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LPS-ligation to CD14/TLR-4 on monocytes/macrophages triggers the production of IL-12-family cytokines. IL12/18 promote TH 1 -differentiation, counteracting the TH 2 -driven asthma. Therefore, CD14 modulation could alter the TH 2 -differentiation and should be taken into account when studying asthma. To analyse the alteration in CD14 levels and its association with  CD14  (−159 C/T) SNP (rs2569190) in Caucasian adults with stable allergic asthma, we performed a cross-sectional study (277 healthy subjects vs. 277 patients) where clinical parameters, CD14 values and the  CD14  (−159 C/T) SNP were studied. Apart from typical biomarkers, we found an increment of neuron-specific enolase (NSE) in allergic asthma, probably linked to monocyte activity. Indeed, we evidenced increased monocyte numbers, but lower CD14 expression and normalised sCD14 values in patients. Moreover, we noticed an association of the T allele ( P  = 0.0162) and TT genotype ( P  = 0.0196) of the  CD14  SNP with a decreased risk of allergic asthma and augmented sCD14 levels. In conclusion, monocyte CD14 expression and normalized sCD14 values were reduced in stable state asthmatics, and this could be related to the presence of an expanded CD14 low  monocyte subset. This study also demonstrates that the  CD14  (−159 C/T) polymorphism is a risk factor for moderate-severe allergic asthma in adult Caucasians.

The CD14 (−159 C/T) SNP is associated with sCD14 levels and allergic asthma, but not with CD14 expression on monocytes