DNA content and expression of cell cycle proteins in caterpillar nuclei from fetal human cardiac myocytes

2002 ◽  
Vol 440 (1) ◽  
pp. 45-49 ◽  
Author(s):  
Hernán García Rivello ◽  
Patricia Cabeza Meckert ◽  
Amelia Gallo ◽  
Luis Palacios ◽  
Rubén P. Laguens
Keyword(s):  
Cell Cycle ◽  
Cardiac Myocytes ◽  
Dna Content ◽  
Cell Cycle Proteins

Cell cycle proteins as molecular markers of malignant change in vulvar lichen sclerosus

2001 ◽  
Vol 11 (2) ◽  
pp. 113-118 ◽  
Author(s):  
K. J. Rolfe ◽  
L. J. Eva ◽  
A. B. Maclean ◽  
J. C. Crow ◽  
C. W. Perrett ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Molecular Markers ◽  
Lichen Sclerosus ◽  
Malignant Change ◽  
Cell Cycle Proteins ◽  
Vulvar Lichen Sclerosus

Proliferative behaviour of high-ploidy cells in two murine tumour lines

1993 ◽  
Vol 104 (1) ◽  
pp. 31-36 ◽  
Author(s):  
C. de la Hoz ◽  
A. Baroja
Keyword(s):  
Cell Cycle ◽  
Dna Content ◽  
Film Studies ◽  
Biological Significance ◽  
Time Lapse ◽  
Proliferative Potential ◽  
Malignant Tumours ◽  
B16f10 Melanoma ◽  
Murine Tumour ◽  
High Ploidy

The presence of high-ploidy cells in malignant tumours has long been documented. However, the biological significance of these cells is not known and there is a great deal of controversy over their proliferative potential. We have analysed the behaviour of these cells in two murine tumour lines, B16F10 melanoma and 3T3A31M angiosarcoma, determining their DNA content by microspectrophotometry and using time-lapse film studies. We have found a discrepancy between the presence of high-ploidy cells in metaphase and the absence of hyperploid telophases. High-ploidy metaphases may be aborted (mitotic polyploidization), prolonged in time or evolve in the form of multipolar, generally tripolar, mitoses. Our results suggest that high-ploidy cells are capable of proliferating, despite certain peculiarities in their cell cycle, and constitute a tumour subpopulation whose role in neoplasia merits further study.

Cell cycle regulatory proteins in renal disease: role in hypertrophy, proliferation, and apoptosis

2000 ◽  
Vol 278 (4) ◽  
pp. F515-F529 ◽  
Author(s):  
Stuart J. Shankland ◽  
Gunter Wolf
Keyword(s):  
Cell Cycle ◽  
Renal Function ◽  
Renal Disease ◽  
Cell Injury ◽  
Critical Role ◽  
Regulatory Proteins ◽  
Specific Cell ◽  
Cell Cycle Proteins ◽  
Proliferation And Apoptosis ◽  
Cell Cycle Regulatory Proteins

The response to glomerular and tubulointerstitial cell injury in most forms of renal disease includes changes in cell number (proliferation and apoptosis) and cell size (hyerptrophy). These events typically precede and may be reponsible for the accumulation of extracellular matrix proteins that leads to a decrease in renal function. There is increasing evidence showing that positive (cyclins and cyclin-dependent kinases) and negative (cyclin-dependent kinase inhibitors) cell cycle regulatory proteins have a critical role in regulating these fundamental cellular responses to immune and nonimmune forms of injury. Data now show that altering specific cell cycle proteins affects renal cell proliferation and improves renal function. Equally exciting is the expanding body of literature showing novel biological roles for cell cycle proteins in the regulation of cell hypertrophy and apoptosis. With increasing understanding of the role for cell cyle regulatory proteins in renal disease comes the hope for potential therapeutic inverventions.

Myocyte enlargement, differentiation, and proliferation kinetics in the fetal sheep heart

2007 ◽  
Vol 102 (3) ◽  
pp. 1130-1142 ◽  
Author(s):  
Sonnet S. Jonker ◽  
Lubo Zhang ◽  
Samantha Louey ◽  
George D. Giraud ◽  
Kent L. Thornburg ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Cardiac Myocytes ◽  
Cardiac Myocyte ◽  
Terminal Differentiation ◽  
Normal Growth ◽  
Mass Gain ◽  
Perinatal Period ◽  
Cross Sectional ◽  
Fetal Sheep ◽  
Cardiac Growth

The generation of new myocytes is an essential process of in utero heart growth. Most, or all, cardiac myocytes lose their capacity for proliferation during the perinatal period through the process of terminal differentiation. An increasing number of studies focus on how experimental interventions affect cardiac myocyte growth in the fetal sheep. Nevertheless, fundamental questions about normal growth of the fetal heart remain unanswered. In this study, we determined that during the last third of gestation the hearts of fetal sheep grew primarily by four processes. 1) Myocyte proliferation contributed substantially to daily cardiac mass gain, and the number of cardiac myocytes continued to increase to term. 2) The (hitherto unrecognized) contribution to cardiac growth by the increase in myocyte size associated with the transition from mononucleation to binucleation (terminal differentiation) became considerable from ∼115 days of gestational age (dGA) until term (145dGA). Because binucleation became the more frequent outcome of myocyte cell cycle activity after ∼115dGA, the number of binucleated myocytes increased at the expense of the number of mononucleated myocytes. Both the interval between nuclear divisions and the duration of cell cycle activity in myocytes decreased substantially during this same period. Finally, cardiac growth was in part due to enlargement of 3) mononucleated and 4) binucleated myocytes, which grew in cross-sectional diameter but not length during the last third of gestation. These data on normal cardiac growth may enable a more detailed understanding of the consequences of experimental and pathological interventions in prenatal life.

Nuclear DNA content and minimum generation time in herbaceous plants

1972 ◽  
Vol 181 (1063) ◽  
pp. 109-135 ◽  
Keyword(s):  
Cell Cycle ◽  
Dna Content ◽  
Cycle Time ◽  
Generation Time ◽  
Nuclear Dna ◽  
Nuclear Dna Content ◽  
Annual Species ◽  
Cell Cycle Time ◽  
Developmental Processes ◽  
The Mean

Many components of cell and nuclear size and mass are correlated with nuclear DNA content in plants, as also are the durations and rates of such developmental processes as mitosis and meiosis. It is suggested that the multiple effects of the mass of nuclear DNA which affect all cells and apply throughout the life of the plant can together determine the minimum generation time for each species. The durations of mitosis and of meiosis are both positively correlated with nuclear DNA content and, therefore, species with a short minimum generation time might be expected to have a shorter mean cell cycle time and mean meiotic duration, and a lower mean nuclear DNA content, than species with a long mean minimum generation time. In tests of this hypothesis, using data collated from the literature, it is shown that the mean cell cycle time and the mean meiotic duration in annual species is significantly shorter than in perennial species. Furthermore, the mean nuclear DNA content of annual species is significantly lower than for perennial species both in dicotyledons and monocotyledons. Ephemeral species have a significantly lower mean nuclear DNA content than annual species. Among perennial monocotyledons the mean nuclear DNA content of species which can complete a life cycle within one year (facultative perennials) is significantly lower than the mean nuclear DNA content of those which cannot (obligate perennials). However, the mean nuclear DNA content of facultative perennials does not differ significantly from the mean for annual species. It is suggested that the effects of nuclear DNA content on the duration of developmental processes are most obvious during its determinant stages, and that the largest effects of nuclear DNA mass are expressed at times when development is slowest, for instance, during meiosis or at low temperature. It has been suggested that DNA influences development in two ways, directly through its informational content, and indirectly by the physical-mechanical effects of its mass. The term 'nucleotype' is used to describe those conditions of the nucleus which effect the phenotype independently of the informational content of the DNA. It is suggested that cell cycle time, meiotic duration, and minimum generation time are determined by the nucleotype. In addition, it may be that satellite DNA is significant in its nucleotypic effects on developmental processes.

scholarly journals Prognostic Value of Cell Cycle Proteins in Squamous Cell Carcinomas of the Oral Cavity

2011 ◽  
Vol 02 (03) ◽  
Author(s):  
Marcilei Eliza Ca vicchioli Buim ◽  
José Humberto Fregnani ◽  
Silvia Vanessa Lourenço ◽  
Cibele Pidorodeski Nagano
Keyword(s):  
Cell Cycle ◽  
Oral Cavity ◽  
Squamous Cell ◽  
Prognostic Value ◽  
Squamous Cell Carcinomas ◽  
Cell Cycle Proteins

scholarly journals Presence of Human Papillomavirus and Epstein–Barr Virus, but Absence of Merkel Cell Polyomavirus, in Head and Neck Cancer of Non-Smokers and Non-Drinkers

2021 ◽  
Vol 10 ◽  
Author(s):  
Frans J. Mulder ◽  
Faisal Klufah ◽  
Famke M. E. Janssen ◽  
Farzaneh Farshadpour ◽  
Stefan M. Willems ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Human Papillomavirus ◽  
Head And Neck ◽  
Epstein Barr Virus ◽  
Merkel Cell Polyomavirus ◽  
Merkel Cell ◽  
Cell Cycle Proteins ◽  
P53 Expression ◽  
Barr Virus ◽  
Epstein Barr

ObjectiveDetermine the presence and prognostic value of human papillomavirus (HPV), Epstein-Barr virus (EBV), Merkel cell polyomavirus (MCPyV), and cell cycle proteins in head and neck squamous cell carcinoma (HNSCC) of non-smokers and non-drinkers (NSND).MethodsClinical characteristics and tumors of 119 NSND with HNSCC were retrospectively collected and analyzed on tissue microarrays. RNAscope in situ hybridization (ISH) was used to screen for the presence of HPV and MCPyV mRNA. Immunohistochemistry was performed for expression of p16 as surrogate marker for HPV, Large T-antigen for MCPyV, and cell cycle proteins p53 and pRb. Positive virus results were confirmed with polymerase chain reaction. For EBV, EBV encoded RNA ISH was performed. Differences in 5-year survival between virus positive and negative tumors were determined by log rank analysis.ResultsAll oropharyngeal tumors (OPSCC) (n = 10) were HPV-positive, in addition to one oral (OSCC) and one nasopharyngeal tumor (NPSCC). The other three NPSCC were EBV-positive. MCPyV was not detected. Patients with HPV or EBV positive tumors did not have a significantly better 5-year disease free or overall survival. Over 70% of virus negative OSCC showed mutant-type p53 expression.ConclusionIn this cohort, all OPSCC and NPSCC showed HPV or EBV presence. Besides one OSCC, all other oral (n = 94), hypopharyngeal (n = 1), and laryngeal (n = 9) tumors were HPV, EBV, and MCPyV negative. This argues against a central role of these viruses in the ethiopathogenesis of tumors outside the oro- and nasopharynx in NSND. So, for the majority of NSND with virus negative OSCC, more research is needed to understand the carcinogenic mechanisms in order to consider targeted therapeutic options.

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