Platelet-activating factor receptor (PAFr) is upregulated in small airways and alveoli of smokers and COPD patients.
Respirology
; 21(3): 504-10, 2016 Apr.
Article
em En
| MEDLINE
| ID: mdl-26662379
ABSTRACT
BACKGROUND AND OBJECTIVE:
PAFr is a cell adhesion site for specific bacteria, notably non-typeable Haemophilus influenzae (NTHi) and Streptococcus pneumoniae. We previously published that PAFr expression is significantly upregulated in the large airways of smokers, especially in COPD. We have now investigated PAFr expression in the epithelium and Rbm of small airways and in the alveolar compartment in smokers and patients with both COPD and small airway disease.METHODS:
We evaluated PAFr expression cross-sectionally in resected lung tissue from eight smokers with normal lung function (NLFS); 10 with smoking-related small airway narrowing only; eight COPD smokers; 10 COPD ex-smokers, and compared these with nine control tissues. Anti-PAFr immunostaining was quantified using computer-aided image analysis.RESULTS:
Significantly increased PAFr expression in small airway epithelium of all clinical groups was found compared with controls (P < 0.01). Moreover, epithelial PAFr expression was upregulated in COPD smokers compared with NLFS (P < 0.05), but not when compared with COPD ex-smokers or patients with only small airways disease. Smoking history (pack-year) correlated significantly with PAFr expression in the currently smoking individuals, especially in NLFS (r = 0.9; P < 0.002). An increase above normal in PAFr-expressing cells in the airway epithelial Rbm was only significant in COPD smokers (P < 0.007). An upregulation of PAFr-expressing cell in alveolar epithelium was uniformly found in all clinical groups compared with normal control (P < 0.01).CONCLUSION:
Epithelial PAFr expression is upregulated in small airways and alveoli in smokers and COPD. Increased expression of PAFr could be crucial in facilitating acute and chronic respiratory infection with specific respiratory pathogens.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Alvéolos Pulmonares
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Plaquetas
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Glicoproteínas da Membrana de Plaquetas
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Fumar
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Regulação para Cima
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Regulação da Expressão Gênica
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Doença Pulmonar Obstrutiva Crônica
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Receptores Acoplados a Proteínas G
Limite:
Adult
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Aged
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Aged80
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
Respirology
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Austrália