Enhanced interleukin-8 release and gene expression in macrophages after exposure to Mycobacterium tuberculosis and its components
| Autor: | William N. Rom, Kevin F. Law, Yihong Zhang, M. Bodkin, H. Cohen, J. Reibman, M. Broser |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Adult
Lipopolysaccharides Male Tuberculosis Gene Expression Inflammation Enzyme-Linked Immunosorbent Assay Biology Phosphatidylinositols Monocytes Mycobacterium tuberculosis Cell Wall Reference Values medicine Animals Humans Interferon gamma Interleukin 8 RNA Messenger Tuberculosis Pulmonary Cells Cultured Antigens Bacterial Lipoarabinomannan Lipomannan Dose-Response Relationship Drug Interleukin-8 General Medicine Macrophage Activation medicine.disease biology.organism_classification Blotting Northern Immunology Macrophages Peritoneal Tumor necrosis factor alpha Female medicine.symptom Bronchoalveolar Lavage Fluid medicine.drug Research Article |
| Zdroj: | The Journal of clinical investigation. 95(2) |
| ISSN: | 0021-9738 |
| Popis: | Mycobacterium tuberculosis infection is accompanied by acute and chronic inflammatory infiltrates associated with necrotizing granulomas in lung tissue. The cellular infiltrate is characterized by inflammatory cells which include neutrophils, lymphocytes, and macrophages. In animal and in vitro models of mycobacterial infection, cytokines including tumor necrosis factor-alpha (TNF-alpha), interferon gamma (IFN-gamma), and interleukin-1 beta (IL-1 beta) participate in granulomatous inflammation. We hypothesized that interleukin-3, a potent chemoattractant for neutrophils and lymphocytes, could be released by activated alveolar macrophages after exposure to M. tuberculosis or its components and contribute to granulomatous lung inflammation. A quantitative immunoassay revealed that IL-8 protein release was significantly elevated in supernatants of macrophages and in lavage fluid obtained from patients with pulmonary tuberculosis compared to normal controls. In addition, Northern blots demonstrated striking up-regulation of IL-8 mRNA in macrophages from these patients. M. tuberculosis and its cell wall components lipoarabinomannan (LAM), lipomannan (LM), and phosphoinositolmannoside (PIM) stimulated IL-8 protein release and mRNA expression in vitro from alveolar macrophages, but deacylated LAM did not. Neutralizing antibodies to TNF-alpha and/or IL-1-alpha and beta blocked 83% of the stimulation. IL-8 synthesis and release is an early response of macrophages after phagocytosis of M. tuberculosis. Its production serves to attract both acute and chronic inflammatory cells of active infection and thus participates in the process of containment of the pathogen. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|