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Sökning: WFRF:(Fransén Karin) > Annan publikation

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  • Fransén, Karin, et al. (författare)
  • Promotion of intestinal polyposis in nitric oxide synthase 2 (NOS2) deficient Min mice and expression of genes in the Notch-1 pathway
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • Nitric oxide synthase 2 (NOS2) expression has been found in several different tumor types, including colorectal cancers, but the role of NOS2 expression for cancer development is not fully understood. In the present study, we have investigated the role of NOS2 for intestinal polyp development in the APC Min/+ mouse and studied the mRNA expression by real time PCR of Notch-1 and p21 in normal murine small intestinal tissue and polyps from APC Min/+ NOS2+/+ and APC Min/+ NOS2-/- mice. A significant higher polyp frequency was found in mice with APC Min/+ NOS2-/- genotype compared to APC Min/+ NOS2+/+ mice. The expression of Notch-1 was significantly increased in polyps from the APC Min/+ NOS2+/+ mice compared to wild type small intestinal mucosa, but no difference was evident between the APC Min/+ NOS2+/+ and APC Min/+ NOS2-/- mice, which indicates that NOS2 expression does not affect the Notch-1 expression. No significant difference was found between the different mouse groups regarding the expression of p21. Collectively, NOS2 expression is a protective factor in intestinal polyposis, but its role in polyp development is still unclear.
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  • Sahdo, Berolla, 1984-, et al. (författare)
  • Cytokine profile in a cohort of healthy blood donors carrying polymorphisms in genes encoding the nlrp3 inflammasome
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • Background: The NLRP3 inflammasome has been recognized as one of the key components of the innate immunity by sensing a diversity of insults. Inflammasome activation results in the maturation of the pro-inflammatory cytokines interleukin (IL)-1β and IL-18. Increased production of IL-1β is found in patients with gain-of-function polymorphisms in genes encoding the NLRP3 inflammasome. Since approximately 5% of the Swedish population are heterozygote carriers of these combined gene variants, their impact on inflammasome status and a relationship on disease development is therefore highly relevant to study. The present study investigates levels of inflammasome-produced cytokines as a measure of inflammasome activation in healthy individuals carrying Q705K polymorphism in the NLRP3 gene combined with C10X in the CARD8 gene.Materials and Methods: Genotyping of 1006 healthy blood donors was performed for the polymorphisms Q705K in the NLRP3 and C10X in the CARD8 genes. IL-1β, IL-18, IL-33, as well as a number of other pro-inflammatory cytokines, were analyzed by Luminex or ELISA in plasma from individuals carrying the polymorphisms and in age and gender matched noncarrier controls.Results & Discussion: The prevalence of the polymorphisms was in line with previous studies. Plasma levels of IL-1β and IL-33 were elevated among carriers of combined Q705K/C10X polymorphisms compared to controls, whereas no difference was found for IL- 18 and the other cytokines measured. These data suggest that these combined polymorphisms creates inflammasomes with increased basal activation state, which might provide a more favourable innate immune response. In spite of this, it could also represent the mechanisms by which the inflammatory loop is triggered into a long-term inflammatory phenotype.
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