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Sökning: WFRF:(Hansson Lena 1968) > (2003-2004)

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1.
  • Hansson, Lena, 1968 (författare)
  • The Conceptions of Universal design
  • 2003
  • Ingår i: Conference on Business Studies. Reykjavik, Iceland 14-16 August 2003.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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  • Knutsen Rydberg, Ellen, 1969, et al. (författare)
  • Hypoxia increases LDL oxidation and expression of 15-lipoxygenase-2 in human macrophages
  • 2004
  • Ingår i: Arterioscler Thromb Vasc Biol. ; 24:11, s. 2040-2045
  • Tidskriftsartikel (refereegranskat)abstract
    • OBJECTIVE: Macrophage-mediated oxidation of low-density lipoprotein (LDL) by enzymes, such as the lipoxygenases, is considered of major importance for the formation of oxidized LDL during atherogenesis. Macrophages have been identified in hypoxic areas in atherosclerotic plaques. METHODS AND RESULTS: To investigate the role of hypoxia in macrophage-mediated LDL oxidation, we incubated human monocyte-derived macrophages with LDL under normoxic (21% O2) or hypoxic (0% O2) conditions. The results showed that hypoxic macrophages oxidized LDL to a significantly higher extent than normoxic cells. Interestingly, the mRNA and protein expression of 15-lipoxygenase-2 (15-LOX-2) as well as the activity of this enzyme are elevated in macrophages incubated at hypoxia. Both the unspliced 15-LOX-2 and the spliced variant 15-LOX-2sv-a are found in macrophages. In addition, 15-LOX-2 was identified in carotid plaques in some macrophage-rich areas but was only expressed at low levels in nondiseased arteries. CONCLUSIONS: In summary, these observations show for the first time that 15-LOX-2 is expressed in hypoxic macrophages and in atherosclerotic plaques and suggest that 15-LOX-2 may be one of the factors involved in macrophage-mediated LDL oxidation at hypoxia.
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