| Inhaled endotoxin in healthy human subjects: a dose-related study on systemic effects and peripheral CD4+ and CD8+ T cells. | |
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MedLine Citation:
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PMID: 16039108 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Inhaled endotoxin or lipopolysaccharide (LPS) is implicated in the pathogenesis of pulmonary diseases. We investigated the inhalation effects of two different doses of LPS in healthy human subjects. METHODS: Eighteen healthy non-atopic human subjects inhaled either 15 microg (n=10) or 50 microg (n=8)Escherichia coli LPS in an open study. As control, each subject had isotonic saline inhalation 1 week before (baseline) and after LPS inhalation. Data collected included those of clinical parameter, induced sputum and peripheral blood CD4+ and CD8+ T cells. RESULTS: Acute flu-like symptoms and pyrexia were significantly greater in the 50 microg than 15 microg LPS group. Similarly, the increase in sputum and blood total cell and neutrophil counts at 6h following inhaled LPS were greater in the 50 microg group. Myeloperoxidase, human neutrophil elastase and interleukin-8 in sputum sol, but not blood, showed a trend towards greater increase following 50 microg LPS. All these changes were resolved at one week. In the 50 microg dose group alone, there was a reduction in the proportion of peripheral blood interferon (IFN)-gamma-producing CD4+ and CD8+ T cells at 6h followed by an increase at 1 week after inhaled LPS. CONCLUSIONS: The airway and systemic effects of inhaled LPS are dose-related and predominantly neutrophilic. The changes in the proportions of circulating CD4+ and CD8+ T cells suggests preferential recruitment of IFN-gamma-producing T cells into tissue from inhaled 50 microg LPS, followed by reappearance of these cells in blood 1 week later. |
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Authors:
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L C Loh; B Vyas; V Kanabar; D M Kemeny; B J O'Connor |
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Publication Detail:
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Type: Journal Article Date: 2005-07-20 |
Journal Detail:
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Title: Respiratory medicine Volume: 100 ISSN: 0954-6111 ISO Abbreviation: Respir Med Publication Date: 2006 Mar |
Date Detail:
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Created Date: 2006-02-15 Completed Date: 2006-08-29 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8908438 Medline TA: Respir Med Country: England |
Other Details:
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Languages: eng Pagination: 519-28 Citation Subset: IM |
Affiliation:
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Department of Medicine, Clinical School, International Medical University, Jalan Rasah, Seremban 70300, Negeri Sembilan, Malaysia. loh@imu.edu.my |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Administration, Inhalation Adult CD4-Positive T-Lymphocytes / drug effects*, metabolism CD8-Positive T-Lymphocytes / drug effects*, metabolism Dose-Response Relationship, Drug Female Humans Lipopolysaccharides / administration & dosage, adverse effects* Lymphocyte Count Male Sputum / cytology |
| Chemical | |
Reg. No./Substance:
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0/Lipopolysaccharides |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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