Modulatory Effects ofemu-let-7-5p on the Immunological Functions of RAW264.7 Macrophages.

Abstract

is a zoonotic tapeworm with great medical significance. In-infected mice, parasite-derived let-7-5p (emu-let-7-5p) is present in the sera, but its role remains unclear. Using qPCR, ELISA and flow cytometry, the immunomodulatory effects of emu-let-7-5p wereinvestigated using RAW264.7 macrophages. Compared with the control, emu-let-7-5p significantly downregulated IL-1&#x3b1; (< 0.05), but anti-inflammatory cytokine genes remained to be stably expressed in the treated macrophages. Moreover, significantly decreased expression ofand, key components in the LPS/TLR4 signaling pathway, was also observed in the emu-let-7-5p-transfected cells (< 0.05). Furthermore, CD40 was upregulated in these transfected cells (< 0.05), while CD86, CD54 and CD80 remained unchanged compared that in the control. These results demonstrate a property of emu-let-7-5p in regulation of immune functions of macrophages, making it be possibly involved in the pathogen-host interplay duringinfection.