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. 1992 Apr 15;89(8):3227–3231. doi: 10.1073/pnas.89.8.3227

Retroviral-mediated transfer of the human acid sphingomyelinase cDNA: correction of the metabolic defect in cultured Niemann-Pick disease cells.

M Suchi 1, T Dinur 1, R J Desnick 1, S Gatt 1, L Pereira 1, E Gilboa 1, E H Schuchman 1
PMCID: PMC48839  PMID: 1565614

Abstract

Types A and B Niemann-Pick disease (NPD) result from inherited deficiencies of the lysosomal hydrolase, acid sphingomyelinase (ASM; sphingomyelin cholinephosphohydrolase, EC 3.1.4.12). To evaluate the feasibility of somatic gene therapy for the treatment of these disorders, retroviral-mediated gene transfer was used to introduce the full-length ASM cDNA into cultured fibroblasts from two unrelated type A NPD patients. The ASM activities in these cells were less than 4% of mean normal levels, and, consequently, they accumulated approximately 3-fold elevated levels of sphingomyelin. After retroviral-mediated transfer of the ASM cDNA, ASM activities in the NPD cells increased to levels up to 16-fold those found in normal fibroblasts. In addition, the sphingomyelin content was reduced to normal levels, indicating that the vector-encoded enzyme was properly targeted to lysosomes, where it was enzymatically active and able to degrade the accumulated substrate. In situ cell-loading studies also were undertaken to evaluate the effects of retroviral-mediated gene transfer on the pathology of NPD fibroblasts. When a pyrene derivative of sphingomyelin was introduced into the lysosomes of cultured fibroblasts from a type A NPD patient by using apolipoprotein E-mediated endocytosis, only approximately 6% of the delivered substrate was degraded. In contrast, normal cells and NPD cells transduced (i.e., "corrected") by retroviral-mediated gene transfer could degrade approximately 80% of the delivered sphingomyelin. These results provided further evidence that retroviral-mediated gene transfer may be used to correct the pathology of NPD cells. Cell-loading studies were also used to develop a selection system for discriminating between NPD cells and those transduced by retroviral-mediated gene transfer. This selection scheme was based on the fluorescence emission of intact NPD cells, which, when loaded with pyrene-labeled sphingomyelin, was 3- to 5-fold that of normal or transduced cells. As a consequence, the NPD and transduced cells could be efficiently sorted by flow cytometry with a fluorescence-activated cell sorter. In addition, the NPD cells could be selectively killed by photosensitization after irradiation with a long-wavelength UV light. These results should permit direct selection of ASM-expressing cells after retroviral-mediated gene transfer without the need to preselect for a cotransferred marker gene.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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