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We found a significant overlap between the two data sets (P?[https://en.wikipedia.org/wiki/Dabigatran Dabigatran] IAR. We combined ChIP-chip, gene expression microarrays, computational predictions, and siRNA knockdowns. Chromatin immunoprecipitation chip technology has not previously been used in allergy research, and we also developed novel computational methods to interpret the data. We focused on IRF4, which has an important role in regulating Th2 cells and other T cells but has not been examined in human allergy. [http://www.selleckchem.com/products/Bortezomib.html Bortezomib in vivo] We found that IRF4 regulated almost 400 genes. This number is similar to that found in a study of IRF4-induced genes in myeloma cells (29). The genes found in our study were involved in several different pathways, of which the most significant included T helper cell differentiation and T-cell receptor signaling. Interferon regulatory factor 4 also regulated pathways related to cellular proliferation, metabolism, and DNA methylation. This indicates that IRF4 has an important role in activating transcriptional programs that integrate immune responses with general cellular activation processes. However, neither Th1 nor Th2 cytokines were the direct targets of IRF4. This suggested that IRF4 interacted with other TFs to regulate these cytokines. Indeed, the IRF4-induced genes included several TFs previously described to regulate Th2 cytokines, namely ETS1, [http://www.selleckchem.com/products/AZD6244.html selleckchem] GATA3, HIF1A, MAF, MYB, RORA, and STAT5B (15�C22). Another TF, PRDM1, inhibited Th1, while STAT4 is an important Th1 cell activator. Of these TFs, only GATA3 has previously been described as IRF4 regulated. The increase in STAT4 does not agree with the paradigm that Th1 cells have a counter-regulatory role in allergy. This novel finding could, however, explain recent studies reporting concurrent increases in Th1 and Th2 cytokines in allergic inflammation (14, 25, 26, 30, 31). Limitations of the study include that gene expression microarrays do not detect low-abundance genes and that poorly annotated genes may not be included in the pathway analysis. Chromatin immunoprecipitation chip technology detects TF bound to the promoter regions, but such TF do not necessarily regulate transcription. To identify genes that were regulated by IRF4, we combined RNA polymerase II ChIP-chip and gene expression microarrays.