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  • 1
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] We recently isolated a Krüppel-like zinc-finger transcription factor 5 (KLF5; also known as BTEB2 and IKLF), which is markedly induced in activated vascular smooth-muscle cells and fibroblasts. Here we describe our analysis of the in vivo function of KLF5 using heterozygous KLF5-knockout mice ...
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0533
    Keywords: Peanut agglutinin ; Prolactin ; Pituitary adenomas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Peanut agglutinin (PNA)-binding sites in human prolactin (PRL)-producing pituitary adenomas were examined by light and electron microscopy together with immunoblot analysis. At the light microscopic level, the majority of the PRL-producing adenoma cells stained positively for PNA in 15 of 20 cases. PNA binding observed in the cytoplasm had a granular appearance. PRL-producing cells adjacent to the adenoma tissue showed negative PNA staining. In normal pituitary glands, the PRL-positive glandular cells were negative for PNA staining. By electron microscopy, reaction products showing PNA-binding sites were detected in some of the secretory granules. Immunoblotting analysis revealed that the PRL bands corresponded to PNA-stained ones with the exception of the main 23-kDa band. PNA-binding sites have some relation to the secretory granules containing glycosylated forms of PRL. These observations suggest that PNA staining can be used as a valuable method to analyze human PRL-producing pituitary adenomas.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0533
    Keywords: Key words Peanut agglutinin ; Prolactin ; Pituitary ; adenomas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Peanut agglutinin (PNA)-binding sites in human prolactin (PRL)-producing pituitary adenomas were examined by light and electron microscopy together with immunoblot analysis. At the light microscopic level, the majority of the PRL-producing adenoma cells stained positively for PNA in 15 of 20 cases. PNA binding observed in the cytoplasm had a granular appearance. PRL-producing cells adjacent to the adenoma tissue showed negative PNA staining. In normal pituitary glands, the PRL-positive glandular cells were negative for PNA staining. By electron microscopy, reaction products showing PNA-binding sites were detected in some of the secretory granules. Immunoblotting analysis revealed that the PRL bands corresponded to PNA-stained ones with the exception of the main 23-kDa band. PNA-binding sites have some relation to the secretory granules containing glycosylated forms of PRL. These observations suggest that PNA staining can be used as a valuable method to analyze human PRL-producing pituitary adenomas.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Clinical & experimental metastasis 12 (1994), S. 129-133 
    ISSN: 1573-7276
    Keywords: colon carcinoma ; immunohistochemistry ; Lewisx ; liver metastasis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Immunohistochemical aspects of the process of experimentally induced metastasis were examined by light and electron microscopy employing a series of labeled carbohydrate-specific monoclonal antibodies as probes. Liver metastasis was induced by injecting mouse colon carcinoma cell (colon 26) into the spleen of Balb/c mice. Labeled anti-Lewisx (Lex) antibody stained the metastasized colon 26 cells strongly compared with the heterogeneous and faint staining in non-metastasized tumor foci in the spleen or in the subcutaneous space. Other antibodies having specificities for Lewis-related antigens other than Lex, e.g. those against Ley, Lea, Leb, sialyl Lex and sialyl Lea, did not show any differences in binding between metastasized cells and non-metastasized tumor foci. Immunoelectron microscopy revealed the expression of Lex-carbohydrate in the plasma membranes as well as in the intercellular spaces of metastasized colon 26 cells in the liver. Based on these results, it is likely that sugar chains containing the Lex-carbohydrate structure are involved in the interactions between colon 26 cells and hepatic cells during the process of liver metastasis.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1860-1499
    Keywords: Uterine cervical cancer ; Squamous epithelium ; Blood group A type 3 chain ; Immunoelectron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A monoclonal antibody, MRG-1, was established by use of a human ovarian mucinous cyst-adenocarcinoma-derived cell line, RMUG-L, as immunogen. Following its establishment, biochemical analysis revealed that its epitope was blood group A type 3 chain. Using MRG-1 as an immunohistochemical probe, uterine cervical neoplastic lesions including dysplasia, carcinomain situ, and invasive carcinoma were investigated. Light-microscopically, normal squamous epithelium showed a strong positive reaction along the cell surface region exclusively in the intermediate cell layer. On the other hand, intracellular structures were very often strongly stained in squamous cell carcinoma. Under the electron microscope, MRG-1 binding sites in squamous cell carcinoma cells were found to be in intracytoplasmic vesicular structures as well as in the plasma membrane. This marked difference in the antigen distribution was found to be a phenomenon associated with cervical neoplastic transformation.
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  • 6
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The effect of tunicamycin (TM) on testicular cord organization in the fetal mouse was examined in vitro at light and electron microscopic levels, with special reference to the glycoprotein functions during Sertoli cell differentiation.In testicular explants treated with TM, testicular cord organization was inhibited. TM treatment affected basal lamina formation by Sertoli cells, resulting in a discontinuous basal lamina or none at all in certain areas. The disorganized Sertoli cells were amorphous in shape, exhibited poor epithelial polarity, and were irregularly arranged in the testicular parenchyma. Extracellular matrix and collagen fibers were often observed in the intercellular spaces between the disorganized Sertoli cells. Lectin histochemical observation revealed that the number of wheat germ agglutinin binding sites on the plasma membrane and basal lamina of disorganized Sertoli cells was significantly decreased by TM treatment. However, junctions were normally observed in the plasma membrane between disorganized Sertoli cells. Leydig cells showed a normal differentiation in the testicular parenchyma in the presence of TM.These observations suggest that basal lamina formation of Sertoli cells and/or the expression of their cell surface glycoconjugates may be crucial for the establishment of Sertoli cell polarity and/or the Sertoli-Sertoli cell interactions required for proper testicular cord formation. Sertoli cell organization into testicular cords and Leydig cell differentiation may be controlled by different regulatory mechanisms.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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