scholarly journals Single Cell Phenotyping Reveals Heterogeneity among Haematopoietic Stem Cells Following Infection

2016 ◽  
Author(s):  
Adam L MacLean ◽  
Maia A Smith ◽  
Juliane Liepe ◽  
Aaron Sim ◽  
Reema Khorshed ◽  
...  
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Stem Cell ◽  
Single Cell ◽  
Life History Theory ◽  
Cell Function ◽  
Trichinella Spiralis ◽  
Haematopoietic Stem Cell ◽  
Haematopoietic Stem Cells ◽  
Hsc Niche

AbstractThe haematopoietic stem cell (HSC) niche provides essential micro-environmental cues for the production and maintenance of HSCs within the bone marrow. During inflammation, haematopoietic dynamics are perturbed, but it is not known whether changes to the HSC-niche interaction occur as a result. We visualise HSCs directly in vivo, enabling detailed analysis of the 3D niche dynamics and migration patterns in murine bone marrow following Trichinella spiralis infection. Spatial statistical analysis of these HSC trajectories reveals two distinct modes of HSC behaviour: (i) a pattern of revisiting previously explored space, and (ii) a pattern of exploring new space. Whereas HSCs from control donors predominantly follow pattern (i), those from infected mice adopt both strategies. Using detailed computational analyses of cell migration tracks and life-history theory, we show that the increased motility of HSCs following infection can, perhaps counterintuitively, enable mice to cope better in deteriorating HSC-niche micro-environments following infection.Author SummaryHaematopoietic stem cells reside in the bone marrow where they are crucially maintained by an incompletely-determined set of niche factors. Recently it has been shown that chronic infection profoundly affects haematopoiesis by exhausting stem cell function, but these changes have not yet been resolved at the single cell level. Here we show that the stem cell–niche interactions triggered by infection are heterogeneous whereby cells exhibit different behavioural patterns: for some, movement is highly restricted, while others explore much larger regions of space over time. Overall, cells from infected mice display higher levels of persistence. This can be thought of as a search strategy: during infection the signals passed between stem cells and the niche may be blocked or inhibited. Resultantly, stem cells must choose to either ‘cling on’, or to leave in search of a better environment. The heterogeneity that these cells display has immediate consequences for translational therapies involving bone marrow transplant, and the effects that infection might have on these procedures.

scholarly journals Bloodlines of haematopoietic stem cell research in Japan

2008 ◽  
Vol 363 (1500) ◽  
pp. 2089-2097 ◽  
Author(s):  
Hideo Ema ◽  
Hiromitsu Nakauchi
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Stem Cell ◽  
Blood Cells ◽  
Original Work ◽  
Cord Blood Transplantation ◽  
Adult Life ◽  
Haematopoietic Stem Cell ◽  
Haematopoietic Stem Cells ◽  
Blood Transplantation

Haematopoietic stem cells (HSCs) can supply all blood cells throughout the adult life of individuals. Based on this property, HSCs have been used for bone marrow and cord blood transplantation. Among various stem cells, HSCs were recognized earliest and were studied most extensively, providing a model for other stem cells. Knowledge of HSC regulation has rapidly accumulated of late. Contributions of scientists in Japan to progress HSC biology are here briefly overviewed. Focusing on the original work accomplished in Japan in the last two decades, people who have led such activities are introduced and their relationships with one another are sketched.

scholarly journals Beginning of a Journey of Autologous Stem Cell Transplantation in Combined Military Hospital, Dhaka, Bangladesh

2018 ◽  
Vol 8 (2) ◽  
pp. 177-180
Author(s):  
Mohammed Mosleh Uddin ◽  
Huque Mahfuz ◽  
Md Mostafil Karim
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Stem Cell ◽  
Stem Cell Transplantation ◽  
Hodgkin Lymphoma ◽  
Cell Transplantation ◽  
Autologous Stem Cell Transplantation ◽  
Peripheral Blood ◽  
Haematopoietic Stem Cell ◽  
Military Hospital

Haematopoietic stem cell transplantation (HSCT) involves the intravenous infusion of autologous or allogenic stem cells collected from bone marrow, peripheral blood or umbilical cord to re-establish haematopoietic function in patients whose bone marrow or immune system is damaged or defective. HSCT are mainly of two types –autologous stem cell transplantation (SCT) and allogenic SCT. Autologous SCT is mainly performed in multiple myeloma, Hodgkin lymphoma, non-Hodgkin lymphoma and less commonly in acute myeloid leukaemia. Haematopoietic stem cells are mobilized from bone marrow to the peripheral blood after the use of mobilizing agents, granulocyte colony stimulating factor (G-CSF) and plerixafor. Then the mobilized stem cells are collected from peripheral blood by apheresis and cryo-preserved. The patient is prepared by giving conditioning regimen (high dose melphelan). Stem cells, which are already collected, are re-infused into patient’s circulation by a blood transfusion set. Engraftment happens 7-14 days after auto SCT. Common side effects of this procedure include nausea, vomiting, diarrhoea, mucositis, infections etc. The first case of SCT performed in Combined Military Hospital, Dhaka, Bangladesh is presented here.Birdem Med J 2018; 8(2): 177-180

Effects of Sickle Cell Disease on Hematopoietic Stem Cell Function and the Bone Marrow Microenvironment.

Blood ◽  
2006 ◽  
Vol 108 (11) ◽  
pp. 1227-1227
Author(s):  
Elisabeth H. Javazon ◽  
Leslie S. Kean ◽  
Jennifer Perry ◽  
Jessica Butler ◽  
David R. Archer
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Stem Cell ◽  
Sickle Cell Disease ◽  
Sickle Cell ◽  
Cell Function ◽  
Donor Cell ◽  
Cell Disease ◽  
Hematopoietic Stem ◽  
Cell Engraftment

Abstract Gene therapy and stem cell transplantation are attractive potential therapies for sickle cell disease (SCD). Previous studies have shown that the sickle environment is highly enriched for reactive oxygen species (ROS), but have not addressed whether or not the increased ROS may alter the bone marrow (BM) microenvironment or affect stem cell function. Using the Berkeley sickle mouse model, we examined the effects of sickle cell disease on hematopoietic stem cell function and the bone marrow microenvironment. We transplanted C57BL/6 (control) BM into C57BL/6 and homozygous sickle mice. Recipients received 2 × 106 BM cells and a conditioning regimen consisting of busulfan, anti-asialo GM1, and co-stimulation blockade (anti-CD40L and CTLA4-Ig). Following transplantation, sickle mice demonstrated increased donor cell engraftment in the peripheral blood compared to normal mice (58.3% vs. 33.1%, respectively). Similarly, BMT in a fully allogeneic system also resulted in enhanced engraftment in sickle recipients. Next we analyzed whether or not engraftment defects exist within the BM stem cell population of sickle mice. In vitro colony forming assays showed a significant decrease in progenitor colony formation in sickle compared to control BM. By flow cytometry, we determined that there was a significant decrease in the KSL (c-Kit+, Sca-1+, Lineage−) progenitor population within the BM of sickle mice. Cell cycle analysis of the KSL population demonstrated that significantly fewer sickle KSL cells were in G0 phase compared to control, suggesting that there are fewer quiescent stem cells in the BM of sickle mice. To assess the potential role of ROS and glutathione depletion in sickle mice, we tested the engraftment efficiency of KSL cells from untreated and n-acetyl-cysteine (NAC) treated control, hemizygous sickle (hemi), and sickle mice in a competitive repopulation experiment. Peripheral chimerism showed an engraftment defect from both hemizygous and homozygous sickle mice such that control KSL cells engrafted > hemi > sickle at a ratio of 1 : 0.4 : 0.25. Treatment with NAC for four months prior to transplantation partially restored KSL engraftment (control : hemi : sickle; 1 : 0.97 : 0.56 ). We have demonstrated that congenic and allogeneic BMT into sickle mice result in increased donor cell engraftment in the sickle recipients. Both the decreased number of KSL cells and the decreased percentage of quiescent KSL cells in the sickle mice indicate that more stem cells in the transgenic sickle mouse model are mobilized from the BM environment. The engraftment defect of sickle KSL cells that was partially ameliorated by NAC treatment suggests that an altered redox environment in sickle mice may contribute to the engraftment deficiencies that we observed.

Antioxidant Treatment Rescues An Accelerated Aging Phenotype In Dyskerin Mutated Bone Marrow Stem Cells.

Blood ◽  
2010 ◽  
Vol 116 (21) ◽  
pp. 2614-2614
Author(s):  
Baiwei Gu ◽  
Jian-meng Fan ◽  
Monica Bessler ◽  
Philip J Mason
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Stem Cell ◽  
Cell Function ◽  
Bone Marrow Failure ◽  
Dyskeratosis Congenita ◽  
Untreated Group ◽  
Telomere Maintenance ◽  
Antioxidant Treatment ◽  
Transplantation Experiments

Abstract Abstract 2614 X-linked Dyskeratosis Congenita (DC) is due to mutations in the DKC1 gene, which encodes the protein dyskerin. Dyskerin is a highly conserved nucleolar protein that, as part of a specialized nucleolar RNP, catalyzes the pseudouridylation of specific residues in newly synthesized ribosomal RNAs and spliceosomal snRNAs. Dyskerin also associates with telomerase and is involved in telomere maintenance. In addition to the well known effect of telomere homeostasis on cancer, it is evident that telomere maintenance may also be important in replicative aging because of telomere shortening due to the limited expression of telomerase activity in dividing somatic cells. Accumulating evidence suggests that dysfunctional telomeres resulting in premature cellular senescence is the primary cause of bone marrow failure in dyskeratosis congenita. It is important to determine the mechanism whereby Dkc1 mutations lead to premature cellular senescence in bone marrow. We have produced a line of mice containing a mutation, Dkc1Δ15, which is a copy of a pathogenic human mutation. Male Dkc1Δ15 mice showed a decrease in the proportion of B and T lymphocytes in peripheral blood and reduced body weight with age but no overt bone marrow failure syndrome phenotypes. Our previous competitive bone marrow transplantation experiments showed that the Dkc1Δ15 mutation caused decay of stem cell function with age. Bone marrow from older Dkc1Δ15 mice was markedly inefficient in repopulation studies compared with bone marrow from age matched wild type mice. We also found that N-acetyl cysteine (NAC) could at least partially rescue the growth disadvantage of dyskerin mutant spleen cells or fibroblasts which was associated with accumulation of DNA damage and reactive oxygen species. To determine if NAC, or other antioxidants might be useful therapeutically it is important to determine their effects on stem cell function, which is defective in DC. To this end we established a cohort of mice that were given NAC in their drinking water (1mg/ml) from 3-weeks of age and maintained on NAC for 1 year. We found that long term NAC treatment did not show significant side effects on the mice. They had slightly increased neutrophils, but no difference in life span and body weight compared with the untreated group. Impressively, old male Dkc1Δ15 mice showed corrected B and T cell proportions in peripheral blood after treatment with NAC. Competitive bone marrow transplantation experiments were carried out in which a 1:1 mixture of BM cells from mutant and WT mice was used to repopulated lethally irradiated recipient mice. These experiments showed that, when taken from NAC treated animals, old Dkc1Δ15 BM cells could compete with age matched WT cells with 40–45% of Dkc1Δ15 cells in primary recipients compared with only 20% for the untreated group. Moreover, after secondary transplantation, cells from the NAC treated group still represent 15–20% of Dkc1Δ15 cells in recipients while those from the untreated group could not be detected. These results strongly suggest that NAC treatment can partially restore the bone marrow repopulating ability of Dkc1Δ15 stem cells. Together with our previous results these data suggest that a pathogenic Dkc1 mutation, through its effect on telomerase, initiates stem cell aging before telomeres are short and that increased oxidative stress might play a role in this process. Moreover the effects of the mutation may be prevented or delayed by antioxidant treatment, although the precise mechanism will be the subject of future investigation. Disclosures: Bessler: Alexion Pharmaceutical Inc: Consultancy; Novartis: Membership on an entity's Board of Directors or advisory committees; Taligen: Consultancy.

Allogeneic Haematopoietic Stem Cell Donation — Current Status with Regard to Safety

2011 ◽  
Vol 07 (03) ◽  
pp. 211
Author(s):  
Alberto Bosi ◽  
Benedetta Bartolozzi ◽  
◽  
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Stem Cell ◽  
Peripheral Blood ◽  
Haematopoietic Stem Cell ◽  
Current Status ◽  
Peripheral Blood Stem Cells ◽  
First Choice ◽  
Donation Process ◽  
Blood Stem Cells

Allogeneic haematopoietic stem cell transplantation (HSCT) represents the first choice of treatment or an important therapeutic option for numerous diseases. Several stem cell sources, such as bone marrow, mobilised peripheral blood stem cells and umbilical cord blood, are suitable for HSCT in clinical practice. However, this procedure is strongly related to availability of a histocompatible donor. In order to increase the probability of finding a histocompatible donor, national and international registries have been developed. Voluntary donation of bone marrow or peripheral blood stem cells for HSCT, both in the related or unrelated setting, is a well-established procedure with an invaluable ethical significance. Even if both procedures are safe, they are not risk free; therefore, the greatest attention has to be paid to the donor and to the donation process through a careful monitoring protocol for donor safety.

scholarly journals In vivo and in vitro stem cell function of c-kit- and Sca-1-positive murine hematopoietic cells

Blood ◽  
1992 ◽  
Vol 80 (12) ◽  
pp. 3044-3050 ◽  
Author(s):  
S Okada ◽  
H Nakauchi ◽  
K Nagayoshi ◽  
S Nishikawa ◽  
Y Miura ◽  
...  
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Stem Cell ◽  
Hematopoietic Stem Cells ◽  
Cell Function ◽  
Bone Marrow Cells ◽  
Synergistic Effects ◽  
Single Cells ◽  
Hematopoietic Stem

c-kit is expressed on hematopoietic stem cells and progenitor cells, but not on lymphohematopoietic differentiated cells. Lineage marker- negative, c-kit-positive (Lin-c-kit+) bone marrow cells were fractionated by means of Ly6A/E or Sca-1 expression. Lin-c-kit+Sca-1+ cells, which consisted of 0.08% of bone marrow nucleated cells, did not contain day-8 colony-forming units-spleen (CFU-S), but 80% were day-12 CFU-S. One hundred cells rescued the lethally irradiated mice and reconstituted hematopoiesis. On the other hand, 2 x 10(3) of Lin-c- kit+Sca-1- cells formed 20 day-8 and 11 day-12 spleen colonies, but they could not rescue the lethally irradiated mice. These data indicate that Lin-c-kit+Sca-1+ cells are primitive hematopoietic stem cells and that Sca-1-cells do not contain stem cells that reconstitute hematopoiesis. Lin-c-kit+Sca-1+ cells formed no colonies in the presence of stem cell factor (SCF) or interleukin-6 (IL-6), and only 10% of them formed colonies in the presence of IL-3. However, approximately 50% of them formed large colonies in the presence of IL-3, IL-6, and SCF. Moreover, when single cells were deposited into culture medium by fluorescence-activated cell sorter clone sorting system, 40% of them proliferated on a stromal cell line (PA-6) and proliferated for more than 2 weeks. In contrast, 15% of the Lin-c- kit+Sca-1-cells formed colonies in the presence of IL-3, but no synergistic effects were observed in combination with SCF plus IL-6 and/or IL-3. Approximately 10% proliferated on PA-6, but most of them degenerated within 2 weeks. The population ratio of c-kit+Sca-1+ to c-kit+Sca-1- increased 2 and 4 days after exposure to 5-fluorouracil (5-FU). These results are consistent with the relative enrichment of highly proliferative colony-forming cells by 5-FU. These data show that, although c-kit is found both on the primitive hematopoietic stem cells and progenitors, Sca-1+ cells are more primitive and respond better than Sca-1- cells to a combination of hematopoietic factors, including SCF and stromal cells.

scholarly journals The bone marrow stem cell niche grows up: mesenchymal stem cells and macrophages move in

2011 ◽  
Vol 208 (3) ◽  
pp. 421-428 ◽  
Author(s):  
Armin Ehninger ◽  
Andreas Trumpp
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Mesenchymal Stem Cells ◽  
Stem Cell ◽  
Cell Function ◽  
Cell Types ◽  
Nerve Fibers ◽  
Hematopoietic Stem ◽  
Sympathetic Nerve Fibers ◽  
Cell Mobilization

Stem cell niches are defined as the cellular and molecular microenvironments that regulate stem cell function together with stem cell autonomous mechanisms. This includes control of the balance between quiescence, self-renewal, and differentiation, as well as the engagement of specific programs in response to stress. In mammals, the best understood niche is that harboring bone marrow hematopoietic stem cells (HSCs). Recent studies have expanded the number of cell types contributing to the HSC niche. Perivascular mesenchymal stem cells and macrophages now join the previously identified sinusoidal endothelial cells, sympathetic nerve fibers, and cells of the osteoblastic lineage to form similar, but distinct, niches that harbor dormant and self-renewing HSCs during homeostasis and mediate stem cell mobilization in response to granulocyte colony-stimulating factor.

scholarly journals Plant stem-cell organization and differentiation at single-cell resolution

2020 ◽  
Vol 117 (52) ◽  
pp. 33689-33699
Author(s):  
James W. Satterlee ◽  
Josh Strable ◽  
Michael J. Scanlon
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Cell Differentiation ◽  
Single Cell ◽  
Cell Fate ◽  
Cell Function ◽  
Ectopic Expression ◽  
Cellular Level ◽  
Organizing Center ◽  
Cell Niche

Plants maintain populations of pluripotent stem cells in shoot apical meristems (SAMs), which continuously produce new aboveground organs. We used single-cell RNA sequencing (scRNA-seq) to achieve an unbiased characterization of the transcriptional landscape of the maize shoot stem-cell niche and its differentiating cellular descendants. Stem cells housed in the SAM tip are engaged in genome integrity maintenance and exhibit a low rate of cell division, consistent with their contributions to germline and somatic cell fates. Surprisingly, we find no evidence for a canonical stem-cell organizing center subtending these cells. In addition, trajectory inference was used to trace the gene expression changes that accompany cell differentiation, revealing that ectopic expression of KNOTTED1 (KN1) accelerates cell differentiation and promotes development of the sheathing maize leaf base. These single-cell transcriptomic analyses of the shoot apex yield insight into the processes of stem-cell function and cell-fate acquisition in the maize seedling and provide a valuable scaffold on which to better dissect the genetic control of plant shoot morphogenesis at the cellular level.

scholarly journals Defining Parameters Attributing to the Role of Osteomacs in Regulating Stem Cell Function and the Hematopoietic Niche

Blood ◽  
2018 ◽  
Vol 132 (Supplement 1) ◽  
pp. 2576-2576
Author(s):  
Safa F. Mohamad ◽  
Joydeep Ghosh ◽  
Andrea M. Gunawan ◽  
Rachel Blosser ◽  
Malgorzata Kamocka ◽  
...  
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Stem Cell ◽  
Cell Function ◽  
Single Cells ◽  
Stem Cell Differentiation ◽  
Cell Renewal ◽  
Hematopoietic Stem ◽  
Hematopoietic Niche ◽  
Hematopoietic Activity

Abstract Networking between hematopoietic stem cells (HSC) and cells of the hematopoietic niche is critical for the maintenance of stem cell renewal and function. HSC maintenance in the hematopoietic niche is considered to be the product of intimate interactions between cellular and soluble elements of the niche and stem cells. Among the cellular components of the niche participating in this function are a group of specialized bone-resident macrophages known as osteomacs (OM). Previously, we established the importance of osteoblasts (OB) in hematopoiesis and quite recently, we described the importance of OM and their interactions with OB and megakaryocytes (MK) in sustaining HSC function. We have also illustrated that CD166 is a critical functional marker of stem cell function and competence of the hematopoietic niche. Interestingly, immature OB which are CD166+ mediate the highest level of hematopoietic enhancing activity. We report here the importance of CD166 on calvarie-resident OM (identified as CD45+F4/80+ cells) and outline how these cells require cooperation from MK to increase CD166 expression and sustain HSC function. Bone resident-osteomacs, which are phenotypically similar but functionally different from bone marrow-derived macrophages, were collected by the enzymatic digestion of neonatal calvarial cells (NCC) or long bones of adult mice. Transplantation assays indicated that OM are relatively radioresistant and survive several weeks post lethal radiation. However, they eventually deplete and are replenished by progeny of donor HSC. To understand the importance of OM-OB-MK interactions in maintaining HSC function in the niche, we performed 3D cytometry on fixed and stained bone marrow sections that revealed intimate spatial interactions between OM, OB, MK and HSC. To assess changes in gene expression observed due to these interactions, we cultured NCC for 16hr in the absence or presence of MK prepared from fetal liver followed by sorting out OM from each group. These cells were then captured as single cells and sequenced to identify potential targets through which OM enhanced hematopoietic activity. Strikingly, several genes involved in the hematopoietic stem cell differentiation pathway including lmo2, fli1 and ikzf1 were upregulated in OM cultured in the presence of MK. Other genes that were upregulated were embigin and PF-4, both of which have been implicated in the maintenance of HSC function. Interestingly, OM express embigin, angiogenin and IL-18 mRNA similar to proximal osteolineage cells which we previously described as HSC regulators. To investigate changes at the translational level, we performed single cell proteomics using CyTOF. NCC were cultured for 2 days in the absence and presence of MK followed by staining for a panel of 29 surface and intracellular markers. Expression of markers such as CD166, embigin, mac-2 and STAT3 amongst others was elevated on OM cultured with MK compared to OM cultured without. These data informed our decision to focus our future investigations on CD166 and embigin. Next CD166+OM and CD166-OM were isolated by cell sorting and used in co-culture assays with OB to support the production of clonogenic cells in vitro. Only the CD166+ fraction of OM maintained hematopoietic activity similar to unsorted OM, implicating CD166 as one of the mediators of OM function. These results were validated using recombinant CD166 protein to substitute for OM function. Under these conditions, recombinant CD166 supported the hematopoietic enhancing activity of OB in the absence of OM. Recombinant Angiogenin and IL-18 were unable to augment the CD166-mediated support of hematopoiesis. Interestingly, CD166 knockout OM were unable to mediate the same hematopoietic enhancing activity observed with WT OM regardless of the presence or absence of MK in culture. In vivo transplantation studies to corroborate these findings have been initiated and are very early to yield meaningful conclusions. These data demonstrate that CD166 is one of the important mediators through which OM maintain HSC function. However, CD166-OM mediated HSC function is only maintained in conjunction with OB-MK interactions. Our data indicate the importance of crosstalk between OM, OB and MK which leads to the expression of novel mediators such as CD166 to support HSC function. Disclosures No relevant conflicts of interest to declare.

The Use of Plerixafor for Peripheral Blood Stem Cell Mobilisation Reduces the Frequency of Mobilisation Failure in Patients Planned to Undergo Autologous Transplantation

2010 ◽  
Vol 00 (04) ◽  
pp. 24 ◽  
Author(s):  
Dag Josefsen ◽  
Catherine Rechnitzer ◽  
Katriina Parto ◽  
Gunnar Kvalheim ◽  
◽  
...  
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Peripheral Blood ◽  
Autologous Transplantation ◽  
Case Series ◽  
High Dose Chemotherapy ◽  
Haematopoietic Stem Cell ◽  
High Dose ◽  
Haematopoietic Stem Cells ◽  
Stem Cell Mobilisation

High-dose chemotherapy with or without radiation followed by autologous haematopoietic stem cell transplantation (auto-HSCT) is now the standard of care for patients with chemosensitive relapsed aggressive non-Hodgkin’s lymphoma (NHL), chemosensitive relapsed Hodgkin’s disease (HD) and multiple myeloma (MM). Autologous haematopoietic stem cells also provide haematopoietic support after the administration of high-dose chemotherapy in relapsed NHL and MM. However, certain patients fail to mobilise a sufficient number of haematopoietic stem cells using standard cytokine-assisted mobilisation strategies. Recently, plerixafor, a novel bicyclam capable of specifically and reversibly binding to the CXCR4 receptor on haematopoietic stem cells, has been granted European approval, in combination with granulocyte colony-stimulating factor, for the enhancement of haematopoietic stem cell mobilisation to the peripheral blood for collection and subsequent autotransplantation in poorly mobilising lymphoma and MM patients. In this article the authors present their initial experience with plerixafor in a case series at their own institutions in Scandinavia.

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