Infiltration and activation of inflammatory leukocytes drive the pathophysiology of asthma and chronic obstructive pulmonary disease (COPD), two lung inflammatory diseases (LIDs) that produce signiflcant human suffering and consume considerable medical resources. Eosinophils and neutrophils express different members of the siglec family of glycan binding proteins, and siglec activation on either cell population suppresses lung inflammation by inducing granulocyte apoptosis. In humans, eosinophils express Siglec-8 and neutrophils express Siglec-9. Candidate ligands that bind these siglecs were identified through in vitro glycan array screening, predicting key structural features to be expected of potent, endogenous siglec counter-receptors. However, endogenous glycan counter-receptors for Siglec-8 and -9, as well as the proteins or lipids to which they are attached remain to be determined. Furthermore, the mechanisms that control the expression of siglec counter-receptors are unknown, but, if understood, could be invoked to facilitate granulocyte apoptosis through enhanced counter-receptor synthesis. HYPOTHESIS: The expression of endogenous siglec counter-receptors is regulated by innate signaling mechanisms that coordinate the presentation of potent pro- and anti-infiammatory glycans.
AIMS : The total glycome of human lung tissue and isolated cell types will be characterized by mass spectrometry and orthogonal analytic approaches to define the full diversity of potential siglec counter-receptor configurations. In collaboration with Proiect 3 (Schnaar), proteomic analysis of affinity-purified materials extracted from human lung tissue will identify protein carriers that present siglec counter-receptors. Emerging evidence reveals crosstalk between siglec and toll-like receptor signaling, indicating the existence of innate regulatory networks for controlling glycan expression. Therefore, dynamic changes in cell-specific glycan expression will be assessed following cytokine or Toll-like receptor agonist administration to isolated and co-cultured lung cell types.
The aims are designed to identify the diversity of endogenous counter-receptors for siglecs and to deconvolute the signaling pathways that regulate counter-receptor expression in order to enhance the development of potent therapeutics.
This project will identify glycan structures that possess anti-inflammatory activity in lung inflammatory diseases (LID) such as asthma and chronic obstructive pulmonary disease. The mechanism by which lung tissue and leukocytes normally control the synthesis of these anti-inflammatory glycans will also be studied in order to enhance their production and thereby reduce LID severity.
|O'Sullivan, Jeremy A; Bochner, Bruce S (2017) Eosinophils and eosinophil-associated diseases: An update. J Allergy Clin Immunol :|
|Yu, Huifeng; Gonzalez-Gil, Anabel; Wei, Yadong et al. (2017) Siglec-8 and Siglec-9 binding specificities and endogenous airway ligand distributions and properties. Glycobiology 27:657-668|
|O'Sullivan, Jeremy A; Carroll, Daniela J; Cao, Yun et al. (2017) Leveraging Siglec-8 endocytic mechanisms to kill human eosinophils and malignant mast cells. J Allergy Clin Immunol :|
|Carroll, Daniela J; O'Sullivan, Jeremy A; Nix, David B et al. (2017) Sialic acid-binding immunoglobulin-like lectin 8 (Siglec-8) is an activating receptor mediating ?2-integrin-dependent function in human eosinophils. J Allergy Clin Immunol :|
|Guo, Hongbo; de Vries, Erik; McBride, Ryan et al. (2017) Highly Pathogenic Influenza A(H5Nx) Viruses with Altered H5 Receptor-Binding Specificity. Emerg Infect Dis 23:220-231|
|Lou, Hongfei; Lu, Jingning; Choi, Eun Byul et al. (2017) Expression of IL-22 in the Skin Causes Th2-Biased Immunity, Epidermal Barrier Dysfunction, and Pruritus via Stimulating Epithelial Th2 Cytokines and the GRP Pathway. J Immunol 198:2543-2555|
|Peng, Wenjie; Paulson, James C (2017) CD22 Ligands on a Natural N-Glycan Scaffold Efficiently Deliver Toxins to B-Lymphoma Cells. J Am Chem Soc 139:12450-12458|
|Schnaar, Ronald L; Lee, Yuan C (2017) Discoveries of the structures of sialic acid and CMP-sialic acid (1957-1960): A letter from Saul Roseman. Glycobiology :|
|Wu, Nicholas C; Xie, Jia; Zheng, Tianqing et al. (2017) Diversity of Functionally Permissive Sequences in the Receptor-Binding Site of Influenza Hemagglutinin. Cell Host Microbe 21:742-753.e8|
|Schleimer, Robert P; Schnaar, Ronald L; Bochner, Bruce S (2016) Regulation of airway inflammation by Siglec-8 and Siglec-9 sialoglycan ligand expression. Curr Opin Allergy Clin Immunol 16:24-30|
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