Extrahypothalamic projection of luteinizing hormone-releasing hormone fibers in the brain of the toad, Bufo japonicus

Jokura, Yoji; Urano, Akihisa

doi:10.1016/0016-6480(86)90096-1

Cited by 20 publications

(8 citation statements)

References 18 publications

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“…1992] and dorsal pallium [Neary, 1990], and little is known of the inputs to the medial septal nucleus, other than affer ents from the medial pallium [Halpern, 1972;Kokoros, 1973;Neary, 1990;Northcutt and Ronan, 1992], The dis tribution of labelled cells in the median septum overlapped the distribution of gonadotropin-releasing hormone (GnRH) immunoreactive cells in the caudal telencephalon [Crim, 1985;Muskie and Moore, 1988). This overlap is consistent with evidence that GnRH-positivc cells in the caudal telen cephalon contribute to the GnRH-positive fiber plexus in the infundibular hypothalamus [Jokura and Urano, 1986].…”

Section: Telencephalonsupporting

confidence: 76%

Afferent Projections to the Hypothalamus in Ranid Frogs

Neary¹

1995

Brain Behav Evol

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Hypothalamic afferents were examined following applications of wheat germ agglutinin-horseradish peroxidase in the infundibulum of bullfrogs (Rana catesbeiana). Neuronal populations were generally labelled bilaterally, with an ipsiIateral predominance. In the telencephalon, most labelled cells were present in the medial pallium, ventral lateral pallium, lateral amygdala, and lateral septal nucleus. A moderate number of cells were found in the medial amygdala and fewer still in the caudal striatum, olfactory tubercle/diagonal band nucleus, medial septal nucleus, and median septum. In the diencephalon, labelled neurons were primarily found in the anterior and central thalamic nuclei, anterior preoptic area, and suprachiasmatic nucleus. Fewer cells were present in the ventral habenular nucleus, anterior division of the lateral thalamic nucleus, posterior thalamic nucleus, ventromedial thalamic nucleus, magnocellular preoptic nucleus, posterior entopeduncular nucleus, and along the medial forebrain bundle. In the midbrain, a few labelled cells were found in the nucleus of the medial longitudinal fasciculus, suprapeduncular nucleus, and posteroventral tegmental nucleus. The secondary isthmal nucleus contained a large number of labelled neurons and moderate numbers of labelled cells were present in the grey medial to nucleus isthmi and in the isthmal raphe. A few lightly labelled cells were also seen in the parabrachial nucleus. Finally, after the largest applications, a few cells were seen in the obex region ventrolateral to the solitary tract.

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Section: Telencephalonsupporting

confidence: 76%

Afferent Projections to the Hypothalamus in Ranid Frogs

Neary¹

1995

Brain Behav Evol

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“…A notable difference between the present study and previous studies of other amphibians (Jokura and Urano, 1987) and rodents Castel and Morris, 1988;Dubois-Dauphin et al, 1989) is that, in T. granulosa, we did not observe dense plexuses of VTir fibers within the lateral septum. It is unclear whether this is a result of differences in nomenclature identifying the lateral septum in urodele amphibians or whether this is a true species difference.…”

Section: Vtir Fiberscontrasting

confidence: 75%

“…More recent immunohistochemical (IHC) studies have demonstrated that VTir cells and fibers are widely distributed throughout hypothalamic and extrahypothalamic regions of anuran amphibians (Tonon et al, 1985;Jokura and Urano, 1987;Gonzá lez and Smeets, 1992a,b), reptiles (Ferná ndez-Llebrez et al, 1988;Propper et al, 1992), and birds (Kiss et al, 1987;Panzica et al, 1988). In contrast, the distribution of VT immunoreactivity in urodele amphibians is considered to be more restricted (Fasolo and Gaudino, 1981;Gonzá lez and Smeets, 1992a).…”

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confidence: 96%

Neuroanatomical distribution of vasotocin in a urodele amphibian (Taricha granulosa) revealed by immunohistochemical and in situ hybridization techniques

et al. 1997

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Immunohistochemical and in situ hybridization techniques were used to investigate the neuroanatomical distribution of arginine vasotocin-like systems in the roughskin newt (Taricha granulosa). Vasotocin-like-immunoreactive neuronal cell bodies were identified that, based on topographical position, most likely, are homologous to groups of vasopressin-immunoreactive neuronal cell bodies described in mammals, including those in the bed nucleus of the stria terminalis, medial amygdala, basal septal region, magnocellular basal forebrain-including the horizontal limb of the diagonal band of Broca, paraventricular and supraoptic nuclei, suprachiasmatic nucleus, and dorsomedial hypothalamic nucleus. Several additional vasotocin-like-immunoreactive cell groups were observed in the forebrain and brainstem regions; these observations are compared with previous studies of vasotocin- and vasopressin-like systems in vertebrates. Arginine vasotocin-like-immunoreactive fibers and presumed terminals also were widely distributed with high densities in the basal limbic forebrain, the ventral preoptic and hypothalamic regions, and the brainstem ventromedial tegmentum. Based on in situ hybridization studies with synthetic oligonucleotide probes for vasotocin and the related neuropeptide mesotocin, as well as double-labeling studies with combined immunohistochemistry and in situ hybridization, we conclude that the vasotocin immunohistochemical procedures used identify vasotocin-like, but not mesotocin-like, elements in the brain of T. granulosa. The distribution of arginine vasotocin-like systems in T. granulosa is greater than the distribution previously reported for any other single vertebrate species; however, it is consistent with an emerging pattern of distribution of vasotocin- and vasopressin-like peptides in vertebrates. Complexity in the vasotocinergic system adds further support to the conclusion that this peptide regulates multiple neurophysiological and neuroendocrinological functions.

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“…Within these two orders, strong evidence exists for the presence of mammalian GnRH-like (mGnRH) immunoreactivity [e.g. DoerrSchott and Dubois, 1975;Alpert et al, 1976;Doerr-Schott, 1976;Goos et al, 1976;Kubo et al, 1979;Nozaki and Kobayashi, 1979;Jokura and Urano, 1986;Murakami et al, 1992] and cIIGnRH-like immunoreactivity [e.g. Muske andMoore, 1990, 1994].…”

Section: Introductionmentioning

confidence: 99%

Immunocytochemical Localization of Gonadotropin-Releasing Hormones in the Brain of a Viviparous Caecilian Amphibian, <i>Typhlonectes natans</i> (Amphibia: Gymnophiona)

Ebersole

Boyd

2000

Brain Behav Evol

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The molecular forms and brain distribution of gonadotropin-releasing hormone (GnRH) have been well studied in the amphibian orders Urodela (salamanders and newts) and Anura (frogs and toads). In the order Gymnophiona (caecilians), however, few species have been investigated. Antibodies against different molecular forms of GnRH were used to immunohistochemically localize the GnRH-containing neurons in the brain of the caecilian, Typhlonectes natans which differs from most other amphibians in that it is viviparous. An antibody selective for mammalian GnRH recognized cell bodies predominantly in the septo-preoptic area but only with occasional cell bodies in the lateral hypothalamus and ventral thalamic eminence. Thick, prominent fibers in the septal region and fibers within the terminal nerve were also labeled. An antibody selective for chicken-II GnRH labeled a population of cell bodies in the dorsal hypothalamus, ventral thalamus and midbrain tegmentum. Thin fibers projected laterally from these cells. An antibody specific for salmon GnRH did not label cell bodies but did show intense terminal field immunoreactivity. The brain of this caecilian, therefore, contains three antigenically distinct forms of GnRH. The mammalian and chicken-II GnRH peptides have been shown in other amphibians but the distribution of cells and fibers was unique in this caecilian.

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Extrahypothalamic projection of luteinizing hormone-releasing hormone fibers in the brain of the toad, Bufo japonicus

Cited by 20 publications

References 18 publications

Afferent Projections to the Hypothalamus in Ranid Frogs

Afferent Projections to the Hypothalamus in Ranid Frogs

Neuroanatomical distribution of vasotocin in a urodele amphibian (Taricha granulosa) revealed by immunohistochemical and in situ hybridization techniques

Immunocytochemical Localization of Gonadotropin-Releasing Hormones in the Brain of a Viviparous Caecilian Amphibian, <i>Typhlonectes natans</i> (Amphibia: Gymnophiona)

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