Neuronal systems immunoreactive with antiserum to lamprey gonadotropin-releasing hormone in the brain of Petromyzon marinus

1988 ◽  
Vol 253 (1) ◽  
Author(s):  
JoanC. King ◽  
StaciaA. Sower ◽  
EdytheL.P. Anthony
Keyword(s):  
Petromyzon Marinus ◽  
Gonadotropin Releasing Hormone ◽  
Releasing Hormone ◽  
Neuronal Systems ◽  
The Brain

Distribution of lamprey gonadotropin-releasing hormone in the brain and pituitary gland of larval, metamorphic, and adult sea lampreys, Petromyzon marinus

1994 ◽  
Vol 72 (1) ◽  
pp. 48-53 ◽  
Author(s):  
Glenda M. Wright ◽  
Kim M. McBurney ◽  
John H. Youson ◽  
Stacia A. Sower
Keyword(s):  
Pituitary Gland ◽  
Preoptic Area ◽  
Petromyzon Marinus ◽  
Gonadotropin Releasing Hormone ◽  
Immunoperoxidase Technique ◽  
Dorsal Region ◽  
Releasing Hormone ◽  
Sea Lampreys ◽  
The Brain

Lamprey gonadotropin-releasing hormone was demonstrated in the brains of larval, metamorphic, and adult sea lampreys, Petromyzon marinus, using an immunoperoxidase technique. Gonadotropin-releasing hormone was observed in the neurohypophysis and preoptic area of the brain of larval, metamorphic, juvenile, and prespawning adults. The occurrence of immunoreactive cells and the intensity of the immunostaining was lowest in larvae, but by stage 5 of metamorphosis there was a marked increase in the prevalence and staining of these cells, which continued into adults. In larvae and lampreys in metamorphic stages 1–4, most immunoreactive fibres were confined to the dorsal region of the neurohypophysis. During stage 5 there was an expansion of immunopositive fibres into the ventral portion of the neurohypophysis. Prominent immunoreactivity was observed throughout the neurohypophysis from stage 5 onward through the adult stages. Changes in immunoreactivity of these cells and fibres in the brain and neurohypophysis correlate well with increased concentrations of hormone in the brain during development and with the timing of presumed changes in activity of cells in the adenohypophysis during metamorphosis.

Ontogeny and distribution of gonadotropin-releasing hormone (GnRH) neuronal systems in the brain of the cichlid fish Cichlasoma dimerus

2002 ◽  
Vol 205 (4) ◽  
pp. 271-281 ◽  
Author(s):  
Matías Pandolfi ◽  
Ishwar Parhar ◽  
Mario Ravaglia ◽  
Fernando Meijide ◽  
Cristina Maggese ◽  
...  
Keyword(s):  
Cichlid Fish ◽  
Gonadotropin Releasing Hormone ◽  
Releasing Hormone ◽  
Neuronal Systems ◽  
The Brain

scholarly journals Live View of Gonadotropin-Releasing Hormone Containing Neuron Migration

Endocrinology ◽  
2005 ◽  
Vol 146 (1) ◽  
pp. 463-468 ◽  
Author(s):  
Elizabeth P. Bless ◽  
Heather J. Walker ◽  
Kwok W. Yu ◽  
J. Gabriel Knoll ◽  
Suzanne M. Moenter ◽  
...  
Keyword(s):  
Real Time ◽  
Direct Evidence ◽  
Gonadotropin Releasing Hormone ◽  
Releasing Hormone ◽  
Reproductive Axis ◽  
Gnrh Neurons ◽  
Migratory Route ◽  
The Brain

Neurons that synthesize GnRH control the reproductive axis and migrate over long distances and through different environments during development. Prior studies provided strong clues for the types of molecules encountered and movements expected along the migratory route. However, our studies provide the first real-time views of the behavior of GnRH neurons in the context of an in vitro preparation that maintains conditions comparable to those in vivo. The live views provide direct evidence of the changing behavior of GnRH neurons in their different environments, showing that GnRH neurons move with greater frequency and with more changes in direction after they enter the brain. Perturbations of guiding fibers distal to moving GnRH neurons in the nasal compartment influenced movement without detectable changes in the fibers in the immediate vicinity of moving GnRH neurons. This suggests that the use of fibers by GnRH neurons for guidance may entail selective signaling in addition to mechanical guidance. These studies establish a model to evaluate the influences of specific molecules that are important for their migration.

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