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Human Umbilical Cord Blood (human + umbilical_cord_blood)
Selected AbstractsORIGINAL ARTICLE: Isolation of Non-Activated Monocytes from Human Umbilical Cord BloodAMERICAN JOURNAL OF REPRODUCTIVE IMMUNOLOGY, Issue 1 2010Erik Normann Problem, Methods for monocyte purification are common but few work with umbilical cord monocytes that do not activate the cell for subsequent culture analysis. Methods of study, The collection procedure avoids use of needles and procedures that variably activate blood clotting and uses a purification procedure that involves diluted Ficoll, autologous serum to remove platelets and 42% and 51% Percoll step gradients for the final purification. The resulting monocytes were stimulated with bacterial lipopolysaccharide and formalin-treated bacteria Escherichia coli and group B streptococci (GBS) to secrete TNF-, and IL-1,, measured by ELISA. Results, The purification procedure results in non-active but stimulation-competent monocytes with high yields (2.3,9 × 107 cells) and purity (from 70% to 98%). Conclusion, We describe a procedure that is easy, uses common reagents and provides a uniformly high yield and purity of non-activated fetal monocytes for studies of innate defense responses. [source] Transplantation of umbilical cord blood-derived endothelial progenitor cells: a promising method of therapeutic revascularisationEUROPEAN JOURNAL OF HAEMATOLOGY, Issue 1 2006Lei Zhang Abstract:, Therapeutic neovascularisation by endothelial progenitor cells (EPCs) mediated vascular regeneration is becoming a novel option for the treatment of ischaemic diseases. Recently, human umbilical cord blood (CB) has been found to contain a large number of EPCs and transplantation of CB EPCs led to a successful salvage of the ischaemic limbs through improvement in blood perfusion, indicating the feasibility of using CB cells for therapeutic revascularisation. This review will summarise recent studies in therapeutic revascularisation using CB cells and discuss the potential clinical utilisation of CB cells in ischaemic diseases. [source] Potential of umbilical cord blood cells for brain repairJOURNAL OF NEUROCHEMISTRY, Issue 2002P. R. Sanberg Our laboratory is characterizing the mononuclear cells from human umbilical cord blood (HUCB) for possible therapeutic value. Studies on HUCB cells demonstrated their ability to respond to growth factors by increased expression of neural markers and down regulation of several genes associated with development of blood lines. HUCB cells were also transplanted into the subventricular zone of the developing rat brain. It was found that some of the HUCB cells responded to external factors and were able to adopt neural fates similar to endogenous stem cells. We also tested whether intravenously infused HUCB cells enter brain, survive, differentiate and improve neurological functional recovery after stroke or traumatic brain injury (TBI) in rats. HUCB cells were injected into the tail vein at least 24 h after stroke or TBI. Behavioral impairments were significantly improved as early as 14 days in both TBI and stroke animals, compared to controls. Injected cells entered brain and migrated into the parenchyma of the injured brain. Some of these expressed neuronal, astrocytic, or endothelial markers. Our data suggest that intravenous administration of HUCB cells can provide neural stem cells, and may be a useful treatment for brain repair. Acknowledgements:, Supported by Saneron CCEL Therapeutics, Inc. and a FL Hi-Tech Corridor Grant. [source] Analysis of neural potential of human umbilical cord blood,derived multipotent mesenchymal stem cells in response to a range of neurogenic stimuliJOURNAL OF NEUROSCIENCE RESEARCH, Issue 9 2008Isabel Zwart Abstract We investigated the neurogenic potential of full-term human umbilical cord blood (hUCB),derived multipotent mesenchymal stem cells (MSCs) in response to neural induction media or coculture with rat neural cells. Phenotypic and functional changes were assessed by immunocytochemistry, RT-PCR, and whole-cell patch-clamp recordings. Naive MSCs expressed both mesodermal and ectodermal markers prior to neural induction. Exposure to retinoic acid, basic fibroblast growth factor, or cyclic adenosine monophosphate (cAMP) did not stimulate neural morphology, whereas exposure to dibutyryl cAMP and 3-isobutyl-1-methylxanthine stimulated a neuron-like morphology but also appeared to be cytotoxic. All protocols stimulated increases in expression of the neural precursor marker nestin, but expression of mature neuronal or glial markers MAP2 and GFAP was not observed. Nestin expression increases were serum level dependent. Electrophysiological properties of MSCs were studied with whole-cell patch-clamp recordings. The MSCs possessed no ionic currents typical of neurons before or after neural induction protocols. Coculture of hUCB-derived MSCs and rat neural cells induced some MSCs to adopt an astrocyte-like morphology and express GFAP protein and mRNA. Our data suggest hUCB-derived MSCs do not transdifferentiate into mature functioning neurons in response to the above neurogenic protocols; however, coculture with rat neural cells led to a minority adopting an astrocyte-like phenotype. © 2008 Wiley-Liss, Inc. [source] Insights into human CD34+ hematopoietic stem/progenitor cells through a systematically proteomic survey coupled with transcriptomePROTEINS: STRUCTURE, FUNCTION AND BIOINFORMATICS, Issue 9 2006Feng Liu Abstract Hematopoietic stem cells are capable of self-renewal and differentiation into different hematopoietic lineages. To gain a comprehensive understanding of hematopoietic stem/progenitor cells, a systematic proteomic survey of human CD34+ cells collected from human umbilical cord blood was performed, in which the proteins were separated by 1- and 2-DE, as well as by nano-LC, and subsequently identified by MS. A total of 370,distinct proteins identified from those cells provided new insights into the potential of the stem/progenitor cells because the nerve, gonad, and eye-associated proteins were reliably identified. Interestingly, the transcripts of 133 (35.9%) identified proteins were not found by the prevalent transcriptome approaches, although several selected transcripts could be detected by RT-PCR. Moreover, the heterogeneity of 33,proteins identified from 2-DE was attributable primarily to post-translational processes rather than to alternative splicing at transcriptional level. Furthermore, the biosyntheses of 15,proteins identified in this study appears not to be completely interrupted in spite of the fact that corresponding antisense RNAs were found in the existing transcriptome data. The integrated proteomic and transcriptomic analyses employed here provided a unique view of the human stem/progenitor cells. [source] MicroRNA-21 expression in neonatal blood associated with antenatal immunoglobulin E production and development of allergic rhinitisCLINICAL & EXPERIMENTAL ALLERGY, Issue 10 2010R.-F. Chen Summary Background The prevalence of allergic diseases has increased in the past decades. It is unknown whether expression of certain microRNAs (miRNAs) in neonatal leucocytes is correlated to IgE production and/or allergic diseases. Objective This study investigated the association of miRNA expression in neonatal leucocytes with cord blood IgE (CBIgE) elevation and development of allergic disease. Methods We screened for the expression of a panel of 157 miRNAs in mononuclear leucocytes from human umbilical cord blood (CB) samples with elevated CBIgE and tracked the association of down-regulated miRNA expression to the miRNA-targeted gene expression and to children with allergic rhinitis (AR). Results Among the initial screen of 10 CB samples with elevated CBIgE, expression of eight of the 157 miRNAs was low. Of these eight down-expressed miRNAs, three remained down-regulation in a validation with other 20 CB samples, and two of the three miRNAs, miR-21 and miR-126, were significantly lower in monocytes from AR children. Further analysis of mRNA expression of the miR-21-targeted genes identified that TGFBR2 expression on monocytes was significantly up-regulated in CB with elevated CBIgE, and in AR patients. Transfection of miR-21 precursor into monocytes from patients with AR increased miR-21 expression and decreased TGFBR2 expression. Conclusion This study demonstrated the first in the literature that lower miR-21 expression in CB and increased TGFBR2 expression is associated with antenatal IgE production and development of AR. Cite this as: R.-F. Chen, H.-C. Huang, C.-Y. Ou, T.-Y. Hsu, H. Chuang, J.-C. Chang, L. Wang, H.-C. Kuo and K. D. Yang, Clinical & Experimental Allergy, 2010 (40) 1482,1490. [source] | |||||||||||||