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  • 1.
    Malla, Sandhya
    et al.
    Umeå University, Faculty of Medicine, Wallenberg Centre for Molecular Medicine at Umeå University (WCMM). Umeå University, Faculty of Medicine, Department of Medical Biosciences.
    Melguizo-Sanchis, Dario
    Umeå University, Faculty of Medicine, Wallenberg Centre for Molecular Medicine at Umeå University (WCMM). Umeå University, Faculty of Medicine, Department of Medical Biosciences.
    Aguilo, Francesca
    Umeå University, Faculty of Medicine, Wallenberg Centre for Molecular Medicine at Umeå University (WCMM). Umeå University, Faculty of Medicine, Department of Medical Biosciences.
    Steering pluripotency and differentiation with N6-methyladenosine RNA modification2019In: Biochimica et Biophysica Acta. Gene Regulatory Mechanisms, ISSN 1874-9399, E-ISSN 1876-4320, Vol. 1862, no 3, p. 394-402Article in journal (Refereed)
    Abstract [en]

    Chemical modifications of RNA provide a direct and rapid way to modulate the existing transcriptome, allowing the cells to adapt rapidly to the changing environment. Among these modifications, N6-methyladenosine (m6A) has recently emerged as a widely prevalent mark of messenger RNA in eukaryotes, linking external stimuli to an intricate network of transcriptional, post-transcriptional and translational processes. m6A modification modulates a broad spectrum of biochemical processes, including mRNA decay, translation and splicing. Both m6A modification and the enzymes that control m6A metabolism are essential for normal development. In this review, we summarized the most recent findings on the role of m6A modification in maintenance of the pluripotency of embryonic stem cells (ESCs), cell fate specification, the reprogramming of somatic cells into induced pluripotent stem cells (iPSCs), and differentiation of stem and progenitor cells.

  • 2.
    Nyrén, Rakel
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Physiological chemistry.
    Makoveichuk, Elena
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Physiological chemistry.
    Malla, Sandhya
    Umeå University, Faculty of Medicine, Wallenberg Centre for Molecular Medicine at Umeå University (WCMM). Umeå University, Faculty of Medicine, Department of Medical Biosciences, Physiological chemistry.
    Kersten, Sander
    Nilsson, Stefan K.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Physiological chemistry.
    Ericsson, Madelene
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Physiological chemistry.
    Olivecrona, Gunilla
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Physiological chemistry.
    Lipoprotein lipase in mouse kidney: effects of nutritional status and high-fat diet2019In: American Journal of Physiology - Renal Physiology, ISSN 1931-857X, E-ISSN 1522-1466, Vol. 316, no 3, p. F558-F571Article in journal (Refereed)
    Abstract [en]

    Activity of lipoprotein lipase (LPL) is high in mouse kidney, but the reason is poorly understood. The aim was to characterize localization, regulation, and function of LPL in kidney of C57BL/6J mice. We found LPL mainly in proximal tubules, localized inside the tubular epithelial cells, under all conditions studied. In fed mice, some LPL, colocalized with the endothelial markers CD31 and GPIHBP1 and could be removed by perfusion with heparin. indicating a vascular location. The role of angiopoietin-like protein 4 (ANGPTL4) for nutritional modulation of LPL activity was studied in wild-type and Angptl4(-/-) mice. In Angptl4(-/-) mice, kidney LPL activity remained high in fasted animals, indicating that ANGPTL4 is involved in suppression of LPL activity on fasting, like in adipose tissue. The amount of ANGPTL4 protein in kidney was low, and the protein appeared smaller in size, compared with ANGPTL4 in heart and adipose tissue. To study the influence of obesity, mice were challenged with high-fat diet for 22 wk, and LPL was studied after an overnight fast compared with fasted mice given food for 3 h. High-fat diet caused blunting of the normal adaptation of LPL activity to feeding/fasting in adipose tissue, but in kidneys this adaptation was lost only in male mice. LPL activity increases to high levels in mouse kidney after feeding, but as no difference in uptake of chylomicron triglycerides in kidneys is found between fasted and fed states, our data confinn that LPL appears to have a minor role for lipid uptake in this organ.

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