IFIBYNE   05513
INSTITUTO DE FISIOLOGIA, BIOLOGIA MOLECULAR Y NEUROCIENCIAS
Unidad Ejecutora - UE
artículos
Título:
Distribution pattern of Neuropeptide Y in the brain, pituitary and olfactory system during the larval development of the toad Chaunus arenarum (Amphibia: Anura).
Autor/es:
HEER T; POZZI A; YOVANOVICH CA; PAZ DA
Revista:
ANATOMIA HISTOLOGIA EMBRYOLOGIA-JOURNAL OF VETERINARY MEDICINE SERIES C
Editorial:
Blackwell
Referencias:
Año: 2007
ISSN:
0340-2096
Resumen:
The spatiotemporal sequence of the appearance of NPY structure in the brain of Chaunus arenarum during development was studied by means of immunohistochemistry. The first NPY-immunoreactivity (-ir) in the central nervous system of Chaunus was obtained after hatching in the preoptic area, ventral thalamus and rhombencephalon. During premetamorphosis, NPY-ir cells were observed in the pallium, infundibulum and pars intermedia of the pituitary. Further maturation continued through prometamorphosis with the appearance of cell groups in the diagonal band, amygdala, preoptic nucleus, dorsal nucleus of the habenula, thalamus, suprachiasmatic nucleus, tuberculum posterior, tectum, torus semicircularis, interpeduncular nucleus and median eminence. During the metamorphic climax and soon after, the relative abundance of NPY-ir fibers in the brain decreased and no substantial change in the distribution of NPY-ir cells were observed. In the olfactory epithelium, nerve or bulb, neither cells nor NPY-ir fibers were found during any stage of development analyzed. The ontogeny pattern of the NPY-ir neuronal system in the brain of Ch. arenarum is more coincident to the spatiotemporal appearance reported for Rana than to that reported in Xenopus. Many NPY-ir fibers were found in the median eminence and pars intermedia of the pituitary, supporting the idea that NPY may play a role in the modulation of hypophyseal secretion during development.