Search results for "Cell Nucleus"
showing 10 items of 379 documents
Notch signalling is off and is uncoupled from HES1 expression in Ewing's sarcoma
2010
Notch can act as an oncogene or as a tumour suppressor and thus can either promote or inhibit tumour cell growth. To establish Notch status in Ewing's sarcoma family of tumours (ESFT), we investigated the Notch pathway by gene expression profiling meta-analysis or immunohistochemistry in samples obtained from 96 and 24 ESFT patients, respectively. We found that although Notch receptors were highly expressed, Notch did not appear to be active, as evidenced by the absence of Notch receptors in cell nuclei. In contrast, we show that Notch receptors known to be active in colon adenocarcinoma, hepatocarcinoma, and pancreatic carcinoma stain cell nuclei in these tumours. High expression of the No…
Value of insoluble PABPN1 accumulation in the diagnosis of oculopharyngeal muscular dystrophy.
2019
Background and purpose The aim was to assess the value of insoluble PABPN1 muscle fibre nuclei accumulation in the diagnosis of atypical cases of oculopharyngeal muscular dystrophy (OPMD). Methods Muscle biopsies from a selected cohort of 423 adult patients from several Italian neuromuscular centres were analysed by immunofluorescence: 30 muscle biopsies of genetically proven OPMD, 30 biopsies from patients not affected by neuromuscular disorders, 220 from genetically undiagnosed patients presenting ptosis or swallowing disturbances, progressive lower proximal weakness and/or isolated rimmed vacuoles at muscle biopsy and 143 muscle biopsies of patients affected by other neuromuscular diseas…
Cytokeratin 8 immunostaining pattern and E-cadherin expression distinguish lobular from ductal breast carcinoma.
2000
Immunohistochemistry using antibodies to cytokeratin 8 can serve as a valuable diagnostic tool for the differentiation of lobular from ductal carcinomas of the breast. In contrast with ductal carcinomas, which exhibit a peripheral-predominant immunostaining pattern, adjacent tumor cells “molding” to each other, lobular carcinomas exhibit a ring-like perinuclear immunostaining pattern, creating a “bag of marbles” appearance with neighboring tumor cells. This immunostaining pattern is stable even in the tumors that otherwise do not exhibit characteristic histomorphologic features (ie, solid or pleomorphic type of a lobular carcinoma) and tumors that mimic growth patterns characteristic of the…
Usefulness of immunohistochemical staining for p53 in the prognosis of breast carcinomas: correlations with established prognosis parameters and with…
1995
Mutations of the p53 gene often result in the overexpression of p53 protein. Previous studies have suggested that the function of p53 and its mutant protein forms may be linked with the disease course of patients with a breast carcinoma. In the present study, we tested 462 primary breast carcinomas for the presence of p53 antigen using immunohistochemical methods employing antibodies against the clone, DO-1. These tumors were also immunohistochemically stained using the monoclonal antibody, MIB-1, in order to demonstrate the presence of Ki67. Comparison of the presence of p53 with other prognostic parameters revealed highly significant negative correlations with estrogen- and progesterone-r…
Neurochemical and morphological studies on demyelination in multiple sclerosis with special reference to etiological aspects.
1972
Light microscopic studies were used as control for neurochemical studies and these showed that some micro plaques could be found also in areas which were normal on visual inspection. Also foreign cell infiltrates were found outside any clear plaque material. The number of these cells did not correlate with other findings like lipid or enzyme chemistry. In electronmicroscopic studies astrocytes demonstrated most lysosomes and phagocytosis of myelin. This increased lysosomal reaction was demonstrated also in biochemical analyses performed on MS biopsy specimens. Occasional nuclear changes like inclusion bodies and protrusion of inner nuclear membrane were observed suggesting some exogenous, p…
Comparative study of T84 and T84SF human colon carcinoma cells: in vitro and in vivo ultrastructural and functional characterization of cell culture …
2005
To better understand the relationship between tumor heterogeneity, differentiation, and metastasis, suitable experimental models permitting in vitro and in vivo studies are necessary. A new variant cell line (T84SF) exhibiting an altered phenotype was recently selected from a colon cancer cell line (T84) by repetitive plating on TNF-alpha treated human endothelial cells and subsequent selection for adherent cells. The matched pair of cell lines provides a useful system to investigate the extravasation step of the metastatic cascade. Since analysis of morphological differences can be instructive to the understanding of metastatic potential of tumor cells, we compared the ultrastructural and …
<title>Multiparameter breast cancer cell image analysis for objective estimation of nuclear grade: comparison with light microscopic observatio…
2000
We performed a multi parameter image analysis assessment of breast cancer cell population nuclear grade (NG), which is regarded as one of the main prognostic factors for treatment efficacy and survival of the patients and compared it with light microscopic estimation of NG. Cytological imprint slides from 20 ductal carcinomas were stained according to Leischmann-AzureII-eosine method, and NG was estimated by light microscopic observation according to Black in Fisher's modification. Simultaneously, using specially elaborated software, in each patient 100 cancer cells were analyzed for nuclear perimeter, diameter, area, nucleolar area, and average intensity of staining. The chromatin structur…
Granular nuclear inclusion body disease: Fine structure of tibial muscle and sural nerve
1985
Fine granular (hyaline) intranuclear inclusion bodies were found in perivascular cells of a muscle and a sural nerve biopsy from a 32-year-old woman with slowly progressive motor disturbances. The hyaline nuclear inclusion bodies could be distinguished from other intranuclear hyaline inclusions by their granularity, the size of the granules (approximately 5-15 nm), and the positive iron staining reaction. They were not seen in muscle fibers or Schwann cells. Because of these apparently pathognomonic structural features the patient appears to present a condition that has not been described before.
Bestimmung von Glykolyse-Metaboliten in isolierten Zellkernen
1958
Isolated rat liver nuclei have been analyzed for the intranuclear concentration of 8 glycolytic metabolites, and in addition for the 3 adenine nucleotides, and for malate. All these substrates are to be found in nuclei in a range of concentration comparable to that in the whole tissue. The consequences of these findings with respect to the definite establishment of glycolysis in isolated nuclei, as well as for the intranuclear formation of energy-rich phosphate bonds, are discussed.
Phosphoribomutase- und 5-Phosphoriboisomerase-Aktivität in isolierten Zellkernen
1958
The existence of phosphoribomutase and 5-phosphoriboisomerase has been demonstrated in isolated cellular nuclei from rat liver and swine kidney. Phosphoribomutase has been shown to require Mg-ions for optimal activity.