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| Content Provider | PubMed Central |
|---|---|
| Author | Mitchell, Gordon B. Al-haddawi, Muthafar H. Clark, Mary Ellen Beveridge, Jennifer D. Caswell, Jeff L. |
| Copyright Year | 2007 |
| Abstract | Susceptibility to bacterial pneumonia in cattle is enhanced by stressors such as transportation, weaning, and commingling, which trigger a physiologic stress response resulting in elevated levels of endogenous corticosteroids and catecholamines. To determine the effect of neuroendocrine mediators on the expression of innate defense peptides in the lung, bovine tracheal epithelial cells were exposed to dexamethasone, catecholamines, acetylcholine, or substance P, and then β-defensin expression was quantified using real-time reverse transcription-PCR. Basal expression of tracheal antimicrobial peptide (TAP) mRNA was not affected by any of the mediators tested. However, induction of TAP expression by lipopolysaccharide was significantly inhibited by pretreatment with dexamethasone. Bronchial biopsy specimens from dexamethasone-treated calves had significantly lower expression of TAP and lingual antimicrobial peptide (LAP) mRNA than saline-treated controls following 48 h of treatment. Lipopolysaccharide-elicited neutrophil recruitment was enhanced in the lungs of dexamethasone-treated calves compared to saline-treated controls. These findings indicate that modulation of epithelial antimicrobial peptide expression is one mechanism through which corticosteroids and stress may impair innate pulmonary defenses. |
| Related Links | http://dx.doi.org/10.1128/iai.00686-06 |
| Ending Page | 1334 |
| Page Count | 10 |
| Starting Page | 1325 |
| File Format | |
| ISSN | 00199567 |
| e-ISSN | 10985522 |
| Journal | Infection and Immunity |
| Issue Number | 3 |
| Volume Number | 75 |
| Language | English |
| Publisher | American Society for Microbiology |
| Publisher Date | 2007-03-01 |
| Access Restriction | Open |
| Rights Holder | American Society for Microbiology |
| Subject Keyword | Immunology Microbiology Parasitology Infectious Diseases Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Infectious Diseases Parasitology Immunology Microbiology |
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