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. 1988 Sep;85(18):6851–6855. doi: 10.1073/pnas.85.18.6851

Design of vectors for efficient expression of human purine nucleoside phosphorylase in skin fibroblasts from enzyme-deficient humans.

W R Osborne 1, A D Miller 1
PMCID: PMC282076  PMID: 3137573

Abstract

Purine nucleoside phosphorylase (PNP; purine-nucleoside orthophosphate ribosyltransferase, EC 2.4.2.1) deficiency is an inherited disorder associated with a severe immune defect that is fatal. Enzyme replacement therapy is an attractive approach to treatment of this disease. To this aim we constructed retroviral vectors containing a human PNP cDNA and a selectable gene encoding neomycin phosphotransferase. PNP expression was controlled by either the early promoter from simian virus 40, the immediate early promoter from human cytomegalovirus, or the retroviral promoter. Cultured skin fibroblasts from two unrelated PNP-deficient patients that were infected with these vectors expressed mean PNP activities of 0.03, 0.74, and 5.9 mumol/hr per mg of protein, respectively. The latter infectants had PNP activities eight times the level of 0.74 mumol/hr per mg of protein observed in normal skin fibroblasts, enabling rapid metabolism of exogenous deoxyguanosine, the cytotoxic metabolite that accumulates in the plasma of PNP-deficient patients. These experiments indicate that viral long terminal repeat was the strongest promoter for expression of PNP and suggest the potential of human skin fibroblasts as vehicles for therapeutic gene expression.

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Selected References

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