Cellular and Humoral Autoreactivity in Idiopathic Pulmonary Fibrosis

Idiopathic pulmonary fibrosis (IPF) is a morbid, refractory lung disorder with an unknown pathogenesis. To investigate potential adaptive immune mechanisms in IPF, we compared phenotypes and effector functions of peripheral CD4 T cells, autoantibody production, and proliferative responses of pulmona...

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Published in	Journal of Immunology Vol. 179; no. 4; pp. 2592 - 2599
Main Authors	Feghali-Bostwick, Carol A, Tsai, Christopher G, Valentine, Vincent G, Kantrow, Stephen, Stoner, Michael W, Pilewski, Joseph M, Gadgil, Aneal, George, M. Patricia, Gibson, Kevin F, Choi, Augustine M. K, Kaminski, Naftali, Zhang, Yingze, Duncan, Steven R
Format	Journal Article
Language	English
Published	United States Am Assoc Immnol 15.08.2007
Subjects	Adult Aged Antibody Formation - immunology Autoantibodies - immunology Autoantigens - immunology Autoimmunity CD4-Positive T-Lymphocytes - immunology CD4-Positive T-Lymphocytes - pathology Cell Proliferation Cytokines - immunology Female Humans Immunoglobulin G - immunology Lung - immunology Lung - pathology Lymph Nodes - immunology Lymph Nodes - pathology Male Middle Aged Pulmonary Fibrosis - immunology Pulmonary Fibrosis - pathology Pulmonary Fibrosis - therapy
Online Access	Get full text
ISSN	0022-1767 1550-6606 1365-2567
DOI	10.4049/jimmunol.179.4.2592

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Abstract	Idiopathic pulmonary fibrosis (IPF) is a morbid, refractory lung disorder with an unknown pathogenesis. To investigate potential adaptive immune mechanisms in IPF, we compared phenotypes and effector functions of peripheral CD4 T cells, autoantibody production, and proliferative responses of pulmonary hilar lymph node CD4 T cells to autologous lung extracts from afflicted patients and normals. Our results show that greater proportions of peripheral CD4 T lymphocytes in IPF subjects expressed MHC class II and CD154 (CD40L), and they more frequently elaborated TGF-β1, IL-10, and TNF-α. Abnormal CD4 T cell clonal expansions were found in all IPF patients, and 82% of these subjects also had IgG autoantibodies against cellular Ags. IPF lung extracts stimulated proliferations of autologous CD4 T cells, unlike preparations from normals or those with other lung diseases, and the IPF proliferative responses were enhanced by repeated cycles of stimulation. Thus, CD4 T cells from IPF patients have characteristics typical of cell-mediated pathologic responses, including augmented effector functions, provision of facultative help for autoantibody production, oligoclonal expansions, and proliferations driven by an Ag present in diseased tissues. Recognition that an autoreactive immune process is present in IPF can productively focus efforts toward identifying the responsible Ag, and implementing more effective therapies.
AbstractList	Idiopathic pulmonary fibrosis (IPF) is a morbid, refractory lung disorder with an unknown pathogenesis. To investigate potential adaptive immune mechanisms in IPF, we compared phenotypes and effector functions of peripheral CD4 T cells, autoantibody production, and proliferative responses of pulmonary hilar lymph node CD4 T cells to autologous lung extracts from afflicted patients and normals. Our results show that greater proportions of peripheral CD4 T lymphocytes in IPF subjects expressed MHC class II and CD154 (CD40L), and they more frequently elaborated TGF- beta 1, IL-10, and TNF- alpha . Abnormal CD4 T cell clonal expansions were found in all IPF patients, and 82% of these subjects also had IgG autoantibodies against cellular Ags. IPF lung extracts stimulated proliferations of autologous CD4 T cells, unlike preparations from normals or those with other lung diseases, and the IPF proliferative responses were enhanced by repeated cycles of stimulation. Thus, CD4 T cells from IPF patients have characteristics typical of cell-mediated pathologic responses, including augmented effector functions, provision of facultative help for autoantibody production, oligoclonal expansions, and proliferations driven by an Ag present in diseased tissues. Recognition that an autoreactive immune process is present in IPF can productively focus efforts toward identifying the responsible Ag, and implementing more effective therapies. Idiopathic pulmonary fibrosis (IPF) is a morbid, refractory lung disorder with an unknown pathogenesis. To investigate potential adaptive immune mechanisms in IPF, we compared phenotypes and effector functions of peripheral CD4 T cells, autoantibody production, and proliferative responses of pulmonary hilar lymph node CD4 T cells to autologous lung extracts from afflicted patients and normals. Our results show that greater proportions of peripheral CD4 T lymphocytes in IPF subjects expressed MHC class II and CD154 (CD40L), and they more frequently elaborated TGF-β1, IL-10, and TNF-α. Abnormal CD4 T cell clonal expansions were found in all IPF patients, and 82% of these subjects also had IgG autoantibodies against cellular Ags. IPF lung extracts stimulated proliferations of autologous CD4 T cells, unlike preparations from normals or those with other lung diseases, and the IPF proliferative responses were enhanced by repeated cycles of stimulation. Thus, CD4 T cells from IPF patients have characteristics typical of cell-mediated pathologic responses, including augmented effector functions, provision of facultative help for autoantibody production, oligoclonal expansions, and proliferations driven by an Ag present in diseased tissues. Recognition that an autoreactive immune process is present in IPF can productively focus efforts toward identifying the responsible Ag, and implementing more effective therapies. Idiopathic pulmonary fibrosis (IPF) is a morbid, refractory lung disorder with an unknown pathogenesis. To investigate potential adaptive immune mechanisms in IPF, we compared phenotypes and effector functions of peripheral CD4 T cells, autoantibody production, and proliferative responses of pulmonary hilar lymph node CD4 T cells to autologous lung extracts from afflicted patients and normals. Our results show that greater proportions of peripheral CD4 T lymphocytes in IPF subjects expressed MHC class II and CD154 (CD40L), and they more frequently elaborated TGF-beta1, IL-10, and TNF-alpha. Abnormal CD4 T cell clonal expansions were found in all IPF patients, and 82% of these subjects also had IgG autoantibodies against cellular Ags. IPF lung extracts stimulated proliferations of autologous CD4 T cells, unlike preparations from normals or those with other lung diseases, and the IPF proliferative responses were enhanced by repeated cycles of stimulation. Thus, CD4 T cells from IPF patients have characteristics typical of cell-mediated pathologic responses, including augmented effector functions, provision of facultative help for autoantibody production, oligoclonal expansions, and proliferations driven by an Ag present in diseased tissues. Recognition that an autoreactive immune process is present in IPF can productively focus efforts toward identifying the responsible Ag, and implementing more effective therapies. Idiopathic pulmonary fibrosis (IPF) is a morbid, refractory lung disorder with an unknown pathogenesis. To investigate potential adaptive immune mechanisms in IPF, we compared phenotypes and effector functions of peripheral CD4 T cells, autoantibody production, and proliferative responses of pulmonary hilar lymph node CD4 T cells to autologous lung extracts from afflicted patients and normals. Our results show that greater proportions of peripheral CD4 T lymphocytes in IPF subjects expressed MHC class II and CD154 (CD40L), and they more frequently elaborated TGF-beta1, IL-10, and TNF-alpha. Abnormal CD4 T cell clonal expansions were found in all IPF patients, and 82% of these subjects also had IgG autoantibodies against cellular Ags. IPF lung extracts stimulated proliferations of autologous CD4 T cells, unlike preparations from normals or those with other lung diseases, and the IPF proliferative responses were enhanced by repeated cycles of stimulation. Thus, CD4 T cells from IPF patients have characteristics typical of cell-mediated pathologic responses, including augmented effector functions, provision of facultative help for autoantibody production, oligoclonal expansions, and proliferations driven by an Ag present in diseased tissues. Recognition that an autoreactive immune process is present in IPF can productively focus efforts toward identifying the responsible Ag, and implementing more effective therapies.Idiopathic pulmonary fibrosis (IPF) is a morbid, refractory lung disorder with an unknown pathogenesis. To investigate potential adaptive immune mechanisms in IPF, we compared phenotypes and effector functions of peripheral CD4 T cells, autoantibody production, and proliferative responses of pulmonary hilar lymph node CD4 T cells to autologous lung extracts from afflicted patients and normals. Our results show that greater proportions of peripheral CD4 T lymphocytes in IPF subjects expressed MHC class II and CD154 (CD40L), and they more frequently elaborated TGF-beta1, IL-10, and TNF-alpha. Abnormal CD4 T cell clonal expansions were found in all IPF patients, and 82% of these subjects also had IgG autoantibodies against cellular Ags. IPF lung extracts stimulated proliferations of autologous CD4 T cells, unlike preparations from normals or those with other lung diseases, and the IPF proliferative responses were enhanced by repeated cycles of stimulation. Thus, CD4 T cells from IPF patients have characteristics typical of cell-mediated pathologic responses, including augmented effector functions, provision of facultative help for autoantibody production, oligoclonal expansions, and proliferations driven by an Ag present in diseased tissues. Recognition that an autoreactive immune process is present in IPF can productively focus efforts toward identifying the responsible Ag, and implementing more effective therapies.
Author	Stoner, Michael W Gadgil, Aneal Kantrow, Stephen Pilewski, Joseph M Gibson, Kevin F Zhang, Yingze Valentine, Vincent G Duncan, Steven R Feghali-Bostwick, Carol A Kaminski, Naftali George, M. Patricia Choi, Augustine M. K Tsai, Christopher G
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Snippet	Idiopathic pulmonary fibrosis (IPF) is a morbid, refractory lung disorder with an unknown pathogenesis. To investigate potential adaptive immune mechanisms in...
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SubjectTerms	Adult Aged Antibody Formation - immunology Autoantibodies - immunology Autoantigens - immunology Autoimmunity CD4-Positive T-Lymphocytes - immunology CD4-Positive T-Lymphocytes - pathology Cell Proliferation Cytokines - immunology Female Humans Immunoglobulin G - immunology Lung - immunology Lung - pathology Lymph Nodes - immunology Lymph Nodes - pathology Male Middle Aged Pulmonary Fibrosis - immunology Pulmonary Fibrosis - pathology Pulmonary Fibrosis - therapy
Title	Cellular and Humoral Autoreactivity in Idiopathic Pulmonary Fibrosis
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