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Abstract:

Using immunocytochemistry we have described the distribution and ontogeny of three distinct gonadotropin-releasing hormone (GnRH) neural systems, emphasizing the analysis during the period of sex differentiation in the South American cichlid fish Cichlasoma dimerus. In the forebrain a group of neurones immunoreactive to salmon GnRH that formed clusters in the nucleus olfacto retinalis (NOR), was located at the junction of the olfactory bulb and the telencephalon. These neurones differentiated 3 days after fertilization from the olfactory placodes. GnRH immunoreactive neurones along the olfactory nerves through the rostrobasal olfactory bulb were observed on day 4 and at the NOR on day 10. A group of neurones immunoreactive to chicken GnRH II was seen in the dorsal midbrain tegmentum. They originate from the ventricular ependyma between days 5 and 6. These neurones remained close to blood vessels throughout development. Between days 22 and 30 a group of neurones immunoreactive to seabream GnRH was detected in the anterior basal preoptic area. GnRH innervation of the pituitary was detected after the differentiation of preoptic neurones and in coincidence with gonadal differentiation. We hypothesize that the GnRH neural systems have three distinct embryonic origins. Furthermore, we show that the NOR and the midbrain GnRH neurones might have functions other than gonadal development, whereas the preoptic GnRH neurones in C. dimerus might be associated with gonadal sex differentiation.

Registro:

Documento: Artículo
Título:Ontogeny and distribution of gonadotropin-releasing hormone (GnRH) neuronal systems in the brain of the cichlid fish Cichlasoma dimerus
Autor:Pandolfi, M.; Parhar, I.S.; Ravaglia, M.A.; Meijide, F.J.; Maggese, C.M.; Paz, D.A.
Filiación:Laboratorio de Embriología Animal, Dpto. de Biodiversidad y Biologia Experimental, Ciudad Universitaria, (C1428EHA), Buenos Aires, Argentina
Department of Physiology, Nippon Medical School, Sendagi, Tokyo 113-8602, Japan
Instituto de Neurociencia (INEUCI-CONICET-UBA), Buenos Aires, Argentina
Palabras clave:Development; Differentiation; Olfactory placode; Teleost; Terminal nerve; gonadorelin; gonadorelin; animal tissue; article; Cichlasoma dimerus; controlled study; female; forebrain; gonad development; immunocytochemistry; immunoreactivity; male; nerve cell differentiation; nonhuman; olfactory bulb; olfactory nerve; ontogeny; priority journal; protein localization; sex differentiation; tegmentum; telencephalon; teleost; animal; brain; cell differentiation; cichlid; cytology; genetics; growth, development and aging; immunohistochemistry; larva; metabolism; nerve cell; physiology; preoptic area; Animal; Brain; Cell Differentiation; Cichlids; Gonadorelin; Immunohistochemistry; Larva; Neurons; Olfactory Bulb; Preoptic Area; Sex Differentiation; Support, Non-U.S. Gov't; Tegmentum Mesencephali; Animals; Cell Differentiation; Gonadotropin-Releasing Hormone; Immunohistochemistry; Larva; Olfactory Bulb; Preoptic Area; Sex Differentiation; Tegmentum Mesencephali; Animalia; Cichlasoma; Cichlidae; Gallus gallus; Teleostei
Año:2002
Volumen:205
Número:4
Página de inicio:271
Página de fin:281
DOI: http://dx.doi.org/10.1007/s00429-002-0253-x
Título revista:Anatomy and Embryology
Título revista abreviado:Anat. Embryol.
ISSN:03402061
CODEN:ANEMD
CAS:Gonadorelin, 33515-09-2; Gonadotropin-Releasing Hormone, 33515-09-2
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03402061_v205_n4_p271_Pandolfi

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Citas:

---------- APA ----------
Pandolfi, M., Parhar, I.S., Ravaglia, M.A., Meijide, F.J., Maggese, C.M. & Paz, D.A. (2002) . Ontogeny and distribution of gonadotropin-releasing hormone (GnRH) neuronal systems in the brain of the cichlid fish Cichlasoma dimerus. Anatomy and Embryology, 205(4), 271-281.
http://dx.doi.org/10.1007/s00429-002-0253-x
---------- CHICAGO ----------
Pandolfi, M., Parhar, I.S., Ravaglia, M.A., Meijide, F.J., Maggese, C.M., Paz, D.A. "Ontogeny and distribution of gonadotropin-releasing hormone (GnRH) neuronal systems in the brain of the cichlid fish Cichlasoma dimerus" . Anatomy and Embryology 205, no. 4 (2002) : 271-281.
http://dx.doi.org/10.1007/s00429-002-0253-x
---------- MLA ----------
Pandolfi, M., Parhar, I.S., Ravaglia, M.A., Meijide, F.J., Maggese, C.M., Paz, D.A. "Ontogeny and distribution of gonadotropin-releasing hormone (GnRH) neuronal systems in the brain of the cichlid fish Cichlasoma dimerus" . Anatomy and Embryology, vol. 205, no. 4, 2002, pp. 271-281.
http://dx.doi.org/10.1007/s00429-002-0253-x
---------- VANCOUVER ----------
Pandolfi, M., Parhar, I.S., Ravaglia, M.A., Meijide, F.J., Maggese, C.M., Paz, D.A. Ontogeny and distribution of gonadotropin-releasing hormone (GnRH) neuronal systems in the brain of the cichlid fish Cichlasoma dimerus. Anat. Embryol. 2002;205(4):271-281.
http://dx.doi.org/10.1007/s00429-002-0253-x