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Durham, NC, United States

Tracy E.T.,Duke University | Zhang C.Y.,Duke University | Gentry T.,Aldagen Inc. | Shoulars K.W.,Duke University | Kurtzberg J.,Duke University
Cytotherapy | Year: 2011

Background aims. Oligodendrocyte precursor cells (OPC) hold promise as a cellular therapy for demyelinating diseases. The feasibility of using OPC-based therapies in humans depends upon a reliable, readily available source. We have previously described the isolation, expansion and characterization of oligodendrocyte-like cells from fresh human umbilical cord blood (UCB). We now describe the isolation and expansion of OPC from thawed, cryopreserved UCB. Methods. We thawed cryopreserved UCB units employing a standard clinical protocol, then isolated and plated mononuclear cells under previously established culture conditions. All OPC cultures were trypsinized at 21 days, counted, then characterized by flow cytometry after fixation, permeablization and labeling with the following antibodies: anti-oligodendrocyte marker 4 (O4), anti-oligodendrocyte marker 1 (O1) and anti-myelin basic protein (MBP). OPC were also placed in co-culture with shiverer mouse neuronal cells then stained in situ for beta tubulin III (BT3) and MBP as a functional assay of myelination. Results. The average OPC yield per cryopreserved UCB unit was 64% of that seen with fresh UCB. On flow cytometric analysis, 74% of thawed UCB units yielded cells with an O4-expression level of at least 20% of total events, compared with 95% of fresh UCB units. We observed myelination of shiverer neurons in our functional assay, which could be used as a potency assay for release of OPC cells in phase I human clinical trials. Conclusions. Our results demonstrate that OPC can be derived reliably from thawed, cryopreserved UCB units, and support the feasibility of using these cells in human clinical trials. © 2011 Informa Healthcare. Source

Tracy E.T.,Duke University | Haas K.M.,Wake forest University | Gentry T.,Aldagen Inc. | Danko M.,Duke University | And 3 more authors.
Journal of Pediatric Surgery | Year: 2011

Purpose: The mechanism by which partial splenectomy preserves splenic immune function is unknown. Immunoglobulin (Ig) M memory B cells are critical for the immune response against encapsulated bacteria and are reduced in asplenic patients, although it is unknown whether partial splenectomy can preserve memory B cells. We hypothesized that IgM memory B cells (murine B-1a cells) would be preserved after partial splenectomy but not after total splenectomy in mice. Methods: We performed total splenectomy (n = 17), partial splenectomy (n = 10), or sham laparotomy (n = 16) on C57BL/6J mice. Mice were killed on postoperative day 10 or 30, and peritoneal washings were analyzed by multiparameter flow cytometry for expression of murine B-1a cells (IgM posIgD dullCD5 posB220 dull). Results: We found that B-1a cells were significantly reduced after both total and partial splenectomies compared with sham laparotomy in the early postoperative period, although normal levels of B-1a cells returned by postoperative day 30 in mice undergoing partial splenectomy but not total splenectomy. Conclusion: Partial splenectomy but not total splenectomy preserves the B-1a B-cell population in mice within 30 days after surgery. Maintenance of these critical B cells may contribute to the preservation of a splenic-dependent immune response after partial splenectomy. © 2011 Elsevier Inc. Source

Aldagen Inc. | Date: 2010-12-13

The present invention relates to populations of stem cells, methods for isolating these stem cell populations, and methods repairing, regenerating, and reconstituting tissues using the these stem cell populations. The invention additionally relates to methods of screening agents that promote growth, engraftment, or differentiation of stem cells.

Aldagen Inc. | Date: 2016-03-16

Diagnostic reagents for clinical or medical laboratory use.

Aldagen Inc. and StemCo Biomedical | Date: 2005-05-10

Human and animal hematopoietic stem cells and reagents for scientific, laboratory or medical research.

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