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TRANSPLANTATION
From the "Cristina Gandini" Bone Marrow
Transplantation Unit, Istituto Nazionale Tumori, Milano, Italy; and
Chair of Oncology, University of Milano, Milano, Italy.
CD2+ T lymphocytes obtained from either the donor of
bone marrow stromal cells (BMSCs) or a third party were cultured in
mixed lymphocyte reactions (MLRs) with either allogeneic dendritic
cells (DCs) or peripheral blood lymphocytes (PBLs). When autologous or
allogeneic BMSCs were added back to T cells stimulated by DCs or PBLs,
a significant and dose-dependent reduction of T-cell proliferation,
ranging from 60% ± 5% to 98% ± 1%, was evident. Similarly,
addition of BMSCs to T cells stimulated by polyclonal activators
resulted in a 65% ± 5% (P = .0001) suppression of
proliferation. BMSC- induced T-cell suppression was still evident
when BMSCs were added in culture as late as 5 days after starting of
MLRs. BMSC-inhibited T lymphocytes were not apoptotic and efficiently proliferated on restimulation. BMSCs significantly suppressed both
CD4+ and CD8+ T cells (65% ± 5%,
[P = .0005] and 75% ± 15%
[P = .0005], respectively). Transwell experiments, in
which cell-cell contact between BMSCs and effector cells was prevented,
resulted in a significant inhibition of T-lymphocyte proliferation,
suggesting that soluble factors were involved in this phenomenon. By
using neutralizing monoclonal antibodies, transforming growth factor
Bone marrow is a complex tissue containing
hematopoietic stem and progenitor cells and their progeny in close
contact with a connective tissue network of stromal cells constituting
the bone marrow microenvironment.1 Bone marrow stromal
cells (BMSCs) comprise a multifunctional tissue consisting of
heterogeneous cell populations that provide a specialized
microenvironment for controlling the process of
hematopoiesis.2
BMSC progenitors can be readily isolated from bone marrow and expanded
ex vivo without any apparent modification in phenotype or loss of
function.3 Purified and culture-expanded human stromal stem cells differentiate along the osteogenic, chondrogenic, myogenic, and adipogenic lineages both in vitro4-8 and in
vivo.9,10 BMSCs constitutively secrete regulatory
molecules and cytokines that stimulate and enhance the proliferation of
hematopoietic stem/progenitor cells.11
When reinfused in nonhuman models, ex vivo-expanded BMSCs migrate
to and become incorporated into several tissues of the recipient animals where BMSCs are capable to elicit tissue-specific
differentiation programs indicating that, similarly to hematopoietic
stem cells, BMSCs have multiorgan homing capacity and an intrinsic
degree of plasticity.12,13 On the basis of this peculiar
functional activity, BMSCs may be used either to replace marrow
microenvironment damaged by myeloablative chemotherapy or to correct
acquired or inherited disorders of bone, muscle, or cartilage or
used as vehicles for gene therapy.14,15 Furthermore, the
importance of marrow microenvironment has been highlighted by the
demonstration that the developmental potential of hematopoietic stem
cells could be reprogrammed by changing their
microenvironment.16
Overall, these findings strongly support a crucial role of BMSCs
in improving the rate and quality of myeloid as well as lymphoid engraftment after lympho-myeloablative and stroma-damaging treatment. Thus, BMSCs seem to play a key role in regulating the maturation and
proliferation as well as functional activation of
lymphocytes.17-20 With the use of a murine model, Li et
al21 have recently demonstrated that donor-derived BMSCs
can migrate into the thymus and participate in the positive selection
of T lymphocytes after bone marrow transplantation (BMT) plus bone
grafts. It, therefore, seems that BMSCs may provide a scaffold for the
adhesion of early T cells and, at least in culture, supply the
appropriate stimuli for thymus precursor cell proliferation.22 It has been reported that the injection
of genetically modified BMSCs in baboon is not followed by their rejection because of the lack of immunogenicity of
BMSCs.23 Indeed, the distinct immunophenotype profile of
BMSCs, ie, low expression of costimulatory molecules associated with
the absence of HLA class II expression,24,25 suggests they
may play an active role in modulating T-cell proliferation.
In the present study, we evaluated the inhibitory activity of BMSCs
added to mixed lymphocyte reactions (MLRs) involving autologous or
allogeneic T cells and third-party peripheral blood mononuclear cells.
Furthermore, we tested the inhibitory effect of BMSCs by using
dendritic cells (DCs) as stimulators, because these cells are
considered professional antigen-presenting cells capable of modulating
T-lymphocyte activation. In addition, the mechanism(s) underlying
BMSC-mediated suppression of T-lymphocyte proliferation was
investigated by evaluating (1) the role of cell-cell contact, (2) the
capacity of monoclonal antibodies neutralizing distinct cytokines to
restore T-cell proliferation, and (3) BMSC-induced T-cell apoptosis.
Human BMSCs
Human T lymphocytes
Stimulators Human DCs were generated ex vivo from highly purified mobilized CD34+ cells after 10 to 12 days' culture in complete medium consisting of 10% recovery-phase autologous serum Iscoves modified Dulbecco media supplemented with granulocyte-macrophage colony-stimulating factor (50 ng/mL), tumor necrosis factor (10 ng/mL), stem cell factor (50 ng/mL), and
flk-2/flt-3 ligand (50 ng/mL). Peripheral blood
lymphocytes (PBLs) were obtained by means of the Ficoll-Hypaque (Pharmacia Biotech, Uppsala, Sweden) gradient separation of the buffy-coat of healthy donors. Both cell populations were irradiated with 30 Gy before use.
Cell surface phenotype Marrow stromal cells detached using trypsin/EDTA were washed and resuspended in phosphate-buffered saline supplemented with human serum (1%), fetal bovine serum (1%), and mouse serum (10%). BMSCs (1 × 105/mL) were then stained for 30 minutes on ice with combinations of saturating amounts of fluorescein isothiocyanate (FITC)-conjugated or phycoerythrin (PE)-conjugated monoclonal antibodies. Fluorochrome-conjugated antibodies recognizing CD45, CD44, CD50, CD90, and HLA-ABC were purchased from Pharmingen (San Diego, CA); the FITC- or PE-conjugated antibodies against CD13, CD14, and HLA-DR were purchased from Becton Dickinson (San Jose, CA,); CD106 was obtained from Southern Biotechnology Associates (Birmingham, AL). Each fluorescence analysis included appropriate PE- and FITC-conjugated negative isotype controls. The percentage of positive cells was determined by subtracting the percentage of fluorescent cells in the control from the percentage of cells positively stained with the appropriate antibody. The cells were analyzed by using a FACScan laser flow cytometry system (Becton Dickinson) equipped with a Macintosh PowerMac G3 personal computer (Apple Computer, Cupertino, CA) and Cell Quest (Becton Dickinson) software.Mixed leukocyte reactions BMSCs and stimulators were irradiated (30 Gy) before being cultured with the T lymphocytes. CD2+ cells (5 × 104) were mixed at different stimulator-to-responder ratios with PBLs or DCs with or without BMSCs in V-bottomed 96-well culture plates to ensure efficient cell-cell contact for 7 days in 0.2 mL modified RPMI-1640 medium (GIBCO BRL) containing 10% heat-inactivated fetal calf serum. T-cell proliferation was measured on day 6 by means of an 18-hour pulse with 3H-thymidine (3H-TdR) (0.037 MBq/well [1 µCi/well], specific activity 24.79 × 1010 Bq/mmol [6.7 Ci/mmol]) (Amersham, Buckingham, United Kingdom). 3H-TdR incorporation was measured by using a liquid scintillation counter (Betaplate, Wallac, Boston, MA). The data are presented as stimulation index values calculated by using the following formula: proliferation of T lymphocytes incubated with cellular or aspecific polyclonal activators with or without BMSCs/proliferation of T lymphocytes alone. The experiments were performed by using either autologous or allogeneic BMSCs with respect to CD2+ cells. In addition, phytohemagglutinin (PHA; 2 µg/mL) or interleukin 2 (IL-2; 500 U/mL) was used instead of PBLs or DCs to induce T-cell proliferation. The experiments were performed at least 3 times for each point described.Restimulation of T lymphocytes following culture with BMSCs To evaluate whether or not BMSC-induced inhibition of T-cell function was reversible, T lymphocytes were initially incubated for 7 days with irradiated BMSCs and either irradiated DCs or PHA. T cells were then harvested by Fycoll-Hypaque centrifugation and cultured with the same stimulators as those used for the primary culture. After 48 hours, the cells were pulsed with 3H-TdR for a further 18 hours. 3H-TdR incorporation was measured and expressed as cpm and represents the mean of 6 separate replicates; the SE never exceeded 9% of the mean.Transwell cultures Transwell chambers with a 0.3-µm pore size membrane (Corning Costar, Cambridge, MA) were used to separate the lymphocytes and stimulators physically from the BMSCs. Lymphocytes at 10 × 105 cells/well were cocultured with 2 × 105 irradiated DCs or PHA (2 µg/mL), whereas autologous or allogeneic BMSCs at 10 × 106 cells/well were placed in the inner transwell chamber. After 5 days of culture, the CD2+ cells were harvested, plated at a concentration of 5 × 105 cells/well in 96-well plates, and pulsed with 3H-TdR for a further 18 hours.Cytokines inhibiting T-lymphocyte proliferation To identify soluble factors responsible for the inhibitory effect of BMSCs, neutralizing monoclonal antibodies directed against cytokines that are known to be produced by BMSCs were added in MLRs containing T cells (5 × 104), irradiated PBLs (5 × 104), and/or irradiated third-party BMSCs (5 × 104). In these experiments, positive controls included MLRs set up with T cells and irradiated PBLs with or without neutralizing monoclonal antibodies. In addition, MLRs were set up that contained T cells, irradiated PBLs, and the appropriate cytokines. The following recombinant human (rh) cytokines and neutralizing monoclonal antibodies were used: transforming growth factor- 1 (rhTGF-1;
Genzyme, Cambridge, MA; 0.1-1 µg/mL) and monoclonal antibody
anti-rhTGF-1 (R&D System, Minneapolis, MN; 0.1-1 µg/mL),
hepatocyte growth factor (rhHGF; R&D System; 0.25-2.5 µg/mL) and
monoclonal antibody anti-rhHGF (R&D System; 0.25-2.5 µg/mL),
interleukin-6 (rhIL-6; PromoCell GmbH, Heidelberg, Germany; 1-5 µg/mL) and monoclonal antibody anti-rhIL-6 (R&D System; 1-5 µg/mL), interleukin-11 (rhIL-11, StemCell Technologies, Vancouver,
Canada; 25-50 µg/mL) and monoclonal antibody anti-rhIL-11 (R&D
System; 25-50 µg/mL).
Determination of the percentage of apoptotic T lymphocytes The percentage of apoptotic T lymphocytes after 7 days' culture with the above-mentioned stimulators (with or without BMSCs) was evaluated by using the annexin V/propidium iodine (PI) staining technique (Bender; MedSystems Diagnostics GmbH, Vienna, Austria) or double staining with CD3 monoclonal antibody (Becton Dickinson) and PI, according to the manufacturer's instructions. Furthermore, on the basis of experimental evidence concerning the expression of CD10 by human T cells that undergo apoptosis,26 the percentage of T lymphocytes expressing the CD10 antigen (Becton Dickinson) was evaluated by means of flow cytometry analysis after they had been cultured with stimulators in the presence of BMSCs.Statistical analysis The results were statistically analyzed by using the Statview statistical package (BrainPower, Calabasas, CA) run on a Macintosh PowerMac G3 personal computer (Apple Computer). The Student t test for paired data (2-tail) was used to test the probability of significant differences between samples.
T-cell proliferation is inhibited by cocultivation with BMSCs BMSCs were generated by culturing marrow-derived mononuclear cells (MNCs) in a Dexter-type culture system. After 2 to 3 weeks of incubation, marrow cells gave rise to a confluent stromal cell layer. At confluence, marrow stroma cells were passaged and replated at low density. After 3 passages, stroma cells were negative for the expression of CD45, CD14, CD34, CD50, and HLA-DR but expressed HLA-ABC, CD44, CD13, and CD90 (data not shown). The effect of BMSCs on T-cell proliferation was evaluated by mixing BMSCs and T lymphocytes in the presence of various stimuli. As shown in Figure 1, there was a significant reduction in T-lymphocyte proliferation when mixed cultures of T lymphocytes stimulated by irradiated allogeneic PBLs (1:1 ratio) were performed in the presence of irradiated autologous BMSCs (90% ± 3%, as measured by means of 3HTdR incorporation; P = .0001). Similarly, when T-lymphocyte proliferation was elicited by means of aspecific polyclonal activators such as PHA (Figure 1) or IL-2 (data not shown), the addition of autologous BMSCs strongly inhibited T-cell proliferation. To assess further the inhibitory effect of BMSCs on T-lymphocyte proliferation, we used CD34+ cell-derived allogeneic DCs, which are considered to be the prototype of professional antigen-presenting cells. Addition of autologous BMSCs to the mixed T-lymphocyte and irradiated allogeneic DC cultures consistently reduced T-lymphocyte proliferation by more than 90% (P = .0001; Figure 1). The inhibition of T-cell proliferation was not observed when third-party BMSCs containing 5%
of CD14+ cells were added to T cells stimulated by
irradiated PBLs. Indeed, under these conditions, T-cell proliferation
was increased over the values observed in standard MLRs of T cells plus
PBLs, probably because of the antigen-presenting cell function exerted
by CD14+ cells (Table 1).
To investigate whether the inhibitory effect of BMSCs on T-lymphocyte
proliferation was dose dependent, we cultured T lymphocytes and
irradiated allogeneic DCs (1:1 ratio) with increasing amounts of
irradiated BMSCs for 7 days. As shown in Figure
2, addition of autologous BMSCs resulted
in a dose-dependent inhibitory effect with a significant reduction of
T-lymphocyte proliferation being observed at a 1:0.2 ratio, with a peak
at a 1:5 ratio. Comparable inhibition was also observed when
third-party BMSCs were used (data not shown). To demonstrate that the
inhibition of DC-induced T-lymphocyte proliferation was caused by
coculture with allogeneic or autologous BMSCs and was not due to a bulk
effect, we cultured T lymphocytes with irradiated allogeneic DCs (1:1
ratio) in the presence of increasing amounts of irradiated autologous T
lymphocytes for 7 days. Under these culture conditions, no suppression
of T-lymphocyte proliferation was detected even when irradiated
autologous T lymphocytes were added at a 1:10 ratio (data not shown),
thus suggesting that the reduction of T-cell proliferation specifically required the presence of BMSCs.
BMSC-inhibited T lymphocytes proliferate on restimulation To evaluate whether or not the inhibition of T-lymphocyte proliferation induced by BMSCs was reversible, T cells stimulated by PHA and cultured for 7 days in the presence of irradiated BMSCs were recovered by Ficoll-Hypaque density gradient centrifugation and restimulated with either irradiated DCs, PHA, or IL-2. Following the initial 7-day culture of T cells with PHA in the presence of irradiated BMSCs (1:1 ratio), T-lymphocyte proliferation was reduced by 90% as compared with MLRs without BMSCs (P = .0001) (Figure 3A). When T lymphocytes were harvested and restimulated for 2 days with allogeneic DCs, PHA, or IL-2, the restimulation led to a degree of proliferation that was comparable to that observed in control cultures without BMSCs, thus demonstrating that BMSC-induced inhibition of T-cell proliferation is a reversible phenomenon (Figure 3B).
T-lymphocyte proliferation is inhibited by the delayed addition of BMSCs To investigate whether or not the delayed addition of BMSCs could suppress T-cell proliferation, BMSCs were added in a 1:1 ratio to 5-day-old cultures of T lymphocytes stimulated by either allogeneic DCs or PHA. As shown in Figure 4, T-lymphocyte proliferation induced by DCs or PHA was significantly inhibited by the delayed addition of BMSCs (75% ± 3% and 90% ± 2%, respectively).
CD4 and CD8 T lymphocytes are equally inhibited by BMSCs To investigate whether or not BMSCs could selectively inhibit the proliferation of T-lymphocyte subsets, CD4+ and CD8+ T cells stimulated by allogeneic PBLs, DCs, or PHA were cultured with or without BMSCs (1:1 ratio). As shown in Figure 5, the addition of BMSCs equally suppressed the proliferation of both CD4+ and CD8+ T lymphocytes induced by cellular or humoral stimuli.
Mechanism(s) of BMSC-induced T-cell suppression To investigate the mechanism(s) underlying BMSC-mediated T-cell suppression, we initially evaluated whether BMSC inhibition of T-cell proliferation was dependent on a cell-cell contact mechanism. To test this hypothesis, MLRs were performed by using transwell chambers to separate CD2+ cells and stimulators physically from the BMSCs. By using the transwell system, ie, when BMSCs were separated from effectors, T-lymphocyte proliferation was significantly inhibited (70% ± 13%; P = .0001; Figure 6), thus suggesting that a soluble factor was involved in suppressing T-cell proliferation. However, the rate of T-lymphocyte inhibition was further increased when a cell-cell contact between BMSCs and effector cells was allowed (P = .004).
To identify inhibitory cytokines potentially suppressing T-cell proliferation, monoclonal antibodies neutralizing distinct cytokines that are known to be produced by BMSCs were evaluated for their capacity to restore T-cell proliferation. Although addition of neutralizing monoclonal antibodies anti-rhIL-6
and anti-rhIL-11 failed to restore T-cell proliferation suppressed by
BMSCs, addition of monoclonal antibodies neutralizing either rhTGF- As compared with control MLRs containing T cells plus irradiated
PBLs but not BMSCs, addition of TGF-
To test whether or not the inhibitory effect of BMSCs was associated with T-lymphocyte apoptosis, the percentage of CD2+/PI+ cells and the expression of CD10 antigen, which may represent a reliable marker for identifying and isolating apoptotic T-lymphocytes,27 were evaluated after 7-day culture of T lymphocytes with DCs (or PHA) and BMSCs. The percentage of CD2+ cells that were also PI+ was less than 2% ± 1%; furthermore, the harvested CD2+ cells did not express CD10 antigen on their cell surface (data not shown).
In the present paper, we demonstrate that (1) ex vivo-expanded
BMSCs have an inhibitory effect on T-cell proliferation triggered by
allogeneic PBLs and DCs, or mitogens such as PHA or IL-2; (2) this
effect is dose dependent and is still evident when BMSCs come from a
third party; (3) BMSC-inhibited T lymphocytes are not apoptotic and
efficiently proliferate when restimulated with cellular or humoral
activators in the absence of BMSCs; (4) the delayed addition of BMSCs
to MLRs leads to the inhibition of T-cell proliferation; (5)
CD4+ and CD8+ T cells are equally inhibited by
BMSCs; and (6) BMSC-released cytokines, such as rhHGF and/or
rhTGF- Bone marrow is the major source of the adult hemopoietic stem cells that renew circulating blood elements. Adult bone marrow also contains stromal stem cells, which contribute to the regeneration of several tissues such as bone, cartilage, muscle, ligament, tendon, adipose tissue, and marrow stroma.9 Human BMSCs have been identified and characterized, and it has been shown that they support hematopoietic progenitors and secrete a number of hematopoietic cytokines both constitutively and in response to IL-1.27,28 Genetically modified BMSCs are not rejected when transplanted in baboons, thus suggesting that they are not significantly immunogenic.24 This finding may be due to the peculiar immunophenotypic features of BMSCs, such as the lack of HLA class II as well as the T-cell costimulatory molecule B7.25,29 Current technology allowing the ex vivo expansion of BMSCs without any apparent loss of phenotype and function25,29 opens the way to the clinical application of BMSCs in allogeneic BMT. Recently, Lazarus et al30 reported a phase I BMSC dose-escalation study evaluating the cotransplantation of HLA-identical BMSCs together with either peripheral blood or bone marrow-derived hematopoietic stem cells from the same donor in patients with advanced hematologic malignancies. To date, no significant toxicities have been observed, and the 15 evaluable patients experienced a reduction of acute and chronic graft-versus-host disease (GVHD).30 Data reported in our paper confirm the inhibitory effect of BMSCs on T-cell proliferation triggered by cellular or humoral stimuli. To further evaluate the inhibitory effect of BMSCs, we also used as MLR stimulators allogeneic professional antigen-presenting cells (ie, CD34+ cell-derived DCs) known to be the best stimulators of T-cell proliferation. Even under these experimental conditions, there was a dramatic and dose-dependent reduction of T-cell proliferation. Indeed, when the amount of CD14+ macrophages contaminating stromal cell layers of a third party was 5%, no evidence of suppression of T-cell proliferation could be detected. This finding is likely to be due to the peculiar antigen expression profile of CD14+ cells, including the high expression of MHC class I and II antigens as well as expression of costimulatory molecules, which results in a strong stimulation of T-cell proliferation. As far as the mechanism(s) underlying the inhibitory effect of
BMSCs is concerned, data reported herein rule out the possibility that
BMSCs induce T-cell apoptosis, whereas they strongly suggest that
cell-cell contact is not a mandatory requirement for suppressing T-cell
proliferation, whereas BMSCs produce soluble factors, including rhTGF- Several cell types, including graft-facilitating cells,32 veto cells,33 and even CD34+ cells,34 have been demonstrated in in vitro and in vivo models to be able to exert immunoregulatory effects resulting in prevention of GVHD or tolerogenic activities. Ex vivo-generated BMSCs might be useful in clinical situations in which engraftment failure is high, such as HLA-mismatched sibling, matched unrelated donor marrow, or umbilical cord blood transplantation, and may decrease GVHD and facilitate the engraftment and proliferation of hemopoietic progenitors. Reinfusion of BMSCs aimed at exploiting an immunoregulatory role might eventually be of relevance also in the setting of allografting with reduced conditioning regimens. The obvious prerequisite for stromal cell-based therapy is that stromal cells must be capable of efficient engraftment. Although it has been demonstrated in various animal models, the engraftment of BMSCs in patients undergoing allogeneic stem cell transplantation appears to be absent35 or limited, as recently shown by us in recipients of allogeneic T-cell-depleted stem cell allografts.36 Recent studies using ex vivo-generated stromal cells have clearly shown that, when stromal cells are transplanted in the human-sheep xenograft model of in utero transplantation, they seed the bone marrow, enhance hematopoietic recovery, and are capable of eliciting tissue-specific differentiation programs.37,38 However, the question is still open for humans, and no conclusive evidence has yet been provided concerning the homing properties and in vivo persistence of ex vivo-generated stromal cells. In conclusion, the data presented in this paper clearly
demonstrate that BMSCs suppress T-cell proliferation induced by
cellular or humoral stimuli. This finding implies that the in vitro
phenomenon we report herein is likely to be an antigen-independent
immunologic effect. In addition, BMSC-induced T-cell suppression has no
immunologic restriction because both autologous and third-party BMSCs
can suppress T-cell proliferation. The mechanism underlying
BMSC-mediated suppression of T-cell proliferation
We thank Drs. F. Locatelli and R. Maccario (Department of Pediatrics, Università di Pavia, Pavia, Italy) for providing a critical review of the manuscript and Dr A. Anichini (Department of Experimental Oncology, Istituto Nazionale Tumori, Milan, Italy) for helpful discussion.
Submitted March 8, 2001; accepted January 11, 2002.
Supported in part by grants from "Ministero dell'Istruzione, Università e Ricerca," and "Associazione Italiana per la Ricerca sul Cancro" (A.I.R.C.).
M.D.N. and C.C.-S. contributed equally to this work.
The publication costs of this article were defrayed in part by page charge payment. Therefore, and solely to indicate this fact, this article is hereby marked "advertisement" in accordance with 18 U.S.C. section 1734.
Reprints: Massimo Di Nicola, "C Gandini" Bone Marrow Transplantation Unit, Istituto Nazionale Tumori, Via Venezian, 1 Milan, Italy; e-mail: dinicola{at}istitutotumori.mi.it.
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G. M. Spaggiari, H. Abdelrazik, F. Becchetti, and L. Moretta MSCs inhibit monocyte-derived DC maturation and function by selectively interfering with the generation of immature DCs: central role of MSC-derived prostaglandin E2 Blood, June 25, 2009; 113(26): 6576 - 6583. [Abstract] [Full Text] [PDF]
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Z.-Y. Zhang, S.-H. Teoh, M. S.K. Chong, J. T. Schantz, N. M. Fisk, M. A. Choolani, and J. Chan Superior Osteogenic Capacity for Bone Tissue Engineering of Fetal Compared with Perinatal and Adult Mesenchymal Stem Cells Stem Cells, January 1, 2009; 27(1): 126 - 137. [Abstract] [Full Text] [PDF]
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M. L. Weiss, C. Anderson, S. Medicetty, K. B. Seshareddy, R. J. Weiss, I. VanderWerff, D. Troyer, and K. R. McIntosh Immune Properties of Human Umbilical Cord Wharton's Jelly-Derived Cells Stem Cells, November 1, 2008; 26(11): 2865 - 2874. [Abstract] [Full Text] [PDF]
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A. Banas, T. Teratani, Y. Yamamoto, M. Tokuhara, F. Takeshita, M. Osaki, M. Kawamata, T. Kato, H. Okochi, and T. Ochiya IFATS Collection: In Vivo Therapeutic Potential of Human Adipose Tissue Mesenchymal Stem Cells After Transplantation into Mice with Liver Injury Stem Cells, October 1, 2008; 26(10): 2705 - 2712. [Abstract] [Full Text] [PDF]
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H. Li, Z. Guo, X. Jiang, H. Zhu, X. Li, and N. Mao Mesenchymal Stem Cells Alter Migratory Property of T and Dendritic Cells to Delay the Development of Murine Lethal Acute Graft-Versus-Host Disease Stem Cells, October 1, 2008; 26(10): 2531 - 2541. [Abstract] [Full Text] [PDF]
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S. Ishikane, S. Ohnishi, K. Yamahara, M. Sada, K. Harada, K. Mishima, K. Iwasaki, M. Fujiwara, S. Kitamura, N. Nagaya, et al. Allogeneic Injection of Fetal Membrane-Derived Mesenchymal Stem Cells Induces Therapeutic Angiogenesis in a Rat Model of Hind Limb Ischemia Stem Cells, October 1, 2008; 26(10): 2625 - 2633. [Abstract] [Full Text] [PDF]
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F. Casiraghi, N. Azzollini, P. Cassis, B. Imberti, M. Morigi, D. Cugini, R. A. Cavinato, M. Todeschini, S. Solini, A. Sonzogni, et al. Pretransplant Infusion of Mesenchymal Stem Cells Prolongs the Survival of a Semiallogeneic Heart Transplant through the Generation of Regulatory T Cells J. Immunol., September 15, 2008; 181(6): 3933 - 3946. [Abstract] [Full Text] [PDF]
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L. Jarvinen, L. Badri, S. Wettlaufer, T. Ohtsuka, T. J. Standiford, G. B. Toews, D. J. Pinsky, M. Peters-Golden, and V. N. Lama Lung Resident Mesenchymal Stem Cells Isolated from Human Lung Allografts Inhibit T Cell Proliferation via a Soluble Mediator J. Immunol., September 15, 2008; 181(6): 4389 - 4396. [Abstract] [Full Text] [PDF]
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L. da Silva Meirelles, A. I. Caplan, and N. B. Nardi In Search of the In Vivo Identity of Mesenchymal Stem Cells Stem Cells, September 1, 2008; 26(9): 2287 - 2299. [Abstract] [Full Text] [PDF]
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P. J. Psaltis, A. C.W. Zannettino, S. G. Worthley, and S. Gronthos Concise Review: Mesenchymal Stromal Cells: Potential for Cardiovascular Repair Stem Cells, September 1, 2008; 26(9): 2201 - 2210. [Abstract] [Full Text] [PDF]
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H. Karlsson, S. Samarasinghe, L. M. Ball, B. Sundberg, A. C. Lankester, F. Dazzi, M. Uzunel, K. Rao, P. Veys, K. Le Blanc, et al. Mesenchymal stem cells exert differential effects on alloantigen and virus-specific T-cell responses Blood, August 1, 2008; 112(3): 532 - 541. [Abstract] [Full Text] [PDF]
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B. Parekkadan, A. W. Tilles, and M. L. Yarmush Bone Marrow-Derived Mesenchymal Stem Cells Ameliorate Autoimmune Enteropathy Independently of Regulatory T Cells Stem Cells, July 1, 2008; 26(7): 1913 - 1919. [Abstract] [Full Text] [PDF]
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F. Morandi, L. Raffaghello, G. Bianchi, F. Meloni, A. Salis, E. Millo, S. Ferrone, V. Barnaba, and V. Pistoia Immunogenicity of Human Mesenchymal Stem Cells in HLA-Class I-Restricted T-Cell Responses Against Viral or Tumor-Associated Antigens Stem Cells, May 1, 2008; 26(5): 1275 - 1287. [Abstract] [Full Text] [PDF]
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J. Y. Oh, M. K. Kim, M. S. Shin, H. J. Lee, J. H. Ko, W. R. Wee, and J. H. Lee The Anti-Inflammatory and Anti-Angiogenic Role of Mesenchymal Stem Cells in Corneal Wound Healing Following Chemical Injury Stem Cells, April 1, 2008; 26(4): 1047 - 1055. [Abstract] [Full Text] [PDF]
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J Larghero, D Farge, A Braccini, S Lecourt, A Scherberich, E Fois, F Verrecchia, T Daikeler, E Gluckman, A Tyndall, et al. Phenotypical and functional characteristics of in vitro expanded bone marrow mesenchymal stem cells from patients with systemic sclerosis Ann Rheum Dis, April 1, 2008; 67(4): 443 - 449. [Abstract] [Full Text] [PDF]
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Y.-P. Li, S. Paczesny, E. Lauret, S. Poirault, P. Bordigoni, F. Mekhloufi, O. Hequet, Y. Bertrand, J.-P. Ou-Yang, J.-F. Stoltz, et al. Human Mesenchymal Stem Cells License Adult CD34+ Hemopoietic Progenitor Cells to Differentiate into Regulatory Dendritic Cells through Activation of the Notch Pathway J. Immunol., February 1, 2008; 180(3): 1598 - 1608. [Abstract] [Full Text] [PDF]
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G. M. Spaggiari, A. Capobianco, H. Abdelrazik, F. Becchetti, M. C. Mingari, and L. Moretta Mesenchymal stem cells inhibit natural killer-cell proliferation, cytotoxicity, and cytokine production: role of indoleamine 2,3-dioxygenase and prostaglandin E2 Blood, February 1, 2008; 111(3): 1327 - 1333. [Abstract] [Full Text] [PDF]
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M. Magatti, S. De Munari, E. Vertua, L. Gibelli, G. S. Wengler, and O. Parolini Human Amnion Mesenchyme Harbors Cells with Allogeneic T-Cell Suppression and Stimulation Capabilities Stem Cells, January 1, 2008; 26(1): 182 - 192. [Abstract] [Full Text] [PDF]
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L. Raffaghello, G. Bianchi, M. Bertolotto, F. Montecucco, A. Busca, F. Dallegri, L. Ottonello, and V. Pistoia Human Mesenchymal Stem Cells Inhibit Neutrophil Apoptosis: A Model for Neutrophil Preservation in the Bone Marrow Niche Stem Cells, January 1, 2008; 26(1): 151 - 162. [Abstract] [Full Text] [PDF]
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Z. Selmani, A. Naji, I. Zidi, B. Favier, E. Gaiffe, L. Obert, C. Borg, P. Saas, P. Tiberghien, N. Rouas-Freiss, et al. Human Leukocyte Antigen-G5 Secretion by Human Mesenchymal Stem Cells Is Required to Suppress T Lymphocyte and Natural Killer Function and to Induce CD4+CD25highFOXP3+ Regulatory T Cells Stem Cells, January 1, 2008; 26(1): 212 - 222. [Abstract] [Full Text] [PDF]
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F. Liotta, R. Angeli, L. Cosmi, L. Fili, C. Manuelli, F. Frosali, B. Mazzinghi, L. Maggi, A. Pasini, V. Lisi, et al. Toll-Like Receptors 3 and 4 Are Expressed by Human Bone Marrow-Derived Mesenchymal Stem Cells and Can Inhibit Their T-Cell Modulatory Activity by Impairing Notch Signaling Stem Cells, January 1, 2008; 26(1): 279 - 289. [Abstract] [Full Text] [PDF]
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I. A. Isakova, K. Baker, M. DuTreil, J. Dufour, D. Gaupp, and D. G. Phinney Age- and Dose-Related Effects on MSC Engraftment Levels and Anatomical Distribution in the Central Nervous Systems of Nonhuman Primates: Identification of Novel MSC Subpopulations That Respond to Guidance Cues in Brain Stem Cells, December 1, 2007; 25(12): 3261 - 3270. [Abstract] [Full Text] [PDF]
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D. Chabannes, M. Hill, E. Merieau, J. Rossignol, R. Brion, J. P. Soulillou, I. Anegon, and M. C. Cuturi A role for heme oxygenase-1 in the immunosuppressive effect of adult rat and human mesenchymal stem cells Blood, November 15, 2007; 110(10): 3691 - 3694. [Abstract] [Full Text] [PDF]
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G. Chamberlain, J. Fox, B. Ashton, and J. Middleton Concise Review: Mesenchymal Stem Cells: Their Phenotype, Differentiation Capacity, Immunological Features, and Potential for Homing Stem Cells, November 1, 2007; 25(11): 2739 - 2749. [Abstract] [Full Text] [PDF]
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S. Jones, N. Horwood, A. Cope, and F. Dazzi The Antiproliferative Effect of Mesenchymal Stem Cells Is a Fundamental Property Shared by All Stromal Cells J. Immunol., September 1, 2007; 179(5): 2824 - 2831. [Abstract] [Full Text] [PDF]
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P. Batten, N. A Rosenthal, and M. H Yacoub Immune response to stem cells and strategies to induce tolerance Phil Trans R Soc B, August 29, 2007; 362(1484): 1343 - 1356. [Abstract] [Full Text] [PDF]
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M. A. Haniffa, X.-N. Wang, U. Holtick, M. Rae, J. D. Isaacs, A. M. Dickinson, C. M. U. Hilkens, and M. P. Collin Adult Human Fibroblasts Are Potent Immunoregulatory Cells and Functionally Equivalent to Mesenchymal Stem Cells J. Immunol., August 1, 2007; 179(3): 1595 - 1604. [Abstract] [Full Text] [PDF]
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F. Djouad, L.-M. Charbonnier, C. Bouffi, P. Louis-Plence, C. Bony, F. Apparailly, C. Cantos, C. Jorgensen, and D. Noel Mesenchymal Stem Cells Inhibit the Differentiation of Dendritic Cells Through an Interleukin-6-Dependent Mechanism Stem Cells, August 1, 2007; 25(8): 2025 - 2032. [Abstract] [Full Text] [PDF]
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F. Locatelli, R. Maccario, and F. Frassoni Mesenchymal stromal cells, from indifferent spectators to principal actors. Are we going to witness a revolution in the scenario of allograft and immune-mediated disorders? Haematologica, July 1, 2007; 92(7): 872 - 877. [Full Text] [PDF]
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C. Prevosto, M. Zancolli, P. Canevali, M. R. Zocchi, and A. Poggi Generation of CD4+ or CD8+ regulatory T cells upon mesenchymal stem cell-lymphocyte interaction Haematologica, July 1, 2007; 92(7): 881 - 888. [Abstract] [Full Text] [PDF]
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F. Benvenuto, S. Ferrari, E. Gerdoni, F. Gualandi, F. Frassoni, V. Pistoia, G. Mancardi, and A. Uccelli Human Mesenchymal Stem Cells Promote Survival of T Cells in a Quiescent State Stem Cells, July 1, 2007; 25(7): 1753 - 1760. [Abstract] [Full Text] [PDF]
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A. Viswanathan, R. G. Painter, N. A. Lanson Jr., and G. Wang Functional Expression of N-Formyl Peptide Receptors in Human Bone Marrow-Derived Mesenchymal Stem Cells Stem Cells, May 1, 2007; 25(5): 1263 - 1269. [Abstract] [Full Text] [PDF]
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C. Bocelli-Tyndall, L. Bracci, G. Spagnoli, A. Braccini, M. Bouchenaki, R. Ceredig, V. Pistoia, I. Martin, and A. Tyndall Bone marrow mesenchymal stromal cells (BM-MSCs) from healthy donors and auto-immune disease patients reduce the proliferation of autologous- and allogeneic-stimulated lymphocytes in vitro Rheumatology, March 1, 2007; 46(3): 403 - 408. [Abstract] [Full Text] [PDF]
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X. Chen, A. McClurg, G.-Q. Zhou, M. McCaigue, M. A. Armstrong, and G. Li Chondrogenic Differentiation Alters the Immunosuppressive Property of Bone Marrow-Derived Mesenchymal Stem Cells, and the Effect Is Partially due to the Upregulated Expression of B7 Molecules Stem Cells, February 1, 2007; 25(2): 364 - 370. [Abstract] [Full Text] [PDF]
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Q. He, C. Wan, and G. Li Concise Review: Multipotent Mesenchymal Stromal Cells in Blood Stem Cells, January 1, 2007; 25(1): 69 - 77. [Abstract] [Full Text] [PDF]
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K. Sato, K. Ozaki, I. Oh, A. Meguro, K. Hatanaka, T. Nagai, K. Muroi, and K. Ozawa Nitric oxide plays a critical role in suppression of T-cell proliferation by mesenchymal stem cells Blood, January 1, 2007; 109(1): 228 - 234. [Abstract] [Full Text] [PDF]
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C.-J. Chang, M.-L. Yen, Y.-C. Chen, C.-C. Chien, H.-I. Huang, C.-H. Bai, and B. L. Yen Placenta-Derived Multipotent Cells Exhibit Immunosuppressive Properties That Are Enhanced in the Presence of Interferon-{gamma} Stem Cells, November 1, 2006; 24(11): 2466 - 2477. [Abstract] [Full Text] [PDF]
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M. R. Rosen Are Stem Cells Drugs?: The Regulation of Stem Cell Research and Development Circulation, October 31, 2006; 114(18): 1992 - 2000. [Abstract] [Full Text] [PDF]
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A. J. Nauta, A. B. Kruisselbrink, E. Lurvink, R. Willemze, and W. E. Fibbe Mesenchymal Stem Cells Inhibit Generation and Function of Both CD34+-Derived and Monocyte-Derived Dendritic Cells J. Immunol., August 15, 2006; 177(4): 2080 - 2087. [Abstract] [Full Text] [PDF]
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M. Sudres, F. Norol, A. Trenado, S. Gregoire, F. Charlotte, B. Levacher, J.-J. Lataillade, P. Bourin, X. Holy, J.-P. Vernant, et al. Bone Marrow Mesenchymal Stem Cells Suppress Lymphocyte Proliferation In Vitro but Fail to Prevent Graft-versus-Host Disease in Mice. J. Immunol., June 15, 2006; 176(12): 7761 - 7767. [Abstract] [Full Text] [PDF]
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B. Gangadharan, E. T. Parker, L. M. Ide, H. T. Spencer, and C. B. Doering High-level expression of porcine factor VIII from genetically modified bone marrow-derived stem cells Blood, May 15, 2006; 107(10): 3859 - 3864. [Abstract] [Full Text] [PDF]
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K. McIntosh, S. Zvonic, S. Garrett, J. B. Mitchell, Z. E. Floyd, L. Hammill, A. Kloster, Y. Di Halvorsen, J. P. Ting, R. W. Storms, et al. The Immunogenicity of Human Adipose-Derived Cells: Temporal Changes In Vitro Stem Cells, May 1, 2006; 24(5): 1246 - 1253. [Abstract] [Full Text] [PDF]
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J. Stagg, S. Pommey, N. Eliopoulos, and J. Galipeau Interferon-{gamma}-stimulated marrow stromal cells: a new type of nonhematopoietic antigen-presenting cell Blood, March 15, 2006; 107(6): 2570 - 2577. [Abstract] [Full Text] [PDF]
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H. Liu, D. M. Kemeny, B. C. Heng, H. W. Ouyang, A. J. Melendez, and T. Cao The immunogenicity and immunomodulatory function of osteogenic cells differentiated from mesenchymal stem cells. J. Immunol., March 1, 2006; 176(5): 2864 - 2871. [Abstract] [Full Text] [PDF]
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G. M. Spaggiari, A. Capobianco, S. Becchetti, M. C. Mingari, and L. Moretta Mesenchymal stem cell-natural killer cell interactions: evidence that activated NK cells are capable of killing MSCs, whereas MSCs can inhibit IL-2-induced NK-cell proliferation Blood, February 15, 2006; 107(4): 1484 - 1490. [Abstract] [Full Text] [PDF]
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M. Aluigi, M. Fogli, A. Curti, A. Isidori, E. Gruppioni, C. Chiodoni, M. P. Colombo, P. Versura, A. D'Errico-Grigioni, E. Ferri, et al. Nucleofection Is an Efficient Nonviral Transfection Technique for Human Bone Marrow-Derived Mesenchymal Stem Cells Stem Cells, February 1, 2006; 24(2): 454 - 461. [Abstract] [Full Text] [PDF]
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P. A. Sotiropoulou, S. A. Perez, M. Salagianni, C. N. Baxevanis, and M. Papamichail Characterization of the Optimal Culture Conditions for Clinical Scale Production of Human Mesenchymal Stem Cells Stem Cells, February 1, 2006; 24(2): 462 - 471. [Abstract] [Full Text] [PDF]
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M. Krampera, L. Cosmi, R. Angeli, A. Pasini, F. Liotta, A. Andreini, V. Santarlasci, B. Mazzinghi, G. Pizzolo, F. Vinante, et al. Role for Interferon-{gamma} in the Immunomodulatory Activity of Human Bone Marrow Mesenchymal Stem Cells Stem Cells, February 1, 2006; 24(2): 386 - 398. [Abstract] [Full Text] [PDF]
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P. A. Sotiropoulou, S. A. Perez, A. D. Gritzapis, C. N. Baxevanis, and M. Papamichail Interactions Between Human Mesenchymal Stem Cells and Natural Killer Cells Stem Cells, January 1, 2006; 24(1): 74 - 85. [Abstract] [Full Text] [PDF]
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D. G. Phinney, K. Hill, C. Michelson, M. DuTreil, C. Hughes, S. Humphries, R. Wilkinson, M. Baddoo, and E. Bayly Biological Activities Encoded by the Murine Mesenchymal Stem Cell Transcriptome Provide a Basis for Their Developmental Potential and Broad Therapeutic Efficacy Stem Cells, January 1, 2006; 24(1): 186 - 198. [Abstract] [Full Text] [PDF]
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A. Corcione, F. Benvenuto, E. Ferretti, D. Giunti, V. Cappiello, F. Cazzanti, M. Risso, F. Gualandi, G. L. Mancardi, V. Pistoia, et al. Human mesenchymal stem cells modulate B-cell functions Blood, January 1, 2006; 107(1): 367 - 372. [Abstract] [Full Text] [PDF]
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N. Eliopoulos, J. Stagg, L. Lejeune, S. Pommey, and J. Galipeau Allogeneic marrow stromal cells are immune rejected by MHC class I- and class II-mismatched recipient mice Blood, December 15, 2005; 106(13): 4057 - 4065. [Abstract] [Full Text] [PDF]
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A. Poggi, C. Prevosto, A.-M. Massaro, S. Negrini, S. Urbani, I. Pierri, R. Saccardi, M. Gobbi, and M. R. Zocchi Interaction between Human NK Cells and Bone Marrow Stromal Cells Induces NK Cell Triggering: Role of NKp30 and NKG2D Receptors J. Immunol., November 15, 2005; 175(10): 6352 - 6360. [Abstract] [Full Text] [PDF]
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D. J. MacDonald, J. Luo, T. Saito, M. Duong, P.-L. Bernier, R. C.J. Chiu, and D. Shum-Tim Persistence of marrow stromal cells implanted into acutely infarcted myocardium: Observations in a xenotransplant model J. Thorac. Cardiovasc. Surg., October 1, 2005; 130(4): 1114 - 1121. [Abstract] [Full Text] [PDF]
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B. R Blazar and W. J Murphy Bone marrow transplantation and approaches to avoid graft-versus-host disease (GVHD) Phil Trans R Soc B, September 29, 2005; 360(1461): 1747 - 1767. [Abstract] [Full Text] [PDF]
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T. Tondreau, N. Meuleman, A. Delforge, M. Dejeneffe, R. Leroy, M. Massy, C. Mortier, D. Bron, and L. Lagneaux Mesenchymal Stem Cells Derived from CD133-Positive Cells in Mobilized Peripheral Blood and Cord Blood: Proliferation, Oct4 Expression, and Plasticity Stem Cells, September 1, 2005; 23(8): 1105 - 1112. [Abstract] [Full Text] [PDF]
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A. Shahdadfar, K. Fronsdal, T. Haug, F. P. Reinholt, and J. E. Brinchmann In Vitro Expansion of Human Mesenchymal Stem Cells: Choice of Serum Is a Determinant of Cell Proliferation, Differentiation, Gene Expression, and Transcriptome Stability Stem Cells, September 1, 2005; 23(9): 1357 - 1366. [Abstract] [Full Text] [PDF]
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E. Zappia, S. Casazza, E. Pedemonte, F. Benvenuto, I. Bonanni, E. Gerdoni, D. Giunti, A. Ceravolo, F. Cazzanti, F. Frassoni, et al. Mesenchymal stem cells ameliorate experimental autoimmune encephalomyelitis inducing T-cell anergy Blood, September 1, 2005; 106(5): 1755 - 1761. [Abstract] [Full Text] [PDF]
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K. C. Wollert and H. Drexler Mesenchymal Stem Cells for Myocardial Infarction: Promises and Pitfalls Circulation, July 12, 2005; 112(2): 151 - 153. [Full Text] [PDF]
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X.-X. Jiang, Y. Zhang, B. Liu, S.-X. Zhang, Y. Wu, X.-D. Yu, and N. Mao Human mesenchymal stem cells inhibit differentiation and function of monocyte-derived dendritic cells Blood, May 15, 2005; 105(10): 4120 - 4126. [Abstract] [Full Text] [PDF]
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 A.-M. Rodriguez, D. Pisani, C. A. Dechesne, C. Turc-Carel, J.-Y. Kurzenne, B. Wdziekonski, A. Villageois, C. Bagnis, J.-P. Breittmayer, H. Groux, et al. Transplantation of a multipotent cell population from human adipose tissue induces dystrophin expression in the immunocompetent mdx mouse J. Exp. Med., May 2, 2005; 201(9): 1397 - 1405. [Abstract] [Full Text] [PDF]
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S. Glennie, I. Soeiro, P. J. Dyson, E. W.-F. Lam, and F. Dazzi Bone marrow mesenchymal stem cells induce division arrest anergy of activated T cells Blood, April 1, 2005; 105(7): 2821 - 2827. [Abstract] [Full Text] [PDF]
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P. Terness, J.-J. Chuang, T. Bauer, L. Jiga, and G. Opelz Regulation of human auto- and alloreactive T cells by indoleamine 2,3-dioxygenase (IDO)-producing dendritic cells: too much ado about IDO? Blood, March 15, 2005; 105(6): 2480 - 2486. [Abstract] [Full Text] [PDF]
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Y. Suzuki, Y. Adachi, K. Minamino, Y. Zhang, M. Iwasaki, K. Nakano, Y. Koike, and S. Ikehara A New Strategy for Treatment of Malignant Tumor: Intra-Bone Marrow-Bone Marrow Transplantation Plus CD4- Donor Lymphocyte Infusion Stem Cells, March 1, 2005; 23(3): 365 - 370. [Abstract] [Full Text] [PDF]
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S. Aggarwal and M. F. Pittenger Human mesenchymal stem cells modulate allogeneic immune cell responses Blood, February 15, 2005; 105(4): 1815 - 1822. [Abstract] [Full Text] [PDF]
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Top
Abstract
Introduction
which seems to be
due to a production of cytokines by stromal cells
cells in whole bone marrow facilitate the engraftment of hematopoietic stem cells across allogeneic barriers.
Immunity.
1999;11:579-590