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Acute keratinocyte damage stimulates platelet-activating factor production
C Alappatt1, C A Johnson, K L Clay
1Department of Dermatology, Indiana University School of Medicine, Indianapolis, USA.
Archives of Dermatological Research
|June 27, 2000
Summary
Platelet-activating factor (PAF) production increases in skin cells after thermal or oxidative damage. This suggests the PAF system plays a role in inflammation following acute epidermal injury.
Area of Science:
- Dermatology
- Lipid Mediator Research
- Cellular Biology
Background:
- Platelet-activating factor (PAF) is a lipid mediator implicated in keratinocyte function and skin inflammation.
- PAF is present in inflammatory skin conditions, and its direct injection causes cutaneous inflammation.
- Keratinocytes produce PAF in response to various stimuli, including cytokines and receptor activation.
Purpose of the Study:
- To investigate if thermal or oxidative damage to keratinocytes induces the production of PAF and related lipids.
- To understand the role of the PAF system in the inflammatory response to epidermal damage.
Main Methods:
- Immortalized human keratinocyte cell line (HaCaT) exposed to heat, cold, or tertiary butyl hydroperoxide (oxidative stress).
- Measurement of PAF and 1-palmitoyl-2-acetyl-GPC using gas chromatography/mass spectrometry.
Main Results:
- Diverse toxic stimuli (heat, cold, oxidative stress) led to the accumulation of PAF and related 1-acyl species in keratinocytes.
- These findings demonstrate that keratinocytes produce PAF in response to acute damage.
Conclusions:
- The PAF system is involved in the inflammatory response following acute epidermal damage.
- Exogenous thermal or oxidative damage stimulates the production of PAF and related lipids in keratinocytes.