Mouse mast cells (MC) express three homologous tryptases (designated mMCP-6, mMCP-7, and mMCP-11), whose genes are clustered on chromosome 17. mMCP-6 and mMCP-7 work in concert to differentially regulated the extravasation of neutrophils and eosinophils into inflammatory sites. mMCP also plays an important role in the regulation of clot formation and fibrinogen/integrin-dependent cellular responses in tissue during MC-mediated inflammatory reactions. Because of their importance in innate and adaptive immunity, MC tryptases are regulated at a number of levels. Nevertheless, transcriptional and post-transcriptional mechanisms appear to be the major ways MC control which tryptases they express. The recent identification of cells that contain substantial amounts of tryptase in the blood of patients with allergy and asthma indicates the urgent need contain substantial amounts of tryptase in the blood of patients with allergy and asthma indicates the urgent need to understand how these proteases are regulated in normal and pathologic circumstances. Thus, the long-term objective of Project 1 is to understand the molecular level how MC control the steady-state levels of the transcripts that encode homologous, but functionally distinct, tryptases. The goal of Specific Aim 1 is to elucidate why the tryptase genes are clustered genes are clustered on chromosome 17. In these studies, the role of gene methylation and histone activation in tryptase expression will be evaluated. The goal of Specific Aim 2 is to determine how transcription of the three tryptase genes is differentially regulated. In these studies, the cis-acting elements and trans-acting factors that regulate the transcription of each gene will be identified. Whether or not a locus a control element regulates of the cultured genes will be determined. The goal of Specific Aim 3 is to understand the two very different post-transcription mechanisms the MC uses to control. the steady-state levels of functional and non-functional transcripts in cells. In these studies, the cis-acting elements in the three tryptase transcripts and the trans-acting RNA-binding proteins in the MC that work together to control the stability of each tryptase transcript will be identified.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Program Projects (P01)
Project #
5P01HL036110-17
Application #
6496745
Study Section
Project Start
2001-09-01
Project End
2002-08-31
Budget Start
1997-10-01
Budget End
1998-09-30
Support Year
17
Fiscal Year
2001
Total Cost
$30,384
Indirect Cost
Name
Brigham and Women's Hospital
Department
Type
DUNS #
071723621
City
Boston
State
MA
Country
United States
Zip Code
02115
Liu, Tao; Barrett, Nora A; Kanaoka, Yoshihide et al. (2018) Type 2 Cysteinyl Leukotriene Receptors Drive IL-33-Dependent Type 2 Immunopathology and Aspirin Sensitivity. J Immunol 200:915-927
Liu, Tao; Garofalo, Denise; Feng, Chunli et al. (2015) Platelet-driven leukotriene C4-mediated airway inflammation in mice is aspirin-sensitive and depends on T prostanoid receptors. J Immunol 194:5061-8
Laidlaw, Tanya M; Cutler, Anya J; Kidder, Molly S et al. (2014) Prostaglandin E2 resistance in granulocytes from patients with aspirin-exacerbated respiratory disease. J Allergy Clin Immunol 133:1692-701.e3
Fanning, Laura B; Buckley, Carolyn C; Xing, Wei et al. (2013) Downregulation of key early events in the mobilization of antigen-bearing dendritic cells by leukocyte immunoglobulin-like Receptor B4 in a mouse model of allergic pulmonary inflammation. PLoS One 8:e57007
Ohta, Shin; Imamura, Mitsuru; Xing, Wei et al. (2013) Group V secretory phospholipase A2 is involved in macrophage activation and is sufficient for macrophage effector functions in allergic pulmonary inflammation. J Immunol 190:5927-38
Cummings, Hannah E; Liu, Tao; Feng, Chunli et al. (2013) Cutting edge: Leukotriene C4 activates mouse platelets in plasma exclusively through the type 2 cysteinyl leukotriene receptor. J Immunol 191:5807-10
Liu, Tao; Laidlaw, Tanya M; Katz, Howard R et al. (2013) Prostaglandin E2 deficiency causes a phenotype of aspirin sensitivity that depends on platelets and cysteinyl leukotrienes. Proc Natl Acad Sci U S A 110:16987-92
Laidlaw, Tanya M; Kidder, Molly S; Bhattacharyya, Neil et al. (2012) Cysteinyl leukotriene overproduction in aspirin-exacerbated respiratory disease is driven by platelet-adherent leukocytes. Blood 119:3790-8
Simarro, Maria; Giannattasio, Giorgio; Xing, Wei et al. (2012) The translational repressor T-cell intracellular antigen-1 (TIA-1) is a key modulator of Th2 and Th17 responses driving pulmonary inflammation induced by exposure to house dust mite. Immunol Lett 146:8-14
Cozzi, Emily; Ackerman, Kate G; Lundequist, Anders et al. (2011) The naive airway hyperresponsiveness of the A/J mouse is Kit-mediated. Proc Natl Acad Sci U S A 108:12787-92

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