There is immense potential to generate a variety of bioactive lipids in the lung in response to injury and infection. The central theme of this proposal is that lipid mediators have diverse functions in controlling the amplitude of the inflammatory response and its resolution. Our goals are to define the role of specific lipid mediators in protecting the lung during inflammatory injury and infection, and to determine how the environmental toxicant ozone induces production of novel lipid metabolites that interfere with these processes leading to pathological consequences. The objectives are to: Elucidate mechanisms of Group IVA cytosolic phospholipase A2 activation and eicosanoid production in resident peritoneal and alveolar macrophages by Cantjida albicans and Aspergillus fumigatus, and determine the role of this pathway in regulating immune responses to fungal infection in the lung. Define the mechanisms of production of the novel lipid mediator lysophosphatidylserine by neutrophils and macrophages, and determine how it mediates the removal of apoptotic cells and suppresses pro-inflammatory cytokine production to promote the resoiution of lung inflammation. Structurally characterize by mass spectrometry novel lipid mediators produced following exposure of lung surfactant to low levels of ozone, and to determine their impact on the ability of the lung to control inflammation and infection. Novel mass spectrometry approaches will be developed to image these lipid mediators in ozonized lung tissues. This program brings together investigators with diverse expertise in cell biology, biochemistry and structural biology. By using multidisciplinary approaches, we will determine the structural identity of lipid mediators, the molecular mechanisms involved in their production and how they function to regulate lung responses.

Public Health Relevance

The studies in this PPG will enhance our understanding of how specific lipid mediators contribute to the unique ability ofthe lung to protect itself from excess inflammation during injury and infection. Importantly, our ability to identify novel lipid mediators produced as a result of exposure to ozone will provide insight for developing strategies to protect from this deleterious environmental lung toxicant.

National Institute of Health (NIH)
National Heart, Lung, and Blood Institute (NHLBI)
Research Program Projects (P01)
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Heart, Lung, and Blood Program Project Review Committee (HLBP)
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Xiao, Lei
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National Jewish Health
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Zemski Berry, Karin A; Murphy, Robert C; Kosmider, Beata et al. (2017) Lipidomic characterization and localization of phospholipids in the human lung. J Lipid Res 58:926-933
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Kandasamy, Pitchaimani; Numata, Mari; Berry, Karin Zemski et al. (2016) Structural analogs of pulmonary surfactant phosphatidylglycerol inhibit toll-like receptor 2 and 4 signaling. J Lipid Res 57:993-1005
Zemski Berry, Karin A; Murphy, Robert C (2016) Phospholipid Ozonation Products Activate the 5-Lipoxygenase Pathway in Macrophages. Chem Res Toxicol 29:1355-64

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