Interleukin-1β is a positive regulator of TIARP/STAMP2 in 3T3-L1 adipocytes

Tumor necrosis factor alpha-induced adipose-related protein (TIARP)/six-transmembrane protein of prostate 2 (STAMP2) has been characterized as an adipocyte-expressed protein which might play a crucial role in metabolic homeostasis and inflammatory pathways. In the current study, the impact of insulin resistance-inducing and proinflammatory interleukin (IL)-1β on TIARP/STAMP2 gene expression was determined by quantitative real-time reverse transcription-polymerase chain reaction in 3T3-L1 adipocytes. Interestingly, TIARP/STAMP2 mRNA synthesis was significantly stimulated by IL-1β in a dose-dependent fashion with 2.6-fold induction seen at IL-1β concentrations as low as 0.02ng/ml and maximal 9.2-fold upregulation found at 20ng/ml effector. Furthermore, induction of TIARP/STAMP2 mRNA by IL-1β was time-dependent with maximal 18.6-fold upregulation detectable after 8h of IL-1β treatment. Signaling studies suggested that janus kinase 2, nuclear factor κ B, and p44/42 mitogen-activated protein kinase are involved in IL-1β-induced TIARP/STAMP2 mRNA expression. Taken together, these results show that TIARP/STAMP2 is highly upregulated in fat cells by IL-1β and might participate in proinflammatory and insulin resistance-inducing effects of this cytokine.