Blar i Bergen Open Research Archive på forfatter "Sakariassen, Per Øystein"

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    • Bevacizumab treatment induces metabolic adaptation toward anaerobic metabolism in glioblastomas 

      Fack, Fred; Espedal, Heidi; Keunen, Olivier; Golebiewska, Anna; Obad, Nina; Harter, Patrick N.; Mittelbronn, Michel; Bähr, Oliver; Weyerbrock, Astrid; Stuhr, Linda Elin Birkhaug; Miletic, Hrvoje; Sakariassen, Per Øystein; Stieber, Daniel; Rygh, Cecilie Brekke; Lund-Johansen, Morten; Zheng, Liang; Gottlieb, Eyal; Niclou, Simone P.; Bjerkvig, Rolf (Peer reviewed; Journal article, 2015-01)
      Anti-angiogenic therapy in glioblastoma (GBM) has unfortunately not led to the anticipated improvement in patient prognosis. We here describe how human GBM adapts to bevacizumab treatment at the metabolic level. By performing ...

    • Cancer stem cells as mediators of treatment resistance in brain tumors: Status and controversies 

      Sakariassen, Per Øystein; Immervoll, Heike; Chekenya, Martha (Peer reviewed; Journal article, 2007-11)
      Malignant primary brain tumors are characterized by a short median survival and an almost 100% tumorrelated mortality. Despite the addition of new chemotherapy regimes, the overall survival has improved marginally, and ...

    • A co-culture model with brain tumor-specific bioluminescence demonstrates astrocyte-induced drug resistance in glioblastoma 

      Yang, Ning; Yan, Tao; Zhu, Huaiyang; Liang, Xiao; Leiss, Lina; Sakariassen, Per Øystein; Skaftnesmo, Kai Ove; Huang, Bin; Costea, Daniela Elena; Enger, Per Øyvind; Li, Xingang; Wang, Jian (Peer reviewed; Journal article, 2014-10-04)
      Background: Although several studies suggest that stromal fibroblasts mediate treatment resistance in several cancer types, little is known about how tumor-associated astrocytes modulate the treatment response in brain ...

    • Expression of the "stem cell marker" CD133 in pancreas and pancreatic ductal adenocarcinomas 

      Immervoll, Heike; Hoem, Dag; Sakariassen, Per Øystein; Steffensen, Ole Johnny; Molven, Anders (Peer reviewed; Journal article, 2008-02-08)
      Background It has been suggested that a small population of cells with unique self-renewal properties and malignant potential exists in solid tumors. Such "cancer stem cells" have been isolated by flow cytometry, followed ...

    • Expression of the progenitor marker NG2/CSPG4 predicts poor survival and resistance to ionising radiation in glioblastoma 

      Svendsen, Agnete; Verhoeff, Joost J. C.; Immervoll, Heike; Brøgger, Jan C.; Kmiecik, Justyna; Poli, Aurélie; Netland, Inger A.; Planagumà, Jesús; Torsvik, Anja; Sakariassen, Per Øystein; Bjerkvig, Rolf; Enger, Per Øyvind; Tronstad, Karl Johan (Peer reviewed; Journal article, 2011-08-24)
      Glioblastoma (GBM) is a highly aggressive brain tumour, where patients respond poorly to radiotherapy and exhibit dismal survival outcomes. The mechanisms of radioresistance are not completely understood. However, cancer ...

    • Hyperoxic Treatment Induces Mesenchymal-to-Epithelial Transition in a Rat Adenocarcinoma Model 

      Moen, Ingrid; Øyan, Anne Margrete; Kalland, Karl-Henning; Tronstad, Karl Johan; Akslen, Lars A.; Chekenya, Martha; Sakariassen, Per Øystein; Reed, Rolf K.; Stuhr, Linda Elin Birkhaug (Peer reviewed; Journal article, 2009-07-28)
      Tumor hypoxia is relevant for tumor growth, metabolism and epithelial-to-mesenchymal transition (EMT). We report that hyperbaric oxygen (HBO) treatment induced mesenchymal-to-epithelial transition (MET) in a dimetyl-a-be ...

    • Lack of functional normalisation of tumour vessels following anti-angiogenic therapy in glioblastoma 

      Obad, Nina; Espedal, Heidi; Jirík, Radovan; Sakariassen, Per Øystein; Rygh, Cecilie Brekke; Lund-Johansen, Morten; Taxt, Torfinn; Niclou, Simone Pierrette; Bjerkvig, Rolf; Keunen, Olivier (Peer reviewed; Journal article, 2017)
      Neo-angiogenesis represents an important factor for the delivery of oxygen and nutrients to a growing tumour, and is considered to be one of the main pathodiagnostic features of glioblastomas (GBM). Anti-angiogenic therapy ...

    • A reproducible brain tumour model established from human glioblastoma biopsies 

      Wang, Jian; Miletic, Hrvoje; Sakariassen, Per Øystein; Huszthy, Peter Csaba; Jacobsen, Hege; Brekkå, Narve; Li, Xingang; Zhao, Peng; Mørk, Sverre; Chekenya, Martha; Bjerkvig, Rolf; Enger, Per Øyvind (Peer reviewed; Journal article, 2009-12-29)
      Background: Establishing clinically relevant animal models of glioblastoma multiforme (GBM) remains a challenge, and many commonly used cell line-based models do not recapitulate the invasive growth patterns of patient ...