Tail height, a prolactin-dependent ambisexual character in the newt (triturus cristatus carnifex Laur.)

Vellano, Camillo; Mazzi, V.; Sacerdote, Maria

doi:10.1016/0016-6480(70)90037-7

Cited by 40 publications

(5 citation statements)

References 6 publications

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“…Tail fin growth of several species of urodeles is also stimulated by PRL [17,22,23]. A broad tail with a welldeveloped fin is effective in the male for sending the courtship pheromonal substance by a water stream toward the female's snout.…”

Section: Discussionmentioning

confidence: 99%

Effect of Prolactin and Androgen on the Expression of the Female-Attracting Pheromone Silefrin in the Abdominal Gland of the Newt, Cynops ensicauda1

Iwata

Kawahara

Yamamoto

et al. 2000

Biology of Reproduction

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Silefrin is a sodefrin-like, female-attracting pheromone comprising 10 amino acids that was isolated from the abdominal gland of the sword-tailed newt, Cynops ensicauda. Hormonal effects on the silefrin precursor mRNA expression and silefrin content in the abdominal gland were investigated in the present study by using Northern blot analysis and radioimmunoassay, respectively. In the abdominal gland of newts treated with prolactin (PRL) plus testosterone propionate (TP), silefrin precursor mRNA expression was markedly enhanced as compared with that in the newts injected with saline, PRL, or TP. Values for radioimmunoassayable silefrin content in the abdominal gland paralleled those for the silefrin precursor mRNA levels. Moreover, silefrin precursor mRNA signals, as revealed by in situ hybridization, as well as stainability of immunoreactive silefrin were much more intense in the epithelial cells of the abdominal gland of the PRL-plus-TP-treated animals than in those of controls. We thus conclude that PRL and androgen are important factors for enhancing silefrin synthesis.

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Section: Discussionmentioning

confidence: 99%

Effect of Prolactin and Androgen on the Expression of the Female-Attracting Pheromone Silefrin in the Abdominal Gland of the Newt, Cynops ensicauda1

Iwata

Kawahara

Yamamoto

et al. 2000

Biology of Reproduction

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“…Hormonal regulation of secondary sex traits has been found in many vertebrates (e.g., Vellano et al, 1970;Kimball and Erpino, 1971;Lofts and Murton, 1973;Fernald, 1976;Tanner, 1978). Hormone production depends on nutrition; animals in poor condition often have lower levels of sex hormones (Wingfield, 1980), and probably partly for this reason develop relatively smaller secondary sex traits.…”

Section: Condition-dependence Ofmentioning

confidence: 99%

Evolution of Condition-Dependent Sex Ornaments and Mating Preferences: Sexual Selection Based on Viability Differences

Andersson¹

1986

Evolution

317

215

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. This content downloaded from 128.Abstract. -The possibility that the evolution of mating preferences and secondary sex traits can be based on heritable differences in viability is examined with a three-locus model. Earlier genetic models suggested that viability-based processes alone cannot explain the evolution of mate choice and sex ornaments that reduce survival; a Fisherian mating advantage seemed necessary. The present model is based on a monogamous mating system that precludes such a mating advantage.A key assumption is that ornament development depends on the phenotypic condition and overall genotype of the possessor; there is evidence that secondary sex traits often mirror nutritional status and health, sometimes through hormonal mediation. Ornament and preference can then hitchhike slowly to high frequency with alleles that confer a slight survival advantage, provided that such alleles become available often enough. The evolution of mating preferences and secondary sex traits that reflect overall genotypic constitution therefore can be based solely on viability differences, no Fisherian mating advantage being required. In practice, these and several other mechanisms of sexual selection may occur together.

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“…Prolactin apparently facilitates molting by stimulating the release of mucus which serves as a lubricant for the process (Dent et al, 1973;Dent, 1975). Alternatively, prolactin may inhibit the process of cornification by altering epidermal keratinization as reported in the crested newt (Vellano et al, 1970;Dent et al, 1973). Our data, although not addressing the role of thyroxine in molting, show that prolactin reduces the expression of glycoconjugates within epidermal keratinocytes as well as the intercellular space between those cells during the transition from rough to smooth skin.…”

Section: Discussionmentioning

confidence: 41%

“…In adult female red-spotted newts prolactin can likewise increase tail fin height, and can act synergistically with testosterone to produce male-like cloaca1 and toe pads (Zimmer and Dent, 1981). Integumental effects similar to those described for the redspotted newt have also been elicited by prolactin in the adult European crested newt, Triturus cristatus earnifex: (Vellano et al, 1970).…”

Section: Mentmentioning

confidence: 86%

Prolactin alters the expression of integumental glycoconjugates in the red‐spotted newt, Notophthalmus viridescens

Singhas

Ward

1993

Anat. Rec.

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Prolactin (PRL)-mediated changes in the texture and secretory activity of the skin in adult red-spotted newts may involve alterations in the distribution and/or expression of structural and secretory epidermal glycoconjugates. To explore this possibility, skin samples were obtained from groups of conditioned animals that had received injections of either ovine prolactin or amphibian saline over a 14-day period. Glycoconjugates within the epidermis and cutaneous glands were examined by means of lectin histochemistry using a panel of eight HRP-labelled lectins. PRL increased levels of sialic acid and n-acetylglucosamine in the stratum corneum. In contrast, glycoconjugates containing fucose, galactose, n-acetylgalactosamine, and galactose-(1,3)-n-acetylgalactosamine were decreased by PRL within both glands and epidermis. These results suggest that the integumental effects associated with prolactin in the red-spotted newt are mediated, at least in part, through the alteration of epidermal and glandular glycoconjugates.

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Tail height, a prolactin-dependent ambisexual character in the newt (triturus cristatus carnifex Laur.)

Cited by 40 publications

References 6 publications

Effect of Prolactin and Androgen on the Expression of the Female-Attracting Pheromone Silefrin in the Abdominal Gland of the Newt, Cynops ensicauda1

Effect of Prolactin and Androgen on the Expression of the Female-Attracting Pheromone Silefrin in the Abdominal Gland of the Newt, Cynops ensicauda1

Evolution of Condition-Dependent Sex Ornaments and Mating Preferences: Sexual Selection Based on Viability Differences

Prolactin alters the expression of integumental glycoconjugates in the red‐spotted newt, Notophthalmus viridescens

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