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Blood, 1 August 2005, Vol. 106, No. 3, pp. 893-898. Prepublished online as a Blood First Edition Paper on April 21, 2005; DOI 10.1182/blood-2004-07-2859.
Submitted July 26, 2004
Department of Internal Medicine I, Albert-Ludwigs-University, Freiburg, Germany; Institute of Molecular Medicine and Cell Research, Albert-Ludwigs-University, Freiburg, Germany * Corresponding author; email: ceaves{at}bccrc.ca.
Short term hematopoietic reconstituting cells have been identified in mice, non-human primates and amongst human cells that engraft xenogeneic hosts. We now present clonal marking data demonstrating a rapid but unsustained contribution of cultured human autografts to the initial phase of hematologic recovery in myeloablated patients. Three patients were transplanted with granulocyte colony-stimulating factor-mobilized autologous peripheral blood (PB) cells, of which a portion (8-25% of the CD34+ cells) had been incubated in vitro with growth factors (5 days) and clinical grade LN-retrovirus (3-5 days). More than 9% of the clonogenic and longterm culture-initiating cells harvested were transduced. Semi-quantitative and linear amplification-mediated PCR analyses of serial PB samples showed that marked WBCs appeared in all 3 patients within 11 days and transiently constituted up to 0.1-1% of those produced in the first month. However, within another 2-9 months, marked cells had permanently decreased to very low levels. Analysis of >50 vector insertion sites showed none of the clones detected in the first month were active later. 80% of inserts were located within or near genes, 2 near CXCR4. These findings provide direct evidence of cells with rapid but transient repopulating activity in patients and demonstrate their efficient transduction in vitro.
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