Immunolocalization of aromatase- and androgen receptor-positive neurons in the goldfish brain

General and Comparative Endocrinology
D Gelinas, G V Callard

Abstract

Full expression of testosterone (T) actions in the brain requires both direct binding to androgen receptors (AR) and in situ aromatization to estradiol (E2). To determine the cellular basis of constitutively high aromatase and AR binding activities in teleost fish brain, and the neuroanatomic location and spatial relations of cells of each type, an immunocytochemical mapping study of goldfish (Carassius auratus) brain was carried out using antibodies to human placental aromatase and human/rat AR peptide and the avidin-biotin-peroxidase technique. Both antibodies specifically labeled cells that were neuronal in appearance and were most numerous in reproductive control centers: medial and ventral telencephalon (TEL) and preoptic and hypothalamic periventricular nuclei. Additional populations of aromatase- and AR-labeled cells were present in the olfactory bulbs, central telencephalon, and stratum periventriculare of the optic tectum. Anti-aromatase, but not anti-AR, labeled fiber tracts and fibrous layers in visual and auditory pathways, and perikarya and processes of premotor neurons known to integrate sensory input (reticulospinal neurons, Mauthner cells). Anti-AR selectively labeled lateral TEL regions, the nucleus ventromedia...Continue Reading

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