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Oxylipin Profiling of Airway Structural Cells Is Unique and Modified by Relevant Stimuli
Shana Kahnamoui1,2, Tanja Winter3,4, Dylan Lloyd5
1Department of Physiology and Pathophysiology, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg R3E0J9, Canada.
Journal of Proteome Research
|January 3, 2025
Summary
Lung structural cells produce diverse oxylipins. This study characterized oxylipin profiles in airway smooth muscle, fibroblasts, and epithelial cells, revealing cell-specific responses to stimuli, highlighting cytochrome P450 oxylipins in respiratory health.
Area of Science:
- * Respiratory physiology
- * Lipid mediator biology
- * Cellular signaling
Background:
- * Oxylipins, derived from fatty acids, are crucial lipid mediators in respiratory function.
- * The specific contributions of lung structural cells (airway smooth muscle, lung fibroblasts, epithelial cells) to oxylipin profiles remain largely uncharacterized.
- * Understanding these profiles is key to deciphering respiratory physiology and disease mechanisms.
Purpose of the Study:
- * To comprehensively characterize the baseline oxylipin profiles of human airway smooth muscle (ASM), lung fibroblast (HLF), and human bronchial epithelial (HBE) cells.
- * To investigate how these oxylipin profiles change upon stimulation with factors relevant to contractility, fibrosis, and inflammation.
- * To elucidate the role of specific oxylipin pathways, particularly cytochrome P450 (CYP450), in lung structural cells.
Main Methods:
- * Cultured human ASM, HLF, and HBE cells were utilized.
- * High-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was employed to quantify oxylipins.
- * Cells were analyzed at baseline and after stimulation with modulators of contractility, fibrosis, and inflammation.
Main Results:
- * A total of 162 oxylipins were identified and measured.
- * Baseline profiles of ASM and HLF cells were similar, rich in CYP450 epoxygenase metabolites.
- * HBE cells exhibited a distinct baseline profile, enriched with cyclooxygenase (COX)-derived oxylipins.
- * TGFβ stimulation suppressed CYP450 oxylipins in HLF but increased them in HBE cells.
- * ASM stimulation led to increased prostaglandin production.
Conclusions:
- * Lung structural cells possess distinct and dynamic oxylipin profiles.
- * Cytochrome P450-derived oxylipins are significant in lung structural cells and warrant further investigation in respiratory physiology.
- * These findings provide a foundation for understanding oxylipin functions in regulating lung contraction, inflammation, and fibrotic processes.
