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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | John, Alison E. Brightling, Christopher E. Knox, Alan J. Clifford, Rachel L. |
| Description | Country affiliation: United kingdom Author Affiliation: Clifford RL ( University of Nottingham, City Hospital, Nottingham, UK.) |
| Abstract | Vascular endothelial growth factor (VEGF), a key angiogenic molecule, is aberrantly expressed in several diseases including asthma where it contributes to bronchial vascular remodeling and chronic inflammation. Asthmatic human airway smooth muscle cells hypersecrete VEGF, but the mechanism is unclear. In this study, we defined the mechanism in human airway smooth muscle cells from nonasthmatic and asthmatic patients. We found that asthmatic cells lacked a repression complex at the VEGF promoter, which was present in nonasthmatic cells. Recruitment of G9A, trimethylation of histone H3 at lysine 9 (H3K9me3), and a resultant decrease in RNA polymerase II at the VEGF promoter was critical to repression of VEGF secretion in nonasthmatic cells. At the asthmatic promoter, H3K9me3 was absent because of failed recruitment of G9a; RNA polymerase II binding, in association with TATA-binding protein-associated factor 1, was increased; H3K4me3 was present; and Sp1 binding was exaggerated and sustained. In contrast, DNA methylation and histone acetylation were similar in asthmatic and nonasthmatic cells. This is the first study, to our knowledge, to show that airway cells in asthma have altered epigenetic regulation of remodeling gene(s). Histone methylation at genes such as VEGF may be an important new therapeutic target. |
| ISSN | 00221767 |
| e-ISSN | 15506606 |
| DOI | 10.4049/jimmunol.1103641 |
| Journal | The Journal of Immunology |
| Issue Number | 2 |
| Volume Number | 189 |
| Language | English |
| Publisher | The American Association of Immunologists |
| Publisher Date | 2012-07-15 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Asthma Metabolism Pathology Bronchi Dna Methylation Histones Myocytes, Smooth Muscle Up-regulation Immunology Vascular Endothelial Growth Factor A Airway Remodeling Genetics Secretion Cells, Cultured Protein Isoforms Transcription, Genetic Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't Discipline Immunology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Immunology and Allergy Immunology |
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