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Karnani, Mahesh M.; Apergis-Schoute, John; Adamantidis, Antoine; Jensen, Lise T.; de Lecea, Luis; Fugger, Lars; Burdakov, Denis
Neuron (Cambridge, Mass.), 11/2011, Letnik: 72, Številka: 4Journal Article
Hypothalamic orexin/hypocretin (orx/hcrt) neurons regulate energy balance, wakefulness, and reward; their loss produces narcolepsy and weight gain. Glucose can lower the activity of orx/hcrt cells, but whether other dietary macronutrients have similar effects is unclear. We show that orx/hcrt cells are stimulated by nutritionally relevant mixtures of amino acids (AAs), both in brain slice patch-clamp experiments, and in c-Fos expression assays following central or peripheral administration of AAs to mice in vivo. Physiological mixtures of AAs electrically excited orx/hcrt cells through a dual mechanism involving inhibition of KATP channels and activation of system-A amino acid transporters. Nonessential AAs were more potent in activating orx/hcrt cells than essential AAs. Moreover, the presence of physiological concentrations of AAs suppressed the glucose responses of orx/hcrt cells. These results suggest a new mechanism of hypothalamic integration of macronutrient signals and imply that orx/hcrt cells sense macronutrient balance, rather than net energy value, in extracellular fluid. ► Brain orexin/hypocretin cells are stimulated by dietary amino acids (AAs) ► AA sensing involves K-ATP channels and system-A transporters ► Nonessential AAs stimulate orexin/hypocretin cells more than essential AAs ► AA presence prevents glucose from blocking orexin/hypocretin cells
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Dostop do baze podatkov JCR je dovoljen samo uporabnikom iz Slovenije. Vaš trenutni IP-naslov ni na seznamu dovoljenih za dostop, zato je potrebna avtentikacija z ustreznim računom AAI.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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