Early phase resolution of mucosal eosinophilic inflammation in allergic rhinitis
<p>Abstract</p> <p>Background</p> <p>It is widely assumed that apoptosis of eosinophils is a central component of resolution of allergic airway disease. However, this has not been demonstrated in human allergic airways in vivo. Based on animal in vivo observations we hy...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2010-05-01
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| Series: | Respiratory Research |
| Online Access: | http://respiratory-research.com/content/11/1/54 |
| _version_ | 1819034380039880704 |
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| author | Erjefält Jonas S Andersson Morgan Emanuelsson Cecilia Uller Lena Greiff Lennart Persson Carl G |
| author_facet | Erjefält Jonas S Andersson Morgan Emanuelsson Cecilia Uller Lena Greiff Lennart Persson Carl G |
| author_sort | Erjefält Jonas S |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>It is widely assumed that apoptosis of eosinophils is a central component of resolution of allergic airway disease. However, this has not been demonstrated in human allergic airways in vivo. Based on animal in vivo observations we hypothesised that steroid-induced resolution of human airway eosinophilic inflammation involves inhibition of CCL5 (RANTES), a CC-chemokine regulating eosinophil and lymphocyte traffic, and elimination of eosinophils without evident occurrence of apoptotic eosinophils in the diseased tissue.</p> <p>Objective</p> <p>To determine mucosal eosinophilia, apoptotic eosinophils, general cell apoptosis and cell proliferation, and expression of CCL5 and CCL11 (eotaxin) in human allergic airway tissues <it>in vivo </it>at resolution of established symptomatic eosinophilic inflammation.</p> <p>Methods</p> <p>Twenty-one patients with intermittent (birch and/or grass) allergic rhinitis received daily nasal allergen challenges for two seven days' periods separated by more than two weeks washout. Five days into these "artificial pollen seasons", nasal treatment with budesonide was instituted and continued for six days in a double blinded, randomized, placebo-controlled, and crossover design. This report is a parallel group comparison of nasal biopsy histochemistry data obtained on the final day of the second treatment period.</p> <p>Results</p> <p>Treatments were instituted when clinical rhinitis symptoms had been established. Compared to placebo, budesonide reduced tissue eosinophilia, and subepithelial more than epithelial eosinophilia. Steroid treatment also attenuated tissue expression of CCL5, but CCL11 was not reduced. General tissue cell apoptosis and epithelial cell proliferation were reduced by budesonide. However, apoptotic eosinophils were not detected in any biopsies, irrespective of treatment.</p> <p>Conclusions</p> <p>Inhibition of CCL5-dependent recruitment of cells to diseased airway tissue, and reduced cell proliferation, reduced general cell apoptosis, but not increased eosinophil apoptosis, are involved in early phase steroid-induced resolution of human allergic rhinitis.</p> |
| first_indexed | 2024-12-21T07:32:48Z |
| format | Article |
| id | doaj.art-bdb9c4b61cc04f1ba937891a8628a6e7 |
| institution | Directory Open Access Journal |
| issn | 1465-9921 |
| language | English |
| last_indexed | 2024-12-21T07:32:48Z |
| publishDate | 2010-05-01 |
| publisher | BMC |
| record_format | Article |
| series | Respiratory Research |
| spelling | doaj.art-bdb9c4b61cc04f1ba937891a8628a6e72022-12-21T19:11:31ZengBMCRespiratory Research1465-99212010-05-011115410.1186/1465-9921-11-54Early phase resolution of mucosal eosinophilic inflammation in allergic rhinitisErjefält Jonas SAndersson MorganEmanuelsson CeciliaUller LenaGreiff LennartPersson Carl G<p>Abstract</p> <p>Background</p> <p>It is widely assumed that apoptosis of eosinophils is a central component of resolution of allergic airway disease. However, this has not been demonstrated in human allergic airways in vivo. Based on animal in vivo observations we hypothesised that steroid-induced resolution of human airway eosinophilic inflammation involves inhibition of CCL5 (RANTES), a CC-chemokine regulating eosinophil and lymphocyte traffic, and elimination of eosinophils without evident occurrence of apoptotic eosinophils in the diseased tissue.</p> <p>Objective</p> <p>To determine mucosal eosinophilia, apoptotic eosinophils, general cell apoptosis and cell proliferation, and expression of CCL5 and CCL11 (eotaxin) in human allergic airway tissues <it>in vivo </it>at resolution of established symptomatic eosinophilic inflammation.</p> <p>Methods</p> <p>Twenty-one patients with intermittent (birch and/or grass) allergic rhinitis received daily nasal allergen challenges for two seven days' periods separated by more than two weeks washout. Five days into these "artificial pollen seasons", nasal treatment with budesonide was instituted and continued for six days in a double blinded, randomized, placebo-controlled, and crossover design. This report is a parallel group comparison of nasal biopsy histochemistry data obtained on the final day of the second treatment period.</p> <p>Results</p> <p>Treatments were instituted when clinical rhinitis symptoms had been established. Compared to placebo, budesonide reduced tissue eosinophilia, and subepithelial more than epithelial eosinophilia. Steroid treatment also attenuated tissue expression of CCL5, but CCL11 was not reduced. General tissue cell apoptosis and epithelial cell proliferation were reduced by budesonide. However, apoptotic eosinophils were not detected in any biopsies, irrespective of treatment.</p> <p>Conclusions</p> <p>Inhibition of CCL5-dependent recruitment of cells to diseased airway tissue, and reduced cell proliferation, reduced general cell apoptosis, but not increased eosinophil apoptosis, are involved in early phase steroid-induced resolution of human allergic rhinitis.</p>http://respiratory-research.com/content/11/1/54 |
| spellingShingle | Erjefält Jonas S Andersson Morgan Emanuelsson Cecilia Uller Lena Greiff Lennart Persson Carl G Early phase resolution of mucosal eosinophilic inflammation in allergic rhinitis Respiratory Research |
| title | Early phase resolution of mucosal eosinophilic inflammation in allergic rhinitis |
| title_full | Early phase resolution of mucosal eosinophilic inflammation in allergic rhinitis |
| title_fullStr | Early phase resolution of mucosal eosinophilic inflammation in allergic rhinitis |
| title_full_unstemmed | Early phase resolution of mucosal eosinophilic inflammation in allergic rhinitis |
| title_short | Early phase resolution of mucosal eosinophilic inflammation in allergic rhinitis |
| title_sort | early phase resolution of mucosal eosinophilic inflammation in allergic rhinitis |
| url | http://respiratory-research.com/content/11/1/54 |
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