Institutt for medisinsk biologi: Recent submissions
Now showing items 101-120 of 1189
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Endogenous IL-1 receptor antagonist restricts healthy and malignant myeloproliferation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-03)Here we explored the role of interleukin-1β (IL-1β) repressor cytokine, IL-1 receptor antagonist (IL-1rn), in both healthy and abnormal hematopoiesis. Low IL-1RN is frequent in acute myeloid leukemia (AML) patients and represents a prognostic marker of reduced survival. Treatments with IL-1RN and the IL-1β monoclonal antibody canakinumab reduce the expansion of leukemic cells, including CD34+ ... -
Machine learning-based immune phenotypes correlate with STK11/KEAP1 co-mutations and prognosis in resectable NSCLC: a sub-study of the TNM-I trial
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-24)Background - We aim to implement an immune cell score model in routine clinical practice for resected non-small-cell lung cancer (NSCLC) patients (NCT03299478). Molecular and genomic features associated with immune phenotypes in NSCLC have not been explored in detail.<p> <p>Patients and methods - We developed a machine learning (ML)-based model to classify tumors into one of three categories: ... -
17β-estradiol promotes extracellular vesicle release and selective miRNA loading in ERα-positive breast cancer
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-30)The causes and consequences of abnormal biogenesis of extracellular vesicles (EVs) are not yet well understood in malignancies, including in breast cancers (BCs). Given the hormonal signaling dependence of estrogen receptor–positive (ER+) BC, we hypothesized that 17β-estradiol (estrogen) might influence EV production and microRNA (miRNA) loading. We report that physiological doses of 17β-estradiol ... -
Association between Variants in the OCA2-HERC2 Region and Blue Eye Colour in HERC2 rs12913832 AA and AG Individuals
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-11)The OCA2-HERC2 region is strongly associated with human pigmentation, especially eye colour. The HERC2 SNP rs12913832 is currently the best-known predictor for blue and brown eye colour. However, in a previous study we found that 43 of 166 Norwegians with the brown eye colour genotype rs12913832:AA or AG, did not have the expected brown eye colour. In this study, we carried out massively parallel ... -
Development of early life gut resistome and mobilome across gestational ages and microbiota-modifying treatments
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-13)Background - Gestational age (GA) and associated level of gastrointestinal tract maturation are major factors driving the initial gut microbiota composition in preterm infants. Besides, compared to term infants, premature infants often receive antibiotics to treat infections and probiotics to restore optimal gut microbiota. How GA, antibiotics, and probiotics modulate the microbiota’s core ... -
A combined experimental-computational approach uncovers a role for the Golgi matrix protein Giantin in breast cancer progression
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-17)Our understanding of how speed and persistence of cell migration affects the growth rate and size of tumors remains incomplete. To address this, we developed a mathematical model wherein cells migrate in two-dimensional space, divide, die or intravasate into the vasculature. Exploring a wide range of speed and persistence combinations, we find that tumor growth positively correlates with increasing ... -
Obesity Is Associated with Distorted Proteoglycan Expression in Adipose Tissue
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-07)Proteoglycans are central components of the extracellular matrix (ECM) and binding partners for inflammatory chemokines. Morphological differences in the ECM and increased inflammation are prominent features of the white adipose tissues in patients with obesity. The impact of obesity and weight loss on the expression of specific proteoglycans in adipose tissue is not well known. This study aimed to ... -
Breast cancer patient-derived explant cultures recapitulate in vivo drug responses
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-22)Assessment of drug sensitivity in tumor tissue ex vivo may significantly contribute to functional diagnostics to guide personalized treatment of cancer. Tumor organoid- and explant-cultures have become attractive tools towards this goal, although culturing conditions for breast cancer (BC) tissue have been among the most challenging to develop. Validation of possibilities to detect concordant responses ... -
The expression pattern of pyruvate dehydrogenase kinases predicts prognosis and correlates with immune exhaustion in clear cell renal cell carcinoma
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-05)Renal cancer cells constitute a paradigm of tumor cells with a glycolytic reprogramming which drives metabolic alterations favouring cell survival and transformation. We studied the expression and activity of pyruvate dehydrogenase kinases (PDK1-4), key enzymes of the energy metabolism, in renal cancer cells. We analysed the expression, subcellular distribution and clinicopathological correlations ... -
Taking hospital pathogen surveillance to the next level
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-26)High-throughput bacterial genomic sequencing and subsequent analyses can produce large volumes of high-quality data rapidly. Advances in sequencing technology, with commensurate developments in bioinformatics, have increased the speed and efficiency with which it is possible to apply genomics to outbreak analysis and broader public health surveillance. This approach has been focused on targeted ... -
Dynamics of SARS-CoV-2 Spike-IgG throughout Three COVID-19 Vaccination Regimens: A 21-Month Longitudinal Study of 82 Norwegian Healthcare Workers
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-23)To facilitate interpretation of clinical SARS-CoV-2 anti-spike IgG analyses post-vaccination, 82 healthcare workers were followed through three vaccination-regimens: two regimens were comprised of two doses of BNT162b2 three or six weeks apart, followed by a dose of mRNA-vaccine, and in the other regimen, the first dose was replaced by ChAdOx1 nCov-19. After each dose, anti-spike IgG was compared ... -
Disclosing quantitative RT-PCR raw data during manuscript submission: a call for action
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-14)Accuracy and transparency of scientific data are becoming more and more relevant with the increasing concern regarding the evaluation of data reproducibility in many research areas. This concern is also true for quantifying coding and noncoding RNAs, with the remarkable increase in publications reporting RNA profiling and sequencing studies. To address the problem, we propose the following ... -
Reversible vancomycin susceptibility within emerging ST1421 Enterococcus faecium strains is associated with rearranged vanA-gene clusters and increased vanA plasmid copy number
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-13)Vancomycin variable enterococci (VVE) are van-positive enterococci with a vancomycin-susceptible phenotype (VVE-S) that can convert to a resistant phenotype (VVE-R) and be selected for during vancomycin exposure. VVE-R outbreaks have been reported in Canada and Scandinavian countries. The aim of this study was to examine the presence of VVE in whole genome sequenced (WGS) Australian bacteremia ... -
Antimicrobial susceptibility testing of Bacteroides species by disk diffusion: The NordicAST Bacteroides study
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-28)Objectives - Antimicrobial susceptibility testing (AST) of anaerobic bacteria has until recently been done by MIC methods. We have carried out a multi-centre evaluation of the newly validated EUCAST disk diffusion method for AST of Bacteroides spp.<p> <p>Methods - A panel of 30 Bacteroides strains was assembled based on reference agar dilution MICs, resistance gene detection and quantification ... -
Microbiome Structure and Mucosal Morphology of Jejunum Appendix and Colon of Rats in Health and Dysbiosis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-06)Gut microbiota contributes to human health. Plenty of studies demonstrate that antibiotics can disrupt gut ecosystem leading to dysbiosis. Little is known about the microbial variation of appendix and its up/downstream intestine after antibiotic treatment. This study aimed to investigate the microbiome and mucosal morphology of jejunum, appendix, and colon of rats in health and dysbiosis. A rodent ... -
Exploring differentially expressed genes of Staphylococcus aureus exposed to human tonsillar cells using RNA sequencing
(Journal article; Tidsskriftartikkel, 2023-07-12)Background - The nose and the throat are the most predominant colonizing sites of Staphylococcus aureus, and colonization is a risk factor for infection. Nasal colonization is well described; however, we have limited knowledge about S. aureus throat colonization. The main objective of this study was to explore differentially expressed genes (DEGs) in S. aureus throat isolate TR145 exposed to human ... -
Advanced methods and novel biomarkers in autoimmune diseases ‑ a review of the recent years progress in systemic lupus erythematosus
(Journal article; Tidsskriftartikkel, 2023-06-23)There are several autoimmune and rheumatic diseases affecting different organs of the human body. Multiple sclerosis (MS) mainly affects brain, rheumatoid arthritis (RA) mainly affects joints, Type 1 diabetes (T1D) mainly affects pancreas, Sjogren’s syndrome (SS) mainly affects salivary glands, while systemic lupus erythematosus (SLE) affects almost every organ of the body. Autoimmune diseases are ... -
The use of traditional and unconventional culturing methods for the discovery of antimicrobial compounds derived from marine microorganisms
(Mastergradsoppgave; Master thesis, 2023-05-15)The main aim is to evaluate the content of marine biofilms and different marine bacteria for antimicrobial potential. Hypothesis: antimicrobial compounds can be produced in the presence of other bacterial species; in the context of Winogradsky columns that simulate a naturalistic environment, and in the proximity to other species in the case of marine bacterial isolates. For this main aim and ... -
Diet-induced obese mouse hearts tolerate an acute high fatty acid exposure that also increases ischemic tolerance
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-03)An ischemic insult is accompanied by an acute increase in circulating fatty acid (FA) levels, which can induce adverse changes related to cardiac metabolism/energetics. Although chronic hyperlipidemia contributes to the pathogenesis of obesity-/diabetes-related cardiomyopathy, it is unclear how these hearts are affected by an acute high FA-load. We hypothesize that adaptation to chronic FA exposure ... -
Within-patient and global evolutionary dynamics of Klebsiella pneumoniae ST17
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-18)Klebsiella pneumoniae sequence type (ST) 17 is a global problem clone that causes multidrug-resistant (MDR) hospital infections worldwide. In 2008–2009, an outbreak of MDR ST17 occurred at a neonatal intensive care unit (NICU) in Stavanger, Norway. Fifty-seven children were colonized. We observed intestinal persistence of ST17 in all of the children for up to two years after hospital discharge. ...