Central l-arginine reduced stress responses are mediated by l-ornithine in neonatal chicks (original) (raw)

Summary.

Recently, we observed that central administration of l-arginine attenuated stress responses in neonatal chicks, but the contribution of nitric oxide (NO) to this response was minimal. The sedative and hypnotic effects of l-arginine may be due to l-arginine itself and/or its metabolites, excluding NO. To clarify the mechanism, the effect of intracerebroventricular (i.c.v.) injection of l-arginine metabolites on behavior under social separation stress was investigated. The i.c.v. injection of agmatine, a guanidino metabolite of l-arginine, had no effect during a 10 min behavioral test. In contrast, the i.c.v. injection of l-ornithine clearly attenuated the stress response in a dose-dependent manner, and induced sleep-like behavior. The l-ornithine concentration in the telencephalon and diencephalon increased following the i.c.v. injection of l-arginine. In addition, several free amino acids including L-alanine, glycine, l-proline and l-glutamic acid concentrations increased in the telencephalon. In conclusion, it appears that l-ornithine, produced by arginase from l-arginine in the brain, plays an important role in the sedative and hypnotic effects of l-arginine observed during a stress response. In addition, several other amino acids having a sedative effect might partly participate in the sedative and hypnotic effects of l-arginine.

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Authors and Affiliations

  1. Laboratory of Advanced Animal and Marine Bioresources, Graduate School of Bioresources and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
    R. Suenaga, H. Yamane, S. Tomonaga, M. Asechi, N. Adachi, Y. Tsuneyoshi, I. Kurauchi & M. Furuse
  2. Ajinomoto Co. Inc., Kawasaki-ku, Kawasaki-shi, Japan
    H. Sato
  3. Department of Animal and Poultry Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, U.S.A.
    D. M. Denbow

Authors

  1. R. Suenaga
  2. H. Yamane
  3. S. Tomonaga
  4. M. Asechi
  5. N. Adachi
  6. Y. Tsuneyoshi
  7. I. Kurauchi
  8. H. Sato
  9. D. M. Denbow
  10. M. Furuse

Additional information

Authors’ address: M. Furuse, PhD, Laboratory of Advanced Animal and Marine Bioresources, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka 812-8581, Japan

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Suenaga, R., Yamane, H., Tomonaga, S. et al. Central l-arginine reduced stress responses are mediated by l-ornithine in neonatal chicks.Amino Acids 35, 107–113 (2008). https://doi.org/10.1007/s00726-007-0617-x

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