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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Intracerebroventricular injection of orexins does not stimulate food intake in neonatal chicks.

1. Recently, 2 novel neuropeptides were discovered, both derived from the same precursor by proteolytic processing, which bind and activate 2 closely related orphan G protein-coupled receptors, Named orexin-A and -B (Sakurai et al., 1998). Both stimulate food intake when administered centrally to rats. 2. Our aim was to elucidate whether central injection of mammalian orexin-A or -B stimulates food intake in the chick. 3. Under conditions of free access to food, orexin-A did not alter the food intake of chicks, but cumulative food intake was significantly suppressed by orexin-B. 4. The orexin-B was then administered to chicks deprived of food for 3 h to confirm its suppressive effect. No significant effect of orexin-B on food intake was detected. 5. Central injection of orexin-B did not modify food intake when appetite was stimulated by fasting. 6. Neither of these orexins appears to stimulate feeding in chicks.[1]


  1. Intracerebroventricular injection of orexins does not stimulate food intake in neonatal chicks. Furuse, M., Ando, R., Bungo, T., Ao, R., Shimojo, M., Masuda, Y. Br. Poult. Sci. (1999) [Pubmed]
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