Investigation of let-7 family expression in CD4+ T cells induced by anti-CD2, CD3, CD28 and Interleukin-2 and identifying their potential targets

Aime and The aim of this study was to evaluate let-7 family members expression in activated naïve CD4+ T cells and IL-2 induced cells. Let-7 family has oncogenic and tuomor suppressive activity in different cells. Naïve CD4+ T cells were activated by anti-CD2، CD3، CD28 microbeads. After 3 days، the activated cells stimulated by IL-2 (0. 75ng/ml). after 72h total RNA extracted the cells and c-DNA synthesis and Q-RT-PCR performed by miRCURY LNATM universal RT miRNA PCR kit. miRNA expression analyzed by geneX software and ∆∆Ct method. Five members of let-7 family over-expressed in activated cells compared with IL-2 induced cells. Targets Predicted by miRDB and miRanda software including families of DUSP، PTPN and SOCS that two first families inhibit TCR signaling and latest suppress JAK/STAT pathway. It appears that let-7 family play important role in clonal expansion of activated CD4+ T cells by specific genes suppression in post-transcriptional levels for appropriated immune response.