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Propofol Attenuates Inflammatory Response in LPS-Activated Microglia by Regulating the miR-155/SOCS1 Pathway
Xinxun Zheng1, Hongbing Huang2, Jianjun Liu3
1Department of Anesthesiology, Peking University Shenzhen Hospital, Shenzhen, China.
Abstract:
Propofol is a widely used intravenous anesthetic agent with potential neuroprotective effect in diverse models of neuronal injury, including ischemic stroke and traumatic brain injury. However, few studies have been carried out to determine the effects and molecular mechanisms of propofol in classic microglial activation (M1 activation) related to neuronal injury. This study explored the anti-inflammatory effects of propofol in LPS-activated BV2 microglia. Propofol potently decreased the pro-inflammatory mediators, such as nitric oxide, TNF-α, and IL-6, at both the transcriptional and translational levels. Furthermore, propofol suppressed the expression of miR-155 in LPS-activated cells. Knockdown of miR-155 attenuated the anti-inflammatory effect of propofol in cells after LPS exposure. miR-155 was also confirmed as a negative regulator of SOCS1 expression. The inhibitory effect of propofol on LPS-induced inflammation involved the upregulation of SOCS1. Overall, these results suggest that propofol can suppress the neuroinflammatory response of microglia to LPS through the regulation of the miR-155/SOCS1 pathway.
Insights
Propofol, an anesthetic, reduces inflammation in microglia by inhibiting miR-155 and upregulating SOCS1. This neuroprotective pathway is key for managing neuronal injury.
Area of Science:
- Neuroscience
- Pharmacology
- Immunology
Background:
- Propofol is a common anesthetic with known neuroprotective properties.
- Microglial activation (M1) is crucial in neuronal injury, but propofol's role is understudied.
- Understanding propofol's anti-inflammatory mechanisms in microglia is vital.
Purpose of the Study:
- To investigate the anti-inflammatory effects of propofol on lipopolysaccharide (LPS)-activated BV2 microglia.
- To elucidate the molecular mechanisms underlying propofol's action, focusing on the miR-155/SOCS1 pathway.
Main Methods:
- BV2 microglia were activated with LPS to mimic inflammatory conditions.
- Propofol's effects on pro-inflammatory mediators (nitric oxide, TNF-α, IL-6) were assessed.
- Expression levels of miR-155 and SOCS1 were analyzed using molecular techniques.
- miR-155 knockdown was performed to confirm its role.
Main Results:
- Propofol significantly reduced pro-inflammatory mediators (nitric oxide, TNF-α, IL-6) at both transcriptional and translational levels.
- Propofol suppressed miR-155 expression in LPS-activated microglia.
- Knockdown of miR-155 diminished propofol's anti-inflammatory effects.
- Propofol increased SOCS1 expression, which was negatively regulated by miR-155.
Conclusions:
- Propofol exhibits potent anti-inflammatory effects in LPS-activated microglia.
- The mechanism involves the downregulation of miR-155 and subsequent upregulation of SOCS1.
- Propofol's regulation of the miR-155/SOCS1 pathway suppresses neuroinflammation, offering therapeutic potential for neuronal injury.
