Mostrando recursos 1 - 5 de 5

  1. A brain-sparing diphtheria toxin for chemical genetic ablation of peripheral cell lineages

    Pereira, Mafalda M. A.; Mahú, Inês; Seixas, Elsa; Martinéz-Sánchez, Noelia; Kubasova, Nadiya; Pirzgalska, Roksana M; Cohen, Paul; Dietrich, Marcelo O; López, Miguel; Bernardes, Gonçalo J. L.; Domingos, Ana I.
    Conditional expression of diphtheria toxin receptor (DTR) is widely used for tissue-specific ablation of cells. However, diphtheria toxin (DT) crosses the blood-brain barrier, which limits its utility for ablating peripheral cells using Cre drivers that are also expressed in the central nervous system (CNS). Here we report the development of a brain-sparing DT, termed BRAINSPAReDT, for tissue-specific genetic ablation of cells outside the CNS. We prevent blood-brain barrier passage of DT through PEGylation, which polarizes the molecule and increases its size. We validate BRAINSPAReDT with regional genetic sympathectomy: BRAINSPAReDT ablates peripheral but not central catecholaminergic neurons, thus avoiding the Parkinson-like...
    - 12-abr-2017

  2. Leptin Resistance and the Neuro-Adipose Connection

    Barateiro, Andreia; Mahú, Ines; Domingos, Ana I.
    This article was submitted to Cellular Endocrinology, a section of the journal Frontiers in Endocrinology.
    - 26-mar-2017

  3. Curcumin Inhibits Gastric Inflammation Induced by Helicobacter Pylori Infection in a Mouse Model

    Santos, António; Lopes, Teresa; Oleastro, Mónica; Gato, Inês; Floch, Pauline; Benejat, Lucie; Chaves, Paula; Pereira, Teresa; Seixas, Elsa; Machado, Jorge; Guerreiro, António
    Helicobacter pylori (H. pylori) infection triggers a sequence of gastric alterations starting with an inflammation of the gastric mucosa that, in some cases, evolves to gastric cancer. Efficient vaccination has not been achieved, thus it is essential to find alternative therapies, particularly in the nutritional field. The current study evaluated whether curcumin could attenuate inflammation of the gastric mucosa due to H. pylori infection. Twenty-eight C57BL/6 mice, were inoculated with the H. pylori SS1 strain; ten non-infected mice were used as controls. H. pylori infection in live mice was followed-up using a modified 13C-Urea Breath Test (13C-UBT) and quantitative real-time...
    - 17-feb-2017

  4. Hypothalamic melanin concentrating hormone neurons communicate the nutrient value of sugar

    Domingos, Ana I; Sordillo, Aylesse; Dietrich, Marcelo O; Liu, Zhong-Wu; Tellez, Luis A; Vaynshteyn, Jake; Ferreira, Jozelia G; Ekstrand, Mats I; Horvath, Tamas L; de Araujo, Ivan E; Friedman, Jeffrey M
    Sugars that contain glucose, such as sucrose, are generally preferred to artificial sweeteners owing to their post-ingestive rewarding effect, which elevates striatal dopamine (DA) release. While the post-ingestive rewarding effect, which artificial sweeteners do not have, signals the nutrient value of sugar and influences food preference, the neural circuitry that mediates the rewarding effect of glucose is unknown. In this study, we show that optogenetic activation of melanin-concentrating hormone (MCH) neurons during intake of the artificial sweetener sucralose increases striatal dopamine levels and inverts the normal preference for sucrose vs sucralose. Conversely, animals with ablation of MCH neurons no longer...
    - 08-may-2016

  5. The reward value of sucrose in leptin-deficient obese mice

    Domingos, Ana I.; Vaynshteyn, Jake; Sordillo, Aylesse; Friedman, Jeffrey M.
    Leptin-deficient patients report higher "liking" ratings for food, and leptin replacement therapy normalizes these ratings even before weight loss is achieved. Since animals cannot report their ratings, we studied the relationship between leptin and food reward in leptin-deficient ob/ob mice using a optogenetic assay that quantifies the reward value of sucrose. In this assay, mice chose between one sipper dispensing the artificial sweetener sucralose coupled to optogenetic activation of dopaminergic (DA) neurons, and another sipper dispensing sucrose. We found that the reward value of sucrose was high under a state of leptin deficiency, as well as at a dose of...
    - 07-may-2016

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