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    • Keywords


      Food intake; mRNA expression; NPY; Paralichthys orbignyanus

    • Abstract


      Neuropeptide Y (NPY) is considered the major stimulant for food intake in mammals and fish. Previous results indicate that NPY is involved in the feeding behaviour of the Brazilian flounder, Paralichthys orbignyanus. In this study, we evaluated hypothalamic NPY expression before (−2 h), during (0 h) and after feeding (+2 h) in two independent experiments: (1) during a normal feeding schedule and (2) in fish fasted for 2 weeks. During normal feeding, changes in the levels of NPY mRNA were periprandial, with expression levels being significantly elevated at meal time (𝑃 < 0.05) and significantly reduced 2 h later (𝑃< 0.05). Comparing the fasting and unfasted groups, NPY mRNA levels were significantly higher (𝑃 < 0.05) at −2 h and +2 h in the fasting group, but there was no difference at 0 h. In addition, the higher NPY mRNA levels that were observed in the fasting group were maintained throughout the sampling period. In summary, our results show that NPY expression was associated with meal time (0 h) in food intake regulation.

    • Author Affiliations


      Vinicius F Campos1 Ricardo B Robaldo2 João C Deschamps1 Fabiana K Seixas1 Alan John A McBride1 Luis Fernando Marins3 Marcelo Okamoto4 Luís A Sampaio4 Tiago Collares1

      1. Núcleo de Biotecnologia, Centro de Desenvolvimento Tecnológico, CP 354, 96010-900, Pelotas, RS, Brazil
      2. Departamento de Fisiologia e Farmacologia, Instituto de Biologia, Universidade Federal de Pelotas, CP 354, 96010-900, Pelotas, RS, Brazil
      3. Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, CP 474, 96201-900, Rio Grande, RS, Brazil
      4. Laboratório de Piscicultura Estuarina e Marinha, Instituto de Oceanografia, Universidade Federal do Rio Grande, CP 474, 96201-900, Rio Grande, RS, Brazil
    • Dates

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