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Interferon production by leukocytes in children with otitis media with effusion
A Pitkäranta1, T Hovi, P Karma
1Department of Otolaryngology, University of Helsinki, Finland.
Insights
Children with otitis media with effusion (OME) and no infectious history produced more interferon (IFN) than those with recurrent infections. This suggests a heterogeneous background for OME, impacting immune responses.
Area of Science:
- Immunology
- Pediatrics
- Otolaryngology
Background:
- Recurrent respiratory tract infections in children are linked to lower interferon (IFN) production.
- Otitis media with effusion (OME) is a common pediatric condition with a potentially complex etiology.
- Investigating immune markers like IFN may elucidate the pathogenesis of OME.
Purpose of the Study:
- To explore the pathogenetic background of otitis media with effusion (OME) using interferon (IFN) production as a marker.
- To compare IFN yields in leukocyte cultures from children with OME and varying infectious histories.
- To investigate potential sex-based differences in IFN responses within OME subgroups.
Main Methods:
- Analysis of leukocyte cultures from 57 children (aged 2-11 years) undergoing tympanostomy and/or adenoidectomy.
- Categorization of children into three groups: OME with recurrent acute otitis media (rAOM/OME+), OME without infectious background (inf-/OME+), and recurrent upper respiratory infections without OME (inf+/OME-).
- Stimulation of leukocyte cultures with various respiratory viruses (adenovirus, rhinovirus, coronavirus, RSV, influenza A) to measure IFN yields.
Main Results:
- Leukocyte cultures from children with OME and no infectious background (inf-/OME+) produced significantly higher IFN yields compared to the other groups.
- No significant sex differences in IFN responses were observed in the rAOM/OME+ and inf+/OME- groups.
- Leukocytes from girls in the inf-/OME+ group exhibited higher IFN production than boys in the same group, and higher than children in the other two groups.
Conclusions:
- The heterogeneous IFN production patterns suggest diverse pathogenetic pathways contributing to OME.
- Interferon production levels may serve as a valuable marker for differentiating OME subtypes.
- Findings support the hypothesis that the etiology of otitis media with effusion is multifactorial and varies between children.
Abstract:
We have previously shown that leukocyte cultures of children suffering from recurrent respiratory tract infections produce less interferon (IFN) than those of healthy children. In the present study this tentative marker of recurrent infections was used to study the pathogenetic background of otitis media with effusion (OME). Altogether 57 consecutive children, aged 2-11 years, who came for tympanostomy and/or adenoidectomy were divided into three subgroups: 25 of them had OME and a history of recurrent acute otitis media (rAOM/OME+), 20 had OME without an infectious background (inf-/OME+), and 12 had a history of recurrent upper respiratory infections (inf +/OME-) without OME. All the children were free of acute illness at the time of sampling. Differences between the groups were seen in IFN yields when leukocyte cultures were stimulated with adeno-, rhino-, corona-, respiratory syncytial or influenza A viruses. Leukocytes from inf-/OME+ children produced more IFN than those of the other two groups. Though no sex differences in the IFN responses were seen among rAOM/OME+ and inf +/OME- children, leukocytes from inf-/OME+ girls produced significantly higher amounts of IFN than those of inf-/OME+ boys, or rAOM/OME+ and inf +/OME- children. These differences between clinically different groups of children support the view that the etiology of OME can be heterogeneous.