This subproject is one of many research subprojects utilizing theresources provided by a Center grant funded by NIH/NCRR. The subproject andinvestigator (PI) may have received primary funding from another NIH source,and thus could be represented in other CRISP entries. The institution listed isfor the Center, which is not necessarily the institution for the investigator.Otitis media (OM), the most common pediatric disease, is recognized to be multifactorial, with complex genetic, environmental and infectious etiologies. Acute otitis media (AOM) usually occurs as a bacterial complication of viral upper respiratory tract infection (URI) in children. Evidence suggests that different types of viruses vary in their ability to induce AOM. The proposed study will investigate the relationship between 'host' and 'microbe' in the development of virus-induced AOM. We will explore the pathogenicity of specific respiratory viruses, and the role of proinflammatory cytokines (TNFa, IL-1b, IL-6) and their gene regulation in the mechanisms of virus-induced AOM. We will study differential cytokine expression in virus-induced AOM in vivo and in vitro. We will prospectively follow 210 infants and children, with and without polymorphisms of acute phase cytokine genes (TNFa-308, IL-1b+3953, and IL- 6-174 alleles) for one year. For 3 weeks after each viral URI episode, we will monitor for the occurrence of AOM. We will compare virus type and cytokine concentrations in respiratory secretions from children who do and who do not develop AOM as a complication. Risk for AOM development will be evaluated for association with cytokine genotypes. The study will help clarify the role of specific respiratory viruses, proinflammatory cytokines, and their gene regulation in the pathogenetic mechanisms of virus-induced AOM.
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