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Sökning: WFRF:(Picard Bertrand)

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1.
  • Denamur, Erick, et al. (författare)
  • High frequency of mutator strains among human uropathogenic Escherichia coli isolates.
  • 2002
  • Ingår i: Journal of Bacteriology. - 0021-9193 .- 1098-5530. ; 184:2, s. 605-9
  • Tidskriftsartikel (refereegranskat)abstract
    • By using a panel of 603 commensal and pathogenic Escherichia coli and Shigella isolates, we showed that mutation rates of strains vary considerably among different ecotypes. Uropathogenic strains had the highest frequency of mutators, while strains from patients with bacteremia had the lowest mutation rates. No correlation between the mutation rates and antibiotic resistance was observed among the studied strains.
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2.
  • Stratoulias, Vassilis, et al. (författare)
  • ARG1-expressing microglia show a distinct molecular signature and modulate postnatal development and function of the mouse brain
  • 2023
  • Ingår i: Nature Neuroscience. - : Nature Publishing Group. - 1097-6256 .- 1546-1726. ; 26:6, s. 1008-1020
  • Tidskriftsartikel (refereegranskat)abstract
    • Molecular diversity of microglia, the resident immune cells in the CNS, is reported. Whether microglial subsets characterized by the expression of specific proteins constitute subtypes with distinct functions has not been fully elucidated. Here we describe a microglial subtype expressing the enzyme arginase-1 (ARG1; that is, ARG1+ microglia) that is found predominantly in the basal forebrain and ventral striatum during early postnatal mouse development. ARG1+ microglia are enriched in phagocytic inclusions and exhibit a distinct molecular signature, including upregulation of genes such as Apoe, Clec7a, Igf1, Lgals3 and Mgl2, compared to ARG1- microglia. Microglial-specific knockdown of Arg1 results in deficient cholinergic innervation and impaired dendritic spine maturation in the hippocampus where cholinergic neurons project, which in turn results in impaired long-term potentiation and cognitive behavioral deficiencies in female mice. Our results expand on microglia diversity and provide insights into microglia subtype-specific functions.
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