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Retroviral transduction of peripheral blood leukocytes in a hollow-fiber bioreactor.

Abstract：

BACKGROUND:Peripheral blood white cells (leukocytes) (PBLs) have been used as effective targets for genetic manipulation by transduction with retroviruses in open systems. A semi-closed hollow-fiber bioreactor was tested for culturing and transducing lymphocytes. STUDY DESIGN AND METHODS:PBLs were isolated from five healthy donors, and 5 x 10(7) cells were cultured in hollow-fiber bioreactors for 4 days after stimulation with anti-CD3 in medium containing 200 units per mL of recombinant interleukin 2. Transduction with retroviral vector containing the gene for iduronate-2-sulfatase and G 418 resistance, L2SN, was performed daily on Days 4, 5, 6, and 7, and the cells were expanded for an additional 3 days. RESULTS:PBLs from three donors were harvested from the bioreactor after transduction and expansion, and 4.5 x 10(9), 7.0 x 10(9), and 2.9 x 10(9) cells were recovered, representing 90-, 136-, and 58-fold expansions. The transduction frequency of L2SN was 10, 5, and 1 percent, respectively. For additional expansion of PBLs, in two cases the bioreactor was reinoculated with 5 x 10(7) cells, which were expanded again for 16 and 8 days, respectively, yielding 1.4 x 10(9) and 3.1 x 10(9) cells, which reflected an additional 28- and 62-fold expansion of cells. PBLs from two other donors were transduced and expanded in the bioreactor, and then 0.8 mg per mL of G 418 was added to the medium in an attempt to enrich the transduced population. Although 2.5 and 10 percent of the cells were transduced, cell death and absence of expansion in the presence of G 418 resulted in final cell lots with viabilities of only 4 and 8 percent. In all cases, the harvested cells tested negative in bacterial and fungal cultures. CONCLUSION:Hollow-fiber bioreactors are an efficient and effective system for the retroviral transduction and expansion of PBLs for clinical gene therapy.

journal_name

Transfusion

journal_title

Transfusion

authors

Shankar R,Whitley CB,Pan D,Burger S,McCullough J,Stroncek D

doi

10.1046/j.1537-2995.1997.37797369442.x

subject

Has Abstract

pub_date

1997-07-01 00:00:00

pages

685-90

issue

eissn

0041-1132

issn

1537-2995

journal_volume

pub_type

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Retroviral transduction of peripheral blood leukocytes in a hollow-fiber bioreactor.