The forkhead transcription factor FOXP1 profile in B-cells and B-cell lymphoma cell lines
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
SUBMITTER: Michal Mokry
PROVIDER: E-GEOD-69009 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:Expression of the forkhead transcription factor FOXP1 is essential for early B cell development, whereas downregulation of FOXP1 at the germinal center (GC) stage is required for GC B cell function. Aberrantly high FOXP1 expression is frequently observed in diffuse large B cell lymphoma (DLBCL) and mucosa-associated lymphoid tissue (MALT) lymphoma, being associated with poor prognosis. Here, by gene expression microarray [GSE51382] and quantitative RT-PCR analysis upon ectopic overexpression of FOXP1 in primary human memory B cells (MBCs) and B-cell lines, combined with chromatin immunoprecipitation-sequencing (ChIP-seq), we established that FOXP1 directly represses expression of PRDM1, IRF4, and XBP1, transcriptional master regulators of plasma cell (PC) differentiation. In accordance, FOXP1 is prominently expressed in primary human naive and MBCs but expression strongly decreases during plasma PC differentiation. Moreover, as compared to IgM+ MBCs, IgG+ MBCs combine lower expression of FOXP1 with an enhanced intrinsic PC differentiation propensity, and constitutive (over)expression of FOXP1 in B cell lines and primary human MBCs represses their ability to differentiate into PCs. Taken together, our data indicate that proper control of FOXP1 expression plays a critical role in PC differentiation, whereas aberrant overexpression of FOXP1 might contribute to lymphomagenesis by blocking terminal B cell differentiation.
2015-05-19 | GSE69009 | GEO
Project description:To provide insight into the role of and target genes of the transcription factor FOXP1 in mature human B cells and in B cell non-Hodkgin lymhomas, we performed gene expression microarray studies, upon ectopic overexpression or silencing of FOXP1 in these cells. human memory B cells from 2 separate donors were transduced with LZRS-FOXP1-IRES-YFP or LZRS-IRES-YFP (negative control); DLBCL cell lines OCI-Ly1, OCI-Ly7, and OCI-Ly10 were transduced with LZRS-FOXP1-IRES-YFP or LZRS-IRES-YFP (negative control); DLBCL cell lines OCI-Ly1, OCI-Ly7, and OCI-Ly10 were transiently transfected with siRNA targeting FOXP1 or sigenome non-targeting siRNA (negative control), using the Lonza nucleofection system.
2014-10-24 | E-GEOD-51382 | biostudies-arrayexpress
Project description:Long-term humoral immunity is partly maintained by memory B cells (MBCs). MBCs can be recalled to produce antibody-producing plasma cells (PCs) or form secondary germinal centers (GCs). The former process underlies markedly increased antigen-specific antibodies seen in the secondary response, while the latter process allows continuous somatic hypermutation and affinity maturation. MBC re-participation in the GC reaction is thought to be important for generating broadly neutralizing antibodies against highly mutating viruses such as influenza and HIV. However, how MBC recall is transcriptionally or epigenetically programmed to produce secondary PCs or GCs is not yet understood. Here we show that BACH2, a transcription factor required for GC formation and maintenance1,2, decreases across post-activation stages of B cells, from the naïve state to GC, memory, and the terminal PC state. In contrast, BLIMP-1, a transcription factor that promotes PC formation3,4 and is antagonistic to BACH2 (ref. 5), increases as B cells traverse the same course. The relative strength between BLIMP-1 and BACH2 progressively increases in favor of BLIMP-1 in GCs and MBCs through the primary response. MBCs of the isotype or subset identity that preferentially give rise to secondary GCs exhibit comparatively higher BACH2 but lower BLIMP-1 expression than those predisposed for PC formation. Using a tetracycline-controlled circuit implanted in MBCs, we show that skewing the BLIMP-1-BACH2 balance in favor of BACH2 markedly increases GC formation by otherwise PC-predisposed MBCs, whereas skewing the balance in favor of BLIMP-1 drives PC formation by GC-prone MBCs, indicating that the potential for GC re-participation or PC development rests in the relative strength of BLIMP-1 over BACH2 within individual MBCs. Underneath this relative BLIMP-1-over-BACH2 strength in naïve B cells, GCs, MBCs and PCs, we observe progressively increased accessibilities to chromatin loci that are specifically opened in PCs, particularly those that contain ISRE elements and are controlled by IRF-4. IRF-4 is universally upregulated in B cells when stimulated through the BCR, the CD40 receptor, or by innate stimuli. By analyzing time-stamped GC B cells, we demonstrate a progressive increase in chromatin accessibilities at PC-specific, IRF-4-controlled gene loci over time. Our results support a model of progressive IRF-4 imprinting in which the cumulative stimulation history of B cells is epigenetically recorded in an IRF-4-dependent manner, determines the relative strength between BLIMP-1 and BACH2 in individual MBCs, and thereby dictates their individual probabilities to develop into GCs or PCs upon re-stimulation.
2024-06-04 | GSE246797 | GEO
Project description:Long-term humoral immunity is partly maintained by memory B cells (MBCs). MBCs can be recalled to produce antibody-producing plasma cells (PCs) or form secondary germinal centers (GCs). The former process underlies markedly increased antigen-specific antibodies seen in the secondary response, while the latter process allows continuous somatic hypermutation and affinity maturation. MBC re-participation in the GC reaction is thought to be important for generating broadly neutralizing antibodies against highly mutating viruses such as influenza and HIV. However, how MBC recall is transcriptionally or epigenetically programmed to produce secondary PCs or GCs is not yet understood. Here we show that BACH2, a transcription factor required for GC formation and maintenance1,2, decreases across post-activation stages of B cells, from the naïve state to GC, memory, and the terminal PC state. In contrast, BLIMP-1, a transcription factor that promotes PC formation3,4 and is antagonistic to BACH2 (ref. 5), increases as B cells traverse the same course. The relative strength between BLIMP-1 and BACH2 progressively increases in favor of BLIMP-1 in GCs and MBCs through the primary response. MBCs of the isotype or subset identity that preferentially give rise to secondary GCs exhibit comparatively higher BACH2 but lower BLIMP-1 expression than those predisposed for PC formation. Using a tetracycline-controlled circuit implanted in MBCs, we show that skewing the BLIMP-1-BACH2 balance in favor of BACH2 markedly increases GC formation by otherwise PC-predisposed MBCs, whereas skewing the balance in favor of BLIMP-1 drives PC formation by GC-prone MBCs, indicating that the potential for GC re-participation or PC development rests in the relative strength of BLIMP-1 over BACH2 within individual MBCs. Underneath this relative BLIMP-1-over-BACH2 strength in naïve B cells, GCs, MBCs and PCs, we observe progressively increased accessibilities to chromatin loci that are specifically opened in PCs, particularly those that contain ISRE elements and are controlled by IRF-4. IRF-4 is universally upregulated in B cells when stimulated through the BCR, the CD40 receptor, or by innate stimuli. By analyzing time-stamped GC B cells, we demonstrate a progressive increase in chromatin accessibilities at PC-specific, IRF-4-controlled gene loci over time. Our results support a model of progressive IRF-4 imprinting in which the cumulative stimulation history of B cells is epigenetically recorded in an IRF-4-dependent manner, determines the relative strength between BLIMP-1 and BACH2 in individual MBCs, and thereby dictates their individual probabilities to develop into GCs or PCs upon re-stimulation.
2024-06-04 | GSE246800 | GEO
Project description:Long-term humoral immunity is partly maintained by memory B cells (MBCs). MBCs can be recalled to produce antibody-producing plasma cells (PCs) or form secondary germinal centers (GCs). The former process underlies markedly increased antigen-specific antibodies seen in the secondary response, while the latter process allows continuous somatic hypermutation and affinity maturation. MBC re-participation in the GC reaction is thought to be important for generating broadly neutralizing antibodies against highly mutating viruses such as influenza and HIV. However, how MBC recall is transcriptionally or epigenetically programmed to produce secondary PCs or GCs is not yet understood. Here we show that BACH2, a transcription factor required for GC formation and maintenance1,2, decreases across post-activation stages of B cells, from the naïve state to GC, memory, and the terminal PC state. In contrast, BLIMP-1, a transcription factor that promotes PC formation3,4 and is antagonistic to BACH2 (ref. 5), increases as B cells traverse the same course. The relative strength between BLIMP-1 and BACH2 progressively increases in favor of BLIMP-1 in GCs and MBCs through the primary response. MBCs of the isotype or subset identity that preferentially give rise to secondary GCs exhibit comparatively higher BACH2 but lower BLIMP-1 expression than those predisposed for PC formation. Using a tetracycline-controlled circuit implanted in MBCs, we show that skewing the BLIMP-1-BACH2 balance in favor of BACH2 markedly increases GC formation by otherwise PC-predisposed MBCs, whereas skewing the balance in favor of BLIMP-1 drives PC formation by GC-prone MBCs, indicating that the potential for GC re-participation or PC development rests in the relative strength of BLIMP-1 over BACH2 within individual MBCs. Underneath this relative BLIMP-1-over-BACH2 strength in naïve B cells, GCs, MBCs and PCs, we observe progressively increased accessibilities to chromatin loci that are specifically opened in PCs, particularly those that contain ISRE elements and are controlled by IRF-4. IRF-4 is universally upregulated in B cells when stimulated through the BCR, the CD40 receptor, or by innate stimuli. By analyzing time-stamped GC B cells, we demonstrate a progressive increase in chromatin accessibilities at PC-specific, IRF-4-controlled gene loci over time. Our results support a model of progressive IRF-4 imprinting in which the cumulative stimulation history of B cells is epigenetically recorded in an IRF-4-dependent manner, determines the relative strength between BLIMP-1 and BACH2 in individual MBCs, and thereby dictates their individual probabilities to develop into GCs or PCs upon re-stimulation.
2024-06-04 | GSE246799 | GEO
Project description:Long-term humoral immunity is partly maintained by memory B cells (MBCs). MBCs can be recalled to produce antibody-producing plasma cells (PCs) or form secondary germinal centers (GCs). The former process underlies markedly increased antigen-specific antibodies seen in the secondary response, while the latter process allows continuous somatic hypermutation and affinity maturation. MBC re-participation in the GC reaction is thought to be important for generating broadly neutralizing antibodies against highly mutating viruses such as influenza and HIV. However, how MBC recall is transcriptionally or epigenetically programmed to produce secondary PCs or GCs is not yet understood. Here we show that BACH2, a transcription factor required for GC formation and maintenance1,2, decreases across post-activation stages of B cells, from the NAIVE state to GC, memory, and the terminal PC state. In contrast, BLIMP-1, a transcription factor that promotes PC formation3,4 and is antagonistic to BACH2 (ref. 5), increases as B cells traverse the same course. The relative strength between BLIMP-1 and BACH2 progressively increases in favor of BLIMP-1 in GCs and MBCs through the primary response. MBCs of the isotype or subset identity that preferentially give rise to secondary GCs exhibit comparatively higher BACH2 but lower BLIMP-1 expression than those predisposed for PC formation. Using a tetracycline-controlled circuit implanted in MBCs, we show that skewing the BLIMP-1-BACH2 balance in favor of BACH2 markedly increases GC formation by otherwise PC-predisposed MBCs, whereas skewing the balance in favor of BLIMP-1 drives PC formation by GC-prone MBCs, indicating that the potential for GC re-participation or PC development rests in the relative strength of BLIMP-1 over BACH2 within individual MBCs. Underneath this relative BLIMP-1-over-BACH2 strength in NAIVE B cells, GCs, MBCs and PCs, we observe progressively increased accessibilities to chromatin loci that are specifically opened in PCs, particularly those that contain ISRE elements and are controlled by IRF-4. IRF-4 is universally upregulated in B cells when stimulated through the BCR, the CD40 receptor, or by innate stimuli. By analyzing time-stamped GC B cells, we demonstrate a progressive increase in chromatin accessibilities at PC-specific, IRF-4-controlled gene loci over time. Our results support a model of progressive IRF-4 imprinting in which the cumulative stimulation history of B cells is epigenetically recorded in an IRF-4-dependent manner, determines the relative strength between BLIMP-1 and BACH2 in individual MBCs, and thereby dictates their individual probabilities to develop into GCs or PCs upon re-stimulation.
2024-06-04 | GSE267568 | GEO
Project description:Long-term humoral immunity is partly maintained by memory B cells (MBCs). MBCs can be recalled to produce antibody-producing plasma cells (PCs) or form secondary germinal centers (GCs). The former process underlies markedly increased antigen-specific antibodies seen in the secondary response, while the latter process allows continuous somatic hypermutation and affinity maturation. MBC re-participation in the GC reaction is thought to be important for generating broadly neutralizing antibodies against highly mutating viruses such as influenza and HIV. However, how MBC recall is transcriptionally or epigenetically programmed to produce secondary PCs or GCs is not yet understood. Here we show that BACH2, a transcription factor required for GC formation and maintenance1,2, decreases across post-activation stages of B cells, from the naïve state to GC, memory, and the terminal PC state. In contrast, BLIMP-1, a transcription factor that promotes PC formation3,4 and is antagonistic to BACH2 (ref. 5), increases as B cells traverse the same course. The relative strength between BLIMP-1 and BACH2 progressively increases in favor of BLIMP-1 in GCs and MBCs through the primary response. MBCs of the isotype or subset identity that preferentially give rise to secondary GCs exhibit comparatively higher BACH2 but lower BLIMP-1 expression than those predisposed for PC formation. Using a tetracycline-controlled circuit implanted in MBCs, we show that skewing the BLIMP-1-BACH2 balance in favor of BACH2 markedly increases GC formation by otherwise PC-predisposed MBCs, whereas skewing the balance in favor of BLIMP-1 drives PC formation by GC-prone MBCs, indicating that the potential for GC re-participation or PC development rests in the relative strength of BLIMP-1 over BACH2 within individual MBCs. Underneath this relative BLIMP-1-over-BACH2 strength in naïve B cells, GCs, MBCs and PCs, we observe progressively increased accessibilities to chromatin loci that are specifically opened in PCs, particularly those that contain ISRE elements and are controlled by IRF-4. IRF-4 is universally upregulated in B cells when stimulated through the BCR, the CD40 receptor, or by innate stimuli. By analyzing time-stamped GC B cells, we demonstrate a progressive increase in chromatin accessibilities at PC-specific, IRF-4-controlled gene loci over time. Our results support a model of progressive IRF-4 imprinting in which the cumulative stimulation history of B cells is epigenetically recorded in an IRF-4-dependent manner, determines the relative strength between BLIMP-1 and BACH2 in individual MBCs, and thereby dictates their individual probabilities to develop into GCs or PCs upon re-stimulation.
2024-06-04 | GSE267566 | GEO
Project description:FOXO transcription factors are key players in diverse cellular processes affecting tumorigenesis, stem cell maintenance and lifespan. To gain insight into mechanisms of FOXO regulated target gene expression, we studied genome-wide effects of FOXO3 activation. Profiling RNA polymerase II changes shows FOXO3 regulates gene expression through transcription initiation. Correlative analysis of FOXO3 and RNA polymerase II ChIP-seq profiles demonstrates FOXO3 to act as a transcriptional activator. Furthermore, this analysis reveals a significant part of FOXO3 gene regulation proceeds through enhancer regions. FOXO3 binds to pre-existing enhancers and further activates these enhancers as shown by changes in histone acetylation and RNA polymerase II recruitment. In addition, FOXO3-mediated enhancer activation correlates with regulation of adjacent genes and pre-existence of chromatin loops between FOXO3 bound enhancers and target genes. Combined, our data elucidate how FOXOs regulate gene transcription and provide insight into mechanisms by which FOXOs can induce different gene expression programs depending on chromatin architecture. Paper with published gene expression: PMID 22139133. Examination of FOXO3 binding and changes in RNAPII occupancy (0, 4, 24 hours after induction) in colorectal cell line
2012-11-15 | E-GEOD-35486 | biostudies-arrayexpress
Project description:Memory B cells (MBCs) play a critical role in protection against homologous and variant pathogen challenge by either differentiating to plasma cells (PCs) or to germinal center (GCs) B cells. The human MBC compartment contains both switched IgG+ and unswitched IgM+ MBCs and at present the contribution of these MBC subpopulations to protection is incompletely understood. We discovered that intrinsic antigen-affinity thresholds for activation were at least 100-fold higher for IgG+ as compared to IgM+ MBCs and that IgG+ MBCs when challenged responded only to high affinity antigens and differentiated almost exclusively towards PC fates. In contrast, IgM+ MBCs were eliminated by apoptosis by high affinity antigens and responded to low affinity antigens by differentiating towards GC B cell fates. Thus, IgG+ and IgM+ MBCs may play distinct yet complementary roles in response to pathogen challenge to ensure the immediate production of high affinity antibodies to homologous and closely related challenges and the generation of variant-specific MBCs through GC reactions.
2023-10-25 | GSE215788 | GEO
Project description:In the current study we have evaluated the hypothesis that myelomatous plasma cells (mPCs) might simultaneously gain the gene expression pattern acquired by a normal plasma cell (PC) along its maduration process but without losing the expression pattern displayed by memory B cells (MBCs) which confer these cells their long-term viability. Thus, mPCs would aberrantly share both activation and anti-apoptotic gene expression patterns from PCs and MBCs counterparts, respectively. This information may be an important contribution to the field of multiple myeloma (MM) research.
2014-12-31 | GSE62188 | GEO