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See detailEstradiol, a key endocrine signal in the sexual differentiation and activation of reproductive behavior in quail
Balthazart, Jacques ULg

in Comparative Biochemistry & Physiology Part A : Molecular & Integrative Physiology (2007, August), 148(Suppl. 1), 27

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See detailEstradiol, a key endocrine signal in the sexual differentiation and activation of reproductive behavior in quail.
Balthazart, Jacques ULg; Cornil, Charlotte ULg; Charlier, Thierry ULg et al

in Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology (2009), 311(5), 323-45

In Japanese quail, estrogen's effects on sexual behavior can be divided into three classes based on the underlying mechanisms and time-course of action and release. During embryonic life, the embryonic ... [more ▼]

In Japanese quail, estrogen's effects on sexual behavior can be divided into three classes based on the underlying mechanisms and time-course of action and release. During embryonic life, the embryonic ovary secretes large amounts of estrogens. In contrast to what is observed in mammals where sexual differentiation essentially proceeds via masculinization of the males, in quail, females are demasculinized by their endogenous ovarian estrogens, an effect that can be blocked by injection of an aromatase inhibitor and mimicked in male embryos by an injection of estradiol. In adulthood, testosterone secreted by the testes is converted into estrogens by the preoptic aromatase. Locally produced estrogens activate male sexual behavior largely through the activation of estrogen receptors resulting in the transcription of a variety of genes, including brain aromatase (genomic effect). Both changes in estrogen production and action are observed within latencies ranging from a few hours to a few days, and are completely reversible. Additionally, brain aromatase activity can be modulated within minutes by calcium-dependent phosphorylations, triggered by variations in glutamatergic neurotransmission. These rapid changes in aromatase activity affect with relatively short latencies (10-15 min) the expression of male sexual behavior in quail and also in mice. Overall, the effects of estrogens on sexual behavior can thus be categorized into three classes: organizational (irreversible genomic action during ontogeny), activational (reversible genomic action during adulthood) and rapid nongenomic effects. Rapid and slower changes in brain aromatase activity match well with the two modes of estrogen action on behavior and provide temporal variations in the estrogens' bioavailability that should be able to support the entire range of established effects for this steroid. [less ▲]

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See detailEstrategias sociopreventivas del hooliganismo
Comeron, Manuel ULg

in Colome, Gabriel (Ed.) Politica y Deporte (2001)

Une analyse comparative en Europe (Angleterre, Belgique, France, Espagne): évolution des politiques sportives, le sport et l'Etat, la lutte contre le hooliganisme, les stratégies préventives, le sport ... [more ▼]

Une analyse comparative en Europe (Angleterre, Belgique, France, Espagne): évolution des politiques sportives, le sport et l'Etat, la lutte contre le hooliganisme, les stratégies préventives, le sport comme spectacle médiatique. [less ▲]

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See detailEstrogen activation revisited: control of local metabolism in the brain
Charlier, Thierry ULg

Scientific conference (2012)

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See detailEstrogen and pain: a study in aromatase knock-out mice using the formalin model.
Multon, Sylvie ULg

Conference (2004, September)

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See detailEstrogen Receptor-Beta in Quail: Cloning, Tissue Expression and Neuroanatomical Distribution
Foidart, Agnès ULg; Lakaye, Bernard ULg; Grisar, Thierry ULg et al

in Journal of Neurobiology (1999), 40(3), 327-42

A partial estrogen receptor-beta (ERbeta) cDNA had been previously cloned and sequenced in Japanese quail. The 3'- and 5'-rapid amplification of cDNA ends techniques were used here to identify a cDNA ... [more ▼]

A partial estrogen receptor-beta (ERbeta) cDNA had been previously cloned and sequenced in Japanese quail. The 3'- and 5'-rapid amplification of cDNA ends techniques were used here to identify a cDNA sequence of the quail ERbeta that contains a complete open reading frame. For the first time in an avian species, this cDNA sequence and the corresponding amino acid sequence are described. They are compared with the known ERbeta sequences previously described in mammals and with the ERalpha sequences identified in a selection of mammalian and avian species. The analysis by Northern blotting of the ERbeta mRNA expression in the brain and kidneys revealed the presence of several transcripts. The presence of ERbeta identified by reverse transcriptase-polymerase chain reaction demonstrated a widespread distribution quite different from the distribution of ERalpha. The complete neuroanatomical distribution of ERbeta mRNA as determined by in situ hybridization with 35S- and 33P-labeled oligoprobes is also presented. Transcripts are present in many nuclei implicated in the control of reproduction such as the medial preoptic nucleus, the nucleus striae terminalis, and the nucleus taeniae, the avian homologue of the amygdala. These data demonstrate the presence of ERbeta in a nonmammalian species and indicate that the (neuro)-anatomical distribution of this receptor type has been conserved in these two classes of vertebrates. The role of this receptor in the control of reproduction and other physiological processes should now be investigated. [less ▲]

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See detailEstrogen replacement therapy and inhibition of bone resorption
Reginster, Jean-Yves ULg; Sarlet, N; Albert, Adelin ULg et al

in Revue du Rhumatisme et des Maladies Osteo-Articulaires (1992), 59

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See detailEstrogen-deficient female but not male aromatase knockout (ArKO) mice exhibit "depressive-like" symptoms
Bakker, Julie ULg; Dalla, C.; Antoniou, K. et al

in Hormones & Behavior (2004, June), 46(1), 127

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See detailEstrogens and pain : a study in aromatase knock-out mice using the formalin model
Multon, Sylvie ULg; Mosen, Jeanine; Wouters, Murielle ULg et al

Poster (2004, July)

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See detailEstrogens and tumor microenvironment
Pequeux, Christel ULg

Conference (2013)

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See detailEstrogens control female sexual motivation and receptivity in quail.
de Bournonville, Catherine ULg; Ball, Gregory, F.; Balthazart, Jacques ULg et al

Poster (2013, November 10)

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