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Updated: Mar 22, 2026
Primary Microglia Isolation from Mixed Glial Cell Cultures of Neonatal Rat Brain Tissue
Published on: August 15, 2012
[Dexamethason suppresses the activation of rat microglia induced by glutamic acid]
Lu Li1, Jinping Shao2, Xiuhua Ren2
1Department of Anesthesiology, First Affiliated Hospital, Zhengzhou University, Zhengzhou 450052, China.
Objective:
To investigate the effect of dexamethasone (DEX) on the microglia activation induced by glutamic acid (GLU) in rats.
Methods:
We isolated and cultured the microglia from the spinal cord of SD infant rats in vitro. The cell purity was tested by immunofluorescence technique. The cells were then randomly divided into 5 groups: Dulbecco' s phosphate buffered saline treatment (DPBS group); GLU treatment (GLU group); DEX pretreatment and then GLU stimulation; simultaneous treatment of DEX and GLU; GLU stimulation followed by DEX treatment. Finally, immunofluorescence technique was used to investigate the expressions of glucocorticoid receptor (GR) and CD11b/c protein.
Results:
Compared with the DPBS group, GLU group presented the increased expression of CD11b/c protein, the shorten length of cell processes as well as cell shape turning round. Furthermore, compared with the GLU group, the CD11b/c protein expression significantly decreased in the group treated simultaneously with DEX and GLU and the group treated with DEX after GLU stimulation. However, the expression was not different between the GLU group and the group treated with DEX and then stimulated by GLU.
Conclusion:
DEX could inhibit microglia activation induced by GLU, while DEX pretreatment have no such an effect on microglia.
Insights
Dexamethasone (DEX) inhibits microglia activation induced by glutamic acid (GLU). However, DEX pretreatment before GLU stimulation did not show this inhibitory effect on microglia activation.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Microglia play a crucial role in neuroinflammation.
- Glutamic acid (GLU) is known to induce microglia activation.
- Dexamethasone (DEX) is a potent anti-inflammatory corticosteroid.
Purpose of the Study:
- To investigate the effect of dexamethasone (DEX) on microglia activation induced by glutamic acid (GLU) in an in vitro rat model.
- To determine the optimal timing for DEX administration to inhibit GLU-induced microglia activation.
Main Methods:
- Primary microglia cultures were established from rat spinal cords.
- Cells were stimulated with GLU and treated with DEX at different time points (pretreatment, simultaneous, or post-treatment).
- Immunofluorescence was used to assess microglia activation markers (CD11b/c) and glucocorticoid receptor (GR) expression.
Main Results:
- GLU significantly increased microglia activation, characterized by elevated CD11b/c expression and morphological changes.
- Simultaneous DEX and GLU treatment, and post-GLU DEX treatment, significantly reduced CD11b/c expression compared to GLU alone.
- Pretreatment with DEX prior to GLU stimulation did not significantly alter the level of microglia activation.
Conclusions:
- Dexamethasone effectively inhibits glutamic acid-induced microglia activation when administered concurrently or after GLU exposure.
- DEX pretreatment is not effective in preventing GLU-induced microglia activation.
- These findings highlight the importance of treatment timing for DEX efficacy in modulating neuroinflammation.
