Human interleukin - 4 complementory DNA (hlL - cDNA) was amplified from a hlL -4 cDNA - positive plasmid
PCD - hIL - 4 by PCR. Sequence analysis showed no mutation occured and the open reading frame was included in the fragmcnt. Human hIL - 4 cDNA was inserted into polylinker site of retroviral vector
in which the transcription of hlL - 4 cDNA drived by 5’LTR promotcr. The recombinant retrovirals was pakaged in PA317 cell line and used to infect human HL - 60
k 562 and Raji cell linc in presence of 4ug/ml polybrene. retroJranscriptimal PCR analysis abowed hlL - 4 cDNA was trancripted in modified tumor cells and the maxrnium of IL-4 level secreted by modified tumor cells obtained 300pg/10 cell - 24h.The results suggested that hlL - 4 cDNA could be expressed efficiently under the control of vector’s promoter.