Patterns of peripheral steroid metabolism vary with sex, season, and tissue type in blotched blue-tongued lizards (Tiliqua nigrolutea)

Edwards, Ashley; Jones, Susan; Davies, Noel W.

doi:10.1016/j.ygcen.2004.10.001

Cited by 10 publications

(6 citation statements)

References 61 publications

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“…In particular, T may be derivatized by reduction to DHT via the 5a-reductase enzyme, or aromatized to E 2 : for example, the epididymis, cloaca, and skin of the male lizard T. nigrolutea readily convert T to DHT (Edwards, Jones, & Davies, 2005). Even though it is considered a primary steroid, T secreted by the gonad may regularly be converted by peripheral tissues into more biologically active derivatives with greater affinity for the tissue receptors: such derivatives are, in effect, a more active form of the hormone.…”

Section: Peripheral Metabolism Of Steroidsmentioning

confidence: 99%

“…In female T. nigrolutea, steroid conjugates are produced by the skin, kidney, cloaca, skeletal muscle, adrenal, oviduct, and ovary, although the liver is the most active (Edwards et al, 2005). In female T. nigrolutea, steroid conjugates are produced by the skin, kidney, cloaca, skeletal muscle, adrenal, oviduct, and ovary, although the liver is the most active (Edwards et al, 2005).…”

Section: Peripheral Metabolism Of Steroidsmentioning

confidence: 99%

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Hormonal Regulation of Ovarian Function in Reptiles

Jones

2011

Hormones and Reproduction of Vertebrates

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Section: Peripheral Metabolism Of Steroidsmentioning

confidence: 99%

Section: Peripheral Metabolism Of Steroidsmentioning

confidence: 99%

Hormonal Regulation of Ovarian Function in Reptiles

Jones

2011

Hormones and Reproduction of Vertebrates

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“…Conspecific odours are important to both aggressive behaviour and ethological isolation among the three species . Moreover, Edwards et al (2005) suggested that the products of cloacal or epidermal steroid metabolism in Tiliqua nigrolutea may carry information relevant to reproductive condition or identification of individuals. In addition to these types of glands, Gabe and Saint-Girons (1965) also described the anal glands; in snakes these glands can be well-developed, they are present at the base of the tail and emit a musk odour as a defensive behaviour in some species.…”

Section: Vaginamentioning

confidence: 99%

“…Conspecific odours are important to both aggressive behaviour and ethological isolation among the three species (Cooper and Vitt 1987). Moreover, Edwards et al . (2005) suggested that the products of cloacal or epidermal steroid metabolism in Tiliqua nigrolutea may carry information relevant to reproductive condition or identification of individuals.…”

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confidence: 99%

Comparative histology of the vaginal–cloacal region in Squamata and its phylogenetic implications

2007

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Sánchez-Martínez, P.M., Ramírez-Pinilla, M.P. and Miranda-Esquivel, D.R. 2007. Comparative histology of the vaginal-cloacal region in Squamata and its phylogenetic implications. -Acta Zoologica (Stockholm) 88 : 289-307We described the histology and morphology of the vaginal-cloacal region in 18 species from 12 Squamata families. This comparative study revealed a wide variation in the cloacal morphology. Fifteen morphological characters were considered to be primary homology hypotheses and were optimized over the topology derived from the parsimony analysis of the available soft morphological evidence, including the characters described in this study. The synapomorphies optimized for Squamata are bifid urodaeum, common urodaeal cavity with similar histological features of the urodaeal horns, and presence of glands in the anterior urodaeum; for Scleroglossa the synapomorphy is the lateral position of the vaginal intrusion into the anterior urodaeal chamber, for Nyctisaura + Scincomorpha the synapomorphy is the presence of a bifid posterior urodaeum; and for Xantusidae + Annulata it is the presence of simple glands in the anterior urodaeum. The central position of the vaginal intrusion into the urodaeal chamber and the intraepithelial position of the glandular unit in the anterior urodaeum behave as autapomorphies for Iguanidae. This study contributes evidence that defines the relationships within Scleroglossa. Cloacal features provide interesting information that is useful as a source of morphological characters for phylogenetic studies in Squamata.

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“…The seasonal changes observed in wild females could have been related to changing estradiol levels, and exogenous T may have been converted to estradiol. Steroid hormone metabolism can take place in the brain to affect behavior (Riters et al, 2001), as well as in peripheral tissues (Edwards et al, 2005), and the abundance of the enzymes involved in this conversion can vary seasonally (Soma et al, 2003). Thus, the inability of our T implant study to replicate volatile compound concentrations observed in breeding birds may be related to differences in concentration of other hormones like melatonin and thyroxine, or a lack of 5α-reductase in males, the quantity of which is known to be decreased in non-breeding birds (Soma et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

Role of Testosterone in Stimulating Seasonal Changes in a Potential Avian Chemosignal

et al. 2011

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Songbird preen oil contains volatile and semivolatile compounds that may contain information about species, sex, individual identity, and season. We examined the relationship between testosterone (T) and the amounts of preen oil volatile and semivolatile compounds in wild and captive dark-eyed juncos (Junco hyemalis). In wild males and females, we observed an increase in volatile compound relative concentration early in the breeding season. This increase mirrored previously described seasonal elevation in T levels in wild males and females, suggesting a positive relationship between hormone levels and preen gland secretions, and a possible role for these secretions in signaling receptivity. In females, the greatest relative concentrations of most compounds were observed close to egg laying, a time when steroid hormones are high and also the only time that females respond to an injection of gonadotropin-releasing hormone with a short-term increase in T. In a study of captive juncos held on short days, we asked whether the seasonal increases observed in the wild could be induced with experimental elevation of T alone. We found that exogenous T stimulated the production of some volatile compounds in non-breeding individuals of both sexes. However, of the 15 compounds known to increase during the breeding season, only four showed an increase in relative concentration in birds that received T implants. Our results suggest that testosterone levels likely interact with other seasonally induced physiological changes to affect volatile compound amounts in preen oil.

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Patterns of peripheral steroid metabolism vary with sex, season, and tissue type in blotched blue-tongued lizards (Tiliqua nigrolutea)

Cited by 10 publications

References 61 publications

Hormonal Regulation of Ovarian Function in Reptiles

Hormonal Regulation of Ovarian Function in Reptiles

Comparative histology of the vaginal–cloacal region in Squamata and its phylogenetic implications

Role of Testosterone in Stimulating Seasonal Changes in a Potential Avian Chemosignal

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