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Developmental changes in steroidogenic enzymes in human postnatal adrenal cortex: immunohistochemical studies
T Suzuki1, H Sasano, J Takeyama
1Department of Pathology, Tohoku University School of Medicine, Sendai, Japan. t-suzuki@patholo2.med.tohoku.ac.jp
Clinical Endocrinology
|January 13, 2001
Summary
The human adrenal zona reticularis develops around age 5, with enzyme changes supporting C19 steroid production for adrenarche. This study examines steroidogenic enzyme development in postnatal adrenal glands.
Area of Science:
- Endocrinology
- Developmental Biology
- Molecular Biology
Background:
- Adrenarche, linked to C19 steroid production, is thought to involve intra-adrenal changes in steroidogenic enzymes.
- Developmental changes in these enzymes within the human postnatal adrenal gland are not well understood.
Purpose of the Study:
- To investigate developmental changes in key steroidogenic enzymes within the human adrenal gland from infancy to adulthood.
- To correlate these enzymatic changes with the functional maturation of the adrenal cortex, particularly the zona reticularis.
Main Methods:
- Immunohistochemistry was performed on 24 human adrenal specimens (7 months to 62 years).
- Enzyme expression (P450scc, P450c17, DHEA-ST, P450 oxidoreductase, cytochrome b5, 3betaHSD) was quantified using computed image analysis.
- Localization and intensity of immunoreactivity were assessed across adrenal cortical zones.
Main Results:
- P450scc immunoreactivity was consistently high across all zones.
- P450c17 and DHEA-ST expression increased in the zona reticularis after age 5.
- P450 oxidoreductase and cytochrome b5 also showed increased expression in the zona reticularis post-5 years, while 3betaHSD decreased.
Conclusions:
- The human adrenal zona reticularis undergoes significant morphological and functional development around age 5.
- Increased expression of P450c17, DHEA-ST, P450 oxidoreductase, and cytochrome b5, coupled with decreased 3betaHSD, likely drives increased C19 steroid production during adrenarche.