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  • 1
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature medicine 12 (2006), S. 1231-1231 
    ISSN: 1546-170X
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Medizin
    Notizen: [Auszug] To the editor: After reading the article by Topczewska et al. implicating the role of the embryonic morphogen Nodal in melanoma pathogenesis, which I found to be extremely interesting, I was struck by the lack of scientific and historical perspective displayed by the authors. In particular, there ...
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 264 (1976), S. 174-177 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Embryos were obtained from day 14 pregnant A/J or C57 mice (purchased timed pregnant from Jackson Laboratories and obtained on day 11 of pregnancy). Embryos were dissected from the uteri in phosphate-buffered saline (PBS). Placentae and other extraembryonic membranes were removed, and the embryos ...
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Archives of dermatological research 269 (1980), S. 111-126 
    ISSN: 1432-069X
    Schlagwort(e): Dermal fibroblasts ; Glucocorticoids ; Receptors ; Growth ; Dermale Fibroblasten ; Glukokorticoide ; Receptoren ; Wachstum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Es wurden Primärkulturen dermaler Fibroblasten aus neugeborenen Mäusen verwandt, um einige der entzündungshemmenden Wirkungen der Glukocorticoide in vitro unter dem Einfluß des genetischen Hintergrunds zweier verschiedener Mäusestämme (A/J und C57B1/6J) zu untersuchen. Fibroblasten wurden 2-7 Tage lang mit und ohne verschiedene Glukocorticoide kultiviert. Unter Steroiden-4-7 Tage lang — wurde die DNA-Synthese um 50–85% und die Eiweißsynthese um 50–60% gehemmt. Corticosteron verursachte in diesen Zellen eine dosisabhängige Hemmung der DNA-Synthese, wobei eine 50%-Reduzierung bei 10 nM eintrat. Spezifisches Eiweiß mit hoher Affinität und niedriger Kapazität für [3H]-Dexamethasonbzw. [3H]-Triamzinolon-Acetonid wurde im Cytoplasma von Dermalfibroblasten offenbar mit einem Kd von 9 nM und ca. 5200–6400 Bindestellen/Zelle aufgefunden. Die Sedimentationsanalyse des [3H]-Triamzinolon-Acetonid-Receptorenkomplexes wies bei niedrigen Salzglyceringefällen eine Bindung in der 7-8S-Region auf. Diese Untersuchungen weisen darauf hin, daß die Wachstumshemmung von Primärkulturen dermaler Fibroblasten neugeborener Mäuse durch Glukocorticoide wahrscheinlich auf receptoren vermitteltem Wege stattfindet und daß dieses Primärkulturensystem zur Abgrenzung anderer entzündungshemmender Wirkungen, von Glukocorticoiden in vitro nützlich sein dürfte.
    Notizen: Summary Primary cultures of dermal fibroblasts from neonatal mice were used to investigate some of the anti-inflammatory effects of glucocorticoids in vitro as influenced by the genetic background of two different strains of mice (A/J and C57 B1/6J). Fibroblasts were cultured in the absence or presence of various glucocorticoids for 2–7 days. After 4–7 days in the presence of steroid, DNA synthesis was reduced by 50–85% while protein synthesis was inhibited by 50–60%. Corticosterone produced a dose-dependent inhibition of DNA synthesis in these cells with a 50% reduction occurring at 10 nM. Specific, high affinity, low capacity binding proteins for [3H]dexamethasone or [3H]triamcinolone acetonide were identified in the cytoplasm of neonatal dermal fibroblasts which had an apparent Kd of 9 nM and ∼5,200–6,400 binding sites/cell. Sedimentation analysis of the [3H]triamcinolone acetonide-receptor complexes on low salt glycerol gradients exhibited binding in the 7 to 8 S region of the gradients. These studies demonstrate that inhibition of growth of primary cultures of mouse neonatal dermal fibroblasts by glucocorticoids is probably mediated by a receptor-mediated pathway, and that this primary culture system might be useful in delineating other anti-inflammatory effects of glucocorticoids in vitro.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Journal of mammary gland biology and neoplasia 2 (1997), S. 199-199 
    ISSN: 1573-7039
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Breast cancer research and treatment 33 (1995), S. 103-114 
    ISSN: 1573-7217
    Schlagwort(e): amphiregulin ; breast tumors ; EGF receptor ; oncogenes ; steroid hormones ; transformation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Amphiregulin (AR) is an epidermal growth factor (EGF)-related peptide that operates exclusively through the EGF receptor and that can bind to heparin. AR also possesses nuclear localization sequences in the extended NH2-terminal region suggesting an additional intracellular site of action. AR mRNA and protein expression have been detected in primary human mammary epithelial cell strains, nontransformed human mammary epithelial cell lines, several human breast cancer cell lines, and primary human breast carcinomas. The frequency and levels of AR protein expression are generally higher in invasive breast carcinomas than in ductal carcinomasin situ or in normal, noninvolved mammary epithelium. In addition, AR can function as an autocrine and/or juxtacrine growth factor in human mammary epithelial cells that have been transformed by an activated c-Ha-ras proto-oncogene or by overexpression of c-erb B-2. AR expression is also enhanced by mammotrophic hormones such as estrogens and other growth factors such as EGF.
    Materialart: Digitale Medien
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  • 6
    ISSN: 1573-7217
    Schlagwort(e): αTGFs ; breast cancer cells ; estrogen ; estrogen receptor ; p21ras protein ; radioimmunoassay
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Alpha transforming growth factors (αTGFs) were immunologically detected in the concentrated conditioned medium (CM) prepared from four human breast cancer cell lines and from primary cultures of human mammary epithelial cells, and in the tissue extracts prepared from normal, benign, and malignant breast biopsies. Immunoreactive αTGFs were quantitated by a competitive radioimmunoassay (RIA) using affinity-purified polyclonal sheep anti-rat αTGF antibodies which react with human αTGF but not with human epidermal growth factor (EGF). The relative level of RIA-detectable αTGFs in the CM from the breast cancer cell lines MCF-7, ZR-75-1, T47-D, and MDA-MB-231, and from the CM of primary cultures of human mammary epithelial cells, ranged from 0.02 to 0.85 ng/ml. MCF-7 or ZR-75-1 cells grown in the presence of 17β-estradiol (10−8 M) for 48 h were found to release two- to three-fold more αTGFs into their CM than the same cells grown in the absence of estrogen. In detergent extracts prepared from normal breast tissue, a benign fibrocystic lesion, fibroadenomas and primary breast carcinomas, the relative αTGF concentrations were found to range from 1.5 to 6 ng/mg cell protein. No significant correlations were found between the αTGF levels and the pathological state of the tissues, the estrogen receptor status of the tumors, or the relative amounts of theras gene protein p21ras in the tissues as determined by Western immunoblot analysis. The question of biological relevancy of αTGF for human mammary tumors will require further studies on (a) synthesis and turnover of αTGF, (b) the relationship between immunoreactivity and biological activity of αTGF, and (c) differences in biological responsiveness of mammary tumor cells.
    Materialart: Digitale Medien
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  • 7
    ISSN: 1573-7217
    Schlagwort(e): breast cancer ; amphiregulin ; heregulin ; cripto-1 ; EGF receptor family
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The expression of amphiregulin (AR), heregulin (HRG), and cripto-1 (CR-1) mRNA transcripts was assessed in 60 human primary breast carcinoma. AR and HRG transcripts were expressed respectively in 58% and 25% of the carcinomas as measured by Northern blot analysis. CR-1 mRNA was found in 77% of the carcinomas using Reverse Transcriptase-PCR analysis. Coexpression of two or three of these peptides was observed in several specimens. There was no significant association between AR, HRG, and CR-1 expression and nodal status, EGF receptor, or c-erbB-2 protooncogene expression in these tumors. However, a significant association between AR expression and estrogen receptor positivity was observed.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Breast cancer research and treatment 58 (1999), S. 183-186 
    ISSN: 1573-7217
    Schlagwort(e): xenograft model ; preneoplasia ; MCF10AT
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A workshop on the ‘Research potential of a unique xenograft model of human proliferative breast disease’ was held at the Karmanos Cancer Institute, Wayne State University, Detroit, Michigan, in November of 1998. The accumulated information and current experimental findings on the MCF10AT model of preneoplastic, proliferative breast disease were reviewed. Discussions focused on the relevance of the model to clinical breast cancer and on the most profitable lines of further research to strengthen its utility.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Breast cancer research and treatment 12 (1988), S. 159-166 
    ISSN: 1573-7217
    Schlagwort(e): growth factors ; TGF's ; EGF ; autocrine ; paracrine ; stromal cells ; tumor markers ; receptors ; oncogenes ; prognostic indicators ; breast cancer therapy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 97 (1978), S. 315-327 
    ISSN: 0021-9541
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The growth of primary embryonic facial mesenchyme cells established from cleft palate sensitive A/J and resistant C57BL/6J (C57) mice is inhibited by glucocorticoid treatment. A reduction in cell number in both A/J and C57 culture is accompanied by a significant decrease in [3H] thymidine incorporation into both acid soluble and insoluble material. No significant changes in total cellular protein or [14C] leucine incorporation were observed in either cell type. A greater reduction in [3H] thymidine incorporation occurs in cells undergoing exponential growth following steroid exposure than in cells approaching stationary growth. In both A/J and C57 cultures the reduction in cell number exhibits a dose-dependent response to dexamethasone; is specific for glucocorticoids; and is dependent upon the concentration of serum in which the cells are maintained. A/J cells show a greater sensitivity to the inhibitory effect of dexamethasone on cell number and thymidine incorporation than comparably treated C57 cells. Specific, high affinity, saturable cytoplasmic receptors for [3H] dexamethasone are present in the maxillary cytosols from which the primary cultures were established. These receptors exhibit binding specificity for glucocorticoids, and have properties which are similar to glucocorticoid receptors identified in other systems. In both cell types, a correlation exists between the degree of growth inhibition or reduction of [3H] thymidine incorporation and the level of glucocorticoid receptors. These results provide evidence for a receptor-mediated set of responses to glucocorticoids in these cells.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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