scholarly journals On scoring cytokinetic and binucleated cells

2017 ◽  
Vol 91 (7) ◽  
pp. 655-656
Author(s):  
Bogdan I. Gerashchenko
Keyword(s):  
Development ◽  
1983 ◽  
Vol 75 (1) ◽  
pp. 271-291
Author(s):  
O. G. Stroeva ◽  
I. G. Panova

The postnatal proliferative activity of retinal pigment epithelium (RPE) cells and its dependence on intraocular pressure were studied using [3H]thymidine and [14C]thymidine autoradiography in normal and experimentally induced microphthalmic pigmented rats. The regulation of RPE growth by intraocular pressure was shown to involve the control of the number of binucleated cells by means of stimulation of cell entry into the S phase of the cell cycle. Binucleated cells in the rat RPE are formed by acy to kinetic mitoses between days 2 and 9. The significance of the postnatal proliferation and formation of binucleated cells in the RPE is discussed in terms of the specificity of the G2 phase for melanotropic hormone action on RPE differentiation.


2008 ◽  
Vol 5 (2) ◽  
pp. 166-172
Author(s):  
Baghdad Science Journal

The effect of insecticide lamda cyhalothrin on Allium cepa L.root meristem were studied cytogenetically .Using three concentrations of the insecticide 5%, 7.5%, 10% at 6,12,24hours treatments . The insecticide significantly reduced the mitotic index at all concentrations. Moreover showed its ability to induced C – metaphase in 10% .The effects were also caused chromosome aberration like stickness in anaphase, telophase, binucleated cells, Micronuclei formation. These alternations indicating that this insecticide was effective in producing disturbance of spindle fibers.


2019 ◽  
pp. 71-78

EFECTOS DEL SORBATO DE POTASIO A DIFERENTES CONCENTRACIONES y TIEmPO DE ExPOSICIóN SOBRE EL CICLO CELULAR y EL mATERIAL GENÉTICO EN mERISTEmOS RADICULARES DE AllIuM CEPA l. (CEBOLLA) EFFECT OF POTASSIUm SORBATE AT DIFFERENT CONCENTRATIONS AND ExPOSURE TImE ON THE CELL CyCLE AND THE GENETIC mATERIAL IN ROOT mERISTEmS OF AllIuM CEPA l “ONION” Joselyne Quispe, José Saldaña, Tony Verde y Shirley Valderrama Universidad Nacional de Trujillo, Trujillo,Perú DOI: https://doi.org/10.33017/RevECIPeru2010.0011/ RESUMEN Con el propósito de determinar el efecto del Sorbato de Potasio sobre el ciclo celular en meristemos radiculares de Allium cepa L. “cebolla” se establecieron tres grupos experimentales que se expusieron a las soluciones de Sorbato de Potasio en concentraciones de 0.5, 1 y 2 g/L; por 6, 7 y 8 horas cada una y un grupo control. Luego se realizó la respectiva coloración en Orceína acética al 2% de acuerdo a la técnica de Tjio y Levan, observándose con el microscopio compuesto un total de 1500 células meristemáticas en cada uno de los tratamientos. Los resultados aplicando tratamiento después de 8 horas de exposición a la concentración de 2 g/L mostraron una disminución del índice mitótico de 11.26 %, mientras que se incrementó el índice profásico en 95.57 %. Se produjeron también alteraciones como rupturas cromosómicas, puentes anafásicos y células binucleadas. Las pruebas y análisis de varianza, mostraron diferencias significativas entre los diferentes tratamientos, confirmado mediante la prueba de comparación múltiple de promedios de Duncan. Se evidencia un probable efecto genotóxico en el material genético por el Sorbato de Potasio y una alteración en el ciclo celular de los meristemos de A. cepa L.; así mismo, se comprueba la función de biosensor de A. cepa L. en el estudio de sustancias que puedan afectar el ciclo celular. Palabras clave: Allium cepa, Sorbato de Potasio, Índice Mitótico, Alteración del material genético, Puentes anafásicos, Rupturas cromosómicas, Células binucleadas. ABSTRACT In order to determine the effect of Potassium Sorbate on the cell cycle in root meristems of Allium cepa L. “onion” set three experimental groups were exposed to solutions of Potassium Sorbate at concentrations of 0.5, 1 and 2g /l, for 6, 7 and 8 hours each and a control group. Later the respective color in 2% Acetic orcein according to the technique of Tjio and Levan, observed with the compound microscope a total of 1500 meristematic cells in each of the treatments. The appropriate treatment results after 8 hours of exposure to the concentration of 2 g / L showed a decrease in mitotic index of 11.26%, while it increased the rate at 95.57% prophasic index. There were also alterations as chromosome breaks, anaphasic bridges and binucleated cells. The tests and analysis of variance showed significant differences between the different treatments, as confirmed by multiple comparison test of Duncan averages. It shows a probable genotoxic effect in the genetic material by Potassium Sorbate and an alteration in the cell cycle of meristems of A. cepa L., likewise, is found biosensor function of A. cepa L. in the study of substances that may affect the cell cycle. Keywords: Allium cepa, Potassium Sorbate, Mitotic index, Abnormal genetic material, Chromosomal breaks, Anafasic bridges, Binucleated cells.


2008 ◽  
Vol 76 (6) ◽  
pp. 2368-2378 ◽  
Author(s):  
Shubhra Majumder ◽  
Anuradha Lohia

ABSTRACT The formin family of proteins mediates dynamic changes in actin assembly in eukaryotes, and therefore it is important to understand the function of these proteins in Entamoeba histolytica, where actin forms the major cytoskeletal network. In this study we have identified the formin homologs encoded in the E. histolytica genome based on sequence analysis. Using multiple tools, we have analyzed the primary sequences of the eight E. histolytica formins and discovered three subsets: (i) E. histolytica formin-1 to -3 (Ehformin-1 to -3), (ii) Ehformin-4, and (iii) Ehformin-5 to -8. Two of these subsets (Ehformin-1 to -3 and Ehformin-4) showed significant sequence differences from their closest homologs, while Ehformin-5 to -8 were unique among all known formins. Since Ehformin-1 to -3 showed important sequence differences from Diaphanous-related formins (DRFs), we have studied the functions of Ehformin-1 and -2 in E. histolytica transformants. Like other DRFs, Ehformin-1 and -2 associated with F-actin in response to serum factors, in pseudopodia, in pinocytic and phagocytic vesicles, and at cell division sites. Ehformin-1 and -2 also localized with the microtubular assembly in the nucleus, indicating their involvement in genome segregation. While increased expression of Ehformin-1 and -2 did not affect phagocytosis or motility, it clearly showed an increase in the number of binucleated cells, the number of nuclei in multinucleated cells, and the average DNA content of each nucleus, suggesting that these proteins regulate both mitosis and cytokinesis in E. histolytica.


1941 ◽  
Vol 48 (1) ◽  
pp. 274-278 ◽  
Author(s):  
W. Heymann ◽  
W. B. Wartman
Keyword(s):  

2002 ◽  
Vol 13 (10) ◽  
pp. 3532-3545 ◽  
Author(s):  
Mark C. Surka ◽  
Christopher W. Tsang ◽  
William S. Trimble

Cytokinesis in animal cells involves the contraction of an actomyosin ring formed at the cleavage furrow. Nuclear division, or karyokinesis, must be precisely timed to occur before cytokinesis in order to prevent genetic anomalies that would result in either cell death or uncontrolled cell division. The septin family of GTPase proteins has been shown to be important for cytokinesis although little is known about their role during this process. Here we investigate the distribution and function of the mammalian septin MSF. We show that during interphase, MSF colocalizes with actin, microtubules, and another mammalian septin, Nedd5, and coprecipitates with six septin proteins. In addition, transfections of various MSF isoforms reveal that MSF-A specifically localizes with microtubules and that this localization is disrupted by nocodazole treatment. Furthermore, MSF isoforms localize primarily with tubulin at the central spindle during mitosis, whereas Nedd5 is mainly associated with actin. Microinjection of affinity-purified anti-MSF antibodies into synchronized cells, or depletion of MSF by small interfering RNAs, results in the accumulation of binucleated cells and in cells that have arrested during cytokinesis. These results reveal that MSF is required for the completion of cytokinesis and suggest a role that is distinct from that of Nedd5.


1962 ◽  
Vol 142 (4) ◽  
pp. 443-456 ◽  
Author(s):  
Rita Carrière ◽  
D. Patterson

Hepatology ◽  
1990 ◽  
Vol 11 (2) ◽  
pp. 286-297 ◽  
Author(s):  
Elspeth M. Jack ◽  
Philip Bentley ◽  
Francoise Bieri ◽  
Samar F. Muakkassah-Kelly ◽  
Willy Stäubli ◽  
...  

2016 ◽  
Vol 4 (1) ◽  
pp. 66-69
Author(s):  
V. Kovpak ◽  
O. Kovpak

Cell culture obtained from the pancreas can serve as a source of physiologically competent substitute for primary islets of Langerhans in the treatment of diabetes. However, it is possible to obtain the required number of cells only at long-term cultivation in vitro. Therefore, it is necessary to investigate the risks of neoplastic transformation of cells in vitro before transplantation.Materials and methods. Cell culture was obtained by explant method from pancreas of 12-day-old rats. Cell cultures of the first to sixth passages were used for the cytogenetic analysis. In this study the number of cells with altered karyotype, cells with micronuclei, binucleated cells and the cells in a state of apoptosis were considered, mitotic index was calculated.Results. Aneuploid cells were noted at all passages in an amount of 2.2 % (1st) to 16.6 % (4th). Polyploidy manifested in a population of cells from the second (1.1 %) to the sixth passage (4.4 %) with a maximum at passage four (7.8 %). A significant increase in their number was observed since the second passage (0.3 %). We have seen a significant increase in the number of binucleated cells from the first (0.1 %) to the sixth passage (0.8 %). During the study there was a decrease in mitotic index from the first (2.7 %), to the third passage (1.5 %) and its gradual increase in fourth (1.7 %) and sixth (2.0 %) passages. In addition, there was discovered a small percentage of cells in apoptosis, their number gradually increased to the 4th passage (0.5 %). The 5th-6th passages showed decrease in the number of apoptotic cells to 0.1 %.Conclusion. There have been revealed changes in the rat pancreatic cells culture as aneuploidies, polyploidies and micronuclei, the intensity of which varied depending on the passage. However, karyotype variability of mentioned cell did not exceed the level of spontaneous mutations characteristic of mammalians.


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