A clinically suitable ex vivo expansion culture system for LTC-IC and CFC using stroma-conditioned medium
FACS-selected CD34+ HLA-DR- cells (DR- cells) may provide a source of benign stem cells suitable for autografting in chronic myelogenous leukemia (CML) and other hematological malignancies. However, DR- cell selection depletes the majority of committed hematopoietic progenitors, which may be importa...
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Published in | Experimental hematology Vol. 25; no. 9; p. 980 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Netherlands
01.08.1997
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Abstract | FACS-selected CD34+ HLA-DR- cells (DR- cells) may provide a source of benign stem cells suitable for autografting in chronic myelogenous leukemia (CML) and other hematological malignancies. However, DR- cell selection depletes the majority of committed hematopoietic progenitors, which may be important for early engraftment. Furthermore, only a small number of DR- cells may be selectable in certain patients. These impediments to the use of DR- cells for autografting may be overcome through the development of ex vivo culture systems that support expansion and initial differentiation of primitive progenitors. Because 2-week culture of DR- cells in a stroma "noncontact" system supplemented with interleukin-3 (IL-3) and macrophage inflammatory protein 1-alpha (MIP-1alpha) expands both long-term culture-initiating cells (LTC-ICs) and colony-forming cells (CFCs), we adapted this system to a clinically applicable method for expanding LTC-ICs and CFCs ex vivo. In initial small-scale studies, DR cells were grown in stroma conditioned medium (SCM) supplemented with IL-3 with or without additional growth-promoting cytokines and the chemokines PF-4 and BB10010, all approved for clinical use. An IL-3 dose-dependent expansion of committed progenitors and LTC-ICs was observed when DR- cells were cultured in tissue culture plates in SCM+IL-3 for 2 weeks. Similar CFC expansion along with increased (5-fold) LTC-IC expansion was observed following addition of PF-4 to SCM+IL-3 cultures. The addition of stem cell factor (SCF), but not of IL-6, IL-11, granulocyte colony-stimulating factor (G-CSF), granulocyte-macrophage (GM)-CSF, IL-1, and IL-7, increased CFC and LTC-IC expansion beyond the levels observed with SCM+IL-3 alone. We next evaluated the suitability of this culture system for scale-up. Culture of 2-6 x 10(5) DR- cells in gas-permeable bags with SCM+IL-3 resulted in similar CFC and LTC-IC expansion as seen in small-scale cultures. In addition, we observed that progenitors capable of differentiating to natural killer (NK)-cells were maintained under these conditions. Finally, we found that BCR/ABL mRNA-negative CFCs and LTC-ICs present in DR- cells selected from steady-state CML marrow could be expanded in large-scale SCM+IL-3 cultures. We conclude that culture of DR- cells for 2 weeks in SCM+IL-3 culture, with or without PF-4 or SCF, results in significant CFC and LTC-IC expansion and lymphoid NK progenitor maintenance. This culture system is readily adaptable to the expansion of primitive progenitors for autotransplantation. |
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AbstractList | FACS-selected CD34+ HLA-DR- cells (DR- cells) may provide a source of benign stem cells suitable for autografting in chronic myelogenous leukemia (CML) and other hematological malignancies. However, DR- cell selection depletes the majority of committed hematopoietic progenitors, which may be important for early engraftment. Furthermore, only a small number of DR- cells may be selectable in certain patients. These impediments to the use of DR- cells for autografting may be overcome through the development of ex vivo culture systems that support expansion and initial differentiation of primitive progenitors. Because 2-week culture of DR- cells in a stroma "noncontact" system supplemented with interleukin-3 (IL-3) and macrophage inflammatory protein 1-alpha (MIP-1alpha) expands both long-term culture-initiating cells (LTC-ICs) and colony-forming cells (CFCs), we adapted this system to a clinically applicable method for expanding LTC-ICs and CFCs ex vivo. In initial small-scale studies, DR cells were grown in stroma conditioned medium (SCM) supplemented with IL-3 with or without additional growth-promoting cytokines and the chemokines PF-4 and BB10010, all approved for clinical use. An IL-3 dose-dependent expansion of committed progenitors and LTC-ICs was observed when DR- cells were cultured in tissue culture plates in SCM+IL-3 for 2 weeks. Similar CFC expansion along with increased (5-fold) LTC-IC expansion was observed following addition of PF-4 to SCM+IL-3 cultures. The addition of stem cell factor (SCF), but not of IL-6, IL-11, granulocyte colony-stimulating factor (G-CSF), granulocyte-macrophage (GM)-CSF, IL-1, and IL-7, increased CFC and LTC-IC expansion beyond the levels observed with SCM+IL-3 alone. We next evaluated the suitability of this culture system for scale-up. Culture of 2-6 x 10(5) DR- cells in gas-permeable bags with SCM+IL-3 resulted in similar CFC and LTC-IC expansion as seen in small-scale cultures. In addition, we observed that progenitors capable of differentiating to natural killer (NK)-cells were maintained under these conditions. Finally, we found that BCR/ABL mRNA-negative CFCs and LTC-ICs present in DR- cells selected from steady-state CML marrow could be expanded in large-scale SCM+IL-3 cultures. We conclude that culture of DR- cells for 2 weeks in SCM+IL-3 culture, with or without PF-4 or SCF, results in significant CFC and LTC-IC expansion and lymphoid NK progenitor maintenance. This culture system is readily adaptable to the expansion of primitive progenitors for autotransplantation. |
Author | Miller, J S Lin, W N McGlave, P B Verfaillie, C M Bhatia, R Wissink, S |
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SubjectTerms | Bone Marrow Cells Cells, Cultured Chemokine CCL3 Chemokine CCL4 Culture Media, Conditioned Hematopoietic Stem Cells Humans Interleukin-3 - pharmacology Killer Cells, Natural Leukemia, Myelogenous, Chronic, BCR-ABL Positive Macrophage Inflammatory Proteins - pharmacology Platelet Factor 4 - pharmacology Stromal Cells - metabolism |
Title | A clinically suitable ex vivo expansion culture system for LTC-IC and CFC using stroma-conditioned medium |
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