PGE2 directly involved in inducing Treg migration.

<p>CD4+ CD25+ Tregs were enriched by magnetic column (MACS) from naïve thymus and lymph nodes (A). Treg migration was measured using media alone, cell-free supernatant collected from TM40D, TM40D-COX2, or TM40D-MB cells (B). Additionally, the role of PGE2 was assessed by anti-PGE2 blocking antibody added to TM40D-COX2 media. Purified GFP-FoxP3+ cells were isolated from spleen following CD4+ T cell enrichment (C) and analyzed for expression of the PGE2 receptors EP1, EP2, EP3, or EP4 via RT-PCR with GAPDH as a control (D). #p<0.05, *p<0.01 compared to Media alone, N = 3 samples per group.