The present invention provides immunomodulators for enhancing
RNA expression, improving
RNA stability, and / or prolonging
RNA expression time. The invention provides a composition and application thereof. The composition comprises one or more immunomodulatory factors or active variants thereof, wherein the immunomodulatory factors are selected from the group consisting of ORF6, M
protein, A46R, SOCS1, SOCS2, SOCS3, NSP5, NS5A, VP35, NS4b, tat, DHX58, B18R, V
protein, VP3 and NS1; or a
polynucleotide encoding the same; or a vector comprising a
polynucleotide encoding the same.