Eun-sun Yoo

Hematopoiesis depends on the association of hematopoietic stem cells with stromal cells that constitute the hematopoietic microenvironment. The in vitro development of the endothelial cell from umbilical cord blood (UCB) is not well established and has met very limited success. In this study, UCB CD34(+) cells were cultured for 5 weeks in a stroma-free liquid culture system using thrombopoietin, flt3 ligand, and granulocyte-colony stimulating factor. By week 4-5, we found that firmly adherent fi

Sets of sialic acid-containing trisaccharides having different internal and terminal linkages have been synthesized to develop a sensitive method for analysis of the reducing terminal linkage positions. The trisaccharides, sialyl(<TEX>$\alpha$</TEX> 2-3)Gal(<TEX>$\beta$</TEX> 1-3)GalNAc and sialyl(<TEX>$\alpha$</TEX> 2-3)Gal(<TEX>$\beta$</TEX> 1-X)GlcNAc where X=3, 4 and 6, were synthesized and examined using electrospray ionization (ESI)-collision induced dissociation (CID) tandem mass spectrom

Neutropenia is defined as an absolute neutrophil count (ANC) of ＜1,500/µL, and the severity of neutropenia generally can be graded as mild (1,000-1,500/µL), moderate (500-1,000/µL), or severe (＜500/µL). This stratification aids in predicting the risk of pyogenic infection because the susceptibility to life-threatening infections is significantly increased in patients with prolonged episodes of severe neutropenia. Especially cancer-related neutropenia carry significant mortality. Neutropenia can

Negative ion fast atom bombardment (FAB) mass spectra were found to allow the determination of the linkage positions in a series of underivatized linkage-isomeric oligosaccharides. A previous work (Laine et al., 1988) reported that ion patterns of linkage-isomeric trisaccharides could be distinguished by a positive ion. Negative ion FAB collison-activated dissociation (CAD) mass spectrometry (MS) spectra of trisaccharides exhibited better sensitivity than the positive ion mode and provided speci

The infection of pandemic influenza viruses such as swine flu (H1N1) and avian flu viruses to the host cells is related to the following two factors: First, the surface protein such as HA (hemagglutinin) and NA (neuraminidase) of the influenza virus. Second, the specific structure of the oligosaccharide [sialic acid(alpha2-6) galactose(beta1-4)glucose or sialic acid(alpha2-3)galactose(beta1-4)glucose] on the host cell. After recognizing the specific structure of the oligosaccharide on the surfac

Abstract Abstract 1445 Poster Board I-468 Purpose VEGF is a key angiogenic growth factor stimulating proliferation, migration, and tube formation on endothelial cells (ECs), that works through the VEGF receptor type 2 (VEGR2, KDR/Flk1). Reactive oxygen species (ROS) such as superoxide and H2O2 have roles signaling for molecules on angiogenesis. In present study, the aim is to investigate the roles of reactive oxygen species on neovascularization in endothelial progenitor cells. Methods Mononucle

Energy minimization and conformational studies of molecular ions generated by ESI (electrospray ionization) tandem mass spectrometry (MS/MS) can be used for the discrimination of stereoisomeric permethylated and sodium cationized trisaccharides. Sets of fucose-containing trisaccharides having different internal and terminal linkages have been synthesized to analyze the reducing terminal linkage positions using BT and IT fusion approaches. A detailed investigation has been undertaken on the confo

The interaction between viral HA (hemagglutinin) and oligosaccharide of the host plays an important role in the infection and transmission of avian and human flu viruses. Until now, this interaction has been classified by sialyl(α2-3) or sialyl(α2-6) linkage specificity of oligosaccharide moieties for avian or human virus, respectively. In the case of H5N1 and newly mutated flu viruses, classification based on the linkage type does not correlate with human infection and human-to-human transmissi

Abstract Abstract 5141 Incorporation of bortezomib in the treatment of multiple myeloma (MM) has significantly imporved patient outcome. Because peripheral neuropathy (PN) leading to dose modification and drug discontinuation seems to be dependent on dose and exposure of bortezomib, some schedules of botezomib therapy were reduced from twice-weekly to once-weekly infusion. We assessed the efficacy and safety of once-weekly bortezomib infusion in the treatment of relapsed/refractory MM. We compar

Abstract Backgroud: Human umbilical cord blood (UCB) contains a high number of endothelial progenitor cells (EPCs) and may be useful for the treatment of ischemic disease. Recently, we have isolated EPCs from UCB having different biologic properties for angiogenic capabilities in vitro. In this present study, the aim is to examine the usefulness of OECs in hind-limb ischemia. Methods: Mononuclear cells from UCB cultured using EGM-2 medium with VEGF, IGF-1 and FGF for 21 days. Early spindle-shape

Abstract Abstract 3714 Hematopoietic stem and progenitor cell (HSC/HPC) trafficking into the bone marrow during hematopoietic stem cell transplantation (HSCT) is thought to be an important biological step that can be targeted to improve transplant efficiency and subsequent immune reconstitution. It has been reported that loss/inhibition of the peptidase CD26, also known as DPPIV (dipeptidylpeptidase IV), increases the transplant efficiency of mouse HSC/HPC (Christopherson, KW 2nd, et al. Science

Abstract Abstract 1114 Poster Board I-136 Background : It has been proposed that treating cancer cells with vectors that cause the over expression of MnSOD and catalase could inhibit tumor cell growth by disrupting the redox signaling involved with cell division as well as, therapeutically, by providing protection for normal cells. These results support the hypotheses that increasing the dismutation of mitochondrial superoxide alters redox signaling in cancer cells that can result in growth supp

Abstract Abstract 5188 Background: Reactive oxygen species (ROS) such as superoxide and H2O2 have roles signaling for molecules on angiogenesis. NADPH oxidase Nox2 (gp91phox) is a major source of ROS. Previous, we had found that Nox2-based NADPH oxidase (gp91phox)-induced ROS may play important roles on EPCs migration and proliferation by VEGF (Blood. 2009;114:Abstract 1445). In the present study, we studied the impact of down-regulation of Nox2 on intracellular ROS level, proliferation, transmi

Abstract Though we were able to shorten the CD34+ cell mobilization by 24~48h by using continuous intravenous rhG-CSF rather than SQ rhG-CSF, it still will take several days when used normal individuals (Lee et al, BMT2005, 36:1027–1031). Previously we had reported that LT(Leukotriene)B4 was able to mobilize HSC in the murine model within 4 hours without significant side effects(ASH 2005). However, because there are possibilities of similar mechanisms during the HSC mobilization, which are share