Browsing Bergen Open Research Archive by Author "Karlsen, Tom Hemming"

Now showing items 1-20 of 22

    • Abundant Genetic Overlap between Blood Lipids and Immune-Mediated Diseases Indicates Shared Molecular Genetic Mechanisms 

      Andreassen, Ole Andreas; Desikan, Rahul S.; Wang, Yunpeng; Thompson, Wesley K.; Schork, Andrew J.; Zuber, Verena; Doncheva, Nadezhda T.; Ellinghaus, E.va; Mattingsdal, Morten; Franke, Andre; Lie, Benedicte. A.; Mills, Ian Geoffrey; Aukrust, Pål; McEvoy, Linda K.; Djurovic, Srdjan; Karlsen, Tom Hemming; Dale, Anders M. (Peer reviewed; Journal article, 2015-04-08)
      Epidemiological studies suggest a relationship between blood lipids and immune-mediated diseases, but the nature of these associations is not well understood. We used genome-wide association studies (GWAS) to investigate ...

    • Algebraic topology-based machine learning using MRI predicts outcomes in primary sclerosing cholangitis 

      Singh, Yashbir; Jons, William A.; Eaton, John E.; Vesterhus, Mette Nåmdal; Karlsen, Tom Hemming; Bjørk, Ida; Abildgaard, Andreas; Jørgensen, Kristin Kaasen; Folseraas, Trine; Little, Derek; Gulamhusein, Aliya F.; Petrovic, Kosta; Negård, Anne; Conte, Gian Marco; Sobek, Joseph D.; Jagtap, Jaidip; Venkatesh, Sudhakar K.; Gores, Gregory J.; LaRusso, Nicholas F.; Lazaridis, Konstantinos N.; Erickson, Bradley J. (Journal article; Peer reviewed, 2022)
      Background: Primary sclerosing cholangitis (PSC) is a chronic cholestatic liver disease that can lead to cirrhosis and hepatic decompensation. However, predicting future outcomes in patients with PSC is challenging. Our ...

    • Altered Gut Microbial Metabolism of Essential Nutrients in Primary Sclerosing Cholangitis 

      Kummen, Martin; Thingholm, Louise B.; Rühlemann, Malte C.; Holm, Kristian; Hansen, Simen Hyll; Moitinho-Silva, Lucas; Liwinski, Timur; Zenouzi, Roman; Larsen, Christopher Storm; Midttun, Øivind; McCann, Adrian; Ueland, Per Magne; Høivik, Marte Lie; Vesterhus, Mette; Trøseid, Marius; Laudes, Matthias; Lieb, Wolfgang; Karlsen, Tom Hemming; Bang, Corinna; Schramm, Christoph; Franke, Andre; Hov, Johannes Espolin Roksund (Journal article; Peer reviewed, 2021)
      Background & Aims To influence host and disease phenotype, compositional microbiome changes, which have been demonstrated in patients with primary sclerosing cholangitis (PSC), must be accompanied by functional changes. ...

    • Associations of neopterin and kynurenine–tryptophan ratio with survival in primary sclerosing cholangitis 

      Dhillon, Amandeep Kaur; Rupp, Christian; Bergquist, Annika; Voitl, Robert; Folseraas, Trine; Trøseid, Marius; Midttun, Øivind; Ueland, Per Magne; Karlsen, Tom Hemming; Vesterhus, Mette Nåmdal; Kummen, Martin; Hov, Johannes Espolin Roksund (Journal article; Peer reviewed, 2021)
      Background and aims Biomarkers of inflammation may be of clinical utility in primary sclerosing cholangitis (PSC). We aimed to investigate the interferon gamma-related biomarkers neopterin and kynurenine–tryptophanratio ...

    • Autotaxin activity predicts transplant-free survival in primary sclerosing cholangitis 

      Dhillon, Amandeep Kaur; Kremer, Andreas E.; Kummen, Martin; Boberg, Kirsten Muri; Elferink, Ronald P. Oude; Karlsen, Tom Hemming; Beuers, Ulrich; Vesterhus, Mette; Hov, Johannes Espolin Roksund (Peer reviewed; Journal article, 2019-06-11)
      Autotaxin has been associated with liver disease severity and transplant-free survival. This study aimed to validate autotaxin as a biomarker in two cohorts of Norwegian large-duct PSC patients, one discovery panel (n=165) ...

    • Bile Acid Profiles in Primary Sclerosing Cholangitis and their Ability to Predict Hepatic Decompensation 

      Mousa, Omar Y; Juran, Brian D; McCauley, Bryan M.; Vesterhus, Mette; Folseraas, Trine; Turgeon, Coleman T.; Ali, Ahmad; Schlicht, Erik M; Atkinson, Elizabeth J; Hu, Chang; Harnois, Denise; Carey, Elizabeth J; Gossard, Andrea A; Oglesbee, Devin; Eaton, John E; LaRusso, Nicholas F.; Gores, Gregory J.; Karlsen, Tom Hemming; Lazaridis, Konstantinos N. (Journal article; Peer reviewed, 2021)
      Background and Aims: Altered bile acid (BA) homeostasis is an intrinsic facet of cholestatic liver diseases, but clinical usefulness of plasma BA assessment in primary sclerosing cholangitis (PSC) remains understudied. We ...

    • Circulating Macrophage Activation Markers Predict Transplant-Free Survival in Patients With Primary Sclerosing Cholangitis 

      Bossen, Lars; Vesterhus, Mette Nåmdal; Hov, Johannes Espolin Roksund; Färkkilä, Martti; Rosenberg, William; Møller, Holger J.; Boberg, Kirsten Muri; Karlsen, Tom Hemming; Grønbæk, Henning (Journal article; Peer reviewed, 2021)
      INTRODUCTION: Primary sclerosing cholangitis (PSC) is a progressive liver disease characterized by bile duct inflammation and fibrosis. The role of macrophages in PSC development and progression is less studied. Macrophage ...

    • Circulating markers of gut barrier function associated with disease severity in primary sclerosing cholangitis 

      Dhillon, Amandeep Kaur; Kummen, Martin; Trøseid, Marius; Åkra, Sissel; Liaskou, Evaggelia; Moum, Bjørn; Vesterhus, Mette; Karlsen, Tom Hemming; Seljeflot, Ingebjørg; Hov, Johannes Espolin Roksund (Peer reviewed; Journal article, 2019-02)
      Background & Aims: One important hypothesis in primary sclerosing cholangitis pathophysiology suggests that bacterial products from an inflamed leaky gut lead to biliary inflammation. We aimed to investigate whether ...

    • Clinical and biochemical impact of vitamin B6 deficiency in primary sclerosing cholangitis before and after liver transplantation 

      Braadland, Peder Rustøen; Bergquist, Annika; Kummen, Martin; Bossen, Lars; Engesæter, Lise Katrine; Reims, Henrik Mikael; Bjørk, Ida Torunn; Grzyb, Krzysztof; Abildgaard, Andreas; Småstuen, Milada Cvancarova; Folseraas, Trine; Trøseid, Marius; Ulvik, Arve; Ueland, Per Magne; Melum, Espen; Line, Pål Dag; Høivik, Marte Lie; Grønbæk, Henning; Karlsen, Tom Hemming; Vesterhus, Mette Nåmdal; Hov, Johannes Espolin Roksund (Journal article; Peer reviewed, 2023)
      Background and aims We previously demonstrated that people with primary sclerosing cholangitis (PSC) had reduced gut microbial capacity to produce active vitamin B6 (pyridoxal 5’-phosphate [PLP]), which corresponded to ...

    • Comprehensive assessment of ECM turnover using serum biomarkers establishes PBC as a high-turnover autoimmune liver disease 

      Vesterhus, Mette; Nielsen, Mette; Hov, Johannes Espolin Roksund; Saffioti, Francesca; Manon-Jensen, Tina; Leeming, Diana Julie; Moum, Bjørn; Boberg, Kirsten Muri; Pinzani, Massimo; Karlsen, Tom Hemming; Karsdal, Morten A; Thorburn, Douglas (Journal article; Peer reviewed, 2021)
      Background & Aims: Primary sclerosing cholangitis (PSC), primary biliary cholangitis (PBC) and autoimmune hepatitis (AIH) are phenotypically distinct autoimmune liver diseases that progress to cirrhosis and liver failure; ...

    • Detailed stratified GWAS analysis for severe COVID-19 in four European populations 

      Degenhardt, Frauke; Ellinghaus, David; Juzenas, Simonas; Lerga-Jaso, Jon; Wendorff, Mareike; Maya-Miles, Douglas; Uellendahl-Werth, Florian; ElAbd, Hesham; Lenning, Ole Bernt; Myhre, Ronny; Vadla, May Sissel; Holten, Aleksander Rygh; Kildal, Anders Benjamin; Lind, Andreas; Dyrhol-Riise, Anne Ma; Hoff, Dag Arne Lihaug; Müller, Fredrik; Solligård, Erik; Holter, Jan Cato; Afset, Jan Egil; Damås, Jan Kristian; Bergan, Jonas; Risnes, Kari; Muller, Karl Erik; Tonby, Kristian; Heggelund, Lars; Gustad, Lise Tuset; Grimsrud, Marit Mæhle; Dudman, Susanne Gjeruldsen; Folseraas, Trine; Skogen, Vegard; Hov, Johannes Espolin Roksund; Karlsen, Tom Hemming; Rühlemann, Malte C.; Arora, Jatin; Özer, Onur; Wacker, Eike Matthias; Wienbrandt, Lars; Ortiz, Aron Blandino; de Salazar, Adolfo; Chercoles, Adolfo Garrido; Palom, Adriana; Ruiz, Agustin; Garzia-Fernandez, Alba-Estela; Blanco-Grau, Albert; Mantovani, Alberto; Zanella, Alberto; Mayer, Alena; Bandera, Alessandra; Franke, Andre (Journal article; Peer reviewed, 2022)
      Given the highly variable clinical phenotype of Coronavirus disease 2019 (COVID-19), a deeper analysis of the host genetic contribution to severe COVID-19 is important to improve our understanding of underlying disease ...

    • Enhanced liver fibrosis test predicts transplant-free survival in primary sclerosing cholangitis, a multi-centre study 

      de Vries, Elisabeth M.G.; Färkkilä, Martti; Milkiewicz, Piotr; Hov, Johannes Espolin Roksund; Eksteen, Bertus; Thorburn, Douglas; Chazouillères, Olivier; Pares, Albert; Nygård, Ståle; Gilja, Odd Helge; Wunsch, Ewa; Invernizzi, Pietro; Carbone, Marco; Bernuzzi, Francesca; Boberg, Kirsten Muri; Røsjø, Helge; Rosenberg, William; Beuers, Ulrich H.; Ponsioen, Cyriel Y.; Karlsen, Tom Hemming; Vesterhus, Mette (Peer reviewed; Journal article, 2017-10)
      Background & Aims: Biomarkers reflecting disease activity and prognosis in primary sclerosing cholangitis (PSC) have not been firmly established. Enhanced liver fibrosis (ELF) test was previously reported to predict outcome ...

    • Fluctuating biomarkers in primary sclerosing cholangitis: A longitudinal comparison of alkaline phosphatase, liver stiffness, and ELF 

      Fossdal, Guri; Mjelle, Anders Batman; Wiencke, Kristine; Bjørk, Ida Torunn; Gilja, Odd Helge; Folseraas, Trine; Karlsen, Tom Hemming; Rosenberg, William; Melvær, Giil Lasse; Vesterhus, Mette Nåmdal (Journal article; Peer reviewed, 2021)
      Background & Aims Primary sclerosing cholangitis (PSC) is a progressive liver disease characterised by fluctuating liver biochemistries and highly variable disease progression. The Enhanced Liver Fibrosis (ELF®) test and ...

    • Immune-related genetic enrichment in frontotemporal dementia: An analysis of genome-wide association studies 

      Broce, Iris J.; Karch, Celeste M.; Wen, Natalie; Fan, Chun C.; Wang, Yunpeng; Hong Tan, Chin; Kouri, Naomi; Ross, Owen A.; Höglinger, Günter U.; Müller, Ulrich; Hardy, John; Momeni, Parastoo; Hess, Christopher P.; Dillon, William P.; Miller, Zachary A.; Bonham, Luke W.; Rabinovici, Gil D.; Rosen, Howard J.; Schellenberg, Gerard D.; Franke, Andre; Karlsen, Tom Hemming; Veldink, Jan H.; Ferrari, Raffaele; Yokoyama, Jennifer S.; Miller, Bruce L.; Andreassen, Ole Andreas; Dale, Anders; Desikan, Rahul S.; Sugrue, Leo P. (Peer reviewed; Journal article, 2018-01-09)
      Background: Converging evidence suggests that immune-mediated dysfunction plays an important role in the pathogenesis of frontotemporal dementia (FTD). Although genetic studies have shown that immune-associated loci are ...

    • Investigation of complement component C4 copy number variation in human longevity 

      Flachsbart, Friederike; Caliebe, Amke; Heinsen, Femke-Anouska; Karlsen, Tom Hemming; Schreiber, Stefan; Franke, Andre; Nebel, Almut (Peer reviewed; Journal article, 2014-01-22)
      Genetic factors have been estimated to account for about 25% of the variation in an adult’s life span. The complement component C4 with the isotypes C4A and C4B is an effector protein of the immune system, and differences ...

    • Liquid biopsy-based protein biomarkers for risk prediction, early diagnosis, and prognostication of cholangiocarcinoma 

      Lapitz, Ainhoa; Azkargorta, Mikel; Milkiewicz, Piotr; Olaizola, Paula; Zhuravleva, Ekaterina; Grimsrud, Marit Mæhle; Schramm, Christoph; Arbelaiz, Ander; O'Rourke, Colm J.; La Casta, Adelaida; Milkiewicz, Malgorzata; Pastor, Tania; Vesterhus, Mette Nåmdal; Jimenez-Agüero, Raul; Dill, Michael T.; Lamarca, Angela; Valle, Juan W.; Macias, Rocio I.R.; Izquierdo-Sanchez, Laura; Pérez Castaño, Ylenia; Caballero-Camino, Francisco Javier; Riaño, Ioana; Krawczyk, Marcin; Ibarra, Cesar; Bustamante, Javier; Nova-Camacho, Luiz M.; Falcon-Perez, Juan M.; Elortza, Felix; Perugorria, Maria J.; Andersen, Jesper B.; Bujanda, Luis; Karlsen, Tom Hemming; Folseraas, Trine; Rodrigues, Pedro M.; Banales, Jesus M. (Journal article; Peer reviewed, 2023)
      Background & Aims Cholangiocarcinoma (CCA), heterogeneous biliary tumours with dismal prognosis, lacks accurate early diagnostic methods especially important for individuals at high-risk (i.e. those with primary sclerosing ...

    • Mapping the human genetic architecture of COVID-19 

      Niemi, Mari E.K.; Karjalainen, Juha; Liao, Rachel G.; Neale, Benjamin M.; Daly, Mark; Ganna, Andrea; Pathak, Gita A.; Andrews, Shea J.; Kanai, Masahiro; Veerapen, Kumar; Fernandez-Cadenas, Israel; Schulte, Eva C.; Striano, Pasquale; Afset, Jan Egil; Solligård, Erik; Damås, Jan Kristian; Risnes, Kari; Bettini, Laura Rachele; Gustad, Lise Tuset; Holter, Jan Cato; Hov, Johannes Espolin Roksund; Karlsen, Tom Hemming; Folseraas, Trine; Holten, Aleksander Rygh; Dyrhol-Riise, Anne Ma; Tonby, Kristian; Lind, Andreas; Müller, Fredrik; Dudman, Susanne Gjeruldsen; Grimsrud, Marit Mæhle; Vadla, May Sissel; Myhre, Ronny; Kildal, Anders Benjamin; Hoff, Dag Arne Lihaug; Muller, Karl Erik; Heggelund, Lars; Bergan, Jonas; Skogen, Vegard (Journal article; Peer reviewed, 2021)
      The genetic make-up of an individual contributes to the susceptibility and response to viral infection. Although environmental, clinical and social factors have a role in the chance of exposure to SARS-CoV-2 and the severity ...

    • Rifaximin alters gut microbiota profile, but does not affect systemic inflammation - a randomized controlled trial in common variable immunodeficiency 

      Jørgensen, Silje Fjellgård; Macpherson, Magnhild Eide; Bjørnetrø, Tonje; Holm, Kristian; Kummen, Martin; Rashidi, Azita; Michelsen, Annika; Lekva, Tove; Halvorsen, Bente; Trøseid, Marius; Mollnes, Tom Eirik; Berge, Rolf Kristian; Yndestad, Arne; Ueland, Thor; Karlsen, Tom Hemming; Aukrust, Pål; Hov, Johannes Espolin Roksund; Fevang, Børre (Peer reviewed; Journal article, 2019-01-17)
      Common variable immunodefciency (CVID) patients have reduced gut microbial diversity compared to healthy controls. The reduced diversity is associated with gut leakage, increased systemic infammation and ten “key” bacteria ...

    • Rosuvastatin alters the genetic composition of the human gut microbiome 

      Kummen, Martin; Solberg, Ole Geir; Larsen, Christopher Storm; Holm, Kristian; Ragnarsson, Asgrimur; Trøseid, Marius; Vestad, Beate; Skårdal, Rita; Yndestad, Arne; Ueland, Thor; Svardal, Asbjørn M.; Berge, Rolf Kristian; Seljeflot, Ingebjørg; Gullestad, Lars; Karlsen, Tom Hemming; Aaberge, Lars; Aukrust, Pål; Hov, Johannes Espolin Roksund (Journal article; Peer reviewed, 2020)
      The gut microbiome contributes to the variation of blood lipid levels, and secondary bile acids are associated with the effect of statins. Yet, our knowledge of how statins, one of our most common drug groups, affect the ...

    • Second-line and Third-line therapy for Autoimmune Hepatitis: A position statement from the European Reference Network on Hepatological Diseases and the International Autoimmune Hepatitis Group 

      Lohse, Ansgar W.; Sebode, Marcial; Jørgensen, Marianne H.; Ytting, Henriette; Karlsen, Tom Hemming; Kelly, Deirdre; Manns, Michael P.; Vesterhus, Mette (Journal article; Peer reviewed, 2020)
      Most patients with autoimmune hepatitis respond well to standard immunosuppressive therapy with steroids and azathioprine, and while untreated disease is usually fatal, patients who respond well to therapy have an excellent ...