Sexually dimorphic distribution of galanin in the preoptic area of red salmon, Oncorhynchus nerka

Jadhao, Arun G.; Meyer, Dietrich

doi:10.1007/s004410000278

Cited by 22 publications

(28 citation statements)

References 14 publications

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“…In contrast to these studies, Jadhao and Meyer (2000) did not observe any GAL cells in the NPO of red salmon males, whereas in females GAL-ir perikarya were noted in the NPO, located far lateral to the preoptic recess. As the NPO is known to be involved in the control of hormonal regulation by the pituitary influencing sexual mat- uration in teleosts (Peter and Fryer 1983), it is unlikely that NPO (which contains GAL-like peptide) is responsible for such functions in males (Prasada Rao et al 1996;Cornbrooks and Parsons 1991a) but not in females (Jadhao and Meyer 2000) or vice versa. So far, sexual dimorphism of GAL distribution has been reported in three species of teleosts only (see above), and the authors described contradictory results.…”

Section: Discussioncontrasting

confidence: 82%

“…In A. anableps, we have been able to distinguish as many as ten subgroups. Nevertheless, the present and all other investigations have emphasized the fact that GAL-ir neurons are primarily distributed within the subdivisions of NPO and NLT (Batten et al 1990b;Cornbrooks and Parsons 1991a;Holmqvist and Ekström 1991;Yamamoto et al 1992;Magliulo-Cepriano et al 1993;Anglade et al 1994;Prasada Rao et al 1996;Jadhao and Meyer 2000). In addition, all species investigated show the presence of intensely-ir GAL fiber projections in the NPO and NLT in both sexes.…”

Section: Discussionmentioning

confidence: 67%

“…In addition, all species investigated show the presence of intensely-ir GAL fiber projections in the NPO and NLT in both sexes. As in molly (Prasada Rao et al 1996), goldfish (Cornbrooks and Parsons 1991a), electric fish (Yamamoto et al 1992), rainbow trout (Anglade et al 1994) and red salmon (Jadhao and Meyer 2000), in A. anableps GAL-ir processes arising from NPP extend into the telencephalon.…”

Section: Discussionmentioning

confidence: 98%

“…In the eel, sex steroids enhance the brain level of GAL, with the magnitude of this increase depending upon the reproductive status of the animal (Olivereau and Olivereau 1991b). Furthermore, in some species, e.g., green molly, Poecilia latipinna (Cornbrooks and Parsons 1991a), goldfish, Carassius auratus (Prasada Rao et al 1996), and red salmon, Oncorhynchus nerka (Jadhao and Meyer 2000), a sexually dimorphic distribution of GAL immunoreactivity has been described within the preoptic area.…”

Section: Introductionmentioning

confidence: 96%

“…It was first isolated and characterized from the porcine intestine (Tatemoto et al 1983). Many studies have demonstrated the distribution of GAL-like immunoreactive (ir) neurons and fibers in the brain of mammals (Skofitsch and Jacobowitz 1985;Melander et al 1986;Levin et al 1987;Palkovits et al 1987;Blasco et al 1989;Gaymann and Martin 1989;Gentleman et al 1989;Walker et al 1989;Kordower and Mufson 1990;Meister et al 1990;Elmquist et al 1992;Kordower et al 1992), birds (Józsa and Mess 1993), reptiles (Jiménez et al 1994), amphibians (Wolfbauer and Skofitsch 1989;Lázár et al 1991;Olivereau and Olivereau 1992), bony and cartilaginous fish (Batten et al 1990a(Batten et al , 1990bParsons 1991a, 1991b;Holmqvist and Ekström 1991;Olivereau 1991a, 1991b;Vallarino et al 1991;Holmqvist and Carlberg 1992;Yamamoto et al 1992;Magliulo-Cepriano et al 1993;Anglade et al 1994;Prasada Rao et al 1996;Rodríguez-Gómez et al 2000;Jadhao and Meyer 2000), and the sea lamprey (Jiménez et al 1996). Furthermore, the distribution of GAL and its receptor-binding sites in the brain and pituitary are well documented in the rat (Meister and Hökfelt 1992), sea bass (Moons et al 1991), and Atlantic salmon (Holmqvist and Carlberg 1992).…”

Section: Introductionmentioning

confidence: 99%

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Galanin-like immunoreactivity in the brain and pituitary of the "four-eyed" fish, Anableps anableps

Jadhao

Pinelli

2001

Cell and Tissue Research

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The distribution of galanin (GAL)-like immunoreactivity was investigated in the brain and pituitary of the "four-eyed" fish, Anableps anableps. GAL-immunoreactive (GAL-ir) perikarya were located in the area ventralis telencephali pars supracommissuralis, nucleus preopticus periventricularis, nucleus preopticus pars parvocellularis, nucleus preopticus pars magnocellularis, nucleus lateralis tuberis ventralis, nucleus lateralis tuberis lateralis, and nucleus lateralis tuberis posterior. A few scattered, GAL-ir neurons were also observed in or adjacent to the nucleus recessus lateralis, nucleus recessus posterioris and lobus facialis (VII). GAL-ir fiber networks were widespread in the brain, with a comparatively higher density in the ventral telencephalic, preoptic and infundibular regions. The neurohypophysis showed GAL-ir innervation and there were GAL-ir cells in the adenohypophysis. The presence of GAL-ir cells in the hypothalamus and in the pituitary is an important asset for the supposed role of GAL-like peptide in neuroendocrine regulation of brain and pituitary functions.

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Section: Discussioncontrasting

confidence: 82%

Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Galanin-like immunoreactivity in the brain and pituitary of the "four-eyed" fish, Anableps anableps

Jadhao

Pinelli

2001

Cell and Tissue Research

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Development of galanin‐like immunoreactivity in the brain of the brown trout (Salmo trutta fario), with some observations on sexual dimorphism

Rodríguez

Anadón

Rodríguez‐Moldes

2003

J of Comparative Neurology

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The development of galanin-like immunoreactive (GAL-ir) cells and fibers was investigated in the brain of brown trout embryos, alevins, juveniles, and adults (some spontaneously releasing their gametes). The earliest GAL-ir neurons appeared in the preoptic region and the primordial hypothalamic lobe of 12-mm embryos. After hatching, new GAL-ir neurons appeared in the lateral, anterior, and posterior tuberal nuclei, and in late alevins, GAL-ir neurons appeared in the area postrema. In juveniles, further GAL-ir populations appeared in the nucleus subglomerulosus and magnocellular preoptic nucleus. The GAL-ir neuronal groups present in juveniles were also observed in sexually mature adults, although the area postrema of males lacked immunoreactive neurons. Moreover, spawning males exhibited GAL-ir somata in the olfactory bulb and habenula, which were never observed in adult females or in developing stages. In adults, numerous GAL-ir fibers were observed in the ventral telencephalon, preoptic area, hypothalamus, neurohypophysis, mesencephalic tegmentum, ventral rhombencephalon, and area postrema. Moderate to low GAL-ir innervation was seen in the olfactory bulbs, dorsomedial telencephalon, epithalamus, medial thalamus, optic tectum, cerebellum, and rhombencephalic alar plate. There were large differences among regions in the GAL-ir innervation establishment time. In embryos, GAL-ir fibers appeared in the preoptic area and hypothalamus, indicating early expression of galanin in hypophysiotrophic centers. The presence of galanin immunoreactivity in the olfactory, reproductive, visual, and sensory-motor centers of the brain suggest that galanin is involved in many other brain functions. Furthermore, the distribution of GAL-ir elements observed throughout trout development indicates that galaninergic system maturation continues until sexual maturity.

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Distribution of galanin‐like immunoreactivity in the brain of the Siberian sturgeon (Acipenser baeri)

Adrio¹,

Rodríguez²,

Rodríguez‐Moldes³

2005

J of Comparative Neurology

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Galanin is a 29-amino acid peptide widely distributed in the central nervous system of vertebrates. The organization of galaninergic systems is well known in teleosts, the most advanced actinopterygians, but no data are available on primitive bony fish. To extend the evolutionary analysis of galaninergic systems we studied the distribution of galanin-like immunoreactive (GAL-ir) cells and fibers in the sturgeon brain, since chondrosteans are among the most primitive extant actinopterygians. Double-immunolabeling experiments were performed to compare the distribution of galanin with that of neurophysin, tyrosine hydroxylase, and serotonin. Numerous GAL-ir cells of cerebrospinal fluid-contacting (CSF-C) type were found in the ventral telencephalon, preoptic area, and in the tuberal and caudal hypothalamus. The distribution of GAL-ir elements in the sturgeon brain shows many similarities to that observed in other vertebrates, but also important differences, such as the abundance of GAL-ir CSF-C cells, which appear to be a primitive characteristic. GAL-ir neurons observed in the sturgeon telencephalic hemispheres perhaps represent the basic organization of common ancestors of bony fishes and tetrapods. In the preoptic-hypophyseal system, GAL-ir cells appeared to be related not only with neurophysin-expressing neurons (in the tuberal hypothalamus) but also with serotoninergic and catecholamines-synthesizing neurons (in preoptic and tuberal nuclei). Numerous GAL-ir fibers were observed in the median eminence and neural lobe of the hypophysis, indicating that galanin may play a role in the modulation of hypophyseal secretion. GAL-ir neurons were absent from the sturgeon brainstem, suggesting that their presence in other vertebrates could represent an evolutionary recent acquisition.

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Sexually dimorphic distribution of galanin in the preoptic area of red salmon, Oncorhynchus nerka

Cited by 22 publications

References 14 publications

Galanin-like immunoreactivity in the brain and pituitary of the "four-eyed" fish, Anableps anableps

Galanin-like immunoreactivity in the brain and pituitary of the "four-eyed" fish, Anableps anableps

Development of galanin‐like immunoreactivity in the brain of the brown trout (Salmo trutta fario), with some observations on sexual dimorphism

Distribution of galanin‐like immunoreactivity in the brain of the Siberian sturgeon (Acipenser baeri)

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