect of magnesium with nimodipine, another calcium antagonist which is routinely administered to SAH patients in many centers. Other trials found a protective effect after magnesium therapy. Thus, it may still be a promising substance in the treatment of secondary cerebral ischemia after aneurysmal SAH. Future prospects of magnesium therapy are discussed.}, language = {en} } @article{HagemannAnackerErnestusetal.2012, author = {Hagemann, Carsten and Anacker, Jelena and Ernestus, Ralf-Ingo and Vince, Giles H.}, title = {A complete compilation of matrix metalloproteinase expression in human malignant gliomas}, series = {World Journal of Clinical Oncology}, volume = {3}, journal = {World Journal of Clinical Oncology}, number = {5}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-123982}, pages = {67-79}, year = {2012}, abstract = {Glioblastomas are characterized by an aggressive local growth pattern, a marked degree of invasiveness and poor prognosis. Tumor invasiveness is facilitated by the increased activity of proteolytic enzymes which are involved in destruction of the extracellular matrix of the surrounding healthy brain tissue. Elevated levels of matrix metalloproteinases (MMPs) were found in glioblastoma (GBM) cell-lines, as well as in GBM biopsies as compared with low-grade astrocytoma (LGA) and normal brain samples, indicating a role in malignant progression. A careful review of the available literature revealed that both the expression and role of several of the 23 human MMP proteins is controversely discussed and for some there are no data available at all. We therefore screened a panel of 15 LGA and 15 GBM biopsy samples for those MMPs for which there is either no, very limited or even contradictory data available. Hence, this is the first complete compilation of the expression pattern of all 23 human MMPs in astrocytic tumors. This study will support a better understanding of the specific expression patterns and interaction of proteolytic enzymes in malignant human glioma and may provide additional starting points for targeted patient therapy.}, language = {en} } @article{HagemannAnackerHaasetal.2010, author = {Hagemann, Carsten and Anacker, Jelena and Haas, Stefanie and Riesner, Daniela and Sch{\"o}mig, Beate and Ernestus, Ralf-Ingo and Vince, Giles H.}, title = {Comparative expression pattern of Matrix-Metalloproteinases in human glioblastoma cell-lines and primary cultures}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-67980}, year = {2010}, abstract = {Background: Glioblastomas (GBM), the most frequent malignant brain tumors in adults, are characterized by an aggressive local growth pattern and highly invasive tumor cells. This invasion is facilitated by expression of matrix metalloproteinases (MMPs), a family of zinc-dependent endopeptidases. They mediate the degradation of protein components of the extracellular matrix. Twenty-three family members are known. Elevated levels of several of them have been reported in GBM. GBM cell-lines are used for in vitro studies of cell migration and invasion. Therefore, it is essential to know their MMP expression patterns. Only limited data for some of the cell-lines are published, yet. To fill the gaps in our knowledge would help to choose suitable model systems for analysis of regulation and function of MMPs during GBM tumorigenesis, cell migration and invasion. Findings: We analysed MMP-1, -8, -9, -10, -11, -13, -17, -19, -20, -21, -23, -24, -26, -27, and MMP-28 expression in seven GBM cell-lines (SNB-19, GaMG, U251, U87, U373, U343, U138) and in four primary cell cultures by semiquantitative RT-PCR, followed changes in the MMP expression pattern with increasing passages of cell culture and examined the influence of TNF-a and TGF-b1 stimulation on the expression of selected MMPs in U251 and U373 cells. MMP-13, -17, -19 and -24 were expressed by all analyzed cell-lines, whereas MMP-20 and MMP-21 were not expressed by any of them. The other MMPs showed variable expression, which was dependent on passage number. Primary cells displayed a similar MMP-expression pattern as the cell-lines. In U251 and U373 cells expression of MMP-9 and MMP-19 was stimulated by TNF-a. MMP-1 mRNA expression was significantly increased in U373 cells, but not in U251 cells by this cytokine. Whereas TGF-b1 had no impact on MMP expression in U251 cells, it significantly induced MMP-11 and MMP-24 expression in U373 cells. Conclusions: Literature-data and our own results suggest that the expression pattern of MMPs is highly variable, dependent on the cell-line and the cell-culture conditions used and that also regulation of MMP expression by cytokines is cell-line dependent. This is of high impact for the transfer of cell-culture experiments to clinical implementation.}, subject = {Metalloproteinasen}, language = {en} }