Assuntos
Perfilação da Expressão Gênica/métodos , Células Germinativas/metabolismo , Células-Tronco Pluripotentes/metabolismo , Animais , Diferenciação Celular/genética , Linhagem Celular , Proteínas Cromossômicas não Histona , Proteínas de Ligação a DNA/genética , Embrião de Mamíferos/citologia , Proteínas de Homeodomínio/genética , Humanos , Camundongos , Proteína Homeobox Nanog , Fator 3 de Transcrição de Octâmero/genética , Proteínas/genética , Proteínas de Ligação a RNA/genética , Proteínas Repressoras/genética , Células-Tronco/citologia , Fatores de TempoRESUMO
We studied the effect of culturing conditions on the fate of human neural stem cells after transplantation into rat brain. Human neural stem cells cultured in the presence of mitogens without LIF migrated along the ependyma and cerebral vessels of recipients, but to a great extent degenerated by the 20th day after transplantation. Neural stem cells cultured with LIF migrated, apart from the above mentioned pathways, in the cortex and hippocampus, well survived; proliferating cells were retained 30 days after transplantation.
Assuntos
Encéfalo/citologia , Transplante de Células-Tronco , Células-Tronco/fisiologia , Animais , Técnicas de Cultura de Células , Diferenciação Celular , Proliferação de Células , Embrião de Mamíferos/citologia , Humanos , Interleucina-6/farmacologia , Fator Inibidor de Leucemia , Mitógenos/farmacologia , Ratos , Células-Tronco/citologia , Células-Tronco/efeitos dos fármacosAssuntos
Transportadores de Cassetes de Ligação de ATP/metabolismo , Benzimidazóis/farmacocinética , Hepatócitos/fisiologia , Regeneração Hepática/fisiologia , Células-Tronco/fisiologia , Membro 2 da Subfamília G de Transportadores de Cassetes de Ligação de ATP , Transportadores de Cassetes de Ligação de ATP/genética , Transporte Biológico/fisiologia , Núcleo Celular/metabolismo , Separação Celular/métodos , Regulação da Expressão Gênica/fisiologia , Hepatócitos/citologia , Células-Tronco/citologiaAssuntos
Células Epidérmicas , Epiderme/metabolismo , Proteínas de Filamentos Intermediários/metabolismo , Proteínas do Tecido Nervoso/metabolismo , Diferenciação Celular , Células Cultivadas , Humanos , Queratinócitos/citologia , Queratinócitos/metabolismo , Microscopia Confocal , Nestina , Células-Tronco/citologia , Células-Tronco/metabolismoRESUMO
The expression of regulatory genes of the POU, Pax, Prox, and Ptx gene families was studied at the initial stages of differentiation of murine embryonic stem cells of R1 line. mRNAs were isolated from undifferentiated embryonic stem cells and embryoid bodies formed at the early stages of in vitro differentiation and cDNA sequences were synthesized for comparative PCR analysis of the expression of studied genes. The levels of expression of the gene Oct-4 involved in maintenance of the pluripotent status of embryonic stem cells proved to be practically indistinguishable in undifferentiated cells and embryoid bodies, while the expression of Pax-6 markedly increased in the latter. The levels and patterns of expression of the homeobox transcription factors Prox-1 and Ptx-2 were compared on this cell model for the first time. A probable role of these genes in differentiation of the murine embryonic stem cells is discussed.
Assuntos
Proteínas de Ligação a DNA/genética , Regulação da Expressão Gênica no Desenvolvimento , Proteínas de Homeodomínio/genética , Proteínas Nucleares , Células-Tronco/fisiologia , Fatores de Transcrição , Animais , Diferenciação Celular/genética , Células Cultivadas , Embrião de Mamíferos/citologia , Proteínas do Olho , Genes Reguladores , Camundongos , Camundongos Endogâmicos , Fator 3 de Transcrição de Octâmero , Fator de Transcrição PAX6 , Fatores de Transcrição Box Pareados , Células-Tronco Pluripotentes/citologia , Células-Tronco Pluripotentes/fisiologia , Reação em Cadeia da Polimerase , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Proteínas Repressoras , Células-Tronco/citologia , Proteínas Supressoras de Tumor , Proteína Homeobox PITX2RESUMO
Effects of ten day long exposure to gamma-irradiation at low doses (mean dose rate of 1.5-2.0 m Gy/day, total dose of 15 m Gy) on hemopoietic (CFU-S) and stromal (CFU-F) progenitor cells from murine bone marrow were examined. The CFU-F content measured as in vitro fibroblastic colony number showed 1.5-4.5-fold increase. Additionally, the size of ectopic marrow transplants evaluated by counting myelokariocytes and CFU-S numbers also increased. No significant changes of CFU-S proliferation rate were found.
Assuntos
Células da Medula Óssea/efeitos da radiação , Animais , Células da Medula Óssea/citologia , Células Cultivadas , Ensaio de Unidades Formadoras de Colônias , Feminino , Fibroblastos/efeitos da radiação , Raios gama , Células-Tronco Hematopoéticas/efeitos da radiação , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Endogâmicos CBA , Doses de Radiação , Células Estromais/efeitos da radiação , Fatores de TempoRESUMO
The formation of hemopoietic colonies on acetate cellulose membranes in the peritoneal cavity of mice was markedly enhanced after the injection of bacterial lipopolysaccharide. In addition to granulocytic-macrophagal differentiation, the foci of erythropoiesis appeared. The stimulating effect of lipopolysaccharide was not expressed in nonirradiated mice and during the formation of hemopoietic foci on acetate cellulose membranes in the subcutaneous connective tissue.
Assuntos
Celulose/análogos & derivados , Celulose/química , Hematopoese Extramedular , Lipopolissacarídeos/química , Membranas Artificiais , Animais , Feminino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Endogâmicos CBAAssuntos
Diferenciação Celular/fisiologia , Células-Tronco Pluripotentes/citologia , Animais , Sequência de Bases , Divisão Celular/fisiologia , Primers do DNA , Embrião de Mamíferos/citologia , Embrião de Mamíferos/fisiologia , Regulação da Expressão Gênica no Desenvolvimento , Hipoxantina Fosforribosiltransferase/genética , CamundongosRESUMO
We studied the formation of hemopoietic colonies on an artificial sublayer in the peritoneal cavity of mice under the influence of stromal sublayers consisting of fibroblasts of six constant cell limes. All studied lines of stromal cells supported the formation of granulocytic foci and some of them supported the formation of erythroid foci as well. It was shown that hemopoiesis was preserved or, in some cases, enhanced on sublayers of fixed (metabolically inactive) cells. The treatment of fibroblasts by E. coli lipopolysaccharide did not lead, as a rule, to significant stimulation of hemopoiesis.
Assuntos
Células Sanguíneas/citologia , Hematopoese/fisiologia , Cavidade Peritoneal/citologia , Células 3T3 , Animais , Células Sanguíneas/efeitos dos fármacos , Linhagem Celular , Transplante de Células , Citocinas/metabolismo , Eritrócitos/efeitos dos fármacos , Escherichia coli , Feminino , Fibroblastos/efeitos dos fármacos , Fibroblastos/metabolismo , Glutaral/farmacologia , Granulócitos/efeitos dos fármacos , Humanos , Lipopolissacarídeos/farmacologia , Camundongos , Camundongos Endogâmicos , Ratos , Células EstromaisRESUMO
We studied the effects of low doses of continuous gamma-irradiation (Co60, 10 days, mean daily dose power 1.5-2.0 mGy, total dose 15 mGy) on hemopoietic and stromal progenitor cells of murine bone marrow. The content of hemopoietic clonogenic cells representing a "younger" (CFU-S-11) and more "mature" (CFU-S-7) categories in the compartment of stem cells was determined in the bone marrow. The state of bone marrow stroma was estimated by the method of in vitro cloning according to the number of progenitor cells that form colonies of fibroblasts (CFU-F) and by the method of ectopic transplantation according to the capacity of stroma of organizing and building new hemopoietic territories. Continuous gamma-irradiation at low doses, that were by one order of magnitude lower than those inducing hermesis, exerted a stimulating effect on both hemopoietic (CFU-S) and stromal (CFU-F) progenitor cells. The number of CFU-S in the compartment of stem cells of the bone marrow markedly increased and they formed larger hemopoietic territories but these cells appeared to create a qualitatively different microenvironment, which stimulated the proliferation of CFU-S.
Assuntos
Células da Medula Óssea/efeitos da radiação , Raios gama , Animais , Células da Medula Óssea/citologia , Transplante de Medula Óssea , Ensaio de Unidades Formadoras de Colônias , Relação Dose-Resposta à Radiação , Extremidades/efeitos da radiação , Feminino , Transplante de Células-Tronco Hematopoéticas , Masculino , Camundongos , Camundongos Endogâmicos , Simulação de Ambiente Espacial , Células Estromais/efeitos da radiaçãoRESUMO
We studied the effects of erythropoietin and thrombopoietin on the clonogenic capacity and direction of differentiation of the hemopoietic cells that form colonies on acetate cellulose membrane in the peritoneal cavity of mice. An increased level of erythropoietin in the blood of recipient mice after blood letting led to the appearance of erythroid colonies upon transplantation of syngeneic hemopoietic cells but did not affect the differentiation of transplanted xenogeneic (guinea pig) hemopoietic cells. Erythropoietin transported top the stromal sublayer by a polymeric carrier also induced erythroid differentiation, while thrombopoietin transported in a similar way somewhat enhanced megakaryocytopoiesis.
Assuntos
Eritropoetina/farmacologia , Cavidade Peritoneal/citologia , Trombopoetina/farmacologia , Animais , Transplante de Medula Óssea , Técnicas de Cultura de Células/métodos , Diferenciação Celular/efeitos dos fármacos , Células Cultivadas , Eritropoetina/sangue , Feminino , Cobaias , Hematopoese , Camundongos , Camundongos Endogâmicos , Polivinil , Células Estromais/efeitos dos fármacos , Trombopoetina/sangue , Transplante Heterólogo , TransplantesRESUMO
Hemopoietic tissues were studied in vertebrates launched aboard the Soviet (Russian) biosatellites ("Cosmos-1129, 1514, 1667, 1887 and 2044"; "Bion-10 and 11") between 1980 and 1996. In the bone marrow of rats exposed to spaceflight conditions, a statistically significant decrease in cell number was revealed in the progenitor cell compartment accounting for the compensatory response of granulocyte-macrophage (CFU-gm) and erythrocyte lineages (BFU-e and CFU-e) and in the compartment of multipotent hemopoietic stem cells (CFU-s), which is responsible for the permanent renewal of hemopoietic tissue. The number of stromal fibroblastic progenitors (CFC-f) in the bone marrow of these rats was also reduced. Apparently, changes in the hemopoietic stroma damage the hemopoietic microenvironment and, hence, may be responsible for changes observed in the hemopoietic tissue proper. Attempts were made to develop methods for analyzing morphologically indiscernible clonogenic hemopoietic cells of newts, and studies on the effects of spaceflight factors on these cells were performed. The results showed that the numbers of clonogenic cells in newts of the flight group newts were significantly lower than in control newts. The data obtained are used as the basis for formulating the problems to be studied, drawing up a program for further research on the effects of spaceflight factors on stem and other clonogenic hemopoietic cells, and developing new experimental models for analyzing stem cells, the state of the hemopoietic stroma, etc.
Assuntos
Células da Medula Óssea/citologia , Fatores Estimuladores de Colônias/metabolismo , Transplante de Células-Tronco Hematopoéticas , Células-Tronco Hematopoéticas/citologia , Voo Espacial , Ausência de Peso , Animais , Células da Medula Óssea/metabolismo , Células da Medula Óssea/fisiologia , Ensaio de Unidades Formadoras de Colônias , Feminino , Granulócitos , Células-Tronco Hematopoéticas/metabolismo , Células-Tronco Hematopoéticas/fisiologia , Fígado/citologia , Masculino , Pleurodeles/sangue , Pleurodeles/fisiologia , Gravidez , Ratos , Ratos Wistar , Baço/citologia , Células EstromaisRESUMO
Morphological and autoradiographic studies on various hemopoietic tissues in sturgeon are presented. The classic hemopoietic organs characteristic of lower vertebrates, such as the kidney and spleen, are studied, as well as unique hemopoietic structures described only in the evolutionarily most ancient fish species (hemopoietic tissues of cartilaginous skull capsules and epicardium). The intensity of cell divisions in hemopoietic foci has been characterized by autoradiography. The results obtained provide a basis for the revision of traditional views about the phylogeny of hemopoiesis. They provide evidence that the osteogenic gravitation of hemopoietic tissue shows up in evolution alongside the appearance of the inner skeleton.
Assuntos
Coração/anatomia & histologia , Hematopoese Extramedular , Intestinos/anatomia & histologia , Fígado/anatomia & histologia , Crânio/anatomia & histologia , Baço/anatomia & histologia , Animais , Evolução Biológica , Peixes/anatomia & histologia , Peixes/fisiologia , Coração/fisiologia , Intestinos/fisiologia , Fígado/fisiologia , Crânio/fisiologia , Baço/fisiologiaRESUMO
Copolymer ethylenevinylacetate is known as a polymeric carrier, which ensures a lasting release of biologically active substances. An attempt has been made to use it for testing the effects of hemopoietic cytokinins. It was shown that erythropoietin, embedded in this polymer, induces formation of erythropoietic foci on acetate-cellulose membranes in the peritoneal cavity of mice.
Assuntos
Citocinas/administração & dosagem , Hematopoese , Polivinil , Animais , Portadores de Fármacos , Eritropoetina/administração & dosagem , CamundongosRESUMO
We present a review of experimental studies performed at the Laboratory of Histogenesis of the Institute of Developmental Biology, Russian Academy of Sciences, on the problem of cell interactions during hemopoiesis. Special attention has been given to original experimental models, such as production of hemopoietic foci on underlayers of fibroblasts encapsulating a foreign body in the peritoneal cavity of rodents (after intraperitoneal transplantation of hemopoietic cells) and repopulation of ectopic hemopoietic territories under the kidney capsule of mice by syngeneic or xenogeneic hemopoietic cells. We describe the competitive interactions of genetically different hemopoietic cells after the transplantation of their mixtures to irradiated mice (multicomponent radiation chimeras). Xenogeneic and multicomponent chimeras have also been obtained in long-term bone marrow culture. We have examined characteristics of hemopoiesis on stromal cell underlayers produced by cells of various origins in vitro and then transplanted into the peritoneal cavity of irradiated mice. We discuss the results obtained and possible mechanisms of these phenomena.
Assuntos
Comunicação Celular , Hematopoese , Células-Tronco Hematopoéticas/citologia , Animais , Células da Medula Óssea/citologia , Diferenciação Celular , Células Cultivadas , Fibroblastos/citologia , Quimera por RadiaçãoRESUMO
We present evidence about the possible use of histochemical NADP diaphorase reaction to visualize elements of the nervous system.
Assuntos
Técnicas Histológicas , NADPH Desidrogenase , Sistema Nervoso/enzimologia , Animais , CamundongosRESUMO
The principal approach was to study hemopoiesis on different stromal cell underlayers (fibroblasts or fibroblast-like cells covering a foreign body implanted into the peritoneal cavity of mice or other rodents) after intraperitoneal transplantation of syngeneic, allogeneic, and xenogeneic hemopoietic cells. The data obtained are compared with the results of experiments on repopulation of ectopic hemopoietic territories (under the mouse kidney capsule) by syngeneic and xenogeneic hemopoietic cells. Competitive cell interactions are described that occur during repopulation of the hemopoietic stroma or formation of the hemopoietic foci on cellulose acetate membranes (CAMs) in the peritoneal cavity of irradiated mice by genetically different hemopoietic cells transplanted to these animals (multicomponent radiation chimeras). The model of xenogeneic and multicomponent radiation chimeras was reproduced in long-term bone marrow cultures, where hemopoietic cells of different genotypes coexisted, without any competitive cell elimination. The second part of this review deals with hemopoiesis on stromal cell underlayers, formed by cells of different origin, different stages of development, and obtained from other sources. These underlayers were formed on CAMs in vitro and then transferred into the peritoneal cavity of irradiated mice, which subsequently received intraperitoneal injections of donor hemopoietic cells. Specific features of hemopoiesis on stromal underlayers formed by the following cell types are described: (1) fibroblasts from mouse embryos at different developmental stages; (2) fibroblasts from the skin, liver, and bone marrow of 17-day mouse fetuses and newborn mice; (3) fibroblasts from the monolayer cultures of mouse and rat bone marrow; (4) 3T3 cell line; (5) hepatocytes of 17-day mouse fetuses or sexually mature rats; (6) newborn mouse kidney cells; and (7) cells transgenic for the erythropoietin gene. The phenomena observed in these experiments and their probable mechanisms are discussed.
Assuntos
Comunicação Celular/fisiologia , Hematopoese/fisiologia , Células-Tronco Hematopoéticas/fisiologia , Animais , Transplante de Medula Óssea , Feminino , Humanos , Masculino , Camundongos , Ratos , Transplante Heterólogo , Células Tumorais CultivadasRESUMO
Cellular NO synthase was assayed in bone marrow, spleen, thymus, lymph nodes, epidermis, hypodermic connective tissue, small gut, peritoneal exudate, liver, kidney, and heart by cytochemical and immunofluorescent methods. As a rule the enzymatic activity was found in differentiated cells that finished proliferation (mature hemopoietic cells, epithelium of gut villi, etc.). The enzyme activity was undetectable in actively reproducing low-differentiated cells (basal layer of the epidermis, crypt cells of the small gut, or blast hemopoietic forms). NO is proposed to participate in regulation of tissue-specific terminal differentiation (maturation) of the cells.
Assuntos
Óxido Nítrico Sintase/metabolismo , Animais , Diferenciação Celular/fisiologia , Técnica Indireta de Fluorescência para Anticorpo , Histocitoquímica , Isoenzimas/metabolismo , CamundongosRESUMO
Ribbed newts were used for studying the effect of space flight on board of the biosatellite (Cosmos-2229) on blood and clonogenic hemopoietic cells. In blood of newts of the flight group, the relative proportion of neutrophils increased, whereas that of lymphocytes and eosinophils decreased. Space flight did not result in loss of the ability of newt blood cells to incorporate H3-thymidine. Analysis of clonogenic hemopoietic cells was performed using the method of hemopoietic colony formation on cellulose acetate membranes implanted into the peritoneal cavity of irradiated newts. To analyze reconstitution of hemopoiesis after irradiation donor hemopoietic cells from flight or control newts were transplanted into irradiated newts whose hemopoietic organs were investigated. The newt can be considered an adequate model for studying hemopoiesis under the conditions of the space flight.