CD4+ T cells are key players in host defense against pathogens, but an incorrect balance between CD4+ T cell subsets, namely pro-inflammatory effector cells, including T helper 1 (Th)1 and Th17 cells (IFN-γ- and IL-17-producers, respectively), and anti-inflammatory regulatory cells (Treg; Foxp3+ subset), can lead to immune-mediated diseases. MicroRNAs (miRNAs) are small non-coding RNAs that negatively regulate ...