Consulta: subjectFacets:"Cell differentiation"
Registros recuperados: 12
Data/hora: 19/05/2024 01:27:05

A unique mechanism of nuclear division in Giardia lamblia involves components of the ventral disk and the nuclear envelope
Provedor de dados: Biocell
Autores: Solari,Alberto J.; Rahn,Monica I.; Saura,Alicia; Lujan,Hugo D.
The fine structure of the binucleate, parasitic protist Giardia lamblia during interphase and divisional stages was studied by serial thin sectioning and three-dimensional reconstructions. The earlier sign of nuclear division is the development of a few peripheral areas of densely packed chromatin directly attached to the inner nuclear envelope. An intracytoplasmic sheet of ventral disk components grows from the cell periphery towards one of the nuclei, apparently constricting this nucleus, which becomes located at a ventral bulge. After the basal bodies become duplicated, a full nuclear division occurs in trophozoites, giving two pairs of parent-daughter nuclei. This full division occurs in a dorsal-ventral direction, with the resulting nuclear pairs...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Giardia; Primitive mitosis; Fine structure of mitosis; Protist mitosis; Cell differentiation.
Ano: 2003
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452003000300004

Caractérisation et variation phénotypique et biologique des deux sexes du sandre "Sander lucioperca" (l., 1758) (teleosteen, percidae) dans la retenue de barrage de Nebhana (Tunisie Centrale).
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Turki, O.; M'Hetli, M.; Chriki, A.; Kraiem, M.M.
Dans le but de caractériser phénotypiquement et biologiquement la population de sandre (Sander lucioperca (L, 1758)), et de détecter une éventuelle variabilité entre les sexes, une étude des variables méristiques et morphométriques ainsi que la croissance, a concerné 133 mâles et 166 femelles issus de la retenue de barrage de Nebhana. Le choix des variables méristiques et morphométriques a été décelé à partir de travaux bibliographiques montrant un taux important de variabilité chez les poissons marins et d'eau douce. Ainsi 9 caractères méristiques et 23 variables morphométriques ont été retenus. Les résultats ont montré une invariance des caractères méristiques entre les mâles et les femelles. Quant aux rapports morphométriques, les mâles diffèrent des...
Tipo: Journal Contribution
Palavras-chave: Animal morphology; Biological data; Cell differentiation; Comparative studies; Freshwater fish; Growth; Meristic counts; Morphometry; Phenotypes; Phenotypic variations; Population structure; Water reservoirs; Sex; Sex characters; Marine fisheries; Pike perch.
Ano: 2009
URL: http://hdl.handle.net/1834/4748

Différenciation génétique des espèces de Chrysichthys de la rivière Bia.
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Ouattara, T.A.S.; Adepo-Gouréné, A.B.; Atsé, B.C.
Ces résultats nous laissent supposer que dans la Bia, nous avons plus de deux espèces de Chrysichthys. Soit, nous avons quatre espèces assez distinctes les unes des autres mais dont trois sont assez proches de par leurs caractères morphologiques soit, nous avons des espèces hybrides des deux espèces jusque là connus et une troisième espèce non encore répertoriée dans la Bia. Ce travail préliminaire méritait d'être poursuivi avec un nombre plus élevé de spécimens et l'étude d'un plus grand nombre de systèmes enzymatiques. A la différenciation génétique, seront associée une étude morphologique et morphométrique. Cette étude s'avère d'autant plus importante qu'elle porte sur des espèces de poissons intéressant l'aquaculture en Côte d'Ivoire et en général en...
Tipo: Journal Contribution
Palavras-chave: Fish species; Cell differentiation.
Ano: 2010
URL: http://hdl.handle.net/1834/5779

Differential regulation of vitamin D receptor expression in distinct leukemic cell lines upon phorbol ester-induced growth arrest
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Folgueira,M.A.A.K.; Federico,M.H.H.; Roela,R.A.; Maistro,S.; Katayama,M.L.H.; Brentani,M.M.
A close correlation between vitamin D receptor (VDR) abundance and cell proliferation rate has been shown in NIH-3T3 fibroblasts, MCF-7 breast cancer and in HL-60 myeloblastic cells. We have now determined if this association occurs in other leukemic cell lines, U937 and K562, and if VDR content is related to c-myc expression, which is also linked to cell growth state. Upon phorbol myristate acetate (PMA) treatment, cells from the three lineages (HL-60, U937 and K562) differentiated and expressed specific surface antigens. All cell lines analyzed were growth inhibited by PMA and the doubling time was increased, mainly due to an increased fraction of cells in the G0/G1 phase, as determined by flow cytometry measurements of incorporated bromodeoxyuridine and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Receptors; Calcitriol; Cell division; Cell differentiation; Leukemia; Phorbol esters.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000500011

Immunophenotyping, plasticity tests and nanotagging of stem cells derived from adipose tissue of wild rodent agouti (Dasyprocta prymnolopha)
Provedor de dados: Arquivo Brasileiro de Medicina Veterinária e Zootecnia
Autores: Rocha,A.R.; Leite,Y.K.C.; Silva,A.S.; Conde Júnior,A.M.; Costa,C.R.M.; Silva,G.C.; Bezerra,D.O.; Cavalcante,M.M.A.S.; Feitosa,M.L.T.; Argôlo Neto,N.M.; Serakides,R.; Carvalho,M.A.M.
ABSTRACT There is a growing interest in the study of unspecialized mesenchymal stem cells, for there are still some discussions about their in vitro behavior. Regenerative medicine is a science undergoing improvement which develops treatments as cell therapy using somatic stem cells. In several studies, adipose tissue is presented as a source of multipotent adult cells that has several advantages over other tissue sources. This study aimed to characterize and evaluate the tagging of mesenchymal stem cells from the agoutis adipose tissue (Dasyprocta prymonolopha), with fluorescent intracytoplasmic nanocrystals. Fibroblast cells were observed, plastic adherent, with extended self-renewal, ability to form colonies, multipotency by differentiation into three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell culture; Mesenchymal; Stem cells; Adipose tissue; Cell differentiation; Fluorescent nanocrystals.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000501571

Isolation and culture of umbilical vein mesenchymal stem cells
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Covas,D.T.; Siufi,J.L.C.; Silva,A.R.L.; Orellana,M.D.
Bone marrow contains a population of stem cells that can support hematopoiesis and can differentiate into different cell lines including adipocytes, osteocytes, chondrocytes, myocytes, astrocytes, and tenocytes. These cells have been denoted mesenchymal stem cells. In the present study we isolated a cell population derived from the endothelium and subendothelium of the umbilical cord vein which possesses morphological, immunophenotypical and cell differentiation characteristics similar to those of mesenchymal stem cells isolated from bone marrow. The cells were isolated from three umbilical cords after treatment of the umbilical vein lumen with collagenase. The cell population isolated consisted of adherent cells with fibroblastoid morphology which, when...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Mesenchymal stem cells; Umbilical vein; Adipocytes; Osteocytes; Cell differentiation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000900006

Isolation of stem cells from adult rat kidneys
Provedor de dados: Biocell
Autores: Gheisari,Yousof; Soleimani,Masoud; Zeinali,Sirous; Arefian,Ehsan; Atashi,Amir; Nikougoftar Zarif,Mahin.
The kidney has an inherent ability for recovery and regeneration following acute damage. However, there has been much contention as to the source of regenerating renal cells. The aim of this study was to isolate and characterize these cells. Normal rat kidneys were minced and cells were isolated with collagenase I and were cultured in an expansion medium. Adherent cells were isolated and expanded for more than 120 days in vitro. These cells had the potential of translineage differentiation into neural cells, adipocytes and osteocytes. These cells also expressed Nucleostemin, Cyclin D1, Notch1 and Survivin which are commonly expressed in stem cells. The results of the current work show that the adult kidney contains a population of multipotent stem cells.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Kidney failure; Regeneration; Cell differentiation; Renal replacement therapy.
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452009000100004

NFAT transcription factors: from cell cycle to tumor development
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Viola,J.P.B.; Carvalho,L.D.S.; Fonseca,B.P.F.; Teixeira,L.K.
The nuclear factor of activated T cells (NFAT) family of transcription factors has been primarily identified in immune cells; however, these proteins have been recently found to be functionally active in several other non-immune cell types. NFAT proteins are activated upon different stimuli that lead to increased intracellular calcium levels. Regardless of their widely known cytokine gene expression properties, NFATs have been shown to regulate other genes related to cell cycle progression, cell differentiation and apoptosis, revealing a broader role for these proteins in normal cell physiology. Several reports have addressed the participation of NFATs in many aspects of malignant cell transformation and tumorigenic processes. In this review, we will...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NFAT; Cell cycle; Cancer; Cell differentiation; Gene expression.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000300003

Sequential expressions of Notch1, Jagged2 and Math1 in molar tooth germ of mouse
Provedor de dados: Biocell
Autores: Borkosky,Silvia S.; Nagatsuka,Hitoshi; Orita,Yorihisa; Tsujigiwa,Hidetsugu; Yoshinobu,Junko; Gunduz,Mehmet; Rodriguez,Andrea P.; Missana,Liliana R.; Nishizaki,Kazunori; Nagai,Noriyuki.
The Notch signaling pathway is an evolutionary conserved mechanism that plays an important role in cell-cell communication and cell fate in a wide range of tissues. The mammalian family of Notch receptors consists of 4 members: Notch1/2/3/4. The Notch ligand family consists of 5 members: Delta1/3/4 and Jagged1/2. Math1 encodes a murine basic helix-loop-helix (bHLH) transcription factor that acts as positive regulator of cell differentiation. Recently, links between Notch and Math1 pathways were demonstrated in various tissues. Expression of Notch1, Jagged2 and Math1 were analyzed in the mouse molar tooth germ during embryonic stage (E) 13 and E15 and during postnatal stage (PN) 1, PN3, PN5, PN10 and PN14 by using in situ hybridization. Positive Notch1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Notch signaling; Odontogenesis; Cell differentiation; Molar morphogenesis.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452008000300006

Signal transduction, cell division, differentiation and development: towards unifying mechanisms for pattern formation in plants
Provedor de dados: Brazilian Journal of Plant Physiology
Autores: Dornelas,Marcelo Carnier.
The elaboration of plant form and function depends on the ability of a plant cell to divide and differentiate. The decisions of individual cells to enter the cell cycle, maintain proliferation competence, become quiescent, expand, differentiate, or die depend on cell-to-cell communication and on the perception of various signals. These signals can include hormones, nutrients, light, temperature, and internal positional and developmental cues. In recent years, progress has been made in understanding the molecular control of plant pattern formation, especially in the model plant Arabidopsis thaliana. Furthermore, specific genes have been found that are necessary for normal pattern formation and the control of the rates of cell division and differentiation....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell differentiation; Developmental genetics; Transduction pathways.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000100001

The neural crest stem cells: control of neural crest cell fate and plasticity by endothelin-3
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: DUPIN,ELISABETH; REAL,CARLA; LeDOUARIN,NICOLE.
How the considerable diversity of neural crest (NC)-derived cell types arises in the vertebrate embryo has long been a key question in developmental biology. The pluripotency and plasticity of differentiation of the NC cell population has been fully documented and it is well-established that environmental cues play an important role in patterning the NC derivatives throughout the body. Over the past decade, in vivo and in vitro cellular approaches have unravelled the differentiation potentialities of single NC cells and led to the discovery of NC stem cells. Although it is clear that the final fate of individual cells is in agreement with their final position within the embryo, it has to be stressed that the NC cells that reach target sites are pluripotent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neural crest; Avian embryo; Cell differentiation; Endothelin3; Peripheral nervous system; Melanocytes; Schwann cells; Mesectoderm.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400007

VP22 herpes simplex virus protein can transduce proteins into stem cells
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Gabanyi,I.; Lojudice,F.H.; Kossugue,P.M.; Rebelato,E.; Demasi,M.A.; Sogayar,M.C.
The type I herpes simplex virus VP22 tegument protein is abundant and well known for its ability to translocate proteins from one cell to the other. In spite of some reports questioning its ability to translocate proteins by attributing the results observed to fixation artifacts or simple attachment to the cell membrane, VP22 has been used to deliver several proteins into different cell types, triggering the expected cell response. However, the question of the ability of VP22 to enter stem cells has not been addressed. We investigated whether VP22 could be used as a tool to be applied in stem cell research and differentiation due to its capacity to internalize other proteins without altering the cell genome. We generated a VP22.eGFP construct to evaluate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: VP22 protein delivery; Protein transducing domain; EGFP; Stem cells transduction; Cell differentiation.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000200121