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Neuroactive steroids and peripheral myelin proteins
V Magnaghi1, I Cavarretta, M Galbiati
1Department of Endocrinology and Center of Excellence for Neurodegenerative Disorders, University of Milan, Via Balzaretti 9, 20133, Milan, Italy. magnaghi@mailserver.unimi.it
Brain Research. Brain Research Reviews
|December 18, 2001
Summary
Neuroactive steroids stimulate myelin protein gene expression in the peripheral nervous system. This suggests potential therapeutic uses for demyelinating diseases and nerve injuries.
Area of Science:
- Neuroscience
- Endocrinology
- Molecular Biology
Background:
- Neuroactive steroids, including progesterone and testosterone, play roles in the nervous system.
- Myelin proteins like glycoprotein Po (Po) and peripheral myelin protein 22 (PMP22) are crucial for peripheral nerve function.
- Dysregulation of myelin protein synthesis is implicated in demyelinating diseases and aging.
Purpose of the Study:
- To investigate the role of neuroactive steroids in regulating the gene expression of myelin proteins Po and PMP22 in the peripheral nervous system.
- To identify the specific steroid and non-steroid receptors involved in these regulatory pathways.
Main Methods:
- In vivo studies using aged and adult male rats.
- In vitro studies using Schwann cell cultures.
- Analysis of mRNA levels for Po and PMP22.
- Detection of progesterone receptor (PR), androgen receptor (AR), and GABA(A) receptors in sciatic nerve and Schwann cells.
Main Results:
- Neuroactive steroids significantly stimulated mRNA levels of Po and PMP22.
- PR mediated the stimulatory effect of neuroactive steroids on Po.
- GABA(A) receptor was involved in the PMP22 response to neuroactive steroids.
- Presence of PR, AR, and GABA(A) receptors confirmed in sciatic nerve and Schwann cells.
Conclusions:
- Neuroactive steroids are key regulators of myelin protein gene expression in the peripheral nervous system.
- Specific receptor pathways (PR for Po, GABA(A) for PMP22) are involved.
- Targeting these pathways with specific receptor ligands may offer novel therapeutic strategies for myelin repair in demyelinating conditions and nerve injury.