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Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
Brain microglia express steroid-converting enzymes in the mouse.
Andres Gottfried-Blackmore1, Amanda Sierra, Peter H Jellinck
1Laboratory of Neuroendocrinology, Rockefeller University, 1230 York Avenue, New York, NY 10065, United States.
The Journal of Steroid Biochemistry and Molecular Biology
|March 11, 2008
Summary
Microglia, key immune cells in the brain, can metabolize steroid hormones using specific enzymes. This suggests a novel role for microglia in regulating brain inflammation and neurodegeneration.
Area of Science:
- Neuroscience
- Immunology
- Endocrinology
Background:
- Steroid hormones are crucial for central nervous system (CNS) homeostasis and injury response.
- Activated microglia are central players in neurodegenerative processes.
Purpose of the Study:
- To investigate if microglia are a source for active steroid hormone metabolism.
- To explore the role of microglia in steroid hormone conversion within the brain.
Main Methods:
- RT-PCR was used to detect mRNA expression of steroid-metabolizing enzymes in mouse microglia.
- Primary microglia cultures were incubated with steroid precursors (DHEA and AD) to assess metabolic activity.
- Neuronal cells were used to test the estrogen receptor agonist activity of produced metabolites.
Main Results:
- Mouse microglia express mRNA for 17beta-hydroxysteroid dehydrogenase type 1 and steroid 5alpha-reductase type 1, involved in androgen and estrogen metabolism.
- Microglia produced delta-5 androgens (Adiol) from DHEA and 5alpha-reduced androgens from AD.
- Adiol demonstrated estrogen receptor agonist activity in neuronal cells, and peripheral benzodiazepine receptor (PBR) ligands reduced TNFalpha production.
Conclusions:
- Microglia possess the enzymatic machinery to metabolize steroid hormones, influencing the brain microenvironment.
- Microglia's steroid metabolism may play a role in modulating neuroinflammation and neurodegeneration.
- Peripheral benzodiazepine receptor ligands on microglia exhibit immunomodulatory effects, potentially impacting neuroinflammation.
