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Androgen metabolism in the brain.
1Istituto di Endocrinologia, Università degli Studi di Milano, Italy.
The Journal of Steroid Biochemistry and Molecular Biology
|November 1, 1991
Summary
This study reveals that the enzyme 5 alpha-reductase is concentrated in brain white matter and myelin. Neurons, not glial cells, metabolize androgens into estrogens, suggesting a role in myelin development.
Area of Science:
- Neuroscience
- Endocrinology
- Cell Biology
Background:
- Androgen metabolism in the brain is not fully understood.
- The specific localization and function of key enzymes involved in steroid metabolism within neural tissues require further elucidation.
Purpose of the Study:
- To summarize current knowledge on androgen metabolism in the brain.
- To investigate the distribution and activity of 5 alpha-reductase and aromatase in different neural cell types.
- To explore the potential role of steroid metabolism in myelinogenesis.
Main Methods:
- Review of recent literature on androgen metabolism in neural tissues.
- Analysis of enzyme distribution (5 alpha-reductase, aromatase) in brain white matter, myelin, neurons, and glial cells.
- In vitro studies on isolated or cultured neurons and glial cells (astrocytes, oligodendrocytes).
Main Results:
- The enzyme 5 alpha-reductase shows high concentration in brain white matter and myelin.
- Neurons exhibit higher concentrations of 5 alpha-reductase compared to glial cells.
- Only neurons possess the enzymatic capability to convert androgens into estrogens via aromatase.
Conclusions:
- Androgen metabolism is localized within specific cellular compartments in the brain, particularly in neurons.
- The presence of 5 alpha-reductase in myelin suggests a direct role in myelin maintenance or formation.
- Neuronal aromatization of androgens to estrogens may play a significant role in regulating myelinogenesis.