Possible hormonal interaction for eliciting courtship behavior in the male newt, Cynops pyrrhogaster

Toyoda, Fumiyo; Hasunuma, Itaru; Nakada, Tomoaki; Haraguchi, Shogo; Tsutsui, Kazuyoshi; Kikuyama, Sakaé

doi:10.1016/j.ygcen.2015.06.016

Cited by 7 publications

(6 citation statements)

References 41 publications

(58 reference statements)

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“…In the present study, the characterization and fate of proliferative cells in the POA of the diencephalon were not elucidated. However, in the POA, many neurons produce or elicit the release of hormones that regulate the courtship behavior, such as arginine vasotocin, prolactin, gonadotropins, and a neurosteroid 7α‐hydroxypregnenolone (Toyoda et al, 2015). Accordingly, POA is considered an important target for understanding the relationship between reproduction and neurogenesis.…”

Section: Discussionmentioning

confidence: 99%

“…Hormonal and pheromonal regulation of the reproductive behavior have been well analyzed in the Japanese red‐bellied newt ( Cynops pyrrhogaster ) (Kikuyama et al, 2003; Toyoda et al, 2015); thus, this species is thought to be suitable for investigating the relation between neurogenesis and reproduction. To elucidate the function of newly generated neurons, we investigated the proliferative and neurogenic zones in the brains of adult male newts using a combination of techniques for labeling proliferating cells with a thymidine analog and immunohistochemical staining.…”

Section: Introductionmentioning

confidence: 99%

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Cell proliferation and neurogenesis in the adult telencephalon of the newt Cynops pyrrhogaster

et al. 2022

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Urodele amphibians have the ability to regenerate several organs, including the brain.For this reason, the research on neurogenesis in these species after ablation of some parts of the brain has markedly progressed. However, detailed information on the characteristics and fate of proliferated cells as well as the function of newly generated neurons under normal conditions is still limited. In this study, we focused on

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cell proliferation and neurogenesis in the adult telencephalon of the newt Cynops pyrrhogaster

et al. 2022

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“…However, when the action of 7α‐OH PREG was nullified by an icv injection of ketoconazole, an inhibitor of the steroidogenic cytochrome P450 enzymes, none of the three hormones were successful in restoring the expression of tail vibrating behavior. Thus, it was concluded that AVT and the neurosteroid 7α‐OH PREG are essential factors for the expression of courtship behavior by the male newt (Toyoda et al, 2015).…”

Section: Hormonal and Pheromonal Control Of Reproduction In The Red‐b...mentioning

confidence: 99%

“…Instead, Mauthner cells were revealed to be equipped with AVT V1a receptors (Hasunuma et al, 2010). Since colocalization of AVT-like immunoreactivity and PRLR-immunoreactivity in the magnocellular nuclei in the newt hypothalamus is evident (Hasunuma et al, 2005(Hasunuma et al, , 2013 and it has been observed that the decline of the anti-PRL antibody-induced tail vibration behavior can be completely restored by AVT, it was concluded that AVT plays a key role in the expression of the courtship behavior (Toyoda et al, 2015).…”

Section: Hormones Eliciting Courtship Behaviormentioning

confidence: 99%

“…It is known that administration of PRL and gonadotropin elicits a sexually developed state in both sexes of red‐bellied newts (Toyoda et al, 1993), and the sexually developed male newts exhibit a unique courtship behavior toward the female partners (Houck, 1986; Kikuyama et al, 2003; Salthe & Mecham, 1974). Hormonal involvement in the courtship behavior of the male newts was analyzed (Toyoda et al, 1994, 2015; Toyoda & Kikuyama, 2000). Meanwhile, it was presumed that pheromones contribute to sex recognition and courtship behavior in the sexually developed red‐bellied newts (Toyoda et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

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Hormonal and pheromonal studies on amphibians with special reference to metamorphosis and reproductive behavior

et al. 2023

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In this article, we review studies which have been conducted to investigate the hormonal influence on metamorphosis in bullfrog (Rana catesbeiana) and Japanese toad (Bufo japonicus) larvae, in addition to studies conducted on the hormonal and pheromonal control of reproductive behavior in red‐bellied newts (Cynops pyrrhogaster). Metamorphosis was studied with an emphasis on the roles of prolactin (PRL) and thyrotropin (TSH). The release of PRL was shown to be regulated by thyrotropin‐releasing hormone (TRH) and that of TSH was evidenced to be regulated by corticotropin‐releasing factor. The significance of the fact that the neuropeptide that controls the secretion of TSH is different from those encountered in mammals is discussed in consideration of the observation that the release of TRH, which stimulates the release of PRL, is enhanced when the animals are subjected to a cold temperature. Findings that were made by using melanin‐rich cells of Bufo embryos and larvae, such as the determination of the origin of the adenohypophyseal primordium, identification of the pancreatic chitinase, and involvement of the rostral preoptic recess organ as the hypothalamic inhibitory center of α‐melanocyte‐stimulating hormone (α‐MSH) secretion, are mentioned in this article. In addition, the involvement of hormones in eliciting courtship behavior in male red‐bellied newts and the discovery of the peptide sex pheromones and hormonal control of their secretion are also discussed in the present article.

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Central regulation of reproduction in amphibians

Hasunuma

2023

J Exp Zool Pt A

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This review article includes a literature review of synteny analysis of the amphibian gonadotropin‐releasing hormone (GnRH) genes, the distribution of GnRH 1 and GnRH2 neurons in the central nervous system of amphibians, the function and regulation of hypophysiotropic GnRH1, and the function of GnRH1 in amphibian reproductive behaviors. It is generally accepted that GnRH is the key regulator of the hypothalamic–pituitary–gonadal axis. Three independent GnRH genes, GnRH1, GnRH2, and GnRH3, have been identified in vertebrates. Previous genome synteny analyses suggest that there are likely just two genes, gnrh1 and gnrh2, in amphibians. In three groups of amphibians: Anura, Urodela, and Gymnophiona, the distributions of GnRH1 and GnRH2 neurons in the central nervous system have also been previously reported. Moreover, these neuronal networks were determined to be structurally independent in all species examined. The somata of GnRH1 neurons are located in the terminal nerve, medial septum (MS), and preoptic area (POA), and some GnRH1 neurons in the MS and POA project into the median eminence. In contrast, the somata of GnRH2 neurons are located in the midbrain tegmentum. In amphibians, GnRH1 neurons originate from the embryonic olfactory placode, while GnRH2 neurons originate from the midbrain. The characterization and feedback regulation mechanisms of hypophysiotropic GnRH1 neurons in amphibians, the involvement of GnRH1 in amphibian reproductive behavior, and its possible mechanism of action should be elucidated in future.

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Possible hormonal interaction for eliciting courtship behavior in the male newt, Cynops pyrrhogaster

Cited by 7 publications

References 41 publications

Cell proliferation and neurogenesis in the adult telencephalon of the newt Cynops pyrrhogaster

Cell proliferation and neurogenesis in the adult telencephalon of the newt Cynops pyrrhogaster

Hormonal and pheromonal studies on amphibians with special reference to metamorphosis and reproductive behavior

Central regulation of reproduction in amphibians

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