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Cytokine serum profiles in allergic and non-allergic asthma. Increased production of IL-10 by non-allergic asthmatic patients.

Studies were undertaken to determine whether differences in serum cytokine balances could be involved in the pathogenesis of allergic and in non-allergic asthma. At this propose, interferon-gamma, tumor necrosis factor-alpha, interleukin-2, interleukin-4, interleukin-6, and interleukin-10 were measured by enzimoimmunoassay. The analysis was performed on 24 allergic and 24 non-allergic asthmatic patients and 16 healthy subjects. IFN-gamma and TNF-alpha, included into the type 1 cytokines, appeared significantly increased in the allergic with respect to the non-allergic asthmatic patients (p = 0.01) and (p < 0.001) respectively, while IL-10, which belongs to the type 2 cytokines, was significantly increased in the non-allergic asthmatic (p < 0.001). The IL-6 analysis did not show any significant difference in either of the study group. The most interesting finding was the high serum IL-10 values detected in intrinsic asthmatic patients, which in turn, suggests that this cytokine could participate in the regulation of different immunological features that occurs in non-allergic asthma, and maybe it could indicate a higher stimulated state of cells in this type of asthma. The data presented in this report show a different cytokine profile in serum from allergic and non-allergic asthmatic patients and denote a stronger prevalence of type 2 cytokines in intrinsic asthma.