Reference : Neuroanatomical Specificity in the Co-Localization of Aromatase and Estrogen Receptors
Scientific journals : Article
Human health sciences : Endocrinology, metabolism & nutrition
Life sciences : Zoology
Social & behavioral sciences, psychology : Neurosciences & behavior
Neuroanatomical Specificity in the Co-Localization of Aromatase and Estrogen Receptors
Balthazart, Jacques mailto [Université de Liège - ULg > Département des sciences biomédicales et précliniques > Biologie de la différenciation sexuelle du cerveau >]
Foidart, Agnès mailto [Université de Liège - ULg > Services généraux (Faculté de médecine) > Service administratif de la Faculté (Médecine) >]
Surlemont, C. [> > > >]
Harada, N. [> > > >]
Journal of Neurobiology
Yes (verified by ORBi)
[en] The relative distributions of aromatase and of estrogen receptors were studied in the brain of the Japanese quail by a double-label immunocytochemical technique. Aromatase immunoreactive cells (ARO-ir) were found in the medial preoptic nucleus, in the septal region, and in a large cell cluster extending from the dorso-lateral aspect of the ventromedial nucleus of the hypothalamus to the tuber at the level of the nucleus inferioris hypothalami. Immunoreactive estrogen receptors (ER) were also found in each of these brain areas but their distribution was much broader and included larger parts of the preoptic, septal, and tuberal regions. In the ventromedial and tuberal hypothalamus, the majority of the ARO-ir cells (over 75%) also contained immunoreactive ER. By contrast, very few of the ARO-ir cells were double-labeled in the preoptic area and in the septum. More than 80% of the aromatase-containing cells contained no ER in these regions. This suggests that the estrogens, which are formed centrally by aromatization of testosterone, might not exert their biological effects through binding with the classical nuclear ER. The fact that significant amounts of aromatase activity are found in synaptosomes purified by differential centrifugation and that aromatase immunoreactivity is observed at the electron microscope level in synaptic boutons suggests that aromatase might produce estrogens that act at the synaptic level as neurohormones or neuromodulators.

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