Abstract:
:Chronic granulomatous disease (CGD) can result from any of four single gene defects involving the components of the superoxide (O-2) generating phagocyte nicotinamide adenine dinucleotide phosphate (NADPH) oxidase. We show that transduction of peripheral blood CD34+ hematopoietic progenitors from a p67phox deficient CGD patient with replication defective amphotropic retrovirus encoding p67phox (MFGS-p67phox) significantly corrected the CGD functional defect in phagocyte oxidase activity in vitro. Using a chemiluminescence assay of oxidase activity, we showed that transduced patient CD34+ progenitors differentiating to myeloid cells in culture produced 25% of the total superoxide produced by normal CD34+ progenitors differentiating in culture. A flow cytometric assay of oxidase activity used to assess the oxidase function of individual cells in the cultures indicated that up to 32% of maturing granulocytes derived from transduced CD34+ progenitors from the p67phox CGD patient were oxidase positive with the average level of correction per granulocyte of 85% of that seen with granulocytes in similar cultures of CD34+ progenitors from normal volunteers. Nitroblue tetrazolium dye reduction assays of colonies of transduced progenitors in soft agar indicated that in some studies restoration of oxidase activity occurred in myeloid cells within 44% of granulocyte-erythrocyte-monocyte colonies, and within 28% of the combined group of granulocyte colonies/monocyte colonies/granulocyte monocyte colonies. These high correction rates were achieved without any selective regimen to enrich for transduced cells. This study provides a basis for development of gene therapy for the p67phox deficient form of CGD.
journal_name
Bloodjournal_title
Bloodauthors
Weil WM,Linton GF,Whiting-Theobald N,Vowells SJ,Rafferty SP,Li F,Malech HLsubject
Has Abstractpub_date
1997-03-01 00:00:00pages
1754-61issue
5eissn
0006-4971issn
1528-0020journal_volume
89pub_type
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