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Published on: January 30, 2014
Ultrasound modulates microglial activity and reduces neuroinflammation in a parameter-dependent manner
Sarina Grewal1,2,3, Francesco Iacoponi4,5, Lok Yin Nicholas Chan1
1Department of Bioengineering, Imperial College London, London, UK.
Abstract:
Neuroinflammation contributes to the progression of many neurological diseases. Here, we explore whether ultrasound can reduce microglia-mediated inflammation in vitro and in vivo. We tested a broad range of ultrasound parameters in a BV2 microglial cell line, treated with lipopolysaccharide (LPS) to induce an inflammatory response. We found that specific combinations of centre frequency, acoustic pressure and treatment duration can significantly lower the levels of pro-inflammatory cytokines, including tumor necrosis factor (TNF)-α, interleukin (IL)-1β and IL-6. These effects lasted up to 72 h and were associated with the downregulation of the nuclear factor κB (NF-κB), suggesting a mechanistic link between ultrasound and inflammation. Further investigation in vivo, in LPS-treated mice, revealed a reduction in TNF-α expression in the hippocampus following ultrasound. Overall, our findings showcase the potential of ultrasound as a non-invasive therapeutic strategy to reduce neuroinflammation and restore brain homeostasis.
Insights
Ultrasound therapy can significantly reduce neuroinflammation by lowering pro-inflammatory cytokines like TNF-α, IL-1β, and IL-6. This non-invasive approach shows promise for treating neurological diseases by restoring brain homeostasis.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Immunology
Background:
- Neuroinflammation is a key factor in neurological disease progression.
- Microglia play a central role in neuroinflammation.
- Current treatments for neuroinflammation often have limitations.
Purpose of the Study:
- To investigate the potential of ultrasound to reduce microglia-mediated inflammation.
- To identify optimal ultrasound parameters for anti-inflammatory effects.
- To explore the therapeutic application of ultrasound in neurological conditions.
Main Methods:
- Utilized BV2 microglial cell line stimulated with lipopolysaccharide (LPS).
- Tested various ultrasound parameters (frequency, pressure, duration).
- Assessed pro-inflammatory cytokine levels (TNF-α, IL-1β, IL-6) and NF-κB pathway.
- Validated findings in LPS-treated mice, examining hippocampal TNF-α expression.
Main Results:
- Specific ultrasound parameters significantly reduced pro-inflammatory cytokines in vitro.
- Anti-inflammatory effects persisted for up to 72 hours.
- Ultrasound treatment downregulated the NF-κB pathway.
- In vivo studies showed reduced TNF-α expression in the hippocampus of treated mice.
Conclusions:
- Ultrasound demonstrates potential as a non-invasive therapeutic strategy for neuroinflammation.
- The findings suggest a mechanistic link between ultrasound and the NF-κB pathway.
- Ultrasound may help restore brain homeostasis in neurological diseases.
