Rapamycin delays xenogeneic acute graft-versus-host disease (aGvHD) in NOD/SCID/IL2Rg NULL (NSG) mice: impact of regulatory T cells

Poster (2011)

Longitudinal Monitoring of Immune Reconstitution After Allogeneic Peripheral Blood Stem Cell Transplantation (HSCT): Impact of T Cell Depletion of the Graft

in Belgian Journal of Hematology (2011), Abstracts book(Supplement of 26th General Meeting of the Belgian Hematological Society), 31

Effects of granulocyte-colony-stimulating factor on progenitor cell mobilization and heart perfusion and function in normal mice

in Cytotherapy (2011), 13

Lymphome du manteau : prise en charge 2011

in Revue Médicale Suisse (2011), 7

Le lymphome du manteau (LM) représente 6% des lymphomes non hodgkiniens (LNH). Le diagnostic repose sur l'immunophénotypage et la démonstration de la présence de la location entre les chromosomes 11 et 14 ... [more ▼]

Le lymphome du manteau (LM) représente 6% des lymphomes non hodgkiniens (LNH). Le diagnostic repose sur l'immunophénotypage et la démonstration de la présence de la location entre les chromosomes 11 et 14, avec surexpression de la cycline D1. Le traitement de première ligne du sujet jeune associe trois cures de R-CHOP21 alternées avec trois cures de R-DHAP21, suivies d'une autogreffe conditionnée par irradiation corporelle totale, cyclophosphamide et aracytine. Le sujet de plus de 65 ans peut bénéficier de huit cures de R-CHOP21. L'intérêt du traitement de maintenance est en cours d'évaluation. L'allogreffe de cellules souches hématopoïétiques offre une chance de guérison aux patients en rechute en bon état général. Les traitements ciblés permettront une amélioration du pronostic de cette maladie. [less ▲]

Allogeneic hematopoietic stem cell transplantation (HSCT) after reduced intensity conditioning

in Transfusion & Apheresis Science (2011), 44

Allogeneic hematopoietic stem cell transplantation (HSCT) following myeloablative (conventional) conditioning regimen is associated with a high incidence of transplant-related morbidity and mortality ... [more ▼]

Allogeneic hematopoietic stem cell transplantation (HSCT) following myeloablative (conventional) conditioning regimen is associated with a high incidence of transplant-related morbidity and mortality, limiting its use to younger patients without medical co-morbidities. Over the past few years, it has become more evident that the alloreactivty of transplanted donor immunocompetent cells against host tumor cells (graft-versus-tumor effects, GVT effects) plays a major role in eradicating malignancies after allogeneic HSCT. Based on these observations, several groups of investigators have developed reduced intensity conditioning (RIC) regimens allowing patients who are ineligible for conventional HSCT to benefit from the potentially curative GVT effects of allogeneic transplantation. Retrospective studies have suggested that, in comparison with myeloablative allogeneic HSCT, in patient aged 40-60 years, RIC HSCT was associated with a higher risk of relapse but a lower incidence of transplant-related mortality leading to similar progression-gree and overall survivals. Prospective studies are ongoing to define which patients might most benefit from RIC HSCT, and to increase the anti-tumoral activity of the procedure while reducing the incidence and the severity of acute graft-versus-host disease (GVHD). In this article, we review the current status and perspectives of RIC HSCT. [less ▲]

Prise en charge actuelle des syndromes myélodysplasiques

in Revue Médicale Suisse (2011), 7

Expression of components of the growth hormone (GH)/insulin-like growth factor (IGF) axis during Balb/c mouse thymus ontogeny and effects of GH upon ex-vivo T-cell differentiation

Poster (2010, September)

Elevations of tumor necrosis factor-receptor-1 at day 7 and acute graft-versus-host disease after allogeneic hematopoietic cell transplantation with nonmyeloablative conditioning

in Bone Marrow Transplantation (2010), 45

GVHD chronique et effet anti-tumoral

in Correspondance en Onco-Hématologie (2010), 5

It was demonstrated in 1981 that chronic GVHD was associated with a strong decrease of the relapse risk after conventional allogeneic hematopoietic cell transplantation (graf-versus-tumor effects). Recent ... [more ▼]

It was demonstrated in 1981 that chronic GVHD was associated with a strong decrease of the relapse risk after conventional allogeneic hematopoietic cell transplantation (graf-versus-tumor effects). Recent studies suggest that chronic GVHD might also been associated with improved progression-gree survival after allogeneic hematopoietic cell transplantation with reduced-intensity conditioning (RIC-allo), a transplant strategy based mainly on graft-versus-tumor effects for tumor eradication. Further, it has been demonstrated that elimination of leukemic cells after RIC-allo is due to donor T-cell cloones directed against multiple minor histocompatibility antigens (specific for the recipient) that are largely expressed not only by tumor cells but also by non-hematopoietic tissues, explaining the strong association between GVHD and graft-versus-tumor effects seen after RIC-allo. [less ▲]

Prolonged ex vivo culture of human bone marrow mesenchymal stem cells influences their supportive activity toward NOD/SCID -repopulating cells and committed progenitor cells of B lymphoid and myeloid lineages

in Haematologica (2010), 95(1), 47-56

Background Bone marrow (BM) mesenchymal stem cells (MSC) support proliferation and differentiation of hematopoietic progenitor cells (HPC) in vitro. Since they represent a rare subset of BM cells, MSC ... [more ▼]

Background Bone marrow (BM) mesenchymal stem cells (MSC) support proliferation and differentiation of hematopoietic progenitor cells (HPC) in vitro. Since they represent a rare subset of BM cells, MSC preparations for clinical purposes involves a preparative step of ex vivo multiplication. The aim of our study was to analyze the influence of culture duration on MSC supportive activity. DESIGN AND METHODS: MSC were expanded for up to 10 passages. MSC and CD34(+) cells were seeded in cytokine-free co-cultures after which the phenotype, clonogenic capacity and in vivo repopulating activity of harvested hematopoietic cells were assessed. RESULTS: Early passage MSC supported HPC expansion and differentiation toward both B lymphoid and myeloid lineages. Late passage MSC did not support HPC and myeloid cell outgrowth but maintained B cell supportive ability. In vitro maintenance of NOD/SCID mouse repopulating cells cultured for one week in contact with MSC was effective until the fourth MSC passage and declined afterwards. CD34(+) cells achieved higher levels of engraftment in NOD/SCID mice when co-injected with early passage MSC; however MSC expanded beyond 9 passages were ineffective in promoting CD34(+) cell engraftment. Non-contact cultures indicated that MSC supportive activity involved diffusible factors. Among these, interleukin (IL)-6 and IL-8 contributed to the supportive activity of early passage MSC but not of late passage MSC. MSC phenotype as well as fat, bone and cartilage differentiation capacity did not change during MSC culture. Conclusions Extended MSC culture alters their supportive ability toward HPC without concomitant changes in phenotype and differentiation capacity. [less ▲]