Abstract
Introduction of DNA into human hemopoietic cells is required for the study of regulatory mechanisms operating in these cells, as well as for possible procedures of gene therapy. However, with hemopoietic cells the conventional technique of calcium phosphate precipitation is inefficient. The pathway of encapsidation of plasmid DNA as simian virus 40 (SV40) pseudovirions for the introduction of new genetic material was therefore investigated. Encapsidation was achieved in COS (monkey kidney) cells, which express SV40 large tumor (T) antigen constitutively. The vector, pSO, was introduced to the COS cells by DNA transfection. It carried the SV40 origin of replication (ori), to facilitate replication of the plasmid in the COS cells. The SV40 capsid proteins were supplied in trans by a helper SV40 virus. The bacterial chloramphenicol acetyltransferase gene cat was used as a model for gene transmission. After encapsidation, the pseudovirions were used in infection of the human erythroleukemic cell line K562 and of normal human bone marrow cells. The results demonstrate that the cat gene can be transmitted with high efficiency. Over 40% of the infected K562 cells and 30% of the infected bone marrow cells were observed to contain plasmid DNA 48 hr after infection. Moreover, the results suggest that the efficiency of gene transmission by this vector can be improved and so may approach the theoretical 100%.
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