TY - JOUR
T1 - Neutrophil maturation of CD34+ cells from peripheral blood and bone marrow in serum-free culture medium with PIXY321 and granulocyte-colony stimulating factor (G-CSF)
AU - Smith, S. L.
AU - Bender, J. G.
AU - Berger, C.
AU - Lee, W. J.
AU - Loudovaris, M.
AU - Martinson, J. A.
AU - Opotowsky, J. D.
AU - Qiao, X.
AU - Schneidkraut, M.
AU - Sweeney, P.
AU - Unverzagt, K. L.
AU - Van Epps, D. E.
AU - Williams, D. E.
AU - Williams, S. F.
AU - Zimmerman, T. M.
PY - 1997/8
Y1 - 1997/8
N2 - Bone marrow (BM) or peripheral blood (PB) CD34+ cells were cultured for 12 days in serum-free culture medium containing PIXY321 (IL-3/ GM-CSF fusion protein) with or without periodic supplements of granulocyte-colony stimulating factor (G-CSF). The cultures were evaluated at day 12 for total cell proliferation (fold increase from day 0), neutrophil differentiation by flow cytometry, using dual staining with CD15-FITC and CD11b-PE, and morphology using Wright-Giemsa and granule staining. In cultures containing PIXY321 where 6000 U/ml of G-CSF was added on days 0 and 6, there was no significant difference (p ≤ 0.05) in cell proliferation or the percent of CD15+/CD11b+ cells when compared with cultures with PIXY321 alone. ELISA analysis showed G-CSF levels had declined by 90% after 3 days of culture. Further studies were performed to assess the benefit of supplementing lower concentrations of G-CSF (600 U/ml) at more frequent intervals. A significant increase (p ≤ 0.05) in cell proliferation and percent CD15+/CD11b+ was observed when G-CSF was added on days 0, 3, 6, and 9 (every 3 days) as compared with those cultures with PIXY321 alone. CD34+ cell proliferation without G-CSF was 19.6 ± 4.8-fold, with G-CSF added on days 0 and 6 was 28.7 ± 6.4-fold, and with G-CSF added on days 0, 3, 6, and 9 was 45.9 ± 10.6-fold. Percent of CD15+/CD11b+ cells was 19.0 ± 4.6%, 38.2 ± 7.3%, and 58.5 ± 6.5%, respectively, in these cultures. We observed more CD15+/CD11b+ cells, myelocytes/metamyelocytes, and secondary granule staining in cultures with G-CSF added on day, 0, 3, 6, and 9 as compared with cultures with G-CSF added on days 0 and 6 or no G-CSF added. We conclude that PIXY321 and G-CSF act synergistically on the in vitro proliferation and neutrophil differentiation of BM and PB CD34+ cells and that frequent supplements of G-CSF facilitate neutrophil differentiation.
AB - Bone marrow (BM) or peripheral blood (PB) CD34+ cells were cultured for 12 days in serum-free culture medium containing PIXY321 (IL-3/ GM-CSF fusion protein) with or without periodic supplements of granulocyte-colony stimulating factor (G-CSF). The cultures were evaluated at day 12 for total cell proliferation (fold increase from day 0), neutrophil differentiation by flow cytometry, using dual staining with CD15-FITC and CD11b-PE, and morphology using Wright-Giemsa and granule staining. In cultures containing PIXY321 where 6000 U/ml of G-CSF was added on days 0 and 6, there was no significant difference (p ≤ 0.05) in cell proliferation or the percent of CD15+/CD11b+ cells when compared with cultures with PIXY321 alone. ELISA analysis showed G-CSF levels had declined by 90% after 3 days of culture. Further studies were performed to assess the benefit of supplementing lower concentrations of G-CSF (600 U/ml) at more frequent intervals. A significant increase (p ≤ 0.05) in cell proliferation and percent CD15+/CD11b+ was observed when G-CSF was added on days 0, 3, 6, and 9 (every 3 days) as compared with those cultures with PIXY321 alone. CD34+ cell proliferation without G-CSF was 19.6 ± 4.8-fold, with G-CSF added on days 0 and 6 was 28.7 ± 6.4-fold, and with G-CSF added on days 0, 3, 6, and 9 was 45.9 ± 10.6-fold. Percent of CD15+/CD11b+ cells was 19.0 ± 4.6%, 38.2 ± 7.3%, and 58.5 ± 6.5%, respectively, in these cultures. We observed more CD15+/CD11b+ cells, myelocytes/metamyelocytes, and secondary granule staining in cultures with G-CSF added on day, 0, 3, 6, and 9 as compared with cultures with G-CSF added on days 0 and 6 or no G-CSF added. We conclude that PIXY321 and G-CSF act synergistically on the in vitro proliferation and neutrophil differentiation of BM and PB CD34+ cells and that frequent supplements of G-CSF facilitate neutrophil differentiation.
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U2 - 10.1089/scd.1.1997.6.323
DO - 10.1089/scd.1.1997.6.323
M3 - Article
C2 - 9377071
AN - SCOPUS:0030833274
SN - 1525-8165
VL - 6
SP - 323
EP - 334
JO - Journal of Hematotherapy and Stem Cell Research
JF - Journal of Hematotherapy and Stem Cell Research
IS - 4
ER -