Pbx1-d Induces T cell Activation and a Decreased Apoptosis in Response to Retinoic Acids (RA)
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE22799 | GEO | 2010/07/07
SECONDARY ACCESSION(S): PRJNA127921
REPOSITORIES: GEO
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Project description:The hypothesis was tested that the Pbx1-d isoform was responsible for the Sle1a.1 phenotypes in CD4+ T cells. Jurkat T cells were transfected with a lentiviral construct expressing Pbx1-d-GFP or control RFP. Pbx1-d over-expression reduced the percentage of late apoptotic cells in response to anti-CD3 and anti-CD28 stimulation as compared with control-Lin28-transfected cells. Overall, these data demonstrate that over-expression of Pbx1-d results in an activated/inflammatory phenotype and in a defective response to RA in Jurkat T cells, strongly suggesting that the increased expression of Pbx1-d is responsible for the Sle1a.1 phenotypes. Jurkat T cells (5 x 105 cells/ml) were transfected with an lentiviral (LV) vector expressing either control (RFP or Lin28) or Pbx1-d-GFP. Total RNA was extracted from GFP+ or RFP+ FACS-sorted Jurkat T cells transfected LV-GFP-Pbx1-d or LV-RFP, as well as non-transfected cells in 4 independent transfections per group.
2010-07-07 | E-GEOD-22799 | biostudies-arrayexpress
Project description:To assess the role of a variant of unknown significance in PBX1 (p.(Arg107Gln) by generating a HEK293T-derived cell line knockdown for PBX1 (clone 22 cells) through CRISPR-Cas9. We then transfected the KD cells or the WT HEK293T cells with a plasmid encoding either WT or Arg107Gln PBX1 proteins.
2023-02-28 | GSE215967 | GEO
Project description:Sle1a.1 is part of the Sle1a lupus susceptibility locus which results in the production of activated and autoreactive CD4+ T cells as well as a reduction in the peripheral regulatory T cell (Treg) pool. Sle1a.1 CD4+ T cells showed a defective response to retinoic acid (RA) expansion of TGFβ-induced Tregs. At the molecular level, Sle1a.1 corresponds to an increased expression of a novel splice isoform of Pbx1, Pbx1-d. Pbx1-d over-expression is sufficient to induce an activated/inflammatory phenotype in Jurkat T cells, and to decrease their apoptotic response to RA. PBX1-d is expressed more frequently in lupus patients than in healthy controls, and its presence correlates with an increased memory T cell population. These findings indicate that Pbx1 is a novel lupus susceptibility gene that regulates T cell activation and tolerance.
2010-06-16 | GSE22313 | GEO
Project description:Sle1a.1 is part of the Sle1a lupus susceptibility locus which results in the production of activated and autoreactive CD4+ T cells as well as a reduction in the peripheral regulatory T cell (Treg) pool. Sle1a.1 CD4+ T cells showed a defective response to retinoic acid (RA) expansion of TGFβ-induced Tregs. At the molecular level, Sle1a.1 corresponds to an increased expression of a novel splice isoform of Pbx1, Pbx1-d. Pbx1-d over-expression is sufficient to induce an activated/inflammatory phenotype in Jurkat T cells, and to decrease their apoptotic response to RA. PBX1-d is expressed more frequently in lupus patients than in healthy controls, and its presence correlates with an increased memory T cell population. These findings indicate that Pbx1 is a novel lupus susceptibility gene that regulates T cell activation and tolerance. Total RNA from CD4+ T cells from C57BL/6 (B6) and B6.Sle1a.1 (Sle) mice was isolated, with 4 biological replicates each. Gene expression data from C57BL/6 mice were compared with data from B6.Sle2c1 mice.
2010-07-08 | E-GEOD-22313 | biostudies-arrayexpress
Project description:Elucidating the pathogenesis of chemoresistance is fundamental for developing more effective interventions that will improve the clinical outcome of neoplastic diseases such as ovarian cancer. Here, we report the upregulation of PBX1, a stem cell reprogramming factor, in recurrent ovarian carcinomas. Moreover, high levels of PBX1 expression are correlated with a shorter survival rate among post-chemotherapy ovarian cancer patients. Ectopic expression of PBX1 promotes cancer stem cell-like phenotypes, including increased side population and ALDH activity, enhanced tumorigenicity at a low cell density, and increased resistance to platinum-based therapy. Silencing PBX1 in platinum-resistant cell lines that overexpress PBX1 sensitizes cells to platinum treatment and reduces their “stemness”. Analysis of previously reported genome-wide chromatin immunoprecipitation data shows that PBX1 binds directly to promoters of genes involved in stem cell maintenance and tissue injury response. We confirmed direct regulation of STAT3 by PBX1, and demonstrated that the PBX1 binding motif located on the STAT3 promoter participates in positive transcriptional regulation of STAT3. Furthermore, a STAT3/JAK2 inhibitor potently sensitizes platinum-resistant cells to carboplatin and suppresses their growth in vivo. These findings establish PBX1 as an upstream regulator of key pathways in stem cell and tissue damage response and highlight the potential of targeting the PBX1/STAT3 axis to overcome chemoresistance in human cancers.
2016-07-25 | GSE84755 | GEO
Project description:Elucidating the pathogenesis of chemoresistance is fundamental for developing more effective interventions that will improve the clinical outcome of neoplastic diseases such as ovarian cancer. Here, we report the upregulation of PBX1, a stem cell reprogramming factor, in recurrent ovarian carcinomas. Moreover, high levels of PBX1 expression are correlated with a shorter survival rate among post-chemotherapy ovarian cancer patients. Ectopic expression of PBX1 promotes cancer stem cell-like phenotypes, including increased side population and ALDH activity, enhanced tumorigenicity at a low cell density, and increased resistance to platinum-based therapy. Silencing PBX1 in platinum-resistant cell lines that overexpress PBX1 sensitizes cells to platinum treatment and reduces their â??stemnessâ??. Analysis of previously reported genome-wide chromatin immunoprecipitation data shows that PBX1 binds directly to promoters of genes involved in stem cell maintenance and tissue injury response. We confirmed direct regulation of STAT3 by PBX1, and demonstrated that the PBX1 binding motif located on the STAT3 promoter participates in positive transcriptional regulation of STAT3. Furthermore, a STAT3/JAK2 inhibitor potently sensitizes platinum-resistant cells to carboplatin and suppresses their growth in vivo. These findings establish PBX1 as an upstream regulator of key pathways in stem cell and tissue damage response and highlight the potential of targeting the PBX1/STAT3 axis to overcome chemoresistance in human cancers. Determine gene expression changes after knockdown of PBX1 protein in an ovarian cancer cell line (OVCAR3)
2016-07-25 | E-GEOD-84755 | biostudies-arrayexpress
Project description:Pre B cell leukemia homeobox 1 (Pbx1) regulates the balance between self-renewal and differentiation of hematopoietic stem cells, and maintains proto-oncogenic transcriptional pathways implicated in several tumors. Its aberrant expression was found in a subset of myeloproliferative neoplasms (MPN) patients bearing the JAK2V617F mutation. To investigate if Pbx1 contributes to MPN, and to explore its potential as therapeutic target, we generated a new mouse strain, that we called JP, by crossing a known JAK2V617F inducible knock-in MPN model with a Pbx1 conditional-ko. In JP mice we can simultaneously activate the human JAK2 mutation and delete Pbx1. Typical MPN features, such as thrombocytemia and granulocytosis, did not develop in the absence of Pbx1. Erythrocytosis, initially displayed by JP mice, gradually resolved over time. Moreover, splenic myeloid metaplasia and in vitro cytokine independent growth were rescued by Pbx1 inactivation. Through RNA-Sequencing we analyzed molecular pathways downstream of Pbx1 and involved in MPN maintenance in stem and progenitor cells. The aberrant transcriptome in the MPN model compared to wild-type was rescued by the absence of Pbx1. Our results demonstrate that inhibition of the Pbx1-driven transcriptional program is beneficial in MPN. Modulation of Pbx1 activity by direct targeting or by targeting its downstream mediators might thus represent a novel therapeutic approach.
2021-10-21 | GSE153482 | GEO
Project description:PTBP1 and PTBP2 control alternative splicing programs during neuronal development, but the cellular functions of most PTBP1/2-regulated isoforms remain unknown. We show that PTBP1 guides developmental gene expression by regulating the transcription factor Pbx1. We identify exons that are differentially spliced when mouse embryonic stem cells (ESCs) differentiate into neuronal progenitor cells (NPCs) and neurons, and transition from PTBP1 to PTBP2 expression. We define those exons controlled by PTBP1 in ESCs and NPCs by RNA-seq analysis after PTBP1 depletion and PTBP1 crosslinking-immunoprecipitation. We find that PTBP1 represses Pbx1 exon 7 and the expression of its neuronal isoform Pbx1a in ESC. Using CRISPR-Cas9 to delete regulatory elements for exon 7, we induce Pbx1a expression in ESCs, finding that this activates transcription of specific neuronal genes including known Pbx1 targets. Thus PTBP1 controls the activity of Pbx1 and suppresses its neuronal transcriptional program prior to differentiation. HB9-GFP mESC were transiently transfected with Cas9 and guide RNA sequences to generate heterozygous deletions at the Pbx1 intron 6 locus (Pbx1 I6 +/-). Wild type and (n=3) or Pbx1 I6 +/- (n=5) clones were differentiated in MN media. Samples were harvested at Day 2 of differentiation, and poly-A RNA was isolated for RNA-sequencing and gene expression analyses.
2016-07-03 | E-GEOD-70883 | biostudies-arrayexpress
Project description:Perfect fetal development is a solid foundation for successful fertility, in which the abundant natural killer (NK) cells in the decidua tissue at the maternal-fetal interface play an important role during the first trimester. The functional subsets and transcriptional regulation mechanisms of decidual NK (dNK) cells remain poorly understood. Here, we identified CD49a+PBX1+ dNK cells as a unique subset of NK cells that promote fetal development in both human and mice. PBX1 drove the transcription of key functional molecules pleiotrophin and osteoglycin that promote fetal development through direct promoter binding. In patients with unexplained recurrent spontaneous abortion (URSA), decreased expression of PBX1 and PBX1(G21S) mutation correlated with fetal growth restriction and pregnancy failure. Inactivation of Pbx1 in mouse NK cells caused impaired fetal development due to a decrease in growth promoting factors. Our observations reveal the molecular regulation mechanism of CD49a+PBX1+ dNK cells promoting fetal development, and indicate that impaired PBX1 in dNK cells may serve as pathogenesis and biomarker of URSA.
2021-01-01 | GSE110244 | GEO
Project description:During development cell fates are specified by tightly controlled gene expression programs. PBX TALE transcription factors control gene regulatory networks (GRN) that direct vertebrate tissue patterning and organ morphogenesis. How PBX1/2 proteins achieve context-specific functions, despite widespread embryonic Pbx expression, remains elusive. In mouse limbs, mesenchymal-specific loss of PBX1/2 or of the limb regulator HAND2 results in strikingly similar phenotypes, suggesting that PBX1/2- and HAND2-dependent programs converge to control limb development. To investigate this scenario using the murine hindlimb model, we combined tissue-specific and temporally controlled mutagenesis to multi-omics approaches on dissected hindlimb buds. This resulted in the reconstruction of a GRN that is collaboratively directed by PBX1/2-HAND2, demonstrating that Pbx1-Hand2 genetically interact in vivo during pentadactylous hindlimb patterning, with PBX1 concomitantly acting as an upstream regulator of Hand2. At organismal-level resolution the GRN is active within restricted subsets of posterior-proximal hindlimb mesenchymal cells, wherein Pbx1/2 and Hand2 are co-expressed with their target genes. Profiling the binding of Pbx1 and Hand2 genome-wide across multiple tissues revealed that HAND2 can act selectively on a subset of PBX-bound regions to impart limb patterning functionality. Our research elucidates mechanisms on the limb-specific activities of PBX1/2, while informing general principles by which promiscuous transcription factors cooperate with select cofactors to instruct distinct developmental programs.
2023-04-26 | GSE197855 | GEO