Project description:RNA-seq of human embryonic stem cells H1 ESC cells and the differentiated NPC cells with FOXK1/2 and SIN3A knock down and the control condition.
Project description:Gene expression profiling of progenitor and neutrophil-derived HoxB8-ER cells (WT and Ezh2-/-) and neutrophil-derived HOXB8-ER treated with GSK343 and vehicle for 9 days. Ezh2 loss might lead to effective cytopenias caused by dysfunctional mature cells. To test this hypothesis, we examined Ezh2-null murine myeloid cell lines capable of neutrophilic differentiation. Bone marrow cells from Ezh2-/- and controls were immortalized with a HoxB8-estrogen receptor fusion and could be differentiated into mature neutrophils by removing estrogen from the culture medium.Gene expression profiling showed upregulation of oxidative phosphorylation pathway genes and ectopic expression of Gata1 and its associated erythroid gene targets. Functional and gene expression differences observed in Ezh2-/- derived neutrophils could be replicated in controls by treatment with the Ezh2-specific inhibitor GSK343. In conclusion, we demonstrate that Ezh2 loss allows for differentiation of normal appearing, but dysfunctional mature neutrophils characterized by ectopic gene expression and elevated levels of reactive oxygen species. These defects could contribute to the inflammatory bone marrow microenvironment and clinical phenotypes observed in patients with MDS.
Project description:Progenitor cells of yolk sac and bone marrow origin were transduced with an estrogen receptor Hoxb8 fusion protein to generate stable cell lines. Macrophages were differentiated with M-CSF in the absence of estrogen, and then stimulated with IL-4 or LPS. Hoxb8 progenitor cells and differentiated macrophages were analyzed by RNA sequencing.
Project description:The impact of LPS and LTA stimulation on differentiated bone marrow and Yolk sac Hoxb8 macrophages in comparison to untreated control cells was studied by global protein profiling using a bottom-up approach.
Project description:<p>The efficacy of the adaptive immune response declines dramatically with age, but the cell-intrinsic mechanisms driving the changes characteristic of immune aging in humans remain poorly understood. One hallmark of immune aging is the loss of self-renewing naive cells and the accumulation of differentiated but dysfunctional cells within the CD8 T cell compartment. Using ATAC-seq, we first inferred the transcription factor binding activities that maintain the naive and central and effector memory CD8 T cell states in young adults. Integrating our results with RNA-seq, we determined that BATF, ETS1, Eomes, and Sp1 govern transcription networks associated with specific CD8 T cell subset properties, including activation and proliferative potential. Extending our analysis to aged humans, we found that the differences between memory and naive CD8 T cells were largely preserved across age, but that naive and central memory cells from older individuals exhibited a shift toward a more differentiated pattern of chromatin openness. Additionally, aged naive cells displayed a loss in chromatin openness at gene promoters, a phenomenon that appears to be due largely to a loss in binding by NRF1, leading to a marked drop-off in the ability of the naive cell to initiate transcription of mitochondrial genes. Our findings identify BATF- and NRF1-driven gene regulation as targets for delaying CD8 T cell aging and restoring T cell function.</p>