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Sökning: WFRF:(Öhrfelt Annika 1973 )

  • Resultat 31-36 av 36
  • Föregående 123[4]
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31.
  • Öhrfelt Olsson, Annika, 1973, et al. (författare)
  • Identification of Novel α-Synuclein Isoforms in Human Brain Tissue by using an Online NanoLC-ESI-FTICR-MS Method.
  • 2011
  • Ingår i: Neurochemical research. - 1573-6903. ; 36:11
  • Tidskriftsartikel (refereegranskat)abstract
    • Parkinson's disease (PD) and Dementia with Lewy bodies (DLB) are neurodegenerative diseases that are characterized by intra-neuronal inclusions of Lewy bodies in distinct brain regions. These inclusions consist mainly of aggregated α-synuclein (α-syn) protein. The present study used immunoprecipitation combined with nanoflow liquid chromatography (LC) coupled to high resolution electrospray ionization Fourier transform ion cyclotron resonance tandem mass spectrometry (ESI-FTICR-MS/MS) to determine known and novel isoforms of α-syn in brain tissue homogenates. N-terminally acetylated full-length α-syn (Ac-α-syn(1-140)) and two N-terminally acetylated C-terminally truncated forms of α-syn (Ac-α-syn(1-139) and Ac-α-syn(1-103)) were found. The different forms of α-syn were further studied by Western blotting in brain tissue homogenates from the temporal cortex Brodmann area 36 (BA36) and the dorsolateral prefrontal cortex BA9 derived from controls, patients with DLB and PD with dementia (PDD). Quantification of α-syn in each brain tissue fraction was performed using a novel enzyme-linked immunosorbent assay (ELISA).
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32.
  • Öhrfelt Olsson, Annika, 1973, et al. (författare)
  • Screening for new biomarkers for subcortical vascular dementia and Alzheimer's disease
  • 2011
  • Ingår i: Dementia and Geriatric Cognitive Disorders Extra. - 1664-5464. ; 1:1, s. 31-42
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Novel biomarkers are important for identifying as well as differentiating subcortical vascular dementia (SVD) and Alzheimer’s disease (AD) at an early stage in the disease process. Methods: In two independent cohorts, a multiplex immunoassay was utilized to analyze 90 proteins in cerebrospinal fluid (CSF) samples from dementia patients and patients at risk of developing dementia (mild cognitive impairment). Results: The levels of several CSF proteins were increased in SVD and its incipient state, and in moderate-to-severe AD compared with the control group. In contrast, some CSF proteins were altered in AD, but not in SVD. The levels of heart-type fatty acid binding protein (H-FABP) were consistently increased in all groups with dementia but only in some of their incipient states. Conclusions: In summary, these results support the notion that SVD and AD are driven by different pathophysiological mechanisms reflected in the CSF protein profile and that H-FABP in CSF is a general marker of neurodegeneration
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33.
  • Kalm, Marie, 1981, et al. (författare)
  • Transient inflammation in neurogenic regions after irradiation of the developing brain.
  • 2009
  • Ingår i: Radiation research. - 0033-7587. ; 171:1, s. 66-76
  • Tidskriftsartikel (refereegranskat)abstract
    • Kalm, M., Fukuda, A., Fukuda, H., Ohrfelt, A., Lannering, B., Björk-Eriksson, T., Blennow, K., Márky, I. and Blomgren, K. Transient Inflammation in Neurogenic Regions after Irradiation of the Developing Brain. Radiat. Res. 171, 66-76 (2009).We characterized the inflammatory response after a single dose of 8 Gy to the brains of postnatal day 9 rats. Affymetrix gene chips revealed activation of multiple inflammatory mechanisms in the acute phase, 6 h after irradiation. In the subacute phase, 7 days after irradiation, genes related to neurogenesis and cell cycle were down-regulated, but glial fibrillary acidic protein (GFAP) was up-regulated. The concentrations of 14 different cytokines and chemokines were measured using a microsphere-based xMAPtrade mark technology. CCL2, Gro/KC and IL-1alpha were the most strongly up-regulated 6 h after irradiation. CCL2 was expressed in astrocytes and microglia in the dentate gyrus and the subventricular zone (SVZ). Hypertrophy, but not hyperplasia, of astrocytes was demonstrated 7 days after irradiation. In summary, we found transient activation of multiple inflammatory mechanisms in the acute phase (6 h) after irradiation and activation of astrocytes in the subacute phase (7 days) after irradiation. It remains to be elucidated whether these transient changes are involved in the persistent effects of radiation observed on neurogenesis and cognition in rodents.
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34.
  • Vanderstichele, Hugo, et al. (författare)
  • Analytical performance and clinical utility of the INNOTEST PHOSPHO-TAU181P assay for discrimination between Alzheimer's disease and dementia with Lewy bodies.
  • 2006
  • Ingår i: Clinical chemistry and laboratory medicine : CCLM / FESCC. - 1434-6621. ; 44:12, s. 1472-80
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: Total tau (T-tau) and beta-amyloid((1-42)) (Abeta(1-42)) levels in cerebrospinal fluid (CSF) can differentiate Alzheimer's disease (AD) from normal aging or depressive pseudo-dementia. Differential diagnosis from dementia with Lewy bodies (DLB) in clinical settings is difficult. METHODS: The analytical performance of the INNOTEST PHOSPHO-TAU(181P) assay was validated in terms of selectivity, sensitivity, specificity, precision, robustness, and stability. Clinical utility of the assay alone, or combined with T-tau and Abeta(1-42), for discrimination of AD (n=94) from patients suffering from DLB (n=60) or from age-matched control subjects (CS) (n=60) was assessed in a multicenter study. RESULTS: CSF concentrations of tau phosphorylated at threonine 181 (P-tau(181P)) in AD was significantly higher than in DLB and CS. Discriminant analysis, a classification tree, and logistic regression showed that P-tau(181P) was the most statistically significant single variable of the three biomarkers for discrimination between AD and DLB. CONCLUSIONS: P-tau(181P) quantification is a robust and reliable assay that may be useful in discriminating AD from DLB.
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35.
  • Wallin, Anders, 1950, et al. (författare)
  • Characteristic clinical presentation and CSF biomarker pattern in cerebral small vessel disease
  • 2012
  • Ingår i: Journal of the Neurological Sciences. - 0022-510X. ; 322:1-2, s. 192-196
  • Tidskriftsartikel (refereegranskat)abstract
    • To be able to live a good, independent life cognitive functions need to be intact. Dementia, stroke and neuropsychiatric disorders are the major disorders underlying disability. Stroke is usually a consequence of an underlying vessel wall disease that has lasted for a longer period. This vessel wall disease is commonly silent or without prominent symptoms. Damage to the small penetrating arterioles of the brain, arteriolosclerosis, induced by aging and hypertension, as well as other factors such as diabetes and genetic vulnerability, plays an important role in the origin of white matter changes. The pathological vascular wall process leads to lumen constriction, impaired ability to change lumen diameter according to metabolic needs and possible ischemic-hypoxic tissue damage in the vulnerable vascular architectural terminal areas of the long penetrating arteries. The arteriolosclerotic blood vessels are associated with inflammation and remodelling of the extracellular matrix. Enzymes connected to this process have also been found to be involved in demyelination and blood brain barrier opening but also in the repair process of angiogenesis and neurogenesis. Biochemical changes reflecting these processes might be early indicators of small vessel disease and hence increase the knowledge about the disease characteristic mechanisms. Moreover, monitoring disease modifying treatment effects can be an important application for small vessel disease specific biochemical markers. (c) 2012 Elsevier B.V. All rights reserved.
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36.
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  • Resultat 31-36 av 36
  • Föregående 123[4]
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Blennow, Kaj, 1958 (29)
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