BACKGROUND: Because there are lower incidence of graft versus host disease in HLA mismatched cord blood transplantation compared to bone marrow transplantation, development of smaller scale cord blood bank could be possible. So we analysed the content of hematopoietic stem cell in cord blood and the distribution of HLA as a basic study for cord blood bank. METHODS: Seventy eight cord bloods were collected in heparinized bottle immediately after caesarian section. After expulsion of placenta, additional cord blood and placental blood were collected with heparinized syringe. Fifteen mL was sent to the laboratory for analysis and the rest was cryopreserved. RESULTS: The mean collected cord blood volume was 96.8mL (range, 55~163mL). And mean 81.8mL (range, 40~148mL) was cryopreserved. It contained mean 7.4x108 (range, 2.8x108~12.2x108) nucleated cells. In 2x105 mononuclear cells, 85 +/- 48 BFU-E, 19 +/- 17 CFU-E, 107 +/- 73 CFU-GM and 124 +/- 113 CFU-GEMM were present. With dextran/albumin thawing media, the viability of cryopreserved cord blood mononuclear cell was better than usual washing method with IMDM (82.3% vs. 74.6% P=0.004). Each cord blood could findHLA full matched, 5 loci matched and 4 loci matched cord blood in the remainders with the probability of 0, 11.9% and 58.4%. CONCLUSION: Development of more smaller scale cord blood bank could be possible compared to bone marrow bank.
Bone Marrow ; Bone Marrow Transplantation ; Erythroid Precursor Cells ; Fetal Blood* ; Graft vs Host Disease ; Granulocyte-Macrophage Progenitor Cells ; Hematopoietic Stem Cells* ; Heparin ; Humans* ; Incidence ; Myeloid Progenitor Cells ; Placenta ; Syringes

PURPOSE: Many studies for hematopoietic stem cell have investigated CD133, instead of CD34, as a new surrogate stem cell marker. Counterflow centrifugal elutriation (CCE) is a physical separation of a homogeneous cell population through cell sedimentation characteristics. We evaluated the stem cell distribution and hematopoietic function from cord blood (CB) and bone marrow (BM) through CCE. METHODS: We obtained total nucleated cells from CB and BM, and separated the cell fractions according to media infusion flow rates (17 mL/min (FR 17), 24 mL/min (FR 24), 29 mL/min (FR 29), and rotor off (R/O) ) by CCE. We analyzed the proportion of CD34+ and CD133+ cells in each fraction, and performed methylcellulose-based colony assay. RESULTS: In CB, the cell recovery rates after CCE were 5.9+/-4.3% in FR 17, 4.2+/-2.1% in FR 24, 19.4+/-11.9% in FR 29, and 61.9+/-11.7% in R/O. In BM, they were 14.9+/-8.2% in FR 17, 17.4+/-13.4% in FR 24, 23.6+/-6.11% in FR 29, and 27.1+/-8.9% in R/O. The distributions of CD133+ and CD34+ cells in CB were more abundant in R/O (2.91%, 1.85%) than in other fractions. In BM, CD133+ and CD34+ cell rates in R/O (5.40%, 2.75%) were similar with those in unmanipulated BM (5.48%, 2.78%). In both CB and BM, there was more CFU-GM and BFU-E in R/O than in other fractions. CONCLUSION: We suggested that the distribution of CD34+ and CD133+ cells might be different between CB and BM. However, the R/O containing relatively large cells could have an effective clonogenicity compared with the unmanipulated sample in both CB and BM.
Bone Marrow* ; Erythroid Precursor Cells ; Fetal Blood* ; Granulocyte-Macrophage Progenitor Cells ; Hematopoietic Stem Cells ; Stem Cells

Clinical evidence of hematopoietic restoration with umbilical cord blood (UCB) grafts indicates the UCB can be a useful source of hematopoietic stem cells for routine bone marrow reconstitution. Considering (10 +/- 5) x 10(8) nucleared cells per cord blood unit, there is a potential limitation for the use of cord blood in adults, which, however, can be overcome by ex vivo expansion of cells. A prerequisite for expansion is the significantly higher recovery of MNC, CD34+ cells and colony-forming cells (CFC) by thawing cryopreserved MNC. Cooling rate always acts as a critical factor that can affect the recovery of cells. Although the rate of - 1 degrees C/min is adopted in most of the cryopreservations, no data has been reported about the detailed effects of different cooling rates. The aim of the study was to reveal the different effects of cooling rates on cryopreservation of hematopoietic stem cells from cord blood. UCB samples were collected, and cryopreserved as mononuclear cells (MNC) with different cooling rates of - 0.5 degrees C/min, - 1 degrees C/min, - 5 degrees C/min, and the recovery and viability of MNC and CD34+ cells, the clonogenic capacity and the ex vivo expansion potential of UCB progenitor cells were evaluated after thawing. With - 1 degrees C/min cooling rate, the recovery of MNC reached 93.3% +/- 1.8% , viability 95.0% +/- 3.9% , recovery of CD34+ cells 80.0% +/- 17.9% , and clonogenic recovery were 87.1% +/- 5.5%, 88.5% +/- 8.9%, 86.2% +/- 7.4% for BFU-E CFU-GM CFU-MK, respectively. After 14 days of liquid culture, no significant difference was detected in CFC expansion between fresh and cryopreserved MNC cells with - 1 degrees C/min cooling rate, but this was not the case with - 0.5 degreesC/min and - 5 degrees C/min. In conclusion, it was demonstrated that controlling the rate at - 1 degrees C/min is more suitable for cryopreservation of hematopoietic stem cells than - 0.5 degrees C/min and - 5 degrees C/min.
Cell Survival ; physiology ; Cells, Cultured ; Cryopreservation ; methods ; Erythroid Precursor Cells ; cytology ; Fetal Blood ; cytology ; Flow Cytometry ; Granulocyte-Macrophage Progenitor Cells ; cytology ; Hematopoietic Stem Cells ; cytology ; Humans

BACKGROUND: During ex vivo expansion of cord blood (CB) CD34+ cells, differentiation of the expanded cells happened and hematopoietic potential of the progenitor cells decreased. In this study, we evaluate the effect of the expression of Fas antigen, Bcl-2, and Bax on CD34+ or AC133+ hematopoietic progenitor cells during ex vivo expansion. METHODS: CD34+ and AC133+ cells isolated from human CB were cultured in serum free medium supplemented with several cytokines for 7 days. After expansion culture, we re isolated CD34+ and AC133+ cells and compared the numbers of granulocyte-macrophage colony-forming units (CFU-GM) and granulocyte, erythrocyte, monocyte, and macrophage colony-forming units (CFU-GEMM), and expression of Fas antigen, Bcl-2, and Bax with unexpanded cells. RESULTS: CFU-GM was expanded 23.94 fold in CD34+ cells and 15.22 fold in AC133+ cells at day 7 of culture but CFU-GEMM was not expanded. The expression of Fas antigen and Bax was 7.44% and 2.75%, respectively, in fresh isolated CD34+ cells and increased to 19.71 % and 33.67%, respectively, in expanded CD34+ cells at day 7 culture, but Bcl-2 was not changed. In case of AC133+ cells, the expression of Fas antigen and Bax were also increased from 5.87% and 6.19% to 24.85% and 22.83%, respectively, and Bcl-2 was slightly decreased. Apoptosis was not changed in CD34+ cells and AC133+ cells during ex vivo expansion. CONCLUSION: These results indicate that the nature of expansion was similar between CD34+ and AC133+ cells, and expression of Fas antigen and Bax increased on CD34+ and AC133+ cells during ex vivo expansion. Selection of the expanded progenitor cells without apoptosis may be useful for the hematopoietic stem cell transplantation.
Antigens, CD95* ; Apoptosis* ; Cytokines ; Erythrocytes ; Fetal Blood ; Granulocyte-Macrophage Progenitor Cells ; Granulocytes ; Hematopoietic Stem Cell Transplantation ; Hematopoietic Stem Cells* ; Humans ; Macrophages ; Monocytes ; Myeloid Progenitor Cells ; Stem Cells

BACKGROUND AND OBJECTIVELeukemic microenvironment has a major role in the progression of leukemia. Leukemic cells can induce reversible changes in microenvironmental components, especially the stromal function which results in improved growth conditions for maintaining the malignant leukemic cells. This study aimed to investigate the survival advantage of leukemic cells over normal hematopoietic cells in stromal microenvironment in long term.

METHODSThe mice were injected intraperitoneally with N-N' ethylnitrosourea (ENU) to induce leukemia; the mice received injection of normal saline were used as control. At 180 days after ENU induction, the mice were killed and the bone marrows were cultured for 19 days. Colony-forming assays were used to analyze the formation of various cell colonies. The expression of Sca-1, CD146, VEGFR2, CD95, pStat3, pStat5, and Bcl-xL in marrow cells were detected by flow cytometry.

RESULTSLong-term leukemic bone marrow culture showed abnormal elongated stromal fibroblasts with almost absence of normal hematopoietic cells. Adherent cell colonies were increased, but CFU-F and other hematopoietic cell colonies were significantly decreased in leukemia group (P<0.001). Primitive progenitor-specific Sca-1 receptor expression was decreased with subsequent increased expression of CD146 and VEGFR-2 in leukemic bone marrow cells. Decreased Fas antigen expression with increased intracellular pStat3, pStat5 and Bcl-xL proteins were observed in leukemic bone marrow cells.

CONCLUSIONSStromal microenvironment shows altered morphology and decreased maturation in leukemia. Effective progenitor cells are decreased in leukemia with increased leukemia-specific cell population. Leukemic microenvironment plays a role in promoting and maintaining the leukemic cell proliferation and survivability in long term.

Animals ; Antigens, Ly ; metabolism ; Bone Marrow Cells ; metabolism ; pathology ; CD146 Antigen ; metabolism ; Cell Count ; Cells, Cultured ; Colony-Forming Units Assay ; Erythroid Precursor Cells ; metabolism ; pathology ; Ethylnitrosourea ; Female ; Fibroblasts ; metabolism ; pathology ; Granulocyte-Macrophage Progenitor Cells ; metabolism ; pathology ; Granulocytes ; metabolism ; pathology ; Hematopoiesis ; Hematopoietic Stem Cells ; metabolism ; pathology ; Leukemia ; chemically induced ; metabolism ; pathology ; Male ; Membrane Proteins ; metabolism ; Mice ; Myeloid Progenitor Cells ; metabolism ; pathology ; Phenotype ; STAT3 Transcription Factor ; metabolism ; STAT5 Transcription Factor ; metabolism ; Tumor Microenvironment ; physiology ; Vascular Endothelial Growth Factor Receptor-2 ; metabolism ; bcl-X Protein ; metabolism ; fas Receptor ; metabolism

BACKGROUND: Classically, bone marrow (BM) has been the sole source of hematopoietic stem cell transplantation, but limitations of conventional bone marrow transplantation have stimulated a search for alternative sources of stem cells. METHODS: We compared hematopoietic stem cell activity of normal bone marrow (BM), in vivo G-CSF-stimulated bone marrow (G-CSF BM), and G-CSF-mobilized peripheral blood (G-CSF PB) by immunophenotyping, clonogeneicity, and long-term culture-initiating cell (LTC-IC) analysis. RESLUTS: The average numbers of CD34+/HLA-DR- cells after CD34+ cells isolation from each stem cell source were 59.64 +/- 8.70%, 91.39 +/- 1.98%, and 95.75 +/- 2.08% in normal BM, G-CSF BM, and G-CSF PB, respectively (normal BM vs. G-CSF BM, normal BM vs. G-CSF PB, p<0.0001). And the average numbers of CD34+/CD38- cells were 66.23 +/- 9.33%, 95.08+/- 2.09%, and 91.76 +/- 4.59% in normal BM, G-CSF BM, and G-CSF PB, respectively (normal BM vs. G-CSF BM, normal BM vs. G-CSF PB, p<0.0001). The numbers of CFU-GM was significantly higher in G-CSF PB (53.2 +/- 4.05) and G-CSF BM (52.5 +/- 3.63) than that of normal BM (31.3+/- 5.50) (p<0.0001). Also the numbers of CFU-GEMM and CFU-Mk were also significantly higher in G-CSF PB (110.3 +/- 8.79 and 13.3 +/- 1.49) and G-CSF BM (109.7 +/- 10.78 and 11.2 +/- 1.69) than that of normal BM (48.8 +/- 1.48 and 8.5 +/- 1.72) (p<0.05). Comparison of LTC-IC in the three sources of stem cells showed that G-CSF PB and G-CSF BM were superior to normal BM at five weeks of culture (p<0.05). CONCLUSIONS: These data suggest that the amount of both early progenitor cells and late progenitor cells in G-CSF PB and G-CSF BM are higher than that of normal BM. And our results further support that the higher stem cell transplantation using G-CSF-mobilized PB and in vivo G-CSF-stimulated BM can lead to more rapid and sustained engraftment even in cases of high risk of rejection.
Bone Marrow Transplantation ; Bone Marrow* ; Granulocyte Colony-Stimulating Factor* ; Granulocyte-Macrophage Progenitor Cells ; Hematopoietic Stem Cell Transplantation ; Hematopoietic Stem Cells* ; Immunophenotyping ; Myeloid Progenitor Cells ; Stem Cell Transplantation ; Stem Cells

PURPOSE: Umbilical cord blood transplantation is a alternative method as new hematopoietic stem cell transplantation and has been performed clinically in indicated disease. However, it have the problems for long-term storage of cord blood in liquid nitrogen and for limited application to adult due to small amount of hematopoietic stem cell. Therefore, several centers have carried out active research for ex vivo expansion of cord blood stem cell. We investigated the hematopoietic function of cord blood plasma for development of new techniques. METHODS: We acquired the nucleated cells of cord blood from healthy infant and bone marrow from healthy donor received granulocyte-colony stimulating factor. We evaluated hematopoietic colony formation according to source of stem cell and plasma by semisolid culture medium. Three experimental groups were divided as source of plasma: group for cord plasma, group for bone marrow plasma, group for mixture of cord plasma and bone marrow plasma. RESULTS: The results were as follows: 1) The colony formation according to source of stem cell in commercialized standard semisolid culture medium showed that cord blood in the number of CFU-GM was less than bone marrow, but not significantly different in CFU-GEMM. 2) The colony formation according to source of stem cell in semisolid culture medium using experimental plasma showed that cord blood in the number of CFU-GM was more than bone marrow. There were no cytotoxic effect of plasma to experimental cells. 3) The colony formation in semisolid culture medium contained plasma according to experimental group showed that the number of CFU-GM in cord blood plasma was significantly more than bone marrow plasma in spite of different source of stem cell. Conclusions: These results suggested that cord blood might contain enough hematopoiesis to enable to perform transplantation compared with bone marrow and, also, cord blood plasma might be contributed more effective colony formation than bone marrow plasma. Therefore, we propose that it may be good to store cord blood cells with cord blood plasma in long-term storage. We will investigate the composition of hematopoietic growth factors and cytokines in cord blood plasma and the effect of cord blood plasma for ex vivo expansion of cord blood cells.
Adult ; Bone Marrow ; Bone Marrow Cells ; Cytokines ; Fetal Blood* ; Granulocyte-Macrophage Progenitor Cells ; Hematopoiesis ; Hematopoietic Stem Cell Transplantation ; Hematopoietic Stem Cells ; Humans ; Infant ; Intercellular Signaling Peptides and Proteins ; Myeloid Progenitor Cells ; Nitrogen ; Plasma* ; Stem Cells ; Tissue Donors

OBJECTIVETo investigate the effects of oxygen concentration and reactive oxygen species (ROS) on the biological characteristics of hematopoietic stem cells (HSC) and to analyzed the relationship among the oxygen concentration, ROS and the biological characteristics of mouse HSC through simulation of oxygen environment experienced by PB HSC during transplantation.

METHODSThe detection of reactive oxygen species (ROS), in vitro amplification, directional differentiation (BFU-E, CFU-GM, CFU-Mix), homing of adhesion molecules (CXCR4, CD44, VLA4, VLA5, P-selectin), migration rate, CFU-S of NOD/SCID mice irradiated with sublethal dose were performed to study the effect of oxgen concentration and reactive oxygen species on the biological characteristics of mouse BM-HSC and the relationship among them.

RESULTSThe oxygen concentrations lower than normal oxygen concentration (especially hypoxic oxygen environment) could reduce ROS level and amplify more Lin(-) c-kit(+) Sca-1(+) BM HSC, which was more helpful to the growth of various colonies (BFU-E, CFU-GM, CFU-Mix) and to maintain the migratory ability of HSC, thus promoting CFU-S growth significantly after the transplantation of HSC in NOD/SCID mice irradiated by a sublethal dose. BM HSC exposed to oxygen environments of normal, inconstant oxygen level and strenuously thanging of oxygen concentration could result in higher level of ROS, at the same time, the above-mentioned features and functional indicators were relatively lower.

CONCLUSIONThe ROS levels of BM HSC in PB HSCT are closely related to the concentrations and stability of oxygen surrounding the cells. High oxygen concentration results in an high level of ROS, which is not helpful to maintain the biological characteristics of BM HSC. Before transplantation and in vitro amplification, the application of antioxidancs and constant oxygen level environments may be beneficial for transplantation of BMMSC.

Animals ; Cell Differentiation ; Culture Media ; chemistry ; Erythroid Precursor Cells ; cytology ; Granulocyte-Macrophage Progenitor Cells ; cytology ; Hematopoietic Stem Cells ; cytology ; metabolism ; Mice ; Mice, Inbred NOD ; Mice, SCID ; Oxygen ; chemistry ; Reactive Oxygen Species ; metabolism

Hematopoiesis involves a series of lineage differentiation programs initiated in hematopoietic stem cells (HSCs) found in bone marrow (BM). To ensure lifelong hematopoiesis, various molecular mechanisms are needed to maintain the HSC pool. CCCTC-binding factor (CTCF) is a DNA-binding, zinc-finger protein that regulates the expression of its target gene by organizing higher order chromatin structures. Currently, the role of CTCF in controlling HSC homeostasis is unknown. Using a tamoxifen-inducible CTCF conditional knockout mouse system, we aimed to determine whether CTCF regulates the homeostatic maintenance of HSCs. In adult mice, acute systemic CTCF ablation led to severe BM failure and the rapid shrinkage of multiple c-Kit(hi) progenitor populations, including Sca-1⁺ HSCs. Similarly, hematopoietic system-confined CTCF depletion caused an acute loss of HSCs and highly increased mortality. Mixed BM chimeras reconstituted with supporting BM demonstrated that CTCF deficiency-mediated HSC depletion has both cell-extrinsic and cell-intrinsic effects. Although c-Kit(hi) myeloid progenitor cell populations were severely reduced after ablating Ctcf, c-Kit(int) common lymphoid progenitors and their progenies were less affected by the lack of CTCF. Whole-transcriptome microarray and cell cycle analyses indicated that CTCF deficiency results in the enhanced expression of the cell cycle-promoting program, and that CTCF-depleted HSCs express higher levels of reactive oxygen species (ROS). Importantly, in vivo treatment with an antioxidant partially rescued c-Kit(hi) cell populations and their quiescence. Altogether, our results suggest that CTCF is indispensable for maintaining adult HSC pools, likely by regulating ROS-dependent HSC quiescence.
Adult ; Animals ; Bone Marrow ; Cell Cycle ; Chimera ; Chromatin ; Fibrinogen* ; Hematopoiesis ; Hematopoietic Stem Cells* ; Homeostasis ; Humans ; Lymphoid Progenitor Cells ; Mice* ; Mice, Knockout ; Mortality ; Myeloid Progenitor Cells ; Reactive Oxygen Species

No abstract available.
Hematopoietic Stem Cells