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Cell Metab ; 23(5): 821-36, 2016 May 10.
Artículo en Inglés | MEDLINE | ID: mdl-27133129


Despite significant advances in our understanding of the biology determining systemic energy homeostasis, the treatment of obesity remains a medical challenge. Activation of AMP-activated protein kinase (AMPK) has been proposed as an attractive strategy for the treatment of obesity and its complications. AMPK is a conserved, ubiquitously expressed, heterotrimeric serine/threonine kinase whose short-term activation has multiple beneficial metabolic effects. Whether these translate into long-term benefits for obesity and its complications is unknown. Here, we observe that mice with chronic AMPK activation, resulting from mutation of the AMPK γ2 subunit, exhibit ghrelin signaling-dependent hyperphagia, obesity, and impaired pancreatic islet insulin secretion. Humans bearing the homologous mutation manifest a congruent phenotype. Our studies highlight that long-term AMPK activation throughout all tissues can have adverse metabolic consequences, with implications for pharmacological strategies seeking to chronically activate AMPK systemically to treat metabolic disease.

Proteínas Quinasas Activadas por AMP/metabolismo , Células Secretoras de Insulina/enzimología , Células Secretoras de Insulina/patología , Obesidad/enzimología , Adiposidad/genética , Adulto , Envejecimiento/patología , Proteína Relacionada con Agouti/metabolismo , Animales , Núcleo Arqueado del Hipotálamo/metabolismo , Metabolismo Energético/genética , Activación Enzimática , Conducta Alimentaria , Femenino , Heterocigoto , Humanos , Hiperfagia/complicaciones , Hiperfagia/enzimología , Hiperfagia/genética , Hiperfagia/patología , Hipotálamo/metabolismo , Insulina/metabolismo , Masculino , Ratones , Mitocondrias/metabolismo , Mutación/genética , Neuronas/metabolismo , Obesidad/sangre , Obesidad/complicaciones , Obesidad/patología , Fosforilación Oxidativa , Receptores de Ghrelina/metabolismo , Ribosomas/metabolismo , Transducción de Señal/genética , Transcriptoma/genética , Regulación hacia Arriba/genética
Magnes Res ; 16(4): 262-70, 2003 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-14979636


The aims of this study were to establish whether a magnesium (Mg) deficit indicated by a decreased urinary excretion exists and to determine whether 12-week oral Mg supplementation affects the Mg status and bronchodilator use in children with stable bronchial asthma. The effects of long-lasting Mg supplementation were investigated in 89 children 4 to 16 years of age with mild or moderate persistent bronchial asthma in a randomized, double-blind, placebo-controlled, prospective study. Each subject received one capsule of Mg citrate per day (= 7 years: 200 mg, > 7 years: 290 mg) or one capsule of placebo containing 260 mg glucose during 12 weeks. Evaluation was performed at 4-week intervals. Venous blood serum total and free Mg and urine Mg levels were determined at the beginning and end of the 12-week period. Parents recorded the number of bronchodilator doses twice daily. A urinary Mg loss (6.81 +/- 3.9 versus 2.79 +/- 1.39 mmol/day, p = 0.01) was observed in the placebo-treated persistent moderate asthmatics. Bronchodilator use was significantly higher after 8 and 12 weeks in the placebo-treated than in the Mg-treated patients with moderate asthma (31.1 +/- 1.8 versus 29.5 +/- 1.2 puffs per patient/4 weeks, p < 0.05, and 31.0 +/- 2.3 versus 29.3 +/- 0.9 puffs per patient/4 weeks, p < 0.05, respectively). Long-lasting Mg supplementation is clearly of benefit in mildly to moderately asthmatic children and is recommended as a concomitant drug in stable asthma.

Asma/tratamiento farmacológico , Asma/orina , Ácido Cítrico/uso terapéutico , Ácido Cítrico/orina , Suplementos Dietéticos , Compuestos Organometálicos/uso terapéutico , Compuestos Organometálicos/orina , Adolescente , Asma/sangre , Asma/fisiopatología , Broncodilatadores/farmacología , Broncodilatadores/uso terapéutico , Niño , Preescolar , Ácido Cítrico/administración & dosificación , Método Doble Ciego , Esquema de Medicación , Femenino , Volumen Espiratorio Forzado/efectos de los fármacos , Humanos , Masculino , Compuestos Organometálicos/administración & dosificación , Placebos