Localization of mRNA Encoding Thyrotropin-Releasing Hormone Precursor in the Brain of Sockeye Salmon

Ando, Hironori; Ando, Junko; Urano, Akihisa

doi:10.2108/zsj.15.945

Cited by 32 publications

(29 citation statements)

References 44 publications

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“…These main TRHir projections to the reticular regions have been reported for lampreys and teleosts [De Andrés et al, 2002;Díaz et al, 2001Díaz et al, , 2002. However, TRHir cells in the vagal motor nucleus of some teleosts [Ando et al, 1998;Díaz et al, 2001Díaz et al, , 2002 and rat [Segerson et al, 1987;Tsuruo et al, 1987;Heuer et al, 2000] were not found in amphibians. Finally, the TRHir cells found in the descending trigeminal nucleus of rat and dogfish [Tsuruo et al, 1987;Merchenthaler et al, 1988;Fleming and Todd, 1994;Heuer et al, 2000;Teijido et al, 2002] or within the spinal cord [Fleming and Todd, 1994;Heuer et al, 2000] seem to be unique to these species.…”

Section: Discussionmentioning

confidence: 51%

“…Species differences were also noted in teleosts where some species of salmonids possess TRHir cells in the olfactory bulbs [Matz and Takahashi, 1994;Ando et al, 1998;Díaz et al, 2001], whereas in the zebrafish and sea bass only scarce fiber labeling was observed [Batten et al, 1990a, b;Díaz et al, 2002]. Lampreys, however, lack TRHir structures in the olfactory bulbs and it was proposed that this would be the primitive character [De Andrés et al, 2002].…”

Section: Discussionmentioning

confidence: 99%

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Distribution of Thyrotropin-Releasing Hormone (TRH) Immunoreactivity in the Brain of Urodele Amphibians

Domı́nguez

López²,

González³

2008

Brain Behav Evol

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To improve knowledge of the peptidergic systems in the brain of amphibians we have conducted a comparative analysis of the distribution of TRH immunoreactive cell bodies and fibers in three species of urodeles. Fiber labeling was observed in all main brain subdivisions suggesting different control functions for TRH in extrahypothalamic systems. However, as in other vertebrates, TRH neurons were abundant in the hypothalamic nuclei that presumably project to the median eminence and the neural lobe of the hypophysis. Considerable interspecies differences were noted mainly related to innervation of the olfactory and visual centers (thalamus and mesencephalic tectum) and the precise localization of immunoreactive cell bodies, which was assessed by double labeling with tyrosine hydroxylase. The comparison of the distribution of TRH immunoreactive neurons and fibers found in urodeles with those reported for other vertebrates, in particular with anamniotes, reveals a strong resemblance but also notable variations not only across vertebrate classes but also within the same class. In this respect, the virtual lack in urodeles of TRH innervation of the intermediate lobe of the hypophysis clearly contrasts with the innervation found in anurans. Therefore, the important role of skin color adaptation proposed for TRH in anurans on the basis of the direct innervation of the intermediate lobe is not applicable for urodeles.

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Section: Discussionmentioning

confidence: 51%

Section: Discussionmentioning

confidence: 99%

Distribution of Thyrotropin-Releasing Hormone (TRH) Immunoreactivity in the Brain of Urodele Amphibians

Domı́nguez

López²,

González³

2008

Brain Behav Evol

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“…In trout, Dm is innervated by vasotocinergic fibers originating from the magnocellular preoptic nucleus (van den Dungen et al, 1982), and it is also richly innervated by thyrotropinreleasing hormone (TRH) -immunoreactive fibers (Díaz et al, 2001). TRH-expressing neurons have been demonstrated in locations including the Vs, Vp, the preoptic nucleus, the suprachiasmatic nucleus, the superior reticular nucleus, and the isthmic central gray (Matz and Takahashi, 1994;Ando et al, 1998;Díaz et al, 2001), all of which contain cells projecting to Dm (present results). Comparison of the nuclei afferent to Dm (present results) with these TRH-immunoreactive cell groups suggests that the rich TRHir innervation found in the Dm may arise from the preoptic nucleus and/or suprachiasmatic region, or (less probably) from TRH-immunoreactive nuclei of the isthmus.…”

Section: Connections Of the Medial Zone Of The Dorsal Telencephalon (Dm)mentioning

confidence: 99%

Experimental study of the connections of the telencephalon in the rainbow trout (Oncorhynchus mykiss). II: Dorsal area and preoptic region

Folgueira

Anadón

Yáñez

2004

J of Comparative Neurology

128

157

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In this study and the accompanying article (Folgueira et al., 2004a), the fluorescent carbocyanine dye 1,1'-dioctadecyl 3,3,3',3'-tetramethylindocarbocyanine perchlorate (DiI) was used in fixed tissue to comprehensively analyze the connections of the different regions of the telencephalic lobes and the preoptic region of the rainbow trout. Here, we analyze the connections of the dorsal area (D; pallium) of the telencephalon, and the preoptic region, as well as the telencephalic connections of several structures in the diencephalon and brainstem of juvenile trout. The dorsal plus dorsolateral pallial zone of D (Dd+Dl-d) receives afferents from contralateral Dd+Dl-d, the ventral area of the telencephalon, preoptic nucleus, suprachiasmatic nucleus, medial thalamus, preglomerular complex, anterior and lateral tuberal nuclei, posterior tuberal nucleus, posterior hypothalamic lobe, superior raphe nucleus, and the rhombencephalic central gray and reticular formation, and projects to the central zone of D (Dc), medial thalamus, and some caudomedial hypothalamic regions. The medial zone of D (Dm) maintains reciprocal connections with the preglomerular complex and also receives afferents from the preoptic nucleus, suprachiasmatic nucleus, anterior tuberal nucleus, preglomerular tertiary gustatory nucleus, posterior tubercle, superior raphe nucleus, locus coeruleus, and the rhombencephalic central gray, and reticular formation. Dc receives fibers mainly from Dd+Dl-d, preoptic nucleus, preglomerular complex, and torus semicircularis and projects to several extratelencephalic centers, including the paracommissural nucleus, optic tectum, torus semicircularis, thalamus, preglomerular complex, posterior tubercle nuclei, and inferior hypothalamic lobes. The posterior zone of D (Dp) is mainly connected with the olfactory bulbs, the ventral and supracommissural nuclei of the ventral area (subpallium), the preoptic nucleus, and the preglomerular complex and projects to wide hypothalamic and posterior tubercular regions. The preoptic nucleus projects to the olfactory bulb, to most regions of the telencephalic lobes, and to several diencephalic and brainstem structures. These results reveal complex and specialized connectional patterns in the rainbow trout dorsal telencephalon and preoptic region. Most of these connections have not been described previously in salmonids. These connections indicate that the salmonid telencephalon is involved in multisensorial processing and modulation of brain activity.

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“…Whereas an abundant TRHergic neuronal population has been reported in the olfactory bulbs of salmonids (Matz and Takahashi, 1994;Ando et al, 1998;Díaz et al, 2001) and rat (see Lechan et al, 1986;Tsuruo et al, 1988;Merchenthaler et al, 1988;Heuer et al, 2000), neither larval nor adult sea lampreys show any such population. Moreover, we have not observed TRHir fibers in the olfactory bulbs.…”

Section: Trhir Innervation Of the Brainmentioning

confidence: 94%

Distribution of thyrotropin‐releasing hormone immunoreactivity in the brain of larval and adult sea lampreys, Petromyzon marinus L.

Andrés

Anadón

Manso

et al. 2002

J of Comparative Neurology

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This study investigated the distribution of thyrotropin-releasing hormone-immunoreactive (TRHir) neurons and fibers in the brain and retina of lampreys. Our results in the brains of large larvae and upstream-migrating adults of the sea lamprey showed the presence of TRHir neurons mainly in the preoptic region and the hypothalamus. A few TRHir neurons were also found in the striatum. The number and staining intensity of TRHir neurons increased from larval stages to adulthood, and the distribution of TRHir populations was wider in adults. The TRHir fibers were more easily traced in adults. Some TRHir fibers entered the neurohypophysis, although most fibers coursed in the different regions of the brain, mostly in the basal region, from the forebrain to the hindbrain. The presence of TRHir stellate cells was observed in the adenohypophysis. In the retina of adult lampreys, but not in that of larvae, TRHir amacrine cells are present.

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Localization of mRNA Encoding Thyrotropin-Releasing Hormone Precursor in the Brain of Sockeye Salmon

Cited by 32 publications

References 44 publications

Distribution of Thyrotropin-Releasing Hormone (TRH) Immunoreactivity in the Brain of Urodele Amphibians

Distribution of Thyrotropin-Releasing Hormone (TRH) Immunoreactivity in the Brain of Urodele Amphibians

Experimental study of the connections of the telencephalon in the rainbow trout (Oncorhynchus mykiss). II: Dorsal area and preoptic region

Distribution of thyrotropin‐releasing hormone immunoreactivity in the brain of larval and adult sea lampreys, Petromyzon marinus L.

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