Influence of C-159T SNP of the CD14 gene promoter on lung function in smokers |
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Authors: | Haibo Zhou Neil E Alexis Martha Almond James Donohue Craig LaForce Philip A Bromberg David B Peden |
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Institution: | 1. The Center for Environmental Medicine, Asthma and Lung Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA;2. Department of Pediatrics, The School of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA;3. Department of Medicine, The School of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA;4. Department of Biostatistics, The Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA;5. North Carolina Clinical Research, Raleigh, NC, USA |
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Abstract: | CD14, a co-receptor for endotoxin, plays a significant role in regulating the inflammatory response to this agent. The C-159T single nucleotide polymorphism (SNP) in the CD14 gene promoter is an important regulator of CD14 expression, with TT homozygotes having increased expression of CD14. This SNP has been linked to pathogenesis of asthma and with cardiovascular diseases in smokers. We hypothesize that CD14 also plays a role in the pathophysiology of COPD in smokers who are exposed to endotoxin contained in cigarette smoke as well as endotoxin derived from Gram-negative microbes colonizing their airways. To assess the effect of the C-159T SNP of the CD14 gene promoter on lung function, we recruited 246 smokers 40 years of age or older with a range of 10–156 pack-year smoking exposures. The TT genotype was associated with lower lung function in smokers with a moderate smoking history. However, the CC genotype was associated with decreased lung function in heavy smokers (>56 pack years). The effect of CC genotype on severity of COPD is analogous with the effect of this genotype in risk for asthma. CD14 may be a factor in the pathophysiology of COPD, as it is in asthma and smoking-related cardiovascular diseases. |
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Keywords: | COPD Gene-environment interaction Endotoxin Smoking CD14 |
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