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Eur J Immunol. 2000 Oct;30(10):2954-61.
Reversible expression of tryptases in continuous L138.8A mast cells.

Rupp B, Lohning M, Werenskiold AK.

Institut fur Allgemeine Pathologie und Pathologische Anatomie der Technischen Universitat, Munchen, Germany.

It has been established that mast cells can alter their expression of granule chymases and tryptases in vivo. In vitro, a reversible cytokine regulation has so far only been demonstrated for chymases. We now show a reversible and cytokine-regulated expression of the tryptases MMCP-6 and MMCP-7 and of the chymases MMCP-1, MMCP-2 and MMCP-4 in the continuous murine mast cell line L138.8A. The L138.8A mast cells lacked expression of mRNA for mast cell-specific proteases when cultured in IL-3, and only 49% and 41% of the cells were c-kit+ and FcepsilonRI+, respectively, by flow cytometry. Kit-ligand/stem cell factor induced synthesis of the chymase MMCP-4 and the tryptases MMCP-6 and MMCP-7 and increased the fraction of c-kit+ and FcepsilonRI+ L138.8A cells to >70%. Kit-ligand-induced tryptase expression was suppressed in the presence of IL-3 or IL-9, and reversed after withdrawal of kit-ligand. IL-9 or IL-3/IL-10 promoted the formation of Alcian blue+ granules and increased the fraction of c-kit+ and FcepsilonRI+ L138.8A cells to >90%. IL-9 further induced the expression of the chymases MMCP-1, MMCP-2 and MMCP-4. Thus, the immature mast cell line L138.8A has the capacity to modulate both tryptase and chymase expression and represents the first model system to analyze the molecular regulation of tryptase expression in vitro.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11069078&dopt=Abstract

Haematologica. 2000 Nov;85(11):1165-71.
Allogeneic peripheral blood stem cell transplantation with CD34+-cell selection and delayed T-cell add-back in adults. Results of a single center pilot study.

Martino R, Martin-Henao G, Sureda A, Altes A, Canals C, Brunet S, Sierra J.

Servei d'Hematologia Clinica, Hospital de la Santa Creu i Sant Pau, Av. Sant Antoni M feminine Claret, 167, 08025 Barcelona, Spain. rmartinsp.santpau.es

BACKGROUND AND OBJECTIVES: Allogeneic peripheral blood stem cell transplantation with CD34+ cell-selection (CD34+-PBSCT) allows rapid hematologic engraftment with a reduction in graft-versus-host disease (GVHD), although concerns exist regarding the increased risk of tumor relapse associated with T-cell depletion of the graft. Delayed T-cell add-back (TCAB) after such transplants may restore the graft-versus-tumor effect while achieving a reduced early transplant-related mortality due to less GVHD in a group of patients at high risk of early death (i.e., age >= 45 years). DESIGN AND METHODS: Ten patients 45 years of age or older with hematologic malignancies received a CD34+-PBSCT and cyclosporin A (CyA) to prevent acute GVHD, followed by a planned delayed donor TCAB of 107 T-cells/kg to restore the graft-versus-tumor effect. The infused graft included a median of 6.3x106 CD34+ cells/kg and 4.4x104 CD3+ cells/kg. RESULTS: Engraftment was prompt in all cases. Four patients developed acute GVHD after the CD34+-PBSCT and/or chronic GVHD after CyA withdrawal and did not proceed to TCAB, and two patients died early before the planned TCAB. Four patients proceeded to TCAB at a median of day +104 after CD34+-PBSCT (+92 to +150). Two of these patients developed acute GVHD grades I-II (IBMTR Index B) after TCAB and all four developed chronic GVHD, which was extensive in two. With a median follow-up of 611 days (range 499-847) after transplant in the seven survivors, there have been no disease progressions, and all patients show a pattern of complete donor chimerism in bone marrow and peripheral blood. INTERPRETATIONS AND CONCLUSIONS: The results of our pilot study suggest that this protocol produces an acceptable transplant-related morbidity and mortality in patients 45 years and older. However, there may be benefit in infusing CD34+-selected PBSCT with even lower T-cell contents and further delaying the TCAB.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11064469&dopt=Abstract

Oncogene. 2000 Oct 26;19(45):5134-41.
AP-1 complex is effector of Hox-induced cellular proliferation and transformation.

Krosl J, Sauvageau G.

Laboratory of Molecular Genetics of Hemopoietic Stem Cells, Clinical Research Institute of Montreal, Montreal, Quebec, Canada H2W 1R7.

Hox gene products, initially characterized as master regulators of embryonic patterning, are also required for proper functioning of adult tissues. There is also a growing body of evidence that links Hox proteins to regulation of cellular proliferation/transformation. However, the underlying molecular mechanisms of Hox-associated transformation and tissue growth have yet to be elucidated. Using a well established model system for studying changes in cellular proliferation induced by Hoxb4, we show that AP-1 activity is markedly increased in Hoxb4-transduced cells due to significant upregulation of Jun-B and Fra-1 protein levels. Furthermore, we also show that the specific changes in AP-1 protein expression are necessary for the proliferation effects induced by Hoxb4, and that these changes converge to increase levels of cyclin D1, a known integrator of proliferation signals. Our observations thus link Hox gene products with key elements of the cell cycle machinery.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11064450&dopt=Abstract

Leukemia. 2000 Nov;14(11):1944-53.
Successful short-term ex vivo expansion of NOD/SCID repopulating ability and CAFC week 6 from umbilical cord blood.

Kusadasi N, van Soest PL, Mayen AE, Koevoet JL, Ploemacher RE.

Institute of Hematology, Erasmus University Rotterdam, The Netherlands.

In view of the limited potential for rapid hematological recovery after transplantation of umbilical cord blood cells (UCB) in adults, we have attempted to expand CD34+ selected hemopoietic stem cells (HSC) and progenitors in 2-week cultures of whole graft pools in the presence or absence of serum and stromal layers, and with various cytokine combinations including (1) FL + TPO; (2) FL + TPO plus SCF and/or IL6; or (3) SCF + IL6. Both in the input material and cultured grafts we determined the number of colony-forming cells (CFC), cobblestone area forming cells (CAFC), the NOD/SCID repopulating ability (SRA), and CD34+ CD38- subset by phenotyping. The highest fold-increase obtained for the number of nucleated cells (nc), CD34+, CD34+ CD38 cell numbers and CFC content was, respectively, 102 +/- 76, 24 +/- 19, 190 +/- 202 and 53 +/- 37 for stroma-free and 315 +/- 110, 25 +/- 3, 346 +/- 410 and 53 +/- 43 for stroma-supported cultures. CAFC week type 6 was maximally 11-fold expanded both under stroma-free and stroma-supported conditions. The FBMD-1 stromal cells supported a modest expansion of CD34+ CD38- cells (27 +/- 18-fold) and nc (6 +/- 4-fold), while a loss of CFC and CAFC subsets was observed. The stromal cells synergized with FL + TPO to give the highest expansion of hemopoietic progenitors. Stromal support could be fully replaced by complementing the FL + TPO stimulated cultures with SCF + IL6. FL + TPO were required and sufficient to give a 10- to 20-fold expansion of the ability of CD34+ UCB cells in 2-week cultures to engraft the BM of NOD/SCID mice. Stromal support, or complementation of the medium with SCF + IL6, did not significantly improve the in vivo engraftment potential. If the SRA and CAFC week 6 assays are accepted as tentative estimates of in vivo engrafting stem cells in humans, our findings may assist in the preparation of UCB grafts to meet the requirements for improved repopulation in the clinical setting.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11069030&dopt=Abstract

J Exp Med. 2000 Nov 6;192(9):1273-80.
Age-associated characteristics of murine hematopoietic stem cells.

Sudo K, Ema H, Morita Y, Nakauchi H.

Department of Immunology, Institute of Basic Medical Sciences, University of Tsukuba and Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation, Tsukuba, Japan.

Little is known of age-associated functional changes in hematopoietic stem cells (HSCs). We studied aging HSCs at the clonal level by isolating CD34(-/low)c-Kit(+)Sca-1(+) lineage marker-negative (CD34(-)KSL) cells from the bone marrow of C57BL/6 mice. A population of CD34(-)KSL cells gradually expanded as age increased. Regardless of age, these cells formed in vitro colonies with stem cell factor and interleukin (IL)-3 but not with IL-3 alone. They did not form day 12 colony-forming unit (CFU)-S, indicating that they are primitive cells with myeloid differentiation potential. An in vivo limiting dilution assay revealed that numbers of multilineage repopulating cells increased twofold from 2 to 18 mo of age within a population of CD34(-)KSL cells as well as among unseparated bone marrow cells. In addition, we detected another compartment of repopulating cells, which differed from HSCs, among CD34(-)KSL cells of 18-mo-old mice. These repopulating cells showed less differentiation potential toward lymphoid cells but retained self-renewal potential, as suggested by secondary transplantation. We propose that HSCs gradually accumulate with age, accompanied by cells with less lymphoid differentiation potential, as a result of repeated self-renewal of HSCs.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11067876&dopt=Abstract

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