IL-32 expression in the airway epithelial cells of patients with Mycobacterium avium complex lung disease.
Summary of "IL-32 expression in the airway epithelial cells of patients with Mycobacterium avium complex lung disease."
Lung disease due to Mycobacterium avium complex (MAC) organisms is increasing. A greater understanding of the host immune response to MAC organisms will provide a foundation to develop novel therapies for these recalcitrant infections. IL-32 is a newly described pro-inflammatory cytokine that enhances host immunity against various microbial pathogens. Cytokines that induce IL-32 such as interferon-gamma, IL-18, IL-12 and tumor necrosis factor-alpha are of considerable importance to mycobacterial immunity. We performed immunohistochemistry and morphometric analysis to quantify IL-32 expression in the lungs of 11 patients with MAC lung disease and 10 controls with normal lung tissues. After normalizing for basement membrane length, there was a profound increase in IL-32 expression in the airway epithelial cells of the MAC-infected lungs compared with controls. Following normalization for alveolar surface area, there was a trend toward increased IL-32 expression in type II alveolar cells and alveolar macrophages in the lungs of MAC patients. Human airway epithelial cells (BEAS-2B) infected with M. avium produced IL-32 by a nuclear factor-kappa B-dependent mechanism. In both BEAS-2B cells and human monocyte-derived macrophages, exogenous IL-32γ significantly reduced the growth of intracellular M. avium. This finding was corroborated by an increase in the number of intracellular M. avium recovered from THP-1 monocytes silenced for endogenous IL-32 expression. The anti-mycobacterial effect of IL-32 may be due, in part, to increased apoptosis of infected cells. These findings indicate that IL-32 facilitates host defense against MAC organisms but may also contribute to the airway inflammation associated with MAC pulmonary disease.
Department of Medicine, Denver Veterans Affairs Medical Center, Denver, CO 80220, USA.
This article was published in the following journal.
Name: International immunology
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22033195
- DOI: http://dx.doi.org/10.1093/intimm/dxr075
Insult or injury to the lung epithelial cells from pathogens, pollutants, and allergens can initiate the process of apoptotic cell death. Although "Creola bodies," which are clusters of uncleared, apo...
Airway epithelial cells (AEC) from patients with asthma, appear to have an impaired interferon (IFN)-β and -λ response to infection with rhinovirus.
Mycobacterium avium is abundant in the environment. It has four subspecies: the human or porcine type M. avium ss. hominissuis, the bird type M. avium ss. avium serotype 1 and serotype 2, 3 (also M. a...
Delphinidin is one of the anthocyanidins. It is believed to have anti-inflammatory property including antioxidant, antiangiogenic, and anti-cancer properties. However, the anti-inflammatory effect of ...
The existence and identity of multi-potent stem cells in the adult lung is currently highly debated. At present, it remains unclear whether candidate stem/progenitor cells are located in the airways, ...
To evaluate the efficacy and safety of azithromycin administered once a week in the prevention of disseminated Mycobacterium avium complex (MAC) in severely immunocompromised HIV-infected ...
To determine whether clarithromycin is safe and effective in preventing disseminated Mycobacterium avium Complex in HIV-infected patients with CD4 counts
The primary objectives of this trial are: To compare the safety of oral rifabutin versus placebo in the treatment of Mycobacterium avium complex (MAC) bacteremia in AIDS patients with CD4 ...
To optimize Mycobacterium avium Complex (MAC) prophylaxis in AIDS patients by measuring serum rifabutin levels and adjusting the dose accordingly. To combine rifabutin with ethambutol to e...
The primary objective of this trial is to assess the safety and the relative benefit of rifabutin monotherapy in preventing or delaying the incidence of Mycobacterium avium complex (MAC) b...
Medical and Biotech [MESH] Definitions
A nontuberculous infection when occurring in humans. It is characterized by pulmonary disease, lymphadenitis in children, and systemic disease in AIDS patients. Mycobacterium avium-intracellulare infection of birds and swine results in tuberculosis.
A complex that includes several strains of M. avium. M. intracellulare is not easily distinguished from M. avium and therefore is included in the complex. These organisms are most frequently found in pulmonary secretions from persons with a tuberculous-like mycobacteriosis. Strains of this complex have also been associated with childhood lymphadenitis and AIDS; M. avium alone causes tuberculosis in a variety of birds and other animals, including pigs.
A broad-spectrum antibiotic that is being used as prophylaxis against disseminated Mycobacterium avium complex infection in HIV-positive patients.
A bacterium causing tuberculosis in domestic fowl and other birds. In pigs, it may cause localized and sometimes disseminated disease. The organism occurs occasionally in sheep and cattle. It should be distinguished from the M. avium complex, which infects primarily humans.
A variety of TUBERCULOSIS affecting various birds, including chickens and ducks. It is caused by MYCOBACTERIUM AVIUM and characterized by tubercles consisting principally of epithelioid cells.