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J Gene Med. 2010 Aug;12(8):637-46. doi: 10.1002/jgm.1478.

Modeling of congenital erythropoietic porphyria by RNA interference: a new tool for preclinical gene therapy evaluation.

Author information

1
INSERM U876, Bordeaux, France.

Abstract

BACKGROUND:

Congenital erythropoietic porphyria (CEP) is a severe autosomal recessive disorder characterized by a deficiency in uroporphyrinogen III synthase (UROS), the fourth enzyme of the heme biosynthetic pathway. We recently demonstrated the definitive cure of a murine model of CEP by lentiviral vector-mediated hematopoietic stem cell (HSC) gene therapy. In the perspective of a gene therapy clinical trial, human cellular models are required to evaluate the therapeutic potential of lentiviral vectors in UROS-deficient cells. However, the rare incidence of the disease makes difficult the availability of HSCs derived from patients.

METHODS:

RNA interference (RNAi) has been used to develop a new human model of the disease from normal cord blood HSCs. Lentivectors were developed for this purpose.

RESULTS:

We were able to down-regulate the level of human UROS in human cell lines and primary hematopoietic cells. A 97% reduction of UROS activity led to spontaneous uroporphyrin accumulation in human erythroid bone marrow cells of transplanted immune-deficient mice, recapitulating the phenotype of cells derived from patients. A strong RNAi-induced UROS inhibition allowed us to test the efficiency of different lentiviral vectors with the aim of selecting a safer vector. Restoration of UROS activity in these small hairpin RNA-transduced CD34(+) cord blood cells by therapeutic lentivectors led to a partial correction of the phenotype in vivo.

CONCLUSIONS:

The RNAi strategy is an interesting new tool for preclinical gene therapy evaluation.

PMID:
20586119
DOI:
10.1002/jgm.1478
[Indexed for MEDLINE]

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