IL‐10 increases the number of CFU–GM generatedby ex vivo expansion of unmanipulated human MNCsand selected CD34+ cells

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Abstract
BACKGROUND: Ex vivo expansion strategies with different cytokine combinations are currently used by several groups as a means of increasing the number of HPCs for a variety of special clinical applications. Because there is little information on the potential role of IL‐10 in such ex vivo expansion models, the effect of this cytokine on the generation of myeloid progenitor cells in suspension cultures was investigated.STUDY DESIGN AND METHODS: On the basis of data from the literature and from new experiments, the combination of SCF and IL‐3 at concentrations of 100 ng per mL and 100 U per mL, respectively, was chosen as the standard cocktail. The addition of IL‐10 to such cultures resulted in a marked and dose‐dependent potentiation of myeloid progenitor cell production.RESULTS: Using unmanipulated leukapheresis components from 13 individuals (including lymphoma and cancer patients and normal donors), the expansion multiple of CFU–GM after 14 days as compared with pre‐expansion values was 9.54 ± 2.31 times by SCF/IL‐3 and 46.38 ± 7.37 times by the combination of SCF/IL‐3 and 100 ng per mL of IL‐10 (pCONCLUSION: These results suggest IL‐10 as a useful cytokine to optimize progenitor cell‐expansion strategies for clinical application.

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