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Published on: December 23, 2010
TLR4 Signaling in MPP⁺-Induced Activation of BV-2 Cells
Peng Zhou1, Ruihui Weng2, Zhaoyu Chen2
1Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, 600 Tianhe Road, Guangzhou, Guangdong 510630, China; Department of Neurology, The Second Affiliated Hospital of Guangzhou Medical University, 250 Changgang Dong Road, Guangzhou 510260, China.
Aims:
This work was conducted to establish an in vitro Parkinson's disease (PD) model by exposing BV-2 cells to 1-methyl-4-phenylpyridinium (MPP(+)) and exploring the roles of TLR2/TLR4/TLR9 in inflammatory responses to MPP(+).
Methods/Results:
MTT assay showed that cell viability of BV-2 cells was 84.78 ± 0.86% and 81.18 ± 0.99% of the control after incubation with 0.1 mM MPP(+) for 12 hours and 24 hours, respectively. Viability was not significantly different from the control group. With immunofluorescence technique, we found that MPP(+) incubation at 0.1 mM for 12 hours was the best condition to activate BV-2 cells. In this condition, the levels of TNF-α, IL-1β, and iNOS protein were statistically increased compared to the control according to ELISA tests. Real time RT-PCR and western blot measurements showed that TLR4 was statistically increased after 0.1 mM MPP(+) incubation for 12 hours. Furthermore, after siRNA interference of TLR4 mRNA, NF-κB activation and the levels of TNF-α, IL-1β, and iNOS were all statistically decreased in this cell model.
Conclusion:
MPP(+) incubation at the concentration of 0.1 mM for 12 hours is the best condition to activate BV-2 cells for mimicking PD inflammation in BV-2 cells. TLR4 signalling plays a critical role in the activation of BV-2 cells and the induction of inflammation in this cell model.
Insights
This study establishes an in vitro Parkinson's disease (PD) model using 1-methyl-4-phenylpyridinium (MPP(+)) in BV-2 cells. Toll-like receptor 4 (TLR4) signaling is crucial for MPP(+)-induced inflammation in this PD model.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Parkinson's disease (PD) is a neurodegenerative disorder characterized by neuroinflammation.
- Establishing reliable in vitro models is crucial for studying PD pathogenesis.
- Microglial activation and inflammatory responses are key features of PD.
Purpose of the Study:
- To develop an in vitro Parkinson's disease (PD) model using BV-2 cells and 1-methyl-4-phenylpyridinium (MPP(+)).
- To investigate the role of Toll-like receptors (TLRs), specifically TLR2, TLR4, and TLR9, in mediating inflammatory responses to MPP(+).
Main Methods:
- BV-2 cells were exposed to varying concentrations and durations of MPP(+).
- Cell viability was assessed using MTT assays.
- Immunofluorescence, ELISA, real-time RT-PCR, and Western blot were used to measure inflammatory markers and TLR expression.
- siRNA interference was employed to silence TLR4 mRNA.
Main Results:
- MPP(+) at 0.1 mM for 12 hours effectively activated BV-2 cells without significant cytotoxicity.
- This condition led to increased levels of TNF-α, IL-1β, and iNOS.
- MPP(+) exposure upregulated TLR4 expression.
- Silencing TLR4 significantly reduced NF-κB activation and inflammatory cytokine production.
Conclusions:
- The optimal condition for mimicking PD-related inflammation in BV-2 cells is 0.1 mM MPP(+) for 12 hours.
- TLR4 signaling is a critical mediator of BV-2 cell activation and inflammation in this in vitro PD model.
