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Updated: Jul 10, 2026
Characterization and Isolation of Mouse Primary Microglia by Density Gradient Centrifugation
Published on: February 16, 2018
Functional deficits in immortalized microglial cell lines limit their utility for modeling neuroinflammation
Xiaoyan Xiong1, Qilong Wu1, Xuecheng Qiu2
1Department of Histology and Embryology, Neurobiology Research Center, Zhongshan School of Medicine, Sun Yat-Sen University Shenzhen Campus, Shenzhen, Guangdong, China.
Background:
Microglia, the resident immune cells of the central nervous system (CNS), play a pivotal role in brain development and disease. Although primary microglia serve as the gold standard for in vitro investigations, their limited proliferative capacity has driven the widespread use of immortalized cell lines, with the BV-2 cell line being the most prominent. However, accumulating evidence demonstrates that BV-2 cells exhibit profound functional discrepancies relative to primary microglia.
Aim:
This study aimed to generate optimized lentivirus-mediated human telomerase reverse transcriptase (hTERT)-immortalized microglial cell lines, and to compare their functional similarity to primary microglia and the BV-2 cells.
Method:
We established two murine microglial cell lines (CM-A1, CM-A3) via lentiviral hTERT transduction. Cellular characteristics including CD11b expression, cell morphology, phagocytic capacity, and transcriptional responses of inflammatory genes to lipopolysaccharide (LPS) were comprehensively evaluated.
Results:
CM-A1 and CM-A3 exhibited higher surface CD11b expression and basal phagocytic capacity relative to BV-2 cells. Nevertheless, all immortalized cell lines presented prominent functional defects, including reduced surface CD11b abundance, impaired morphological transformation following LPS stimulation, loss of LPS-triggered phagocytic upregulation, and suppressed induction of pro-inflammatory genes.
Conclusions:
These findings reveal that both hTERT-immortalized microglial lines and BV-2 cells fail to recapitulate the critical dynamic functional responses observed in primary microglia, highlighting the importance of rigorous model selection in neuroimmunological research.
Insights
New immortalized microglial cell lines (CM-A1, CM-A3) show improved function over BV2 cells but still fail to fully replicate primary microglia responses. Careful model selection is crucial for neuroimmunology research.
Area of Science:
- Neuroimmunology
- Cell Biology
- Central Nervous System (CNS) Research
Background:
- Microglia are key immune cells in the CNS, vital for development and disease.
- Primary microglia are ideal but have limited proliferation, leading to the use of immortalized cell lines like BV2.
- Existing immortalized lines, including BV2, show significant functional differences from primary microglia.
Purpose of the Study:
- To create improved immortalized murine microglial cell lines using lentivirus-mediated human telomerase reverse transcriptase (hTERT) transduction.
- To assess the functional similarity of these new cell lines (CM-A1, CM-A3) to primary microglia, comparing them against the BV2 cell line.
Main Methods:
- Established two murine microglial cell lines (CM-A1, CM-A3) through lentiviral hTERT gene delivery.
- Evaluated cell characteristics: CD11b expression, morphology, phagocytosis, and inflammatory gene response to lipopolysaccharide (LPS).
Main Results:
- CM-A1 and CM-A3 displayed higher CD11b expression and basal phagocytosis than BV2 cells.
- All immortalized lines showed functional deficits: reduced CD11b, impaired LPS-induced morphological changes, and blunted inflammatory gene responses.
- LPS-triggered phagocytic upregulation was lost in immortalized lines.
Conclusions:
- hTERT-immortalized microglial lines and BV2 cells do not fully replicate dynamic functional responses of primary microglia.
- These findings underscore the need for careful consideration when selecting microglial models for neuroimmunological studies.
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