Blar i Department of Biomedicine på forfatter "Enger, Per Øyvind"
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Bortezomib administered prior to temozolomide depletes MGMT, chemosensitizes glioblastoma with unmethylated MGMT promoter and prolongs animal survival
Rahman, Mohummad Aminur; Gras Navarro, Andrea; Brekke, Jorunn; Engelsen, Agnete; Bindesbøll, Christian; Sarowar, Shahin; Bahador, Marzieh; Bifulco, Ersilia; Goplen, Dorota; Waha, Andreas; Lie, Stein Atle; Gjertsen, Bjørn Tore; Selheim, Frode; Enger, Per Øyvind; Simonsen, Anne; Enger, Martha Chekenya (Peer reviewed; Journal article, 2019-08-15)Background Resistance to temozolomide (TMZ) is due in part to enhanced DNA repair mediated by high expression of O6-methyl guanine DNA methyltransferase (MGMT) that is often characterised by unmethylated promoter. Here, ... -
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 ... -
Dynamic contrast enhanced MRI detects early response to adoptive NK cellular immunotherapy targeting the NG2 proteoglycan in a rat model of glioblastoma
Brekke, Cecilie; Wang, Jian; Thuen, Marte; Gras Navarro, Andrea; Huuse-Røneid, Else Marie; Thorsen, Frits Alan; Poli, Aurélie; Zimmer, Jacques; Haraldseth, Olav; Lie, Stein Atle; Enger, Per Øyvind; Chekenya, Martha (Peer reviewed; Journal article, 2014-09-30)There are currently no established radiological parameters that predict response to immunotherapy. We hypothesised that multiparametric, longitudinal magnetic resonance imaging (MRI) of physiological parameters and ... -
Elevated CD3+ and CD8+ tumor-infiltrating immune cells correlate with prolonged survival in glioblastoma patients despite integrated immunosuppressive mechanisms in the tumor microenvironment and at the systemic level
Kmiecik, Justyna; Poli, Aurélie; Brons, Nicolaas H.C.; Waha, Andreas; Eide, Geir Egil; Enger, Per Øyvind; Zimmer, Jacques; Chekenya, Martha (Peer reviewed; Journal article, 2013-11-15)We characterized GBM patients' tumor and systemic immune contexture with aim to reveal themechanisms of immunological escape, their impact on patient outcome, and identify targets for immunotherapy. Increased CD3+ T-cell ... -
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 ... -
Gamma knife surgery as monotherapy with clinically relevant doses prolongs survival in a Human GBM Xenograft Model
Skeie, Bente Sandvei; Wang, Jian; Dodoo, Ernest; Heggdal, Jan Ingemann; Grønli, Janne; Sleire, Linda; Bragstad, Sidsel Marit; Ganz, Jeremy Christopher; Chekenya, Martha; Mørk, Sverre; Pedersen, Paal-Henning; Enger, Per Øyvind (Peer reviewed; Journal article, 2013)Object. Gamma knife surgery (GKS) may be used for recurring glioblastomas (GBMs). However, patients have then usually undergone multimodal treatment, which makes it difficult to specifically validate GKS independent of ... -
Gene expression in tumor cells and stroma in dsRed 4T1 tumors in eGFP-expressing mice with and without enhanced oxygenation
Moen, Ingrid; Jevne, Alison Charlotte; Wang, Jian; Kalland, Karl-Henning; Chekenya, Martha; Akslen, Lars A.; Sleire, Linda; Enger, Per Øyvind; Reed, Rolf K.; Øyan, Anne Margrete; Stuhr, Linda Elin Birkhaug (Peer reviewed; Journal article, 2012-01-17)Background The tumor microenvironment is pivotal in tumor progression. Thus, we aimed to develop a mammary tumor model to elucidate molecular characteristics in the stroma versus the tumor cell compartment by global gene ... -
Neuronal markers are expressed in human gliomas and NSE knockdown sensitizes glioblastoma cells to radiotherapy and temozolomide
Yan, Tao; Skaftnesmo, Kai Ove; Leiss, Lina; Sleire, Linda; Wang, Jian; Li, Xingang; Enger, Per Øyvind (Peer reviewed; Journal article, 2011-12-20)Background: Expression of neuronal elements has been identified in various glial tumors, and glioblastomas (GBMs) with neuronal differentiation patterns have reportedly been associated with longer survival. However, the ... -
NK cells with KIR2DS2 immunogenotype have a functional activation advantage to efficiently kill glioblastoma and prolong animal survival
Gras Navarro, Andrea; Kmiecik, Justyna; Leiss, Lina Wik; Zelkowski, Mateusz; Engelsen, Agnete; Bruserud, Øystein; Zimmer, Jacques; Enger, Per Øyvind; Chekenya, Martha (Peer reviewed; Journal article, 2014-12)Glioblastomas (GBMs) are lethal brain cancers that are resistant to current therapies. We investigated the cytotoxicity of human allogeneic NK cells against patient-derived GBM in vitro and in vivo, as well as mechanisms ... -
A novel GFP nude rat model to investigate tumor-stroma interactions
Yang, Ning; Huang, Bin; Tsinkalovsky, Oleg; Brekkå, Narve; Zhu, Huaiyang; Leiss, Lina; Enger, Per Øyvind; Li, Xingang; Wang, Jian (Peer reviewed; Journal article, 2014-12-21)Backgroud: A key strategy for the study of the tumor microenvironment is to implant human tumor cells in an immunodeficient rodent strain ubiquitously expressing a fluorescent marker. Here, a novel nude rat expressing a ... -
Pretreatment of glioblastoma with bortezomib potentiates natural killer cell cytotoxicity through TRAIL/DR5 mediated apoptosis and prolongs animal survival
Gras Navarro, Andrea; Espedal, Heidi; Vareecal Joseph, Justin; Moncho, Laura Trachsel; Bahador, Marzieh; Gjertsen, Bjørn Tore; Kristoffersen, Einar Klæboe; Simonsen, Anne; Miletic, Hrvoje; Enger, Per Øyvind; Rahman, Mohummad Aminur; Enger, Martha Chekenya (Peer reviewed; Journal article, 2019-07-17)Background: Natural killer (NK) cells are potential effectors in anti-cancer immunotherapy; however only a subset potently kills cancer cells. Here, we examined whether pretreatment of glioblastoma (GBM) with the proteasome ... -
Rapid adherence to collagen IV enriches for tumour initiating cells in oral cancer.
Liang, Xiao; Osman, Tarig Al-Hadi; Sapkota, Dipak; Neppelberg, Evelyn; Lybak, Stein; Liavaag, Per Gunnar; Johannessen, Anne Christine; Jacobsen, Hege Karine; Enger, Per Øyvind; Costea, Daniela Elena; Wang, Jian (Peer reviewed; Journal article, 2014-12)Background: Although several approaches for identification and isolation of carcinoma cells with tumour initiating properties have been established, enrichment of a population of pure and viable tumour-initiating cells ... -
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 ... -
The styryl benzoic acid derivative DC10 potentiates radiotherapy by targeting the xCT-glutathione axis
Sarowar, Shahin; Cirillo, Davide; Játiva, Pablo; Nilsen, Mette Hartmark; Otragane, Sarah-Muheha Anni; Heggdal, Jan Ingemann; Selheim, Frode; Ceña, Valentín; Bjørsvik, Hans-René; Enger, Per Øyvind (Journal article; Peer reviewed, 2022)Metastatic tumors with moderate radiosensitivity account for most cancer-related deaths, highlighting the limitations of current radiotherapy regimens. The xCT-inhibitor sulfasalazine (SAS) sensitizes cancer cells to ... -
Surgical debulking promotes recruitment of macrophages and triggers glioblastoma phagocytosis in combination with CD47 blocking immunotherapy
Zhu, Huaiyang; Leiss, Lina Wik; Yang, Ning; Rygh, Cecilie Brekke; Mitra, Siddharta S.; Cheshier, Samuel H.; Weissman, Irving L.; Huang, Bin; Miletic, Hrvoje; Bjerkvig, Rolf; Enger, Per Øyvind; Li, Xingang; Wang, Jian (Peer reviewed; Journal article, 2017)Surgical resection is a standard component of treatment in the clinical management of patients with glioblastoma multiforme (GBM). However, experimental therapies are rarely investigated in the context of tumor debulking ... -
Targeting glioblastoma with NK cells and mAb against NG2/CSPG4 prolongs animal survival
Poli, Aurélie; Wang, Jian; Domingues, Olivia; Planagumà, Jesús; Yan, Tao; Rygh, Cecilie Brekke; Skaftnesmo, Kai Ove; Thorsen, Frits Alan; McCormack, Emmet; Hentges, François; Pedersen, Paal-Henning; Zimmer, Jacques; Enger, Per Øyvind; Chekenya, Martha (Peer reviewed; Journal article, 2013-09-09)Glioblastoma (GBM) is the most malignant brain tumor where patients’ survival is only 14.6 months, despite multimodal therapy with debulking surgery, concurrent chemotherapy and radiotherapy. There is an urgent, unmet need ... -
Targeting the NG2/CSPG4 Proteoglycan Retards Tumour Growth and Angiogenesis in Preclinical Models of GBM and Melanoma
Wang, Jian; Svendsen, Agnete; Kmiecik, Justyna; Immervoll, Heike; Skaftnesmo, Kai Ove; Planagumà, Jesús; Reed, Rolf K.; Bjerkvig, Rolf; Miletic, Hrvoje; Enger, Per Øyvind; Rygh, Cecilie Brekke; Chekenya, Martha (Peer reviewed; Journal article, 2011-07-29)Aberrant expression of the progenitor marker Neuron-glia 2 (NG2/CSPG4) or melanoma proteoglycan on cancer cells and angiogenic vasculature is associated with an aggressive disease course in several malignancies including ... -
Tumour-associated glial host cells display a stem-like phenotype with a distinct gene expression profile and promote growth of GBM xenografts
Leiss, Lina Wik; Mutlu, Ercan; Øyan, Anne Margrete; Yan, Tao; Tsinkalovsky, Oleg; Sleire, Linda; Petersen, Kjell; Rahman, Mohummad Aminur; Johannessen, Mireille Kayitesi; Mitra, Siddharta S.; Jacobsen, Hege; Talasila, Krishna Mukharji; Miletic, Hrvoje; Jonassen, Inge; Li, Xingang; Brons, Nicolas H.C.; Kalland, Karl-Henning; Wang, Jian; Enger, Per Øyvind (Peer reviewed; Journal article, 2017-02-07)Background: Little is known about the role of glial host cells in brain tumours. However, supporting stromal cells have been shown to foster tumour growth in other cancers. Methods: We isolated stromal cells from patient-derived ... -
U-251 revisited: genetic drift and phenotypic consequences of long-term cultures of glioblastoma cells
Torsvik, Anja; Stieber, Daniel; Enger, Per Øyvind; Golebiewska, Anna; Molven, Anders; Svendsen, Agnete; Westermark, Bengt; Niclou, Simone P.; Olsen, Thale Kristin; Chekenya, PhD, Dr Philos, Dr. Martha; Bjerkvig, Rolf (Peer reviewed; Journal article, 2014-08)It is well known that in vitro subculture represents a selection pressure on cell lines, and over time this may result in a genetic drift in the cancer cells. In addition, long-term cultures harbor the risk of cross-contamination ...