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Prepublished online as a Blood First Edition Paper on June 26, 2003; DOI 10.1182/blood-2002-05-1482.

Submitted May 21, 2002
Accepted June 9, 2003
Concentrated RD114-pseudotyped MFGS-gp91phox vector achieves high levels of functional correction of the chronic granulomatous disease oxidase defect in NOD/SCID/ 2m -/- repopulating mobilized human peripheral blood CD34+ cells
Sebastian Brenner*, Narda L Whiting-Theobald, Gilda F Linton, Kevin L Holmes, Mindy Anderson-Cohen, Patrick F Kelly, Elio F Vanin, Andre M Pilon, David M Bodine, Mitchell E Horwitz, and Harry L Malech
Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA; Department of Pediatrics, University Clinic 'Carl Gustav Carus', TU Dresden, Dresden, Germany
Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
Division of Experimental Hematology, Children's Hospital Medical Center, Cincinnati, OH, USA
Department of Hematology/Oncology, Division of Experimental Hematology, St. Jude Children's Research Hospital, Memphis, TN, USA
Genetics and Molecular Biology Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
* Corresponding author; email: sbrenner{at}nih.gov.
In previous studies amphotropic MFGS-gp91phox (murine onco-retrovirus vector) was used in a clinical trial of X-linked chronic granulomatous disease (X-CGD) gene therapy to achieve transient correction of oxidase activity in 0.1% of neutrophils. We later showed that transduced CD34+ peripheral blood stem cells (CD34+PBSC) from this trial transplanted into NOD/SCID mice resulted in correction of only 2.5% of human neutrophils. However, higher rates of transduction into stem cells are required. In the current study we demonstrate that the same vector (MFGS-gp91phox) pseudotyped with RD114 envelope in a 4-day culture/transduction regimen results in a 7-fold increase in correction of NOD/SCID mouse repopulating X-CGD CD34+PBSC (14-22% corrected human neutrophils; human cell engraftment 13-67%). This may result from high expression of receptor for RD114 that we demonstrate on CD34+CD38- stem cells. Using RD114-MFGS encoding cyan fluorescent protein to allow similar studies of normal CD34+PBSC, we show that progressively higher levels of gene marking of human neutrophils (67-77%) can be achieved by prolongation of culture/transduction to 6 days, but with lower rates of human cell engraftment. Our data demonstrate the highest reported level of functional correction of any inherited metabolic disorder in human cells in vivo with the NOD/SCID mouse system using onco-retrovirus vector.

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