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- W2078357707 abstract "Objectives To analyze whether complement C3a anaphylatoxin, other C3 fragments, interleukin-1β (IL-1β), or tumor necrosis factor-α (TNF-α) contributes to inflammation in chronic otitis media with effusion (OME). Methods The amount of C3a was measured by enzyme-linked immunoassay. Further breakdown of C3 was analyzed by Western blotting. IL-1β and TNF-α concentrations were measured by radioimmunoassay. Bacteria were analyzed by culture and polymerase chain reaction. Results Highly elevated levels of C3a and other C3 cleavage fragments were found in all middle ear effusion (MEE) samples. The mean values (± SEM, n = 26) for C3a, IL-1β, and TNF-α were 5973 ± 1124 ng/mL, 1043 ± 490 pg/mL, and 79 ± 14.3 pg/mL, respectively. Comparison to an average C3 level of 555 (±108) μg/mL indicated that at least 40.5% ± 6% of total C3 had become activated within the MEE. C3a concentrations were higher in the group in which the effusion had been present in the middle ear for a prolonged period (≥4 mo) (P = .04). Children with multiple tube insertions had higher C3 (P = .006) and TNF-α (P = .04) concentrations in their MEE samples than those receiving their first tubes. C3 and C3a concentrations in MEE correlated to each other (correlation coefficient [r] = 0.513, P = .0056), as did concentrations of IL-1β and TNF-α (r = 0.7016, P < .0001). No significant correlation was found between complement C3 or C3a levels and IL-1β, TNF-α, or bacterial growth. Conclusions Highly elevated levels of C3a in MEE indicate ongoing complement activation, which is stronger than in almost any other disease demonstrated previously. Elevated C3a levels contribute to chemotactic and inflammatory potential in the MEE and correlate with the chronicity of the disease." @default.
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- W2078357707 date "2000-10-01" @default.
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- W2078357707 title "Complement C3 Cleavage and Cytokines Interleukin-1?? and Tumor Necrosis Factor-?? in Otitis Media With Effusion" @default.
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- W2078357707 doi "https://doi.org/10.1097/00005537-200010000-00035" @default.
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