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Sökning: (WFRF:(Eriksson S)) srt2:(1990-1999)

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  • De Pergola, G, et al. (författare)
  • Amount of G-protein alpha-subunit in rat white adipocytes: lack of difference between subcutaneous and visceral fat.
  • 1993
  • Ingår i: Acta endocrinologica. - 0001-5598. ; 129:4, s. 366-70
  • Tidskriftsartikel (refereegranskat)abstract
    • It has been the purpose of this study to examine possible differences in the amount of stimulatory (Gs) and inhibitory (Gi) G-protein alpha-subunits (measured with a quantitative enzyme-linked immunosorbent assay in fat cell membrane preparation) between subcutaneous and intra-abdominal regions in rats. The lipolytic response to isoproterenol and the number of beta-adrenergic binding sites were also examined. These parameters were all evaluated simultaneously in subcutaneous (inguinal), epididymal and perirenal fat samples collected from six male Sprague-Dawley rats. The membrane contents of the Gs and Gi alpha-subunits were similar in the three depots. Moreover, no difference was found among the different regions with regard to isoproterenol-stimulated glycerol release and beta-adrenoceptor number, expressed per cell number. In conclusion, the present study shows for the first time in rats that the abundance of inhibitory and stimulatory G-protein alpha-subunits is similar in subcutaneous and in visceral adipocytes. Moreover, the number of beta-adrenoceptors and the lipolytic response to isoproterenol do not show significant variations with the anatomical site. As the present results are apparently in contrast with those obtained previously in human adipocytes, there is a possibility that the different results observed in rat and in human fat cells could be explained by species differences.
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  • Eriksson, Peter S, 1959, et al. (författare)
  • Neurogenesis in the adult human hippocampus
  • 1998
  • Ingår i: Nat Med. - 1078-8956. ; 4:11, s. 1313-7
  • Tidskriftsartikel (refereegranskat)abstract
    • The genesis of new cells, including neurons, in the adult human brain has not yet been demonstrated. This study was undertaken to investigate whether neurogenesis occurs in the adult human brain, in regions previously identified as neurogenic in adult rodents and monkeys. Human brain tissue was obtained postmortem from patients who had been treated with the thymidine analog, bromodeoxyuridine (BrdU), that labels DNA during the S phase. Using immunofluorescent labeling for BrdU and for one of the neuronal markers, NeuN, calbindin or neuron specific enolase (NSE), we demonstrate that new neurons, as defined by these markers, are generated from dividing progenitor cells in the dentate gyrus of adult humans. Our results further indicate that the human hippocampus retains its ability to generate neurons throughout life.
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  • ERIKSSON, S, et al. (författare)
  • Alpha 1-antichymotrypsin regulates Alzheimer beta-amyloid peptide fibril formation
  • 1995
  • Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. - 0027-8424. ; 92:6, s. 2313-2317
  • Tidskriftsartikel (refereegranskat)abstract
    • The major component of the cerebral plaques in Alzheimer disease is the beta-amyloid peptide, but serine proteinase inhibitors like alpha 1-antichymotrypsin (ACT) are also present. Their role in the pathogenesis of amyloid formation is unsettled. In addition to their function as proteinase inhibitors, serine proteinase inhibitors can interact with various hydrophobic compounds, a reaction accompanied by a transition from the stressed to the relaxed conformation. We report here on the ability of ACT to regulate the formation of beta-amyloid fibrils in vitro. In a molar ratio of 1:10 (ACT to beta-amyloid) ACT inhibits beta-amyloid fibril formation. Furthermore, ACT promotes rapid disaggregation of beta-amyloid fibrils when added in the same molar ratio to preformed beta-amyloid fibrils. These processes are accompanied by increased thermostability of ACT and loss of its biological activity, consistent with a conformational transition of ACT from the stressed to the relaxed state. The influence of ACT on beta-amyloid fibril formation may be an example of a hydrophobic interaction between the beta-amyloid peptide and the hydrophobic domain C terminal to the reactive center of ACT.
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