Hormones and the Female Reproductive System of Amphibians

Aranzábal, Mari Carmen Uribe

doi:10.1016/b978-0-12-374932-1.00017-2

Cited by 7 publications

(10 citation statements)

References 85 publications

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“…This gonadotropin-releasing hormone is a peptide hormone responsible for the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the anterior pituitary in vertebrates (Norris & Carr, 2020). In amphibians, FSH and LH regulate hormone steroid secretion (progesterone, 17β-estradiol, testosterone and 5a-dihydrotestosterone), gametogenesis and mating behaviour (Aranzábal, 2011;Moore, 1987;Propper, 2011). Mutations on this gene could modulate breeding effort in both sexes along the temperature gradient and might be involved in the temperature-related life-history patterns highlighted in our demographic analyses.…”

Section: Genomic Signatures Of Thermal Adaptationmentioning

confidence: 92%

Genomic signatures of thermal adaptation are associated with clinal shifts of life history in a broadly distributed frog

Cayuela

Dorant

Forester

et al. 2021

Journal of Animal Ecology

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Section: Genomic Signatures Of Thermal Adaptationmentioning

confidence: 92%

Genomic signatures of thermal adaptation are associated with clinal shifts of life history in a broadly distributed frog

Cayuela

Dorant

Forester

et al. 2021

Journal of Animal Ecology

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“…The role of gonadal steroids in oogenesis has not been the subject of detailed study in ovariparous salamanders, but is presumed to follow the pattern established in frogs in which estradiol levels are generally low at the beginning of oogenesis and gradually increase until the time of ovulation [54]. Estradiol causes the release of vitellogenin, and is therefore necessary for deposition of yolk in eggs [54].…”

Section: Androgens Estradiol and Reproduction In Salamandersmentioning

confidence: 99%

“…Estradiol causes the release of vitellogenin, and is therefore necessary for deposition of yolk in eggs [54]. Estradiol is also necessary, but not sufficient, to stimulate production of the jelly coat in oviducts of female Cynops [29].…”

Section: Androgens Estradiol and Reproduction In Salamandersmentioning

confidence: 99%

“…On the other hand, estradiol levels are also frequently associated with an increase in the mass of ovaries and oviducts and the production of vitellogenin, which are energetically expensive events [54]. In A. opacum, females with greater access to food are more likely to be reproductive, have larger clutch sizes, produce larger eggs, and invest their eggs with more lipids than do females given moderate or low access to food [47].…”

Section: External Factors Influencing Reproduction In Female Axolotlsmentioning

confidence: 99%

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Ambiguities in the relationship between gonadal steroids and reproduction in axolotls (Ambystoma mexicanum)

Eisthen

Krause

2012

General and Comparative Endocrinology

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Axolotls (Ambystoma mexicanum) are aquatic salamanders that are widely used in research. Axolotls have been bred in laboratories for nearly 150 years, yet little is known about the basic biology of reproduction in these animals. We investigated the effects of changing day length, time of year, and food availability on levels of circulating estradiol and androgens in adult female and male axolotls, respectively. In addition, we examined the effects of these variables on the mass of ovaries, oviducts, and eggs in females and weight, to calculate a form of gonadosomatic index (GSI). In both sexes, GSI was not correlated with levels of circulating steroids. In female axolotls, estradiol levels were influenced by food availability, changes in day length, and season, even when animals were held at a constant temperature and day length was decorrelated with calendar date. In addition, the mass of ovaries, oviducts, and eggs varied seasonally, peaking in the winter months and declining during the summer months, even though our animals were not breeding and shedding eggs. In males, levels of androgens appeared to vary independently of external conditions, but GSI varied dramatically with changes in day length. These results suggest that reproduction in axolotls may vary seasonally, as it does in many other ambystomid species, although both male and female axolotls are capable of reproducing several times each year. The physiological basis of this ability remains enigmatic, given the indications of seasonality contained in our data. IntroductionThe axolotl (Ambystoma mexicanum) is a paedomorphic salamander: it becomes sexually mature while retaining many morphological characteristics of the larval form.Axolotls were first brought to Europe in 1863, where they generated much interest for their ability to reproduce while resembling aquatic larvae, and then in some cases to metamorphose into an animal resembling a common terrestrial salamander, which was equally capable of reproducing [50]. Since their introduction to the research community, axolotls have become a model organism for biological research, used primarily in studies of embryology and regeneration.The natural history of axolotls is poorly understood. Axolotls are native to two lakes, Xochimilco and Chalco, which have been subsumed by present-day Mexico City. Human alteration of this habitat for agricultural purposes dates back hundreds of years [7]; their environment is now so badly degr on IUCN Red List. Recent studies indicate that few individuals exist in the wild [e.g., 12], and it seems likely that the ecology and natural history of axolotls will never be known.Given that axolotls have been bred in laboratories for nearly 150 years, it is perhaps particularly surprising that their reproductive patterns have not been thoroughly documented. Their courtship behaviors [18] and the anatomy of both male and female reproductive systems have been described [38,56], but the physiology of reproduction in axolotls has not been explored. In this study, we measu...

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“…The use of antibodies directed against estriol and 17β-estradiol has shown that labeling is mainly observed in granulosa of follicles containing vitellogenic oocytes [ 15 ]. Finally, the use of radioactive pregnenolone has shown that corpora lutea have an endocrine activity linked to pregnancy, like in other viviparous gymnophiona [ 16 , 17 ]. As in other amphibians, reproduction in female is under pituitary control [ 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Localization of Receptors for Sex Steroids and Pituitary Hormones in the Female Genital Duct throughout the Reproductive Cycle of a Viviparous Gymnophiona Amphibian, Typhlonectes compressicauda

Brun¹,

Exbrayat

Raquet³

2020

Animals

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Reproduction in vertebrates is controlled by the hypothalamo-pituitary-gonadal axis, and both the sex steroid and pituitary hormones play a pivotal role in the regulation of the physiology of the oviduct and events occurring within the oviduct. Their hormonal actions are mediated through interaction with specific receptors. Our aim was to locate α and β estrogen receptors, progesterone receptors, gonadotropin and prolactin receptors in the tissues of the oviduct of Typhlonectes compressicauda (Amphibia, Gymnophiona), in order to study the correlation between the morphological changes of the genital tract and the ovarian cycle. Immunohistochemical methods were used. We observed that sex steroids and pituitary hormones were involved in the morpho-functional regulation of oviduct, and that their cellular detection was dependent on the period of the reproductive cycle.

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Hormones and the Female Reproductive System of Amphibians

Cited by 7 publications

References 85 publications

Genomic signatures of thermal adaptation are associated with clinal shifts of life history in a broadly distributed frog

Genomic signatures of thermal adaptation are associated with clinal shifts of life history in a broadly distributed frog

Ambiguities in the relationship between gonadal steroids and reproduction in axolotls (Ambystoma mexicanum)

Localization of Receptors for Sex Steroids and Pituitary Hormones in the Female Genital Duct throughout the Reproductive Cycle of a Viviparous Gymnophiona Amphibian, Typhlonectes compressicauda

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