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Sökning: WFRF:(Castaneda Tamara R.)

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1.
  • Bernal, Ximena E., et al. (författare)
  • Empowering Latina scientists
  • 2019
  • Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 363:6429, s. 825-826
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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2.
  • Grandoch, Maria, et al. (författare)
  • 4-Methylumbelliferone improves the thermogenic capacity of brown adipose tissue
  • 2019
  • Ingår i: Nature Metabolism. - : Springer Science and Business Media LLC. - 2522-5812. ; 1:5, s. 546-559
  • Tidskriftsartikel (refereegranskat)abstract
    • Therapeutic increase in brown adipose tissue (BAT) thermogenesis is of great interest, as BAT activation counteracts obesity and insulin resistance. Hyaluronan (HA) is a glycosaminoglycan, found in the extracellular matrix, that is synthesized by HA synthases (HAS1, HAS2, and HAS3) from sugar precursors and accumulates in diabetic conditions. Its synthesis can be inhibited by the small molecule 4-methylumbelliferone (4-MU). Here we show that inhibition of HA synthesis by 4-MU or genetic deletion of Has2 and Has3 improves the thermogenic capacity of BAT, reduces body-weight gain, and improves glucose homeostasis independently of adrenergic stimulation in mice on a diabetogenic diet. In this context, we validated a novel magnetic resonce T2 mapping approach for in vivo visualization of BAT activation. Inhibition of HA synthesis increases glycolysis, BAT respiration, and uncoupling protein 1 (UCP1) expression. In addition, we show that 4-MU increases BAT capacity without inducing chronic stimulation and propose that 4-MU, a clinically approved, prescription-free drug, could be repurposed to treat obesity and diabetes.
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3.
  • Tovar, Sulay, et al. (författare)
  • Central administration of resistin promotes short-term satiety in rats.
  • 2005
  • Ingår i: European journal of endocrinology / European Federation of Endocrine Societies. - : Oxford University Press (OUP). - 0804-4643. ; 153:3
  • Tidskriftsartikel (refereegranskat)abstract
    • OBJECTIVE: Several hormones expressed in white adipose tissue influence food intake at the central level. We sought to determine whether resistin, a circulating adipose-derived hormone in rodents, has actions on the hypothalamus by determining the effects of central resistin injection on food intake and on hypothalamic Fos protein expression. DESIGN: As resistin expression in adipose tissue is influenced by altered nutritional status, we studied the effect of central resistin in both fed and pre-fasted rats. RESULTS: In fasted rats, central injection of resistin decreased food intake acutely and increased the number of cells that express Fos protein in the arcuate nucleus but not in any other hypothalamic structure. The effect on food intake was dose-dependent and did not result in the formation of a conditioned taste aversion. CONCLUSIONS: Taken together, these results provide the first evidence documenting a central action of resistin, which could be involved in a feedback loop targeting the hypothalamus. On the other hand, since we observed resistin mRNA in the arcuate and ventromedial nuclei of the hypothalamus, it is also possible that brain-derived resistin serves as a neuropeptide involved in the regulation of energy homeostasis. However, since resistin-induced satiety was modest and transient, as central administration for several days did not affect body weight, the physiological relevance and therapeutic potential of the observed principal phenomenon may be limited.
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