搜索结果: 'methocult media formulations for human hematopoietic cells serum containing'

The proliferation and differentiation effects of the synthetic retinoid TTNPB and of 13-cis retinoic acid (RA) on hemopoietic progenitors from bone marrow of myelodysplastic syndrome (MDS) patients were compared. The addition of TTNPB or RA to culture plates containing MDS patient's marrow cells stimulated myeloid colony (CFU-C) growth and caused a significant increase in granulocytic colonies (CFU-G). In the presence of RA the increase in CFU-G was statistically insignificant. Cellular differentiation studies in liquid suspension culture revealed that the two retinoic acid analogues cause a marked decrease in immature granulocytes and an increase in mature granulocytes. There was further an increase in the number of cells that reacted positively with monoclonal antibodies (McAb) binding specifically to granulocytes (B4,3,B13,9 and Leu M4) and a decrease in the percentage of cells reacting with the McAb against Ia-like determinants. These findings indicate that TTNPB is as active as RA in stimulating the growth of hemopoietic progenitors from MDS patients and in enhancing granulocytic differentiation in liquid culture. View Publication

Background and aimsMortality rates for hepatocellular carcinoma (HCC) remain high,while multimodal treatment approaches offer new perspectives. Here,we investigated the association of extracellular nicotinamide adenine dinucleotide (eNAD+) on ecto-nucleotide pyrophosphatase/phosphodiesterase 1 (CD203a,ENPP1 or PC-1) on Th17 cells in relation to the likelihood of HCC recurrence following liver resection.MethodThe study compared heparinized blood plasma samples from 95 patients who underwent liver resection,including 25 patients with HCC and 24 control patients without liver disease. Plasma eNAD+ concentrations were determined using a heat-based dichotomous pH extraction method,followed by enzymatic cycling and a colorimetric assay for quantification. Fibrosis was graded histologically using the Desmet score (F0–F4). Surface expression analysis was performed using flow cytometry.ResultsWith increasing grades of liver fibrosis predominant in HCC patients,a significant reduction in plasma eNAD+ concentrations was measured (p < 0.05). Further,a significant correlation was found between HCC patients and CD203a expression on CD4+,CCR4+ as well as CCR6+ T cells (p < 0.05). Patients who exhibited high proportions of CD203a expressing Th17 cells (CD4+,CCR6+ CCR4+) post surgery were found to be at a sixfold increased risk (HR 6.38,95% Cl 1.51–27.00) of HCC recurrence and had a median recurrence-free survival of 233 days (p < 0.05),compared to patients with low CD203a expressing Th17 cells (CD4+ CCR6+ CCR4+). Similarly,patients who had a high proportion of CD203a expressing Th17 cells (CD4+ CCR6+) following surgery had a fivefold increased risk (HR 5.56,95% Cl 1.58–19.59) of HCC recurrence and a median recurrence-free survival of 334 days (p < 0.05) compared to those with low CD203a expressing Th17 cells (CCR6+).ConclusionThe data indicates that eNAD+ levels are decreased in patients with liver fibrosis or cirrhosis. Strikingly,patients with high CD203a expression on Th17 cells had a significantly increased likelihood of recurrence,highlighting its potential as a valuable prognostic marker and a possible therapeutic target.Supplementary InformationThe online version contains supplementary material available at 10.1007/s00432-025-06155-4. View Publication

Notoginsenoside R1 (NGR1) is the main monomeric component extracted from the dried roots and rhizomes of Panax notoginseng,and exerts pharmacological action against myocardial infarction (MI). Owing to the differences in compound distribution,absorption,and metabolism in vivo,exploring a more effective drug delivery system with a high therapeutic targeting effect is crucial. In the early stages of MI,CD11b-expressing monocytes and neutrophils accumulate at infarct sites. Thus,we designed a mesoporous silica nanoparticle-conjugated CD11b antibody with loaded NGR1 (MSN-NGR1-CD11b antibody),which allowed NGR1 precise targeted delivery to the heart in a noninvasively manner. By increasing targeting to the injured myocardium,intravenous injection of MSN-NGR1-CD11b antibody nanoparticle in MI mice improved cardiac function and angiogenesis,reduced cell apoptosis,and regulate macrophage phenotype and inflammatory factors and chemokines. In order to further explore the mechanism of NGR1 protecting myocardium,cell oxidative stress model and oxygen-glucose deprivation (OGD) model were established. NGR1 protected H9C2 cells and primary cardiomyocytes against oxidative injury induced by H2O2 and OGD treatment. Further network pharmacology and molecular docking analyses suggested that the AKT,MAPK and Hippo signaling pathways were involved in the regulation of NGR1 in myocardial protection. Indeed,NGR1 could elevate the levels of p-Akt and p-ERK,and promote the nuclear translocation of YAP. Furthermore,LY294002 (AKT inhibitor),U0126 (ERK1/2 inhibitor) and Verteporfin (YAP inhibitor) administration in H9C2 cells indicated the involvement of AKT,MAPK and Hippo signaling pathways in NGR1 effects. Meanwhile,MSN-NGR1-CD11b antibody nanoparticles enhanced the activation of AKT and MAPK signaling pathways and the nuclear translocation of YAP at the infarcted site. Our research demonstrated that MSN-NGR1-CD11b antibody nanoparticle injection after MI enhanced the targeting of NGR1 to the infarcted myocardium and improved cardiac function. More importantly,our pioneering research provides a new strategy for targeting drug delivery systems to the ischemic niche. View Publication

Circulating tumour cell (CTC) enumeration and profiling has been established as a valuable clinical tool in many solid malignancies. A key challenge in CTC research is the limited number of cells available for study. Ex vivo CTC culture permits expansion of these rare cell populations for detailed characterisation,functional assays including drug sensitivity testing,and investigation of the pathobiology of metastases. We report for the first time the establishment and characterisation of two continuous CTC lines from patients with gastroesophageal cancer. The two cell lines (designated UWG01CTC and UWG02CTC) demonstrated rapid tumorigenic growth in immunodeficient mice and exhibit distinct genotypic and phenotypic profiles which are consistent with the tumours of origin. UWG02CTC exhibits an EpCAM+,cytokeratin+,CD44+ phenotype,while UWG01CTC,which was derived from a patient with metastatic neuroendocrine cancer,displays an EpCAM-,weak cytokeratin phenotype,with strong expression of neuroendocrine markers. Further,the two cell lines show distinct differences in drug and radiation sensitivity which match differential cancer-associated gene expression pathways. This is strong evidence implicating EpCAM negative CTCs in metastasis. These novel,well characterised,long-term CTC cell lines from gastroesophageal cancer will facilitate ongoing research into metastasis and the discovery of therapeutic targets. View Publication

OBJECTIVE: To investigate the kinetics of myocardial engraftment of bone marrow-derived mononuclear cells (BMNCs) after intracoronary injection using 99mTc-d,l-hexamethylpropylene amine oxime (99mTc-HMPAO) nuclear imaging in patients with acute and chronic anterior myocardial infarction. DESIGN: Nuclear imaging-derived tracking of BMNCs at 2 and 20 h after injection in the left anterior descending (LAD) coronary artery. SETTING: Academical cardiocentre. PATIENTS: Five patients with acute (mean (SD) age 58 (11) years; ejection fraction range 33-45%) and five patients with chronic (mean (SD) age 50 (6) years; ejection fraction range 28-34%) anterior myocardial infarction. INTERVENTIONS: A total of 24.2 x 10(8)-57.0 x 10(8) BMNCs (20% labelled with 700-1000 MBq 99mTc-HMPAO) were injected in the LAD coronary artery. RESULTS: At 2 h after BMNC injection,myocardial activity was observed in all patients with acute (range 1.31-5.10%) and in all but one patient with chronic infarction (range 1.10-3.0%). At 20 h,myocardial engraftment was noted only in three patients with acute myocardial infarction,whereas no myocardial activity was noted in any patient with chronic infarction. CONCLUSIONS: Engraftment of BMNCs shows dynamic changes within the first 20 h after intracoronary injection. Persistent myocardial engraftment was noted only in a subset of patients with acute myocardial infarction. View Publication

The beta-globin locus control region (LCR) is a large DNA element that is required for high-level expression of beta-like globin genes from the endogenous mouse locus or in transgenic mice carrying the human beta-globin locus. The LCR encompasses 6 DNaseI hypersensitive sites (HSs) that bind transcription factors. These HSs each contain a core of a few hundred base pairs (bp) that has most of the functional activity and exhibits high interspecies sequence homology. Adjoining the cores are 500- to 1000-bp flanks" with weaker functional activity and lower interspecies homology. Studies of human beta-globin transgenes and of the endogenous murine locus show that deletion of an entire HS (core plus flanks) moderately suppresses expression. However� View Publication

The derivation of three-dimensional (3D) stratified neural retina from pluripotent stem cells has permitted investigations of human photoreceptors. We have generated a H9 human embryonic stem cell subclone that carries a green fluorescent protein (GFP) reporter under the control of the promoter of cone-rod homeobox (CRX),an established marker of postmitotic photoreceptor precursors. The CRXp-GFP reporter replicates endogenous CRX expression in vitro when the H9 subclone is induced to form self-organizing 3D retina-like tissue. At day 37,CRX+ photoreceptors appear in the basal or middle part of neural retina and migrate to apical side by day 67. Temporal and spatial patterns of retinal cell type markers recapitulate the predicted sequence of development. Cone gene expression is concomitant with CRX,whereas rod differentiation factor neural retina leucine zipper protein (NRL) is first observed at day 67. At day 90,robust expression of NRL and its target nuclear receptor NR2E3 is evident in many CRX+ cells,while minimal S-opsin and no rhodopsin or L/M-opsin is present. The transcriptome profile,by RNA-seq,of developing human photoreceptors is remarkably concordant with mRNA and immunohistochemistry data available for human fetal retina although many targets of CRX,including phototransduction genes,exhibit a significant delay in expression. We report on temporal changes in gene signatures,including expression of cell surface markers and transcription factors; these expression changes should assist in isolation of photoreceptors at distinct stages of differentiation and in delineating coexpression networks. Our studies establish the first global expression database of developing human photoreceptors,providing a reference map for functional studies in retinal cultures. View Publication

Little is known about how neural stem cells are formed initially during development. We investigated whether a default mechanism of neural specification could regulate acquisition of neural stem cell identity directly from embryonic stem (ES) cells. ES cells cultured in defined,low-density conditions readily acquire a neural identity. We characterize a novel primitive neural stem cell as a component of neural lineage specification that is negatively regulated by TGFbeta-related signaling. Primitive neural stem cells have distinct growth factor requirements,express neural precursor markers,generate neurons and glia in vitro,and have neural and non-neural lineage potential in vivo. These results are consistent with a default mechanism for neural fate specification and support a model whereby definitive neural stem cell formation is preceded by a primitive neural stem cell stage during neural lineage commitment. View Publication

FOXM1 is an important cell cycle regulator and regulates cell proliferation. In addition,FOXM1 has been reported to contribute to oncogenesis in various cancers. However,it is not clearly understood how FOXM1 contributes to acute myeloid leukemia (AML) cell proliferation. In this study,we investigated the cellular and molecular function of FOXM1 in AML cells. The FOXM1 messenger RNA (mRNA) expressed in AML cell lines was predominantly the FOXM1B isoform,and its levels were significantly higher than in normal high aldehyde dehydrogenase activity (ALDH(hi)) cells. Reduction of FOXM1 expression in AML cells inhibited cell proliferation compared with control cells,through induction of G(2)/M cell cycle arrest,a decrease in the protein expression of Aurora kinase B,Survivin,Cyclin B1,S-phase kinase-associated protein 2 and Cdc25B and an increase in the protein expression of p21(Cip1) and p27(Kip1). FOXM1 messenger RNA (mRNA) was overexpressed in all 127 AML clinical specimens tested (n = 21,56,32 and 18 for M1,M2,M4 and M5 subtypes,respectively). Compared with normal ALDH(hi) cells,FOXM1 gene expression was 1.65- to 2.26-fold higher in AML cells. Moreover,the FOXM1 protein was more strongly expressed in AML-derived ALDH(hi) cells compared with normal ALDH(hi) cells. In addition,depletion of FOXM1 reduced colony formation of AML-derived ALDH(hi) cells due to inhibition of Cdc25B and Cyclin B1 expression. In summary,we found that FOXM1B mRNA is predominantly expressed in AML cells and that aberrant expression of FOXM1 induces AML cell proliferation through modulation of cell cycle progression. Thus,inhibition of FOXM1 expression represents an attractive target for AML therapy. View Publication

The activity of neural precursor cells in the adult hippocampus is regulated by various stimuli; however,whether these stimuli regulate the same or different precursor populations remains unknown. Here,we developed a novel cell-sorting protocol that allows the purification to homogeneity of neurosphere-forming neural precursors from the adult mouse hippocampus and examined the responsiveness of individual precursors to various stimuli using a clonal assay. We show that within the Hes5-GFP(+)/Nestin-GFP(+)/EGFR(+) cell population,which comprises the majority of neurosphere-forming precursors,there are two distinct subpopulations of quiescent precursor cells,one directly activated by high-KCl depolarization,and the other activated by norepinephrine (NE). We then demonstrate that these two populations are differentially distributed along the septotemporal axis of the hippocampus,and show that the NE-responsive precursors are selectively regulated by GABA,whereas the KCl-responsive precursors are selectively modulated by corticosterone. Finally,based on RNAseq analysis by deep sequencing,we show that the progeny generated by activating NE-responsive versus KCl-responsive quiescent precursors are molecularly different. These results demonstrate that the adult hippocampus contains phenotypically similar but stimulus-specific populations of quiescent precursors,which may give rise to neural progeny with different functional capacity. View Publication

Efforts to improve the efficacy of adoptive T-cell therapies and immune checkpoint therapies in myelogenous leukemia are desired. In this study,we evaluated the antileukemia activity of adoptively transferred polyclonal cancer antigen-reactive T cells deficient in the regulator diacylglycerol kinase zeta (DGKζ) with or without PD-1/PD-L1 blockade. In the C1498 mouse model of myeloid leukemia,we showed that leukemia was eradicated more effectively in DGKζ-deficient (DGKζ-/-) mice than wild-type mice. T cells transferred from DGKζ-deficient mice to wild-type tumor-bearing recipients conferred this benefit. Leukemia clearance was similar to mice treated with anti-PD-L1. Strikingly,we found that the activity of adoptively transferred DGKζ-/- T cells relied partly on induction of sustainable host T-cell immunity. Transferring DGKζ-deficient T cells increased the levels of IFNγ and other cytokines in recipient mice,especially with coadministration of anti-PD-L1. Overall,our results offered evidence that targeting DGKζ may leverage the efficacy of adoptive T-cell and immune checkpoint therapies in leukemia treatment. Furthermore,they suggest that DGKζ targeting might decrease risks of antigen escape or resistance to immune checkpoint blockade. Cancer Res; 77(20); 5676-86. textcopyright2017 AACR. View Publication

Most patients with acute myelogenous leukemia (AML) relapse and die of their disease. Increasing evidence indicates that AML relapse is driven by the inability to eradicate leukemia stem cells (LSC). Thus,it is imperative to identify novel therapies that can ablate LSCs. Using an in silico gene expression-based screen for compounds evoking transcriptional effects similar to the previously described anti-LSC agent parthenolide,we identified AR-42 (OSU-HDAC42),a novel histone deacetylase inhibitor that is structurally similar to phenylbutyrate,but with improved activity at submicromolar concentrations. Here,we report that AR-42 induces NF-κB inhibition,disrupts the ability of Hsp90 to stabilize its oncogenic clients,and causes potent and specific cell death of LSCs but not normal hematopoietic stem and progenitor cells. Unlike parthenolide,the caspase-dependent apoptosis caused by AR-42 occurs without activation of Nrf-2-driven cytoprotective pathways. As AR-42 is already being tested in early clinical trials,we expect that our results can be extended to the clinic. View Publication