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Published on: February 21, 2011
MK2 inhibitor PF-3644022 shows protective effect in mouse microglial N9 cell line induced with cigarette smoke
Shikha Asthana1, Shivam Kumar Pandey1, Avtar Singh Gautam1
1Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research, Raebareli, Transit campus, Lucknow, Uttar Pradesh, India.
Abstract:
Neuroinflammation is suggested as one of the potential links between CS-induced neuronal dysfunction. Cigarette smoke (CS) is one of the significant contributors of neuroinflammation, consequently leading to cognitive impairment and neurodegeneration. Microglia are the key resident macrophage cells in the brain with cell surface TLR4 receptor for responding to various stress signals. The CS constituents promote inflammation and oxidative stress in microglia leading to cytotoxicity through the TLR4-MK2 axis. However, the role of MK2 kinase in CS-induced microglial inflammation is not yet clearly understood. Therefore, we have used an MK2 inhibitor, PF-3644022 to study modulation of CS-extract induced oxidative and inflammatory signaling in a mouse microglial cell line, Furthermore, we also evaluated the enzymatic activity of acetylcholinesterase (AChE) on a direct exposure of enzyme with CS. CS exposure led to microglial cytotoxicity and enhanced the level of oxidative stress and proinflammatory cytokine release by microglial cells. The microglial cells pretreated with MK2 inhibitor, PF-3644022 significantly reduced the levels of oxidative stress markers, proinflammatory markers, and improved the level of antioxidant proteins in these cells. In addition, direct exposure of CS showed reduction in the enzymatic activity of AChE.
Insights
Cigarette smoke (CS) triggers brain inflammation and cognitive decline by activating microglia. An MK2 inhibitor, PF-3644022, reduced CS-induced inflammation and oxidative stress in microglia.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Cigarette smoke (CS) is a significant cause of neuroinflammation, leading to cognitive impairment and neurodegeneration.
- Microglia, the brain's resident immune cells, respond to stress via TLR4, with CS constituents promoting inflammation and oxidative stress through the TLR4-MK2 pathway.
- The precise role of MK2 kinase in CS-induced microglial inflammation remains unclear.
Purpose of the Study:
- To investigate the role of MK2 kinase in CS-induced microglial inflammation and oxidative stress.
- To evaluate the effects of an MK2 inhibitor (PF-3644022) on CS-induced signaling pathways in microglia.
- To assess the impact of direct CS exposure on acetylcholinesterase (AChE) activity.
Main Methods:
- Utilized a mouse microglial cell line exposed to cigarette smoke extract (CSE).
- Administered the MK2 inhibitor PF-3644022 to pretreated cells.
- Assessed cytotoxicity, oxidative stress markers, proinflammatory cytokine release, antioxidant protein levels, and AChE enzymatic activity.
Main Results:
- CS exposure induced microglial cytotoxicity, increased oxidative stress, and elevated proinflammatory cytokine release.
- Pretreatment with PF-3644022 significantly attenuated CS-induced oxidative stress and inflammation markers.
- PF-3644022 treatment improved the levels of antioxidant proteins in microglia exposed to CS.
- Direct CS exposure reduced the enzymatic activity of acetylcholinesterase (AChE).
Conclusions:
- MK2 kinase plays a critical role in mediating CS-induced neuroinflammation and oxidative stress in microglia.
- Inhibiting MK2 kinase offers a potential therapeutic strategy to mitigate CS-induced neurotoxicity.
- CS exposure directly impairs AChE activity, suggesting a link to cognitive dysfunction.
