RESUMO
Erythroid cells, serving as progenitors and precursors to erythrocytes responsible for oxygen transport, were shown to exhibit an immunosuppressive and immunoregulatory phenotype. Previous investigations from our research group have revealed an antimicrobial gene expression profile within murine bone marrow erythroid cells which suggested a role for erythroid cells in innate immunity. In the present study, we focused on elucidating the characteristics of human bone marrow erythroid cells through comprehensive analyses, including NanoString gene expression profiling utilizing the Immune Response V2 panel, a BioPlex examination of chemokine and TGF-beta family proteins secretion, and analysis of publicly available single-cell RNA-seq data. Our findings demonstrate that an erythroid cell subpopulation manifests a myeloid-like gene expression signature comprised of antibacterial immunity and neutrophil chemotaxis genes which suggests an involvement of human erythroid cells in the innate immunity. Furthermore, we found that human erythroid cells secreted CCL22, CCL24, CXCL5, CXCL8, and MIF chemokines. The ability of human erythroid cells to express these chemokines might facilitate the restriction of immune cells in the bone marrow under normal conditions or contribute to the ability of erythroid cells to induce local immunosuppression by recruiting immune cells in their immediate vicinity in case of extramedullary hematopoiesis.
Assuntos
Células Eritroides , Monócitos , Humanos , Monócitos/metabolismo , Monócitos/citologia , Monócitos/imunologia , Células Eritroides/metabolismo , Células Eritroides/citologia , Imunidade Inata , Fatores Inibidores da Migração de Macrófagos/genética , Fatores Inibidores da Migração de Macrófagos/metabolismo , Células da Medula Óssea/metabolismo , Células da Medula Óssea/citologia , Transcriptoma , Perfilação da Expressão Gênica , Quimiocina CXCL5/metabolismo , Quimiocina CXCL5/genética , Células Mieloides/metabolismo , Quimiocinas/metabolismo , Quimiocinas/genética , Interleucina-8 , Oxirredutases IntramolecularesRESUMO
Erythroid Krüppel-like factor (KLF1), first discovered in 1992, is an erythroid-restricted transcription factor (TF) that is essential for terminal differentiation of erythroid progenitors. At face value, KLF1 is a rather inconspicuous member of the 26-strong SP/KLF TF family. However, 30 years of research have revealed that KLF1 is a jack of all trades in the molecular control of erythropoiesis. Initially described as a one-trick pony required for high-level transcription of the adult HBB gene, we now know that it orchestrates the entire erythroid differentiation program. It does so not only as an activator but also as a repressor. In addition, KLF1 was the first TF shown to be directly involved in enhancer/promoter loop formation. KLF1 variants underlie a wide range of erythroid phenotypes in the human population, varying from very mild conditions such as hereditary persistence of fetal hemoglobin and the In(Lu) blood type in the case of haploinsufficiency, to much more serious non-spherocytic hemolytic anemias in the case of compound heterozygosity, to dominant congenital dyserythropoietic anemia type IV invariably caused by a de novo variant in a highly conserved amino acid in the KLF1 DNA-binding domain. In this chapter, we present an overview of the past and present of KLF1 research and discuss the significance of human KLF1 variants.
Assuntos
Eritropoese , Fatores de Transcrição Kruppel-Like , Fatores de Transcrição Kruppel-Like/genética , Fatores de Transcrição Kruppel-Like/metabolismo , Humanos , Eritropoese/genética , Animais , Diferenciação Celular/genética , Células Eritroides/metabolismo , Células Eritroides/citologia , MutaçãoRESUMO
During hematopoiesis, megakaryocytic erythroid progenitors (MEPs) differentiate into megakaryocytic or erythroid lineages in response to specific transcriptional factors, yet the regulatory mechanism remains to be elucidated. Using the MEPlike cell line HEL western blotting, RTqPCR, lentivirusmediated downregulation, flow cytometry as well as chromatin immunoprecipitation (ChIp) assay demonstrated that the E26 transformationspecific (ETS) transcription factor friend leukemia integration factor 1 (Fli1) inhibits erythroid differentiation. The present study using these methods showed that while FLI1mediated downregulation of GATA binding protein 1 (GATA1) suppresses erythropoiesis, its direct transcriptional induction of GATA2 promotes megakaryocytic differentiation. GATA1 is also involved in megakaryocytic differentiation through regulation of GATA2. By contrast to FLI1, the ETS member erythroblast transformationspecificrelated gene (ERG) negatively controls GATA2 and its overexpression through exogenous transfection blocks megakaryocytic differentiation. In addition, FLI1 regulates expression of LIM Domain Binding 1 (LDB1) during erythroid and megakaryocytic commitment, whereas shRNAmediated depletion of LDB1 downregulates FLI1 and GATA2 but increases GATA1 expression. In agreement, LDB1 ablation using shRNA lentivirus expression blocks megakaryocytic differentiation and modestly suppresses erythroid maturation. These results suggested that a certain threshold level of LDB1 expression enables FLI1 to block erythroid differentiation. Overall, FLI1 controlled the commitment of MEP to either erythroid or megakaryocytic lineage through an intricate regulation of GATA1/GATA2, LDB1 and ERG, exposing multiple targets for cell fate commitment and therapeutic intervention.
Assuntos
Diferenciação Celular , Células Eritroides , Megacariócitos , Humanos , Diferenciação Celular/genética , Linhagem Celular , Células Eritroides/metabolismo , Células Eritroides/citologia , Fator de Transcrição GATA1/metabolismo , Fator de Transcrição GATA1/genética , Fator de Transcrição GATA2/metabolismo , Fator de Transcrição GATA2/genética , Regulação da Expressão Gênica , Proteínas com Domínio LIM/metabolismo , Proteínas com Domínio LIM/genética , Megacariócitos/metabolismo , Megacariócitos/citologia , Proteína Proto-Oncogênica c-fli-1/metabolismo , Proteína Proto-Oncogênica c-fli-1/genética , Regulador Transcricional ERG/metabolismo , Regulador Transcricional ERG/genéticaRESUMO
G protein pathway suppressor 2 (GPS2) has been shown to play a pivotal role in human and mouse definitive erythropoiesis in an EKLF-dependent manner. However, whether GPS2 affects human primitive erythropoiesis is still unknown. This study demonstrated that GPS2 positively regulates erythroid differentiation in K562 cells, which have a primitive erythroid phenotype. Overexpression of GPS2 promoted hemin-induced hemoglobin synthesis in K562 cells as assessed by the increased percentage of benzidine-positive cells and the deeper red coloration of the cell pellets. In contrast, knockdown of GPS2 inhibited hemin-induced erythroid differentiation of K562 cells. GPS2 overexpression also enhanced erythroid differentiation of K562 cells induced by cytosine arabinoside (Ara-C). GPS2 induced hemoglobin synthesis by increasing the expression of globin and ALAS2 genes, either under steady state or upon hemin treatment. Promotion of erythroid differentiation of K562 cells by GPS2 mainly relies on NCOR1, as knockdown of NCOR1 or lack of the NCOR1-binding domain of GPS2 potently diminished the promotive effect. Thus, our study revealed a previously unknown role of GPS2 in regulating human primitive erythropoiesis in K562 cells.
Assuntos
Diferenciação Celular , Eritropoese , Hemina , Leucemia Eritroblástica Aguda , Correpressor 1 de Receptor Nuclear , Humanos , Células K562 , Eritropoese/genética , Leucemia Eritroblástica Aguda/patologia , Leucemia Eritroblástica Aguda/metabolismo , Leucemia Eritroblástica Aguda/genética , Correpressor 1 de Receptor Nuclear/metabolismo , Correpressor 1 de Receptor Nuclear/genética , Hemina/farmacologia , Células Eritroides/metabolismo , Células Eritroides/citologia , 5-Aminolevulinato Sintetase/genética , 5-Aminolevulinato Sintetase/metabolismo , Hemoglobinas/metabolismo , Técnicas de Silenciamento de Genes , Peptídeos e Proteínas de Sinalização IntracelularRESUMO
Precise insertion of fluorescent tags by CRISPR-Cas9-mediated homologous recombination (HR) in mammalian genes is a powerful tool allowing to study gene function and protein gene products. Here, we present a protocol for efficient HR-mediated targeted insertion of fluorescent markers in the genome of hard-to-transfect erythroid cell lines MEL (mouse erythroleukemic) and MEDEP (mouse ES cell-derived erythroid progenitor line). We describe steps for plasmid construction, electroporation, amplification, and verification of genome editing. We then detail procedures for isolating positive clones and validating knockin clones. For complete details on the use and execution of this protocol, please refer to Deleuze et al.1.
Assuntos
Sistemas CRISPR-Cas , Células Eritroides , Edição de Genes , Técnicas de Introdução de Genes , Sistemas CRISPR-Cas/genética , Animais , Camundongos , Células Eritroides/metabolismo , Células Eritroides/citologia , Técnicas de Introdução de Genes/métodos , Edição de Genes/métodos , Transfecção/métodos , Linhagem Celular , Recombinação Homóloga/genética , Eletroporação/métodosRESUMO
Destruction of erythropoiesis process leads to various diseases, including thrombocytopenia, anaemia, and leukaemia. miR-429-CT10 regulation of kinase-like (CRKL) axis involved in development, progression and metastasis of cancers. However, the exact role of miR-429-CRKL axis in leukaemic cell differentiation are still unknown. The current work aimed to uncover the effect of miR-429-CRKL axis on erythropoiesis. In the present study, CRKL upregulation was negatively correlated with miR-429 downregulation in both chronic myeloid leukaemia (CML) patient and CR patient samples. Moreover, CRKL expression level was significantly decreased while miR-429 expression level was increased during the erythroid differentiation of K562 cells following hemin treatment. Functional investigations revealed that overexpression and knockdown of CRKL was remarkably effective in suppressing and promoting hemin-induced erythroid differentiation of K562 cells, whereas, miR-429 exhibited opposite effects to CRKL. Mechanistically, miR-429 regulates erythroid differentiation of K562 cells by downregulating CRKL via selectively targeting CRKL-3'-untranslated region (UTR) through Raf/MEK/ERK pathway. Conversely, CRKII had no effect on erythroid differentiation of K562 cells. Taken together, our data demonstrated that CRKL (but not CRKII) and miR-429 contribute to development, progression and erythropoiesis of CML, miR-429-CRKL axis regulates erythropoiesis of K562 cells via Raf/MEK/ERK pathway, providing novel insights into effective diagnosis and therapy for CML patients.
Assuntos
Proteínas Adaptadoras de Transdução de Sinal , Diferenciação Celular , Células Eritroides , Hemina , Leucemia Mielogênica Crônica BCR-ABL Positiva , MicroRNAs , Proteínas Proto-Oncogênicas c-crk , Humanos , Regiões 3' não Traduzidas , Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Proteínas Adaptadoras de Transdução de Sinal/genética , Diferenciação Celular/efeitos dos fármacos , Células Eritroides/metabolismo , Células Eritroides/efeitos dos fármacos , Células Eritroides/patologia , Células Eritroides/citologia , Eritropoese/genética , Eritropoese/efeitos dos fármacos , Regulação Leucêmica da Expressão Gênica/efeitos dos fármacos , Hemina/farmacologia , Células K562 , Leucemia Mielogênica Crônica BCR-ABL Positiva/patologia , Leucemia Mielogênica Crônica BCR-ABL Positiva/genética , Leucemia Mielogênica Crônica BCR-ABL Positiva/metabolismo , Sistema de Sinalização das MAP Quinases/efeitos dos fármacos , MicroRNAs/genética , MicroRNAs/metabolismo , Proteínas Proto-Oncogênicas c-crk/metabolismo , Proteínas Proto-Oncogênicas c-crk/genéticaRESUMO
Erythropoiesis in the adult bone marrow relies on mitochondrial membrane transporters to facilitate heme and hemoglobin production. Erythrocytes in the bone marrow are produced although the differentiation of erythroid progenitor cells that originate from hematopoietic stem cells (HSCs). Whether and how mitochondria transporters potentiate HSCs and affect their differentiation toward erythroid lineage remains unclear. Here, we show that the ATP-binding cassette (ABC) transporter 10 (Abcb10), located on the inner mitochondrial membrane, is essential for HSC maintenance and erythroid-lineage differentiation. Induced deletion of Abcb10 in adult mice significantly increased erythroid progenitor cell and decreased HSC number within the bone marrow (BM). Functionally, Abcb10-deficient HSCs exhibited significant decreases in stem cell potential but with a skew toward erythroid-lineage differentiation. Mechanistically, deletion of Abcb10 rendered HSCs with excess mitochondrial iron accumulation and oxidative stress yet without alteration in mitochondrial bioenergetic function. However, impaired hematopoiesis could not be rescued through the in vivo administration of a mitochondrial iron chelator or antioxidant to Abcb10-deficient mice. Abcb10-mediated mitochondrial iron transfer is thus pivotal for the regulation of physiologic HSC potential and erythroid-lineage differentiation.
Assuntos
Transportadores de Cassetes de Ligação de ATP , Diferenciação Celular , Eritropoese , Células-Tronco Hematopoéticas , Camundongos Knockout , Mitocôndrias , Animais , Camundongos , Células-Tronco Hematopoéticas/metabolismo , Células-Tronco Hematopoéticas/citologia , Transportadores de Cassetes de Ligação de ATP/genética , Transportadores de Cassetes de Ligação de ATP/metabolismo , Mitocôndrias/metabolismo , Eritropoese/genética , Ferro/metabolismo , Células Eritroides/citologia , Células Eritroides/metabolismo , Estresse Oxidativo , Células Precursoras Eritroides/metabolismo , Células Precursoras Eritroides/citologia , Camundongos Endogâmicos C57BLRESUMO
Capsaicin, the pungent component of chilli peppers, is known to induce mediators of hematopoiesis. We investigated the effect of capsaicin on hematopoiesis in mouse progenitor cells. Treatment of mouse bone marrow cells with capsaicin induced the formation of colony of burst-forming units-erythroid (BFU-E). We also found that the number of erythropoietin receptor (EpoR)-positive cells was increased by capsaicin. To clarify the effect of capsaicin on erythroid lineage, BFU-E colonies were separated from non-BFU-E colonies by colony-picking after in vitro culture of mouse bone marrow cells. Quantitative RT-PCR analysis revealed that capsaicin stimulated the expression of the erythroid-specific genes encoding EpoR, glycophorin A (GPA), beta-globin (Hbb-b1), GATA-1, PU.1, nuclear factor erythroid-derived 2 (NF-E2), and Kruppel-like factor 1 (KLF1) in the BFU-E colonies. Furthermore, capsaicin could effectively stimulate the transfected GATA-1 promoter in K562 cells. GATA-1 is known as an essential transcription factor for the development of erythroid cells. Our results show that development of the erythroid lineage from bone marrow cells can be induced by treatment with capsaicin, and that GATA-1 seems to play a role in this induced erythroid maturation.
Assuntos
Animais , Masculino , Camundongos , Células da Medula Óssea/citologia , Capsaicina/farmacologia , Linhagem da Célula , Células Cultivadas , Ensaio de Unidades Formadoras de Colônias , Células Eritroides/citologia , Fator de Transcrição GATA1/genética , Hematopoese , Células-Tronco Hematopoéticas/citologia , Camundongos Endogâmicos C57BL , Regiões Promotoras Genéticas , Receptores da Eritropoetina/metabolismoRESUMO
Properly metabolized globin synthesis and iron uptake are indispensable for erythroid cell differentiation and maturation. Mitochondrial participation is crucial in the process of haeme synthesis for cytochromes and haemoglobin. We studied the final biosynthesis site of haemoglobin using an ultrastructural approach, with erythroid cells obtained from rabbit embryos, in order to compare these results with those of animals treated with saponine or phenylhydrazine. Our results are similar to those obtained in assays with adult mammals, birds, amphibians, reptiles and fish, after induction of haemolytic anaemia. Therefore, the treatment did not interfere with the process studied, confirming our previous findings. Immunoelectron microscopy showed no labelling of mitochondria or other cellular organelles supposedly involved in the final biosynthesis of haemoglobin molecules, suggesting instead that it occurs free in the cytoplasm immediately after the liberation of haeme from the mitochondria, by electrostatic attraction between haeme and globin chains.