Interleukin-33 (IL-33) is a member of the IL-1 family of cytokines that play a central role in the regulation of immune responses. IL-33 signaling, from the early signaling events triggered by the ligand-activated receptor to result in activation of early and late signaling events, such as proteome changes. In this study, THP1 (monocyte) cell line model was stimulated with IL-33 (50 ng/ml) for varying duration (5, 10, 15, 30, 40, 60, 120 and 240 mins). We carried out in-depth proteomic analysis using high-resolution LC-MS/MS. Our analysis resulted in the identification of 64,030 peptides corresponding to 7947 protein groups. Differentially regulated proteins identified in this study could be targeted for developing an inflammatory immune response.