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Immunocytochemical localization of aromatase-containing neurons in the rat brain during pre- and postnatal development

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Abstract

the present immunohistochemical study demonstrates the ontogenetic appearance of aromatase-immunoreactive neurons in several discrete regions of the hypothalamus and limbic system in the rat brain, using a purified antibody against human placental aromatase cytochrome P450. Immunoreactive cells were first detected in the preoptic area on the 13th day of embryonic life (E 13), and additionally in the bed nucleus of the stria terminalis on E 15. Labeled cells were also found in the medial amygdaloid nucleus and the ventromedial nucleus on E 16, and some were detected in the arcuate nucleus on E 19. As gestation progressed, the number and the immunoreactivity of these cells gradually increased and peaked within definite periods of perinatal life and there-after declined or disappeared. The immunoreactive cells were also found in the central amygdaloid nucleus and the lateral septal nucleus, and in the ventral pallidum, after the 14th day of postnatal life (P 14) and 30th day (P 30), respectively. The distribution of aromatase-immunoreactive neurons was similar between the sexes, while the immunoreactivity was higher in males than in females after late gestational days. No immunoreaction was detectable in other regions of the telencephalon or midbrain at any time periods studied. The aromatase-immunoreactive neurons in the specific regions may be involved in the sexual differentiation of the brain.

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Authors and Affiliations

  1. Department of Anatomy, School of Medicine, The University of Tokushima, 770, Tokushima, Japan

    Yoshihiro Tsuruo & Kazunori Ishimura

  2. Shionogi Research Laboratories, 12-4 Sagisu 5-chome, Fukushima-ku, 553, Osaka, Japan

    Hisao Fujita

  3. Endocrine Biochemistry Department, Medical Foundation of Buffalo, 14203, Buffalo, NY, USA

    Yoshio Osawa

Authors
  1. Yoshihiro Tsuruo
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  2. Kazunori Ishimura
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  3. Hisao Fujita
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  4. Yoshio Osawa
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Tsuruo, Y., Ishimura, K., Fujita, H. et al. Immunocytochemical localization of aromatase-containing neurons in the rat brain during pre- and postnatal development. Cell Tissue Res 278, 29–39 (1994). https://doi.org/10.1007/BF00305775

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  • DOI: https://doi.org/10.1007/BF00305775

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