Localization of Neuropeptide Y-like immunoreactive structures in the brain of the pejerrey, Odontesthes bonariensis (Teleostei, Atheriniformes).
The aim of this study was to determine the distribution of Neuropeptide-Y (NPY) immunoreactive neurons and fibres in the brain and pituitary of Odontesthes bonariensis by immunohistochemical methods. A wide distribution of immunoreactive NPY (ir-NPY) cells and fibres in the forebrain and midbrain was observed. A prominent ir-NPY nucleus was found in the ventral telencephalon and other ir-NPY cells groups were recognized at the dorso-medial telencephalon. The diencephalon showed ir-NPY cells in the Nucleus entopeduncularis, the Nucleus preopticus periventricularis and in the Nucleus lateralis tuberis. Ir-NPY fibres were conspicuous in the preoptic region and the hypothalamus. There were also numerous ir-NPY fibres at the epithalamic level running ventrally to the hypothalamus and the pituitary stalk. At the rhomboencephalic level, the ir-NPY neurons were observed in the Locus coeruleus. Double-labelled immunostaining showed a close association between ir-NPY fibres that reach the adenohypophysis and growth hormone (GH)- and gonadotropin (GtH)-expressing cells. Although our results exhibit some relevant differences when compared to other fish groups, they support the existence of a conserved NPY system in teleosts.
Laboratorio de Embriología Animal, Departamento de Biologia, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria (C1428EHA), Buenos Aires, Argentina.
J M
JM
Traverso
M A
MA
Ravaglia
P G
PG
Vissio
M C
MC
Maggese
D A
DA
Paz
D000818:Animals; D001921:Brain / Q000033:anatomy & histology*; D001923:Brain Chemistry / Q000502:physiology*; D005399:Fishes / Q000033:anatomy & histology*; D007150:Immunohistochemistry / Q000662:veterinary; D009412:Nerve Fibers / Q000737:chemistry; D009474:Neurons / Q000737:chemistry; D009478:Neuropeptide Y / Q000302:isolation & purification*; D010902:Pituitary Gland / Q000378:metabolism
D009478:Neuropeptide Y