Doublecortin as a Marker of Adult Neuroplasticity in the Canary Song Control Nucleus Hvc (2008)
Balthazart, Jacques, Boseret, Géraldine, Konkle, A T, Hurley, LL, Ball, G F
It is established that in songbirds the size of several brain song control nuclei varies seasonally, based on changes in cell size, dendritic branching and, in nucleus HVC, the incorporation of...
Balthazart, Jacques, Voigt, C, Boseret, Géraldine, Ball, G F
Songbirds produce learned vocalizations that are controlled by a specialized network of neural structures, the song control system. Several nuclei in this song control system demonstrate a marked...
Charlier, Thierry, Ball, G F, Balthazart, Jacques
Analysis of nuclear receptor action on the eukaryotic genome highlights the importance of coactivators on gene transcription. The steroid receptor coactivator-1 in particular is the focus of an...
Rapid changes in production and behavioral action of estrogens. (2006)
Balthazart, Jacques, Cornil, Charlotte, Taziaux, M, Charlier, Thierry, Baillien, M, Ball, G F
It is well established that sex steroid hormones bind to nuclear receptors, which then act as transcription factors to control brain sexual differentiation and the activation of sexual behaviors....
Effects of calmodulin on aromatase activity in the preoptic area. (2005)
Balthazart, Jacques, Baillien, M, Charlier, Thierry, Ball, G F
Oestrogens derived from the neural aromatisation of testosterone play a key role in the activation of male sexual behaviour in many vertebrates. Besides their slow action on gene transcription...
Charlier, Thierry, Ball, G F, Balthazart, Jacques
We analyzed the expression of the immediate early genes c-fos and Zenk (egr-1) in the brain of male quail that were gonadally intact (I) or castrated and treated (CX+T) or not (CX) with testosterone...
Calcium-dependent phosphorylation processes control brain aromatase in quail. (2003)
Balthazart, Jacques, Baillien, M, Charlier, Thierry, Ball, G F
Increased gene transcription activated by the binding of sex steroids to their cognate receptors is one important way in which oestrogen synthase (aromatase) activity is regulated in the brain. This...
Appeltants, D, Ball, G F, Balthazart, Jacques
Singing and the processing of auditory information related to song can be affected by experimental manipulations of catecholamine activity in the brain of zebra finches. We investigated, by...
Rapid and Reversible Inhibition of Brain Aromatase Activity (2001)
Balthazart, Jacques, Baillien, M, Ball, G F
Many actions of androgens require their conversion via the enzyme aromatase into oestrogens. Changes in brain aromatase activity are thought to take place via changes in enzyme concentration mediated...
Tlemcani, O, Ball, G F, D'Hondt, E, Vandesande, F, Sharp, P J, Balthazart, Jacques
We investigated the expression of Fos, the protein product of the immediate early gene c-fos in the brain of male Japanese quail after they engaged in either appetitive or consummatory sexual...
Tlemçani, O ; JFA; CORA, Ball, G F, D'Hondt, E, Vandesande, Frans; U0008976 ;, Sharp, P J, Balthazart, J
We investigated the expression of Fos, the protein product of the immediate early gene c-fos in the brain of male Japanese quail after they engaged in either appetitive or consummatory sexual...
Appeltants, D, Absil, Philippe, Balthazart, Jacques, Ball, G F
The telencephalic nucleus HVc (sometimes referred to as the high vocal center) plays a key role in the production and perception of birdsong. Although many afferent and efferent connections to this...
D'Hondt, E ; JFA; CORA, Vermeiren, Jan; U0003953 ;, Peeters, K, Balthazart, J, Tlemçani, O, Ball, G F, ...
In the past 10 years, the study of the expression of immediate early genes, such as c-fos, in the brain has become a common method for the identification of brain areas involved in the regulation of...
Estrogen Receptor-Beta in Quail: Cloning, Tissue Expression and Neuroanatomical Distribution (1999)
Foidart, Agnès, Lakaye, Bernard, Grisar, Thierry, Ball, G F, Balthazart, Jacques
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...
Balthazart, Jacques, Foidart, Agnès, Houbart, M, Prins, G S, Ball, G F
The distribution of androgen receptor-like immunoreactive (AR-ir) cells in the quail brain was analyzed by immunocytochemistry with the use of the affinity-purified antibody PG-21-19A raised against...
New Insights into the Regulation and Function of Brain Estrogen Synthase (Aromatase) (1998)
Balthazart, Jacques, Ball, G F
In the brain, conversion of androgens into estrogens by the enzyme aromatase (estrogen synthase) is a key mechanism by which testosterone regulates many physiological and behavioral processes,...
Balthazart, Jacques, Foidart, Agnès, Baillien, M, Harada, N, Ball, G F
The activation of male sexual behavior in Japanese quail (Coturnix japonica) requires the transformation of testosterone to 17beta-estradiol by the enzyme aromatase (estrogen synthetase). There are...
Castagna, C, Ball, G F, Balthazart, Jacques
The effects of pharmacological manipulations of dopaminergic transmission on appetitive and consummatory aspects of male sexual behavior were investigated in castrated male Japanese quail treated...
Balthazart, Jacques, Castagna, C, Ball, G F
Pharmacological studies in Japanese quail based on behavioral tests with a variety of dopaminergic compounds suggest that the activation of D2 dopamine receptors inhibits, and the activation of D1...
Balthazart, Jacques, Castagna, C, Ball, G F
Two experiments investigated the role of estrogens in the activation and sexual differentiation of appetitive sexual behavior (ASB) in Japanese quail (Coturnix japonica) as measured by a learned...
Balthazart, Jacques, Tlemcani, O, Ball, G F
Early workers interested in the mechanisms mediating sex differences in morphology and behavior assumed that differences in behavior that are commonly observed between males and females result from...
Balthazart, Jacques, Absil, Philippe, Foidart, Agnès, Houbart, M, Harada, N, Ball, G F
Cells immunoreactive for the enzyme aromatase were localized in the forebrain of male zebra finches with the use of an immunocytochemistry procedure. Two polyclonal antibodies, one directed against...
Balthazart, Jacques, Reid, J, Absil, Philippe, Foidart, Agnès, Ball, G F
Appetitive male sexual behavior was measured in male quail with the use of a learned social proximity procedure that quantified the time spent by a male in front of a window providing a view of a...
Immunocytochemical Localization of Androgen Receptors in the Male Songbird and Quail Brain (1992)
Balthazart, Jacques, Foidart, Agnès, Wilson, E M, Ball, G F
The distribution of androgen receptors was studied in the brain of the Japanese quail (Coturnix japonica), the zebra finch (Taeniopygia guttata), and the canary (Serinus canaria) by...
Balthazart, Jacques, Ball, G F, McEwen, B S
The neuroanatomical distribution of alpha 1-adrenergic receptors was studied in Japanese quail by quantitative in vitro autoradiography using the specific antagonist [3H]prazosin as the ligand. The...
Balthazart, Jacques, Ball, G F
Previous investigations have established that DSP-4 reliably enhances the activating effects of testosterone on copulatory behavior in adult male quail. In the present study, we wanted to clarify the...
Ball, G F, Foidart, Agnès, Balthazart, Jacques
The nucleus intercollicularis is an important site in the control of vocalization in birds. In oscines, a subregion of the nucleus intercollicularis called the dorso-medial intercollicular nucleus...
Melatonin, immunity and cost of reproductive state in male European starlings.
Bentley, G E, Demas, G E, Nelson, R J, Ball, G F
The effects of reproductive condition and exogenous melatonin on immune function were investigated in castrated European starlings, Sturnus vulgaris. Photorefractory and photostimulated starlings...