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  • Title: [Myeloperoxidase (MPO) as a marker of neutrophil influx into nasal mucosa after recombinant IL-8 challenge].
    Author: Kupczyk M, Bocheńska-Marciniak M, Górski P, Kuna P.
    Journal: Pneumonol Alergol Pol; 2002; 70(11-12):544-9. PubMed ID: 12884563.
    Abstract:
    Myeloperoxidase (MPO) has been proposed to mirror the degree of neutrophil activation, however its role as a marker of the participation of neutrophils in allergic inflammation is still unclear as the literature is controversial. The aim of this study was to evaluate the MPO levels and neutrophil influx in nasal lavage after recombinant Il-8 challenge. Eight patients suffering from seasonal allergic rhinitis, hypersensitive to grass pollens, with average age 30.1 +/- 2.67 were challenged both with Il-8 and diluent for Il-8 on a subsequent day, in two phases: before the pollen season (unprimed mucosa) and during the season (primed mucosa). Nasal lavage with saline were collected before, during Il-8 or placebo challenge and 30 minutes, 2 hours and 3 hours after the challenge. The number of neutrophils and MPO levels in the nasal fluid were determined. After the challenge with Il-8 of primed mucosa the number of neutrophils increased from 28250 cells/ml at the baseline to 28778, 251020 and 333660 at 0, 5, 2 and 3 hours respectively. There was a statistically significant difference between cells number after diluent and Il-8 challenge (p < 0.05, Wilcoxon rank-sum test). The number of neutrophils in the nasal lavage of primed mucosa after Il-8 challenge was significantly higher (p < 0.005) at all time points in comparison with the diluent and Il-8 challenges in the unprimed mucosa. There was no difference (p < 0.05) in MPO levels in the nasal lavage between Il-8 (mean 17.43 ng/ml +/- 10.98) and diluent challenge (20.98 ng/ml +/- 11.89) of unprimed mucosa. In the primed mucosa fluid we observed a peak of MPO level at 2 hours time point, however that was not significant as compared to diluent challenge (p = 0.465). We did not find the relationship between MPO levels and the neutrophils number in the lavage (rank Spearman factor, rs = 0.258, p = 0.42). Due to the lack of statistically confirmed relationship between MPO level and the number of neutrophils, MPO seems to be of little value as a marker of neutrophil influx into nasal mucosa.
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