Cytokine Levels and Clinical Characteristics in the Tear Fluid of Patients with Atopic Dermatitis and Atopic Keratoconjunctivitis

To investigate the relationship between the cytokine levels in the tear fluid and the severity of ocular surface disease in patients with atopic dermatitis (AD) and atopic keratoconjunctivitis (AKC). Tear fluid was collected from 104 AD patients with stratified AKC severity and the healthy controls, who all underwent ophthalmological examination. Cytokine levels in tear fluid were analyzed with Luminex multiplex assays. Increased levels of eotaxin-3, IFN-β, IFN-γ, IL-1β, IL-13, IL-15, IL-17A, IL-2, IL-4, IL-6, IL-8, MCP-4, MIP-1α, MIP-1β, MMP-9, MPIF-1 and MPO were observed in moderate-severe AKC group and IL-6, IL-8 and IFN-γ was associated with AKC severity. The participants with AKC had higher frequencies of atopic comorbidities and the severity of AD was associated with more severe AKC. AKC severity was associated with AD severity, more atopic comorbidities, and increased levels of tear fluid cytokines associated with Th1, -2 and -3 immune response. • Increased levels of Th1, Th2, and Th17 cytokines in the tear fluid of AKC patients. • IL-6, IL-8 and IFN-γ levels in the tear fluid are associated with AKC severity. • AKC severity is associated with AD severity. • AKC is associated with atopic comorbidities such as asthma and rhinitis.