Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0027651 (tumor)
 685,946 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Two cases of hepatic lymphangiomatosis were examined. One tumor was noted incidentally at autopsy, and the other tumor was removed by operation. These liver tumors could not be detected by the naked eye, but ill-defined lace-like areas were seen. Microscopically, small cystic spaces were irregularly aggregated in the hepatic parenchyma and, in part, in the portal tracts. Faintly stained lymph-like material without any erythrocytes was found in the spaces. The silver impregnation method confirmed that most of the cystic lumina were dilated Disse's spaces. Also, some of them were directly connected with lymph vessels in the portal tracts. Thin lining cells along the internal surface of these cystic channels could not be positively stained by Ulex europaens 1 or factor 8-related antigen, both of which were present in the endothelium of the blood vessels in the portal tracts. We describe herein this rare lymphangiomatosis of the liver, with special reference to its immunohistochemistry.
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PMID:Hepatic lymphangiomatosis: report of two cases, with an immunohistochemical study. 161 49

In the present study, we have investigated the expression of both the erythrocyte-type (GLUT1) and the brain-type (GLUT3) glucose transporter isoforms in primary human brain tumors. In situ hybridization made it possible to localize and semiquantify both GLUT1 and GLUT3 mRNAs of individual cells in all 18 samples examined. More signals for GLUT3 mRNA than for GLUT1 mRNA were found over astrocytoma cells, while the reverse was the case in all 6 meningiomas. In astrocytomas, for both mRNAs, the density of silver grains over tumor cells was well correlated with the malignancy of the cells. This correlation was, as was also confirmed by Northern blot analysis, more marked with GLUT3 mRNA than with GLUT1 mRNA. In 2 of 5 anaplastic astrocytomas and in all 3 glioblastomas, numerous tumor cells with large amounts of both mRNAs tended to surround the perivascular regions. "Tumor vessels" with endothelial proliferation, an almost pathognomonic feature of glioblastomas, expressed much GLUT3 mRNA but no significant GLUT1 mRNA, while a single- or a few-layered capillary endothelium expressed much GLUT1 mRNA. The distribution of both mRNAs was in good accordance with that of both proteins. Our results suggest that the expression of both glucose transporter isoforms may contribute to the maintenance of human brain tumors and that the expression of the GLUT3 isoform may be closely related to the malignant change of astrocytomas and particularly related to the aberrant neovascularization which accompanies glioblastomas.
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PMID:Distribution of the glucose transporters in human brain tumors. 161 73

A 65-year-old man who died of respiratory failure due to malignant hemangioendothelioma is reported. He was admitted to our hospital because of intractable hemoptysis. Chest roentgenogram revealed multiple patchy shadows in both lungs, but we could not make a diagnosis by usual clinical examinations including transbronchial lung biopsy. Since the patient's condition became critical, oxygen therapy, anticoagulants and antibiotics were started. In addition, corticosteroid therapy and double filtration plasmapheresis were performed since immunological disorder was suspected because of positive immunological examinations such as antinuclear antibodies and an increase in circulatory immune complexes. There was little response to the treatments and the patient finally died of respiratory failure. At autopsy, multiple tumor nodules were found throughout the lungs and the liver. Metastasis to mediastinal lymph nodes was also discovered. These findings made it impossible to confirm the primary lesion. Microscopy showed proliferation of anastomosing capillaries encasing tumor cells of unknown origin. Silver staining demonstrated capillaries encompassing the atypical cells, suggesting a vascular origin of the tumor. Furthermore, factor VIII related-antigen in the tumor cells was confirmed by the peroxidase-antiperoxidase (PAP) method. The final diagnosis of malignant hemangioendothelioma was made from these histological findings. Malignant hemangioendothelioma is rare, but is an important cause of intractable hemoptysis.
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PMID:[A case of intractable hemoptysis due to malignant hemangioendothelioma]. 162 87

This study was designed for the purpose of investigating a method for in vivo tumor labelling of human GH (hGH) secreting pituitary adenomas. Pituitary adenoma tissue removed from four acromegalic patients was transplanted into 62 athymic nude mice. After positive GHRH stimulation tests 125I-GHRH(1-44) NH2 was injected intravenously (i.v.) in ten nude mice. 10 min after 125I-GHRH injection, the nude mice were sacrificed, the transplants excised and prepared for light microscopical autoradiography. The mouse pituitary and skeletal muscle specimens served as controls. After the i.v. injection of 125I-GHRH we observed a marked accumulation of silver grains within the adenoma tissue indicating tumor labelling. This study is a first step in investigating a new method for labelling small residues of hGH secreting pituitary adenomas intraoperatively.
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PMID:Autoradiographic demonstration of in vivo 125I-growth hormone-releasing hormone (GHRH) binding by human GH-secreting pituitary adenomas transplanted on athymic nude mice. 163 14

Serial sections of the conus medullaris and the filum terminale of 23 randomly selected human spinal cords were studied by light and electron microscopy, and following immunoperoxidase staining for glial fibrillary acidic protein (GFAP), vimentin, neuron-specific enolase (NSE), amyloid beta protein, and S-100 protein. The intradural portion of the filum contains bundles of GFAP-positive glial fibers, scattered silver- and NSE-positive neurons, segments of peripheral nerve, blood vessels, fibrous connective tissue, and fat. Glial cell clusters varying from five to 100 cell layers thick at times constitute the bulk of the filum. The periependymal glial cells possess moderate amounts of eosinophilic cytoplasm and relatively uniform round to ovoid nuclei containing evenly distributed chromatin. They are distributed diffusely with no specific pattern of organization, although some of them showed a tendency to form acinar structures. A minority of the glial cells showed GFAP immunoreactivity, and some were immunoreactive for vimentin. Electron microscopy demonstrated the presence of periependymal cells showing cilia, microvilli, and the formation of intercellular junctional complexes, as well as cells containing bundles of glial filaments within the cytoplasm. Degenerated NSE-positive neurons and degenerated neurites resembling neuritic plaques were also demonstrated. However, immunoperoxidase staining for amyloid beta protein was negative in these structures. Thus, the filum terminale is endowed with an abundance of glial cells and neurons and is not simply a fibrovascular tag. Periependymal glial cells in the filum terminale should not be mistaken for neoplasm. The presence of neuropil with profuse astroglial and neuronal components within the filum terminale suggests a possible functional role for these structures.
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PMID:The ventriculus terminalis and filum terminale of the human spinal cord. 164 36

The argyrophilic nucleolar organizer regions (AgNORs) have been extensively investigated in different neoplasms, and their increased number has been frequently linked to aggressive tumor behavior. To evaluate this association, 22 specimens from 21 patients with Wilms' tumors and related lesions were stained by the AgNOR silver-staining technique in formalin-fixed, paraffin-embedded tissue. The aim of the study was to assess the significance of AgNOR count independently or in relation to histology in predicting the behavior of these neoplasms. Eleven nonneoplastic pediatric kidneys were used as controls. The controls had a range of 1.55 to 2.26 AgNOR/nucleus with a mean +/- SD of 1.91 +/- 0.22. The tumors showed a range of 1.25 to 2.86 AgNOR/nucleus with a mean +/- SD of 2.10 +/- 0.38 with obvious overlap between tumors and controls. The two unfavorable histology Wilms' tumors and the malignant rhabdoid tumor showed no increase in the number of AgNOR (1.66, 2.04, and 2.05, respectively). We further quantitated the nucleolar organizer regions (NOR) in metaphase spreads of three of the neoplasms, compared those with the patients' peripheral blood, and showed no difference in NOR numbers except for an occasional decrease in G-group NORs in the tumor cells. Tumors that had metaphase NOR counts of 6 to 9/nucleus had a mean interphase AgNOR count of less than 2.5. These results suggest that quantitative analysis of AgNORs in Wilms' tumors and related lesions is not a reliable predictor of aggressive tumor behavior. The discrepancy between metaphase and interphase NOR counts indicates that AgNOR counts are merely the reflection of the spatial arrangement of NOR-bearing chromosomes.
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PMID:Argyrophilic nucleolar organizer regions in Wilms' tumors and related lesions: a histologic and chromosomal correlation. 164 58

Ferritin in 119 astrocytoma cases was studied by immunocytochemical PAP and immunogold silver staining (IGSS) methods. In 57% of the cases, ferritin was found in the cytoplasm of the tumor cells. The higher the differentiation of the tumor cells, the less ferritin they contained. Contrary to the reaction of glial fibrillary acidic protein (GFAP), the positive rate of ferritin in various types and grades of astrocytomas was inversely proportional to their degree of differentiation. Electron microscopic observation in 30 cases showed ferritin in the cell sap, cytocavity network, endoplasmic reticulum, Golgi apparatus and also in lysosomes. Some of the cases had extraordinary high level of ferritin in their blood serum.
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PMID:Ferritin in astrocytomas. 164 65

A growth factor-stimulated protein kinase activity that phosphorylates the epidermal growth factor (EGF) receptor at Thr669 has been described (Countaway, J. L., Northwood, I. C., and Davis, R. J. (1989) J. Biol. Chem. 264, 10828-10835). Anion-exchange chromatography demonstrated that this protein kinase activity was accounted for by two enzymes. The first peak of activity eluted from the column corresponded to the microtubule-associated protein 2 (MAP2) kinase. However, the second peak of activity was found to be a distinct enzyme. We present here the purification of this enzyme from human tumor KB cells by sequential ion-exchange chromatography. The isolated protein kinase was identified as a 46-kDa protein by polyacrylamide gel electrophoresis and silver staining. Gel filtration chromatography demonstrated that the enzyme was functional in a monomeric state. A kinetic analysis of the purified enzyme was performed at 22 degrees C using a synthetic peptide substrate based on the primary sequence of the EGF receptor (KREL VEPLT669PSGEAPNQALLR). The Km(app) for ATP was 40 +/- 5 microM (mean +/- S.D., n = 3). GTP was not found to be a substrate for the purified enzyme. The Km(app) for the synthetic peptide substrate was 260 +/- 40 microM (mean +/- S.D., n = 3). The Vmax(app) for the isolated protein kinase was determined to be 400-900 nmol/mg/min. The purified enzyme was designated EGF receptor Thr669 (ERT) kinase. It is likely that the MAP2 and ERT kinases account for the phosphorylation of the EGF receptor at Thr669 observed in cultured cells. The marked stimulation of protein kinase activity caused by growth factors indicates that these enzymes may have an important function during signal transduction.
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PMID:Isolation and characterization of two growth factor-stimulated protein kinases that phosphorylate the epidermal growth factor receptor at threonine 669. 165 22

The proliferative potential of two types of tumor cells that did or did not express glial fibrillary acidic protein (GFAP) in 19 cases of high-grade gliomas, including nine anaplastic astrocytomas (WHO criteria, grade 3) and 10 glioblastoma multiforme (grade 4), was investigated by a combined staining technique, one-step silver colloid method for nucleolar organizer region-associated argyrophilic protein (Ag-NOR) and immunocytochemistry for GFAP. The mean numbers of Ag-NORs in GFAP-positive cells and GFAP-negative cells of high-grade gliomas were 2.68 and 3.74, respectively. The value of GFAP-negative cells was significantly greater than that of GFAP-positive cells (p less than 0.01). Our results show that, by means of the immunocytochemistry for GFAP, tumor cells in human high-grade gliomas can be divided into two groups expressing GFAP or not, and that the mean number of Ag-NORs of GFAP-negative cells is more representative of the degree of histological malignancy than that of positive cells. It is considered that the proliferative assessment of GFAP-negative tumor cells in high-grade gliomas by combined staining of Ag-NOR silver staining and GFAP immunocytochemistry is useful for understanding the histological malignancy of high-grade gliomas.
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PMID:Proliferative assessment of GFAP-positive and GFAP-negative glioma cells by nucleolar organizer region staining. 165 62

Necropsy examination of a control Sprague-Dawley male rat from a carcinogenicity study disclosed the presence of a neoplastic mass in the trachea. Microscopic examination disclosed that the tumor consisted of closely packed cells arranged in lobules and cords separated by thin connective tissue stroma. The cells had distinct cell borders and abundant pale cytoplasm. Electron microscopic examination further disclosed that the cytoplasm contained numerous argyrophilic neurosecretory granules measuring 298 nm in diameter. These granules were positive for Grimelius silver stain. The histopathologic and electron microscopic features of this tumor are consistent with a diagnosis of clear-cell carcinoma.
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PMID:Clear-cell carcinoma in the trachea of a rat. 165 67


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