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  • 1
    Electronic Resource
    Electronic Resource
    Regulation of Estrogen Receptor and Progesterone Receptor Messenger Ribonucleic Acid by Estrogen in the Brain of the Whiptail Lizard (Cnemidophorus uniparens) (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neuroendocrinology 7 (1995), S. 0 
    Details
    ISSN: 1365-2826
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Receptive behavior in females vertebrates is controlled by hormones, principally estrogen, secreted by the ovary. Estrogen influences behavior by interacting with a specific estrogen binding protein, or receptor, located in target cells in certain hypothalamic nuclei. To better understand the molecular mechanisms involved in the control of receptive behavior in whiptail lizards, we investigated the effects of exogenous estrogen on t h e regulation of estrogen receptor and progesterone receptor expression in several regions of the brains of Cnernidophorus uniparens. First we determined a dosage of 17β-estradiol 3-benzoate (0.5 μg) which reliably induced receptive behavior in ovariectomized C. uniparens. Then using in situ hybridization, we examined the effects of that dosage on the expression of estrogen receptor and progesterone receptor mRNA in the brain 24 h after injection. Estrogen treatment resulted in a significant up-regulation of estrogen receptor mRNA expression in the ventromedial nucleus of the hypothalamus and torus semicircularis, down-regulation of estrogen receptor mRNA expression in the lateral septum, and no change in the periventricular nuclei of the hypothalamus, the periventricular nucleus of the preoptic area, and the dorsal hypothalamus. The same dosage resulted in increased progesterone receptor mRNA expression in the ventromedial nucleus of the hypothalamus and the periventricular nucleus of the preoptic area; no significant changes in progesterone receptor mRNA expression were observed in the periventricular nuclei of the hypothalamus or the torus semicircularis, although the differences in progesterone receptor expression in the torus semicircularis approached statistical significance. The up-regulation of estrogen receptor gene expression by estrogen in the ventromedial nucleus of the hypothalamus of lizards is opposite to that reported in female rats in which estrogen down-regulates estrogen receptor expression in the ventromedial nucleus of the hypothalamus. We propose that this may be related to differences in reproductive physiology between vertebrates which have extended follicular phases and prolonged periods of estrus and rats, which have an abbreviated follicular phase and brief periods of estrus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2826.1995.tb00674.x
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  • 2
    Electronic Resource
    Electronic Resource
    Gonadal Steroids have Paradoxical Effects on Brain Oxytocin Receptors (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neuroendocrinology 5 (1993), S. 0 
    Details
    ISSN: 1365-2826
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Specific brain receptors for oxytocin have been described in several mammalian species. The distribution of these receptors differs greatly across species and in the rat, receptor binding in specific brain regions appears to depend upon gonadal steroids. This study used in vitro receptor autoradiography to examine the effects of testosterone on oxytocin receptor binding in the mouse forebrain. Three groups of male mice were compared: castrates treated with blank capsules, castrates treated with testosterone filled capsules, and intact males. Irrespective of steroid treatment, the distribution of oxytocin receptors in mouse forebrain differed markedly from patterns previously described in the rat. In addition to these species differences in receptor distribution, testosterone had effects in the mouse which differed from the induction of receptors previously reported in the rat. In the mouse ventromedial nucleus of the hypothalamus, binding in the untreated castrate males was approximately double that observed in either the intact or the testosterone-treated castrates. In other regions of the mouse brain, such as the intermediate zone of the lateral septum, binding to oxytocin receptors was increased with testosterone treatment. These results suggest that the brain oxytocin receptor varies across species not only in its distribution but also in its regional regulation by gonadal steroids. These apparently paradoxical changes in oxytocin receptor binding may result from either direct or indirect effects of gonadal steroids in mouse brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2826.1993.tb00531.x
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  • 3
    Electronic Resource
    Electronic Resource
    Species Differences in Estrogen Receptor and Progesterone Receptor-mRNA Expression in the Brain of Sexual and Unisexual Whiptail Lizards (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neuroendocrinology 7 (1995), S. 0 
    Details
    ISSN: 1365-2826
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Circulating concentrations of gonadal steroid hormones and reproductive behavior in female vertebrates vary as a function of ovarian state. Steroids secreted by the ovary, specifically estrogen and progesterone, influence the expression of behaviors associated with reproduction by interacting with intracellular sex steroid receptors located in specific regions of the brain. Using in situ hybridization, we analyzed estrogen receptor and progesterone receptor messenger RNA expression in several brain regions of ovariectomized, vitellogenlc, and postovulatory individuals from two species of whiptail lizards (Cnemidophorus uniparens and C. inornatus). Although these species are genetically very similar, they differ in two aspects of their reproductive biology: (i) the unisexual C. uniparens alternate between expressing female-typical and male-like pseudosexual behaviors while female C. inornatus normally express only female receptive behavior, and (ii) circulating estradiol concentrations in reproductively active female C. uniparens are approximately five-fold lower than in reproductively active female C. inornatus. We found that the regulation of sex steroid receptor gene expression was region specific, with receptor-mRNA expression being increased, unchanged, or decreased during vitellogenesis depending on the area. Furthermore, Several species differences in the amount of sex steroid receptor-mRNA were found that may be relevant to the species differences in circulating estrogen concentrations and sexual behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2826.1995.tb00793.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Comparative Behavioral Endocrinology (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 474 (1986), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1986.tb28010.x
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  • 5
    Electronic Resource
    Electronic Resource
    Skin Lipids of Garter Snakes Serve as Semiochemicals (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 510 (1987), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1987.tb43594.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Mating-induced ovarian recrudescence in the red-sided garter snake (1990)
    Springer
    Journal of comparative physiology 166 (1990), S. 629-632 
    Details
    ISSN: 1432-1351
    Keywords: Neuroendocrine reflex ; Ovarian recrudescence ; Proximates cues
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the female red-sided garter snake (Thamnophis sirtalis parietalis) mating initiates a neuroendocrine reflex that has both a short-term (within hours) effect on circulating estrogen concentrations and a long-term (6–7 weeks) effect on ovarian development. The perception of mating appears at least facultative, if not obligatory, for the initiation and maintenance of vitellogenesis and hence successful reproduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00240012
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  • 7
    Electronic Resource
    Electronic Resource
    Female mimicry in garter snakes (1985)
    [s.l.] : Nature Publishing Group
    Nature 316 (1985), S. 59-60 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] On emergence from the winter den, female red-sided garter snakes are usually courted by 10-20, but sometimes as many as 100 males simultaneously, although only one male mates with the female13. Males begin to court females when rapid tongue-flicks by the male deliver pheromone cues from the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/316059a0
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Embryonic temperature determines adult sexuality in a reptile (1988)
    [s.l.] : Nature Publishing Group
    Nature 332 (1988), S. 832-834 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sexual behaviour in leopard geckos is stereotyped and differs between the sexes. The typical copulatory sequence consists of the male rapidly vibrating his tail on encountering a female. He will then approach the female, licking her tail. The male next grips and shakes the female's tail; this ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/332832a0
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  • 9
    Electronic Resource
    Electronic Resource
    Love potions (1992)
    [s.l.] : Nature Publishing Group
    Nature 359 (1992), S. 492-492 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] LOVE is the best known pheromone language, with males or females, or both, producing compounds that signal their readiness to mate. The message can be exceptionally subtle. A change in a single chemical bond can nullify an otherwise aphrodisiac odour or a particular arrangement of atoms can keep ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/359492a0
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of the seminal plug on mating behaviour in the garter snake (1977)
    [s.l.] : Nature Publishing Group
    Nature 267 (1977), S. 344-345 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Courtship and copulation in Thamnophis are readily identifiable behaviours. Male approach is visually guided7'8 and courtship behaviour is mediated by tongue-flick delivery of odour molecules to the vomeronasal organs as in trail-following2'3'7'9. The male orients to and approaches the female, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/267344a0
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