نتایج جستجو برای: سلولهای cd34
تعداد نتایج: 15166 فیلتر نتایج به سال:
We present cell cycling and functional evidence that the CD34+CD38- immunophenotype can be used to define a rare and primitive subpopulation of progenitor cells in umbilical cord blood. CD34+CD38- cells comprise 0.05% +/- 0.08% of the mononuclear cells present in cord blood. Cell cycle analysis with the fluorescent DNA stain 7-aminoactinomycin D showed that the percentage of CD34+ cells in cycl...
cd34 is a type i membrane protein with a molecular mass of approximately 110 kda. this antigen is associated with human hematopoietic progenitor cells and is a differentiation stage-specific leukocyte antigen. in this study we have generated and characterized monoclonal antibodies (mabs) directed against a cd34 marker. mice were immunized with two keyhole lympet hemocyanin (klh)-conjugated cd34...
زمینه و هدف: سلول های بنیادی فولیکول مو چند توان هستند و چندین نوع سلول بنیادی در ناحیه بالج فولیکول مو شناسایی شده است. جداسازی دقیق سلول های بنیادی فولیکول مو با استفاده از مارکرهای سطحی یکی از روش های مناسب جهت جایگزینی روش های جداسازی قدیمی محسوب می شود. در این مطالعه از روش جداسازی سلول در میدان آهنربایی برای جداسازی سلول های بنیادی فولیکول مو استفاده شده است. روش کار: در این مطالع...
Hematopoietic stem cells (HSCs) possess both self-renewal and multi-lineage differentiation abilities and maintain lifelong hematopoiesis. Recent studies have revealed that the murine HSC compartment consists of heterogeneous HSC subpopulations in terms of their lineage-biased differentiation potentials. Dykstra et al. have recently categorized murine HSCs as α-, β-, γand δ-cells, according to ...
Hematopoietic progenitor cells migrate in vitro and in vivo towards a gradient of the chemotactic factor stromal cell-derived factor-1 (SDF-1) produced by stromal cells. This is the first chemoattractant reported for human CD34 1 progenitor cells. Concentrations of SDF-1 that elicit chemotaxis also induce a transient elevation of cytoplasmic calcium in CD34 1 cells. SDF-1-induced chemotaxis is ...
In the absence of conclusive assays capable of determining the functionality of ex vivo expanded human hematopoietic progenitor cells, we combined cell tracking with the membrane dye PKH2, immunostaining for CD34, and limiting dilution analysis to estimate the frequency of long-term hematopoietic culture-initiating cells (LTHC-ICs) among de novo-generated CD34+ cells. Umbilical cord blood (CB) ...
Compared to murine models, data on cells responsible for the homeostasis of human epidermis are scarce and often contradictory. Given the conflicting results and the availability of clinical grade protocols to purify CD34 cells from a given tissue, we pursued to phenotypically characterize human epidermal CD34+ population. After magnetic separation of whole skin CD34+ and CD34- cell fractions a...
Translocation of the mixed-lineage leukemia (MLL) gene with AF4, AF9, or ENL results in acute leukemia with both lymphoid and myeloid involvement. We characterized leukemia-initiating cells (LICs) in primary infant MLL-rearranged leukemia using a xenotransplantation model. In MLL-AF4 patients, CD34(+)CD38(+)CD19(+) and CD34(-)CD19(+) cells initiated leukemia, and in MLL-AF9 patients, CD34(-)CD1...
We show the molecular and functional characterization of a novel population of lineage-negative CD34-negative (Lin(-)CD34(-)) hematopoietic stem cells from chronic myelogenous leukemia (CML) patients at diagnosis. Molecular karyotyping and quantitative analysis of BCR-ABL transcript demonstrated that approximately one-third of CD34(-) cells are leukemic. CML Lin(-)CD34(-) cells showed kinetic q...
Acute myeloid leukemia (AML) is believed to arise from leukemic stem-like cells (LSC) making understanding the biological differences between LSC and normal stem cells (HSC) or common myeloid progenitors (CMP) crucial to understanding AML biology. To determine if protein expression patterns were different in LSC compared to other AML and CD34+ populations, we measured the expression of 121 prot...
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