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Updated: Jun 23, 2025
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Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
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Effects of hypernatremia on the microglia
Sachiho Fuse1, Haruki Fujisawa1, Naoya Murao1
1Department of Endocrinology, Diabetes and Metabolism, School of Medicine, Fujita Health University, Toyoake, Aichi 470-1192, Japan.
Peptides
|June 22, 2024
Summary
High sodium levels activate microglia, increasing nitric oxide production via NFAT5 and calcium signaling. Minocycline mitigates these effects, suggesting a therapeutic target for hypernatremia-related neurological issues.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Hypernatremia, characterized by high sodium levels, often causes central nervous system dysfunction.
- Microglia are implicated in neurological damage, particularly in conditions like osmotic demyelination syndrome (ODS).
- Minocycline has shown protective effects against ODS by modulating microglial activation.
Purpose of the Study:
- To investigate the impact of acute and chronic high sodium concentrations on microglial cells.
- To elucidate the molecular mechanisms underlying microglial responses to hypernatremia.
- To assess the potential of minocycline in modulating these responses.
Main Methods:
- Utilized the BV-2 microglial cell line to study effects of acute (6-24h) and chronic (≥7 days) high sodium exposure.
- Measured nitric oxide (NO) production and NOS2 expression.
- Investigated the role of nuclear factor of activated T-cells-5 (NFAT5), intracellular calcium (Ca2+), and the Na+/Ca2+ exchanger (NCX).
Main Results:
- Both acute and chronic high sodium increased NOS2 expression and NO production in microglia.
- High sodium elevated NFAT5 expression, and NFAT5 knockdown reduced NOS2 and NO.
- High sodium decreased intracellular Ca2+; NCX inhibition and minocycline suppressed these changes and NO production.
Conclusions:
- Microglial activation in response to high sodium is mediated by NFAT5 and Ca2+ efflux via NCX.
- Minocycline inhibits microglial activation induced by high sodium concentrations.
- These findings offer insights into potential therapeutic strategies for hypernatremia-induced neurological complications.
