Abstract
We have proposed a novel concept, ie selective expansion of transduced cells, to overcome the low efficiency of gene transfer into hematopoietic stem cells. Previously, a fusion gene encoding a chimeric receptor (ΔGCRER) between the mouse granulocyte colony-stimulating factor receptor (G-CSFR) and the hormone-binding domain of rat estrogen receptor was constructed as a ‘selective amplifier gene’. Although the chimeric gene conferred estrogen-inducible proliferation on the transduced Ba/F3 cells, it also mediated differentiation of the retrovirally transduced 32D cells upon estrogen treatment. Since only a growth signal is required for our purpose, we further modified the ΔGCRER gene to attenuate its differentiation signal. Based on the observation that tyrosine-703 in wild-type G-CSFR plays a pivotal role in transmitting the differentiation signal, phenylalanine was substituted for this residue in ΔGCRER. When the resultant selective amplifier gene (ΔY703F-GCRER gene) was expressed in 32D cells, sustained growth was supported by estrogen, while differentiation was suppressed. These cells ceased to grow upon estrogen withdrawal and differentiated with G-CSF treatment. The present findings suggested that ΔY703F-GCRER may have desirable properties as a selective amplifier for hematopoietic stem cell expansion and gene therapy.
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Acknowledgements
We thank Dr JM Cunningham, Dr T Suda and Chugai Pharmaceuticals for research materials, and Dr A Okano for IL-3 titration. This work was supported in part by grants from the Ministry of Health and Welfare of Japan and Grants-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan.
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Matsuda, K., Kume, A., Ueda, Y. et al. Development of a modified selective amplifier gene for hematopoietic stem cell gene therapy. Gene Ther 6, 1038–1044 (1999). https://doi.org/10.1038/sj.gt.3300906
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DOI: https://doi.org/10.1038/sj.gt.3300906
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