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Träfflista för sökning "WFRF:(Pietilainen Kirsi H.) srt2:(2020-2023)"

Search: WFRF:(Pietilainen Kirsi H.) > (2020-2023)

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1.
  • U-Din, Mueez, et al. (author)
  • Cold-stimulated brown adipose tissue activation is related to changes in serum metabolites relevant to NAD + metabolism in humans
  • 2023
  • In: Cell Reports. - 2211-1247. ; 42:9
  • Journal article (peer-reviewed)abstract
    • Cold-induced brown adipose tissue (BAT) activation is considered to improve metabolic health. In murine BAT, cold increases the fundamental molecule for mitochondrial function, nicotinamide adenine dinucleotide (NAD+), but limited knowledge of NAD+ metabolism during cold in human BAT metabolism exists. We show that cold increases the serum metabolites of the NAD+ salvage pathway (nicotinamide and 1-methylnicotinamide) in humans. Additionally, individuals with cold-stimulated BAT activation have decreased levels of metabolites from the de novo NAD+ biosynthesis pathway (tryptophan, kynurenine). Serum nicotinamide correlates positively with cold-stimulated BAT activation, whereas tryptophan and kynurenine correlate negatively. Furthermore, the expression of genes involved in NAD+ biosynthesis in BAT is related to markers of metabolic health. Our data indicate that cold increases serum tryptophan conversion to nicotinamide to be further utilized by BAT. We conclude that NAD+ metabolism is activated upon cold in humans and is probably regulated in a coordinated fashion by several tissues.
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2.
  • van der Kolk, Birgitta W., et al. (author)
  • Molecular pathways behind acquired obesity : Adipose tissue and skeletal muscle multiomics in monozygotic twin pairs discordant for BMI
  • 2021
  • In: Cell Reports Medicine. - : Elsevier BV. - 2666-3791. ; 2:4, s. 100226-
  • Journal article (peer-reviewed)abstract
    • Tissue-specific mechanisms prompting obesity-related development complications in humans remain unclear. We apply multiomics analyses of subcutaneous adipose tissue and skeletal muscle to examine the effects of acquired obesity among 49 BMI-discordant monozygotic twin pairs. Overall, adipose tissue appears to be more affected by excess body weight than skeletal muscle. In heavier co-twins, we observe a transcriptional pattern of downregulated mitochondrial pathways in both tissues and upregulated inflammatory pathways in adipose tissue. In adipose tissue, heavier co-twins exhibit lower creatine levels; in skeletal muscle, glycolysis- and redox stress-related protein and metabolite levels remain higher. Furthermore, metabolomics analyses in both tissues reveal that several proinflammatory lipids are higher and six of the same lipid derivatives are lower in acquired obesity. Finally, in adipose tissue, but not in skeletal muscle, mitochondrial downregulation and upregulated inflammation are associated with a fatty liver, insulin resistance, and dyslipidemia, suggesting that adipose tissue dominates in acquired obesity.
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