scholarly journals Detection And ex vivo Expansion Of Dormant Anti-Viral CTL Precursors Isolated From Recipients Of Unrelated Umbilical Cord Blood Transplant (UCBT)

2010 ◽  
Vol 16 (2) ◽  
pp. S167-S168
Author(s):  
L.C. Marti ◽  
A.M. Leen ◽  
S. Janetzki ◽  
J.H. Baker ◽  
P. Szabolcs
Keyword(s):  
Cord Blood ◽  
Umbilical Cord ◽  
Umbilical Cord Blood ◽  
Ex Vivo ◽  
Ex Vivo Expansion ◽  
Cord Blood Transplant

Augmentation of umbilical cord blood (UCB) transplantation with ex vivo–expanded UCB cells: results of a phase 1 trial using the AastromReplicell System

Blood ◽  
2003 ◽  
Vol 101 (12) ◽  
pp. 5061-5067 ◽  
Author(s):  
Jennifer Jaroscak ◽  
Kristin Goltry ◽  
Alan Smith ◽  
Barbara Waters-Pick ◽  
Paul L. Martin ◽  
...  
Keyword(s):  
Cord Blood ◽  
Umbilical Cord ◽  
Umbilical Cord Blood ◽  
Ex Vivo ◽  
Phase 1 ◽  
Horse Serum ◽  
Perfusion Culture ◽  
Ex Vivo Expansion ◽  
Hematopoietic Stem ◽  
Phase 1 Trial

AbstractAllogeneic stem cell transplantation with umbilical cord blood (UCB) cells is limited by the cell dose a single unit provides recipients. Ex vivo expansion is one strategy to increase the number of cells available for transplantation. Aastrom Biosciences developed an automated continuous perfusion culture device for expansion of hematopoietic stem cells (HSCs). Cells are expanded in media supplemented with fetal bovine serum, horse serum, PIXY321, flt-3 ligand, and erythropoietin. We performed a phase 1 trial augmenting conventional UCB transplants with ex vivo–expanded cells. The 28 patients were enrolled on the trial between October 8, 1997 and September 30, 1998. UCB cells were expanded in the device, then administered as a boost to the conventional graft on posttransplantation day 12. While expansion of total cells and colony-forming units (CFUs) occurred in all cases, the magnitude of expansion varied considerably. The median fold increase was 2.4 (range, 1.0-8.5) in nucleated cells, 82 (range, 4.6-266.4) in CFU granulocyte-macrophages, and 0.5 (range, 0.09-2.45) in CD34+ lineage negative (lin–) cells. CD3+ cells did not expand under these conditions. Clinical-scale ex vivo expansion of UCB is feasible, and the administration of ex vivo–expanded cells is well tolerated. Augmentation of UCB transplants with ex vivo–expanded cells did not alter the time to myeloid, erythroid, or platelet engraftment in 21 evaluable patients. Recipients of ex vivo–expanded cells continue to have durable engraftment with a median follow-up of 47 months (range, 41-51 months). A randomized phase 2 study will determine whether augmenting UCB transplants with ex vivo–expanded UCB cells is beneficial.

Large Ex Vivo Expansion of Human Umbilical Cord Blood CD4+ and CD8+ T Cells

1999 ◽  
Vol 8 (2) ◽  
pp. 129-139 ◽  
Author(s):  
Danna Skea ◽  
Nan-Hua Chang ◽  
Robin Hedge ◽  
Barbara Dabek ◽  
Truman Wong ◽  
...  
Keyword(s):  
T Cells ◽  
Cord Blood ◽  
Umbilical Cord ◽  
Cd8 T Cells ◽  
Umbilical Cord Blood ◽  
Ex Vivo ◽  
Ex Vivo Expansion ◽  
Human Umbilical Cord Blood ◽  
Human Umbilical Cord

scholarly journals Ex Vivo Expansion of Human Umbilical Cord Blood-Derived T-Lymphocytes with Homologous Cord Blood Plasma

2005 ◽  
Vol 205 (2) ◽  
pp. 115-122 ◽  
Author(s):  
Yong-Man Kim ◽  
Min-Hyung Jung ◽  
Ha-Young Song ◽  
Hyun Ok Yang ◽  
Sung-Tae Lee ◽  
...  
Keyword(s):  
T Lymphocytes ◽  
Blood Plasma ◽  
Cord Blood ◽  
Umbilical Cord ◽  
Umbilical Cord Blood ◽  
Ex Vivo ◽  
Ex Vivo Expansion ◽  
Human Umbilical Cord Blood ◽  
Human Umbilical Cord

Ex vivo expansion of CD34+ and T and NK cells from umbilical cord blood for leukemic BALB/C nude mouse transplantation

2008 ◽  
Vol 87 (2) ◽  
pp. 217-224 ◽  
Author(s):  
Yaming Wei ◽  
Yinfeng Huang ◽  
Yinze Zhang ◽  
Huayou Zhou ◽  
Qiong Cao ◽  
...  
Keyword(s):  
Cord Blood ◽  
Nk Cells ◽  
Nude Mouse ◽  
Umbilical Cord ◽  
Umbilical Cord Blood ◽  
Ex Vivo ◽  
Ex Vivo Expansion

Ex Vivo Expansion of Umbilical Cord Blood T Cells for Adoptive Immunotherapy.

Blood ◽  
2005 ◽  
Vol 106 (11) ◽  
pp. 35-35
Author(s):  
Melissa A. Mazur ◽  
Young Ah Lee ◽  
Kurtzberg Joanne ◽  
Szabolcs Paul
Keyword(s):  
T Cells ◽  
T Cell ◽  
Cord Blood ◽  
Umbilical Cord ◽  
Umbilical Cord Blood ◽  
Adoptive Immunotherapy ◽  
Ex Vivo ◽  
Cell Activity ◽  
Ex Vivo Expansion ◽  
Hla Dr

Abstract Background: Viral infections cause significant morbidity & mortality in patients undergoing unrelated allogeneic BMT transplantation before immune reconstitution is completed. It poses a greater risk for recipients of unrelated umbilical cord blood (uUCB) transplants as there is no established antiviral immunity in naïve UCB lymphocytes available for adoptive transfer. UCB T cells also lack Th1/Tc1 cytokines, Granzymes & Perforin which are prerequisites to control viral pathogens. Another major limitation of uUCBT is the lack of donor cells available for post-transplant donor leukocyte infusions (DLI) to boost immunity or induce GVL. However, a fraction of the uCB graft could be available for T cell expansion. In this study we evaluated the feasibility of ex vivo expansion of UCB T cells. We postulated that following expansion naïve T cells may mature & acquire a phenotype compatible with effector function as assessed by expression of essential cytokines & de novo expression of members of the granzyme-perforin pathway. Methods: Thawed UBC research samples with a leukocyte content <5% of an average UCB graft are processed. T cells are enriched with “EasySep” (StemCell Tech) to deplete CD14, CD16, CD19, CD56, & glycophorin A + cells. 5–7.5*105 T cells/ml are incubated with “CD3/28 T cell Expander” artificial APC beads (Dynal) in X Vivo-15 (BioWhittacker) + 200u/ml IL2 & 10% human serum in gas permeable bags. The initial purity of the T cells is 77–92%. The starting absolute T cell numbers ranged from 0.75 to 2*106 cells. Media & cytokines are added every other day to maintain a concentration of <2*106 cells/ml. Results: At the end of 14 days UCB T Cells expanded 67 fold +/− 36, n=6. There are significant alterations in phenotype over the 2 weeks (Table 1) with up to 40% of T cells in cell cycle. Compared to the starting resting UCB T cells the majority of expanded cells have acquired the phenotype of activated (HLA-DR+, CD25+ T cells) memory cells, at the expense of naive/recent thymic immigrants (CD45RA+/CD62+). There is an inverted CD4/CD8 ratio due to the higher expansion rate of CD8 T cells (p=0.0035) while there is no difference in apoptosis (p=0.57). However, they all retain expression of CD28 (96% ±8%) along with CD27. Although some T cells have acquired the capacity to secrete granzymes A and B these are still almost a log below normal adult peripheral blood (PB) values & perforin has not been detected. Similarly, while post expansion significantly more T cells secrete cytokines upon PMA + ionomycin stimulation (Table 1) they are below levels of adult PB. Conclusions: From our preliminary results we can demonstrate effective expansion & partial maturation of UCB T Cells. For example, if one starts with 2*106 total T cells & expands them 67 fold this could provide for DLI ~5*106 T cells/kg for an average pediatric patient (25kg). We are further optimizing & characterizing this model for T cell activity & repertoire. In sum, ex vivo expansion with CD3/CD28 co-stimulation may provide clinically relevant numbers T cells available for adoptive immunotherapy that have also undergone partial maturation. Characterization of Expanded T Cells as % of all Lymphocytes Variable Median SD CD3+ 99.8 0.1 CD4+ 35 11 CD4+/CD8+ 2.3 2.8 CD45RA+/RO− 13 11 CD45RO+/RA− 55 22 CD25+ 42 21 CD45RA+/CD62+ 38 20 CD45RA+/CD27+/CD8+ 52 15 CD45RA−/CD27+/CD8+ 46 15 KI67/CD8+ 42 9 Ki67/CD4+ 32 7 HLA DR+ 40 13 Granzyme A/CD8+ 54 18 Granzyme B/CD8+ 2 2 Perforin/CD8+ 0 0

Study of In Vitro Proliferation Potential of CD133 Positive Cells Derived from Umbilical Cord Blood.

Blood ◽  
2007 ◽  
Vol 110 (11) ◽  
pp. 4039-4039
Author(s):  
Ri Zhang ◽  
Wenjin Gao ◽  
Yuanyuan Sun ◽  
Jingcheng Miao ◽  
Xueguang Zhang
Keyword(s):  
Cord Blood ◽  
Progenitor Cells ◽  
Umbilical Cord ◽  
Umbilical Cord Blood ◽  
Ex Vivo ◽  
Ex Vivo Expansion ◽  
Hematopoietic Stem ◽  
Low Concentration ◽  
Tgf Β1

Abstract Transforming growth factor-beta 1 (TGF-β1) is known to maintain primitive human hematopoietic stem/progenitor cells with polyfunctional role in a quiescent state and CD133 is a new stem cell antigen that may provide an alternative to CD34 for the selection and expansion of hematopoietic cells for transplantation. To investigate the specific effect of TGF-β1 on proliferation and differentiation of CD133 positive cells derived from umbilical cord blood (UCB) during short-term culture in vitro, CD133 positive cells from 20 fresh UCB samples were selected using Miltenyi Biotec’s CliniMACS separation device and were cultured in IMDM medium with 20% FCS in the presence of a cytokine combination of SCF, IL-6, thrombopoietin, IL-3 and Flt3-ligand for up to 2 weeks and TGF-β1 with low concentration was also added to the mediumon day 4. The proliferative response was assessed at day 7, day 10 and day 14 by evaluating the following parameters: nucleated cells (NC), clonogenic progenitors (CFU-GEMM,CFU-GM and BFU-E), and immunophenotypes (CD133 and CD34). The results showed that efficacious expansion of various hematopoietic stem/progenitor cells was constantly observed during the culture. The fold expansion of NC on day7, day10 and day14 expansion were 33.59,224.26 and 613.48, respectively. The fold expansion of CFU-GEMM, CFU-GM and BFU-E on day 10 were 24.89, 41.62 and 49.28, respectively, obviously higher than that without ex vivo expansion (P<0.05). The expansions of CD133+, CD133+CD34+ and CD34+ subpopulation on day 14 were up to 25.83-fold, 16.16-fold and 60.54-fold, respectively. Furthermore the expansion systems with TGF-β1 showed more CD133+ cells than control at every time points. Our datas suggested that the CD133+ cells from human UCB have great expansion potential for ex-vivo expansion. The low concentration of TGF-β1 may delay over-differentiation of hematopoietic stem/progenitor cells.

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