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Luteolin targets MKK4 to attenuate particulate matter-induced MMP-1 and inflammation in human keratinocytes
1Department of Food Science and Technology, Korea National University of Transportation, Jeungpyeong, Republic of Korea.
Abstract:
Particulate matter (PM) is an environmental pollutant that causes premature skin aging and inflammation. In the present study, we investigated the protective effects of luteolin, a bioactive flavonoid, against PM-induced skin damage in human keratinocytes (HaCaT cells). We examined the antioxidant and anti-inflammatory properties of luteolin, focusing on its ability to inhibit key markers of skin aging and inflammation, specifically matrix metalloproteinase-1 (MMP-1) and cyclooxygenase-2 (COX-2). The results demonstrated that luteolin effectively suppressed PM-induced MMP-1 and COX-2 expression and reduced the production of the proinflammatory cytokine IL-6. Mechanistically, luteolin inhibited the activation of AP-1 and NF-κB pathways and decreased reactive oxygen species (ROS) levels in HaCaT cells. Additionally, luteolin binds directly to mitogen-activated protein kinase kinase (MKK) 4, inhibiting its kinase activity and subsequently reducing the phosphorylation of JNK1/2 and p38 mitogen-activated protein kinase. These findings suggest that luteolin can mitigate PM-induced skin aging and inflammation through multiple molecular pathways, highlighting its potential as a therapeutic agent to protect skin health.
Insights
Luteolin protects skin from pollution damage by reducing inflammation and aging markers. This flavonoid inhibits key pathways involved in particulate matter-induced skin damage.
Area of Science:
- Dermatology
- Environmental Science
- Biochemistry
Background:
- Particulate matter (PM) is a significant environmental pollutant.
- PM exposure accelerates skin aging and triggers inflammation.
- Human keratinocytes (HaCaT cells) are crucial for skin barrier function.
Purpose of the Study:
- To investigate the protective effects of luteolin against PM-induced skin damage.
- To evaluate luteolin's antioxidant and anti-inflammatory properties in HaCaT cells.
- To elucidate the molecular mechanisms underlying luteolin's protective action.
Main Methods:
- Treatment of HaCaT cells with particulate matter and luteolin.
- Assay of matrix metalloproteinase-1 (MMP-1) and cyclooxygenase-2 (COX-2) expression.
- Measurement of interleukin-6 (IL-6) production.
- Analysis of AP-1 and NF-κB pathway activation.
- Assessment of reactive oxygen species (ROS) levels.
- Investigation of luteolin's interaction with mitogen-activated protein kinase kinase (MKK) 4 and downstream signaling.
Main Results:
- Luteolin significantly suppressed PM-induced MMP-1 and COX-2 expression.
- Luteolin reduced the production of the pro-inflammatory cytokine IL-6.
- Luteolin inhibited AP-1 and NF-κB pathway activation and decreased ROS levels.
- Luteolin directly bound to MKK4, inhibiting its activity and downstream JNK1/2 and p38 MAPK phosphorylation.
Conclusions:
- Luteolin demonstrates potent antioxidant and anti-inflammatory effects against PM-induced skin damage.
- Luteolin mitigates PM-induced skin aging and inflammation via multiple molecular pathways.
- Luteolin shows promise as a therapeutic agent for protecting skin health from environmental pollutants.
