CCL2 and dry eye syndrome: In the dry eye group, the initial concentrations of IL-1β, IL-6, IL-8, MCP-1, TNF-α and IFN-γ were 57.78 ± 5.25, 214.73 ± 18.17, 500.30 ± 38.69, 1518.42 ± 143.29, 385.11 ± 21.95, and 96.55 ± 8.19 pg/ml, respectively.